1 | /* Copyright (c) 2006-2010 by OpenLayers Contributors (see authors.txt for |
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2 | * full list of contributors). Published under the Clear BSD license. |
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3 | * See http://svn.openlayers.org/trunk/openlayers/license.txt for the |
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4 | * full text of the license. */ |
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5 | |
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6 | /** |
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7 | * @requires OpenLayers/Control.js |
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8 | * @requires OpenLayers/Layer/WMS/Post.js |
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9 | * @requires OpenLayers/Handler/RegularPolygon.js |
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10 | * @requires OpenLayers/Handler/Polygon.js |
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11 | * @requires OpenLayers/Handler/Path.js |
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12 | * @requires OpenLayers/Handler/Click.js |
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13 | * @requires OpenLayers/Filter/Spatial.js |
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14 | */ |
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15 | |
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16 | /** |
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17 | * Class: OpenLayers.Control.SLDSelect |
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18 | * Perform selections on WMS layers using Styled Layer Descriptor (SLD) |
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19 | * |
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20 | * Inherits from: |
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21 | * - <OpenLayers.Control> |
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22 | */ |
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23 | OpenLayers.Control.SLDSelect = OpenLayers.Class(OpenLayers.Control, { |
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24 | |
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25 | /** |
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26 | * Constant: EVENT_TYPES |
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27 | * {Array(String)} Supported application event types. Register a listener |
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28 | * for a particular event with the following syntax: |
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29 | * (code) |
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30 | * control.events.register(type, obj, listener); |
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31 | * (end) |
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32 | * |
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33 | * Listeners will be called with a reference to an event object. The |
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34 | * properties of this event depends on exactly what happened. |
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35 | * |
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36 | * Supported control event types (in addition to those from |
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37 | * <OpenLayers.Control>): |
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38 | * selected - Triggered when a selection occurs. Listeners receive an |
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39 | * event with *filters* and *layer* properties. Filters will be an |
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40 | * array of OpenLayers.Filter objects created in order to perform |
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41 | * the particular selection. |
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42 | */ |
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43 | EVENT_TYPES: ["selected"], |
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44 | |
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45 | /** |
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46 | * APIProperty: clearOnDeactivate |
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47 | * {Boolean} Should the selection be cleared when the control is |
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48 | * deactivated. Default value is false. |
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49 | */ |
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50 | clearOnDeactivate: false, |
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51 | |
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52 | /** |
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53 | * APIProperty: layers |
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54 | * {Array(<OpenLayers.Layer.WMS>)} The WMS layers this control will work |
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55 | * on. |
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56 | */ |
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57 | layers: null, |
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58 | |
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59 | /** |
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60 | * Property: callbacks |
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61 | * {Object} The functions that are sent to the handler for callback |
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62 | */ |
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63 | callbacks: null, |
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64 | |
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65 | /** |
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66 | * APIProperty: selectionSymbolizer |
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67 | * {Object} Determines the styling of the selected objects. Default is |
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68 | * a selection in red. |
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69 | */ |
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70 | selectionSymbolizer: { |
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71 | 'Polygon': {fillColor: '#FF0000', stroke: false}, |
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72 | 'Line': {strokeColor: '#FF0000', strokeWidth: 2}, |
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73 | 'Point': {graphicName: 'square', fillColor: '#FF0000', pointRadius: 5} |
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74 | }, |
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75 | |
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76 | /** |
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77 | * APIProperty: layerOptions |
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78 | * {Object} The options to apply to the selection layer, by default the |
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79 | * selection layer will be kept out of the layer switcher. |
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80 | */ |
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81 | layerOptions: null, |
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82 | |
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83 | /** |
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84 | * APIProperty: handlerOptions |
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85 | * {Object} Used to set non-default properties on the control's handler |
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86 | */ |
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87 | handlerOptions: null, |
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88 | |
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89 | /** |
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90 | * APIProperty: sketchStyle |
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91 | * {<OpenLayers.Style>|Object} Style or symbolizer to use for the sketch |
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92 | * handler. The recommended way of styling the sketch layer, however, is |
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93 | * to configure an <OpenLayers.StyleMap> in the layerOptions of the |
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94 | * <handlerOptions>: |
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95 | * |
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96 | * (code) |
