1 | /** |
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2 | * Copyright (c) 2008-2010 The Open Source Geospatial Foundation |
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3 | * |
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4 | * Published under the BSD license. |
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5 | * See http://svn.geoext.org/core/trunk/geoext/license.txt for the full text |
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6 | * of the license. |
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7 | */ |
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8 | |
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9 | /** |
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10 | * @include GeoExt/data/LayerRecord.js |
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11 | */ |
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12 | |
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13 | /** api: (define) |
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14 | * module = GeoExt.data |
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15