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97 | * new OpenLayers.Control.SLDSelect(OpenLayers.Handler.Path, { |
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98 | * handlerOptions: { |
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99 | * layerOptions: { |
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100 | * styleMap: new OpenLayers.StyleMap({ |
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101 | * "default": {strokeColor: "yellow"} |
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102 | * }); |
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103 | * } |
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104 | * } |
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105 | * }); |
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106 | * (end) |
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107 | */ |
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108 | sketchStyle: null, |
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109 | |
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110 | /** |
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111 | * APIProperty: wfsCache |
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112 | * {Object} Cache to use for storing parsed results from |
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113 | * <OpenLayers.Format.WFSDescribeFeatureType.read>. If not provided, |
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114 | * these will be cached on the prototype. |
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115 | */ |
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116 | wfsCache: {}, |
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117 | |
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118 | /** |
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119 | * APIProperty: layerCache |
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120 | * {Object} Cache to use for storing references to the selection layers. |
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121 | * Normally each source layer will have exactly 1 selection layer of |
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122 | * type OpenLayers.Layer.WMS.Post. If not provided, layers will |
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123 | * be cached on the prototype. Note that if <clearOnDeactivate> is |
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124 | * true, the layer will no longer be cached after deactivating the |
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125 | * control. |
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126 | */ |
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127 | layerCache: {}, |
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128 | |
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129 | /** |
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130 | * Constructor: OpenLayers.Control.SLDSelect |
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131 | * Create a new control for selecting features in WMS layers using |
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132 | * Styled Layer Descriptor (SLD). |
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133 | * |
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134 | * Parameters: |
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135 | * handler - {<OpenLayers.Class>} A sketch handler class. This determines |
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136 | * the type of selection, e.g. box (<OpenLayers.Handler.Box>), point |
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137 | * (<OpenLayers.Handler.Point>), path (<OpenLayers.Handler.Path>) or |
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138 | * polygon (<OpenLayers.Handler.Polygon>) selection. To use circle |
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139 | * type selection, use <OpenLayers.Handler.RegularPolygon> and pass |
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140 | * the number of desired sides (e.g. 40) as "sides" property to the |
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141 | * <handlerOptions>. |
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142 | * options - {Object} An object containing all configuration properties for |
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143 | * the control. |
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144 | * |
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145 | * Valid options: |
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146 | * layers - Array({<OpenLayers.Layer.WMS>}) The layers to perform the |
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147 | * selection on. |
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148 | */ |
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149 | initialize: function(handler, options) { |
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150 | // concatenate events specific to this control with those from the base |
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151 | this.EVENT_TYPES = |
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152 | OpenLayers.Control.SLDSelect.prototype.EVENT_TYPES.concat( |
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153 | OpenLayers.Control.prototype.EVENT_TYPES |
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154 | ); |
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155 | OpenLayers.Control.prototype.initialize.apply(this, [options]); |
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156 | |
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157 | this.callbacks = OpenLayers.Util.extend({done: this.select, |
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158 | click: this.select}, this.callbacks); |
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159 | this.handlerOptions = this.handlerOptions || {}; |
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160 | this.layerOptions = OpenLayers.Util.applyDefaults(this.layerOptions, { |
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161 | displayInLayerSwitcher: false |
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162 | }); |
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163 | if (this.sketchStyle) { |
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164 | this.handlerOptions.layerOptions = OpenLayers.Util.applyDefaults( |
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165 | this.handlerOptions.layerOptions, |
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166 | {styleMap: new OpenLayers.StyleMap({"default": this.sketchStyle})} |
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167 | ); |
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168 | } |
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169 | this.handler = new handler(this, this.callbacks, this.handlerOptions); |
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170 | }, |
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171 | |
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172 | /** |
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173 | * APIMethod: destroy |
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174 | * Take care of things that are not handled in superclass. |
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175 | */ |
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176 | destroy: function() { |
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177 | for (var key in this.layerCache) { |
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178 | delete this.layerCache[key]; |
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179 | } |
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180 | for (var key in this.wfsCache) { |
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181 | delete this.wfsCache[key]; |
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182 | } |
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183 | OpenLayers.Control.prototype.destroy.apply(this, arguments); |
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184 | }, |
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185 | |
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186 | /** |
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187 | * Method: coupleLayerVisiblity |
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188 | * Couple the selection layer and the source layer with respect to |
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189 | * layer visibility. So if the source layer is turned off, the |
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190 | * selection layer is also turned off. |
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191 | * |
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192 | * Parameters: |
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193 | * evt - {Object} |
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194 | */ |
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195 | coupleLayerVisiblity: function(evt) { |
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196 | this.setVisibility(evt.object.getVisibility()); |
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197 | }, |
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198 | |
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199 | /** |
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200 | * Method: createSelectionLayer |
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201 | * Creates a "clone" from the source layer in which the selection can |
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202 | * be drawn. This ensures both the source layer and the selection are |
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203 | * visible and not only the selection. |
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204 | * |
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205 | * Parameters: |
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206 | * source - {<OpenLayers.Layer.WMS>} The source layer on which the selection |
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207 | * is performed. |
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208 | * |
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209 | * Returns: |
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210 | * {<OpenLayers.Layer.WMS.Post>} A WMS Post layer since SLD selections can |
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211 | * easily get quite long. |
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212 | */ |
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213 | createSelectionLayer: function(source) { |
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214 | // check if we already have a selection layer for the source layer |
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215 | var selectionLayer; |
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216 | if (!this.layerCache[source.id]) { |
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217 | selectionLayer = new OpenLayers.Layer.WMS.Post(source.name, |
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218 | source.url, source.params, |
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219 | OpenLayers.Util.applyDefaults( |
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220 | this.layerOptions, |
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221 | source.getOptions()) |
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222 | ); |
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223 | this.layerCache[source.id] = selectionLayer; |
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224 | // make sure the layers are coupled wrt visibility, but only |
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225 | // if they are not displayed in the layer switcher, because in |
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226 | // that case the user cannot control visibility. |
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227 | if (this.layerOptions.displayInLayerSwitcher === false) { |
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228 | source.events.on({ |
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229 | "visibilitychanged": this.coupleLayerVisiblity, |
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230 | scope: selectionLayer}); |
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231 | } |
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232 | this.map.addLayer(selectionLayer); |
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233 | } else { |
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234 | selectionLayer = this.layerCache[source.id]; |
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235 | } |
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236 | return selectionLayer; |
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237 | }, |
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238 | |
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239 | /** |
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240 | * Method: createSLD |
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241 | * Create the SLD document for the layer using the supplied filters. |
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242 | * |
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243 | * Parameters: |
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244 | * layer - {<OpenLayers.Layer.WMS>} |
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245 | * filters - Array({<OpenLayers.Filter>}) The filters to be applied. |
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246 | * geometryAttributes - Array({Object}) The geometry attributes of the |
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247 | * layer. |
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248 | * |
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249 | * Returns: |
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250 | * {String} The SLD document generated as a string. |
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251 | */ |
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252 | createSLD: function(layer, filters, geometryAttributes) { |
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253 | var sld = {version: "1.0.0", namedLayers: {}}; |
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254 | var layerNames = [layer.params.LAYERS].join(",").split(","); |
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255 | for (var i=0, len=layerNames.length; i<len; i++) { |
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256 | var name = layerNames[i]; |
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257 | sld.namedLayers[name] = {name: name, userStyles: []}; |
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258 | var symbolizer = this.selectionSymbolizer; |
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259 | var geometryAttribute = geometryAttributes[i]; |
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260 | if (geometryAttribute.type.indexOf('Polygon') >= 0) { |
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261 | symbolizer = {Polygon: this.selectionSymbolizer['Polygon']}; |
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262 | } else if (geometryAttribute.type.indexOf('LineString') >= 0) { |
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263 | symbolizer = {Line: this.selectionSymbolizer['Line']}; |
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264 | } else if (geometryAttribute.type.indexOf('Point') >= 0) { |
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265 | symbolizer = {Point: this.selectionSymbolizer['Point']}; |
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266 | } |
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267 | var filter = filters[i]; |
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268 | sld.namedLayers[name].userStyles.push({name: 'default', rules: [ |
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269 | new OpenLayers.Rule({symbolizer: symbolizer, |
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270 | filter: filter, |
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271 | maxScaleDenominator: layer.options.minScale}) |
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272 | ]}); |
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273 | } |
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274 | return new OpenLayers.Format.SLD().write(sld); |
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275 | }, |
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276 | |
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277 | /** |
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278 | * Method: parseDescribeLayer |
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279 | * Parse the SLD WMS DescribeLayer response and issue the corresponding |
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280 | * WFS DescribeFeatureType request |
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281 | * |
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282 | * request - {XMLHttpRequest} The request object. |
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283 | */ |
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284 | parseDescribeLayer: function(request) { |
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285 | var format = new OpenLayers.Format.WMSDescribeLayer(); |
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286 | var doc = request.responseXML; |
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287 | if(!doc || !doc.documentElement) { |
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288 | doc = request.responseText; |
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289 | } |
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290 | var describeLayer = format.read(doc); |
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291 | var typeNames = []; |
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292 | var url = null; |
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293 | for (var i=0, len=describeLayer.length; i<len; i++) { |
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294 | // perform a WFS DescribeFeatureType request |
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295 | if (describeLayer[i].owsType == "WFS") { |
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296 | typeNames.push(describeLayer[i].typeName); |
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297 | url = describeLayer[i].owsURL; |
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298 | } |
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299 | } |
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300 | var options = { |
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301 | url: url, |
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302 | params: { |
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303 | SERVICE: "WFS", |
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304 | TYPENAME: typeNames.toString(), |
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305 | REQUEST: "DescribeFeatureType", |
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306 | VERSION: "1.0.0" |
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307 | }, |
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308 | callback: function(request) { |
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309 | var format = new OpenLayers.Format.WFSDescribeFeatureType(); |
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310 | var doc = request.responseXML; |
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311 | if(!doc || !doc.documentElement) { |
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312 | doc = request.responseText; |
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313 | } |
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314 | var describeFeatureType = format.read(doc); |
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315 | this.control.wfsCache[this.layer.id] = describeFeatureType; |
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316 | this.control._queue && this.control.applySelection(); |
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317 | }, |
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318 | scope: this |
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319 | }; |
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320 | OpenLayers.Request.GET(options); |
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321 | }, |
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322 | |
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323 | /** |
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324 | * Method: getGeometryAttributes |
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325 | * Look up the geometry attributes from the WFS DescribeFeatureType response |
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326 | * |
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327 | * Parameters: |
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328 | * layer - {<OpenLayers.Layer.WMS>} The layer for which to look up the |
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329 | * geometry attributes. |
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330 | * |
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331 | * Returns: |
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332 | * Array({Object}) Array of geometry attributes |
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333 | */ |
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334 | getGeometryAttributes: function(layer) { |
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335 | var result = []; |
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336 | var cache = this.wfsCache[layer.id]; |
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337 | for (var i=0, len=cache.featureTypes.length; i<len; i++) { |
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338 | var typeName = cache.featureTypes[i]; |
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339 | var properties = typeName.properties; |
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340 | for (var j=0, lenj=properties.length; j < lenj; j++) { |
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341 | var property = properties[j]; |
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342 | var type = property.type; |
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343 | if ((type.indexOf('LineString') >= 0) || |
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344 | (type.indexOf('GeometryAssociationType') >=0) || |
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345 | (type.indexOf('GeometryPropertyType') >= 0) || |
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346 | (type.indexOf('Point') >= 0) || |
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347 | (type.indexOf('Polygon') >= 0) ) { |
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348 | result.push(property); |
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349 | } |
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350 | } |
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351 | } |
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352 | return result; |
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353 | }, |
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354 | |
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355 | /** |
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356 | * APIMethod: activate |
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357 | * Activate the control. Activating the control will perform a SLD WMS |
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358 | * DescribeLayer request followed by a WFS DescribeFeatureType request |
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359 | * so that the proper symbolizers can be chosen based on the geometry |
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360 | * type. |
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361 | */ |
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362 | activate: function() { |
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363 | var activated = OpenLayers.Control.prototype.activate.call(this); |
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364 | if(activated) { |
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365 | for (var i=0, len=this.layers.length; i<len; i++) { |
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366 | var layer = this.layers[i]; |
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367 | if (layer && !this.wfsCache[layer.id]) { |
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368 | var options = { |
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369 | url: layer.url, |
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370 | params: { |
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371 | SERVICE: "WMS", |
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372 | VERSION: layer.params.VERSION, |
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373 | LAYERS: layer.params.LAYERS, |
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374 | REQUEST: "DescribeLayer" |
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375 | }, |
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376 | callback: this.parseDescribeLayer, |
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377 | scope: {layer: layer, control: this} |
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378 | }; |
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379 | OpenLayers.Request.GET(options); |
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380 | } |
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381 | } |
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382 | } |
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383 | return activated; |
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384 | }, |
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385 | |
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386 | /** |
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387 | * APIMethod: deactivate |
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388 | * Deactivate the control. If clearOnDeactivate is true, remove the |
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389 | * selection layer(s). |
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390 | */ |
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391 | deactivate: function() { |
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392 | var deactivated = OpenLayers.Control.prototype.deactivate.call(this); |
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393 | if(deactivated) { |
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394 | for (var i=0, len=this.layers.length; i<len; i++) { |
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395 | var layer = this.layers[i]; |
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396 | if (layer && this.clearOnDeactivate === true) { |
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397 | var layerCache = this.layerCache; |
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398 | var selectionLayer = layerCache[layer.id]; |
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399 | if (selectionLayer) { |
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400 | layer.events.un({ |
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401 | "visibilitychanged": this.coupleLayerVisiblity, |
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402 | scope: selectionLayer}); |
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403 | selectionLayer.destroy(); |
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404 | delete layerCache[layer.id]; |
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405 | } |
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406 | } |
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407 | } |
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408 | } |
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409 | return deactivated; |
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410 | }, |
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411 | |
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412 | /** |
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413 | * APIMethod: setLayers |
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414 | * Set the layers on which the selection should be performed. Call the |
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415 | * setLayers method if the layer(s) to be used change and the same |
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416 | * control should be used on a new set of layers. |
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417 | * If the control is already active, it will be active after the new |
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418 | * set of layers is set. |
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419 | * |
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420 | * Parameters: |
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421 | * layers - {Array(<OpenLayers.Layer.WMS>)} The new set of layers on which |
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422 | * the selection should be performed. |
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423 | */ |
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424 | setLayers: function(layers) { |
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425 | if(this.active) { |
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426 | this.deactivate(); |
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427 | this.layers = layers; |
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428 | this.activate(); |
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429 | } else { |
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430 | this.layers = layers; |
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431 | } |
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432 | }, |
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433 | |
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434 | /** |
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435 | * Function: createFilter |
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436 | * Create the filter to be used in the SLD. |
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437 | * |
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438 | * Parameters: |
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439 | * geometryAttribute - {Object} Used to get the name of the geometry |
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440 | * attribute which is needed for constructing the spatial filter. |
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441 | * geometry - {<OpenLayers.Geometry>} The geometry to use. |
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442 | * |
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443 | * Returns: |
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444 | * {<OpenLayers.Filter.Spatial>} The spatial filter created. |
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445 | */ |
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446 | createFilter: function(geometryAttribute, geometry) { |
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447 | var filter = null; |
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448 | if (this.handler instanceof OpenLayers.Handler.RegularPolygon) { |
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449 | // box |
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450 | if (this.handler.irregular === true) { |
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451 | filter = new OpenLayers.Filter.Spatial({ |
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452 | type: OpenLayers.Filter.Spatial.BBOX, |
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453 | property: geometryAttribute.name, |
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454 | value: geometry.getBounds()} |
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455 | ); |
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456 | } else { |
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457 | filter = new OpenLayers.Filter.Spatial({ |
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458 | type: OpenLayers.Filter.Spatial.INTERSECTS, |
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459 | property: geometryAttribute.name, |
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460 | value: geometry} |
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461 | ); |
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462 | } |
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463 | } else if (this.handler instanceof OpenLayers.Handler.Polygon) { |
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464 | filter = new OpenLayers.Filter.Spatial({ |
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465 | type: OpenLayers.Filter.Spatial.INTERSECTS, |
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466 | property: geometryAttribute.name, |
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467 | value: geometry} |
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468 | ); |
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469 | } else if (this.handler instanceof OpenLayers.Handler.Path) { |
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470 | // if source layer is point based, use DWITHIN instead |
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471 | if (geometryAttribute.type.indexOf('Point') >= 0) { |
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472 | filter = new OpenLayers.Filter.Spatial({ |
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473 | type: OpenLayers.Filter.Spatial.DWITHIN, |
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474 | property: geometryAttribute.name, |
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475 | distance: this.map.getExtent().getWidth()*0.01 , |
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476 | distanceUnits: this.map.getUnits(), |
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477 | value: geometry} |
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478 | ); |
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479 | } else { |
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480 | filter = new OpenLayers.Filter.Spatial({ |
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481 | type: OpenLayers.Filter.Spatial.INTERSECTS, |
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482 | property: geometryAttribute.name, |
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483 | value: geometry} |
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484 | ); |
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485 | } |
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486 | } else if (this.handler instanceof OpenLayers.Handler.Click) { |
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487 | if (geometryAttribute.type.indexOf('Polygon') >= 0) { |
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488 | filter = new OpenLayers.Filter.Spatial({ |
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489 | type: OpenLayers.Filter.Spatial.INTERSECTS, |
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490 | property: geometryAttribute.name, |
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491 | value: geometry} |
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492 | ); |
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493 | } else { |
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494 | filter = new OpenLayers.Filter.Spatial({ |
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495 | type: OpenLayers.Filter.Spatial.DWITHIN, |
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496 | property: geometryAttribute.name, |
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497 | distance: this.map.getExtent().getWidth()*0.01 , |
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498 | distanceUnits: this.map.getUnits(), |
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499 | value: geometry} |
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500 | ); |
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501 | } |
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502 | } |
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503 | return filter; |
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504 | }, |
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505 | |
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506 | /** |
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507 | * Method: select |
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508 | * When the handler is done, use SLD_BODY on the selection layer to |
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509 | * display the selection in the map. |
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510 | * |
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511 | * Parameters: |
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512 | * geometry - {Object} or {<OpenLayers.Geometry>} |
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513 | */ |
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514 | select: function(geometry) { |
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515 | this._queue = function() { |
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516 | for (var i=0, len=this.layers.length; i<len; i++) { |
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517 | var layer = this.layers[i]; |
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518 | var geometryAttributes = this.getGeometryAttributes(layer); |
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519 | var filters = []; |
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520 | for (var j=0, lenj=geometryAttributes.length; j<lenj; j++) { |
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521 | var geometryAttribute = geometryAttributes[j]; |
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522 | if (geometryAttribute !== null) { |
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523 | // from the click handler we will not get an actual |
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524 | // geometry so transform |
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525 | if (!(geometry instanceof OpenLayers.Geometry)) { |
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526 | var point = this.map.getLonLatFromPixel( |
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527 | geometry.xy); |
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528 | geometry = new OpenLayers.Geometry.Point( |
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529 | point.lon, point.lat); |
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530 | } |
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531 | var filter = this.createFilter(geometryAttribute, |
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532 | geometry); |
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533 | if (filter !== null) { |
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534 | filters.push(filter); |
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535 | } |
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536 | } |
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537 | } |
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538 | |
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539 | var selectionLayer = this.createSelectionLayer(layer); |
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540 | var sld = this.createSLD(layer, filters, geometryAttributes); |
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541 | |
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542 | this.events.triggerEvent("selected", { |
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543 | layer: layer, |
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544 | filters: filters |
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545 | }); |
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546 | |
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547 | selectionLayer.mergeNewParams({SLD_BODY: sld}); |
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548 | delete this._queue; |
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549 | } |
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550 | }; |
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551 | this.applySelection(); |
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552 | }, |
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553 | |
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554 | /** |
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555 | * Method: applySelection |
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556 | * Checks if all required wfs data is cached, and applies the selection |
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557 | */ |
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558 | applySelection: function() { |
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559 | var canApply = true; |
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560 | for (var i=0, len=this.layers.length; i<len; i++) { |
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561 | if(!this.wfsCache[this.layers[i].id]) { |
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562 | canApply = false; |
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563 | break; |
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564 | } |
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565 | } |
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566 | canApply && this._queue.call(this); |
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567 | }, |
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568 | |
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569 | CLASS_NAME: "OpenLayers.Control.SLDSelect" |
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570 | }); |
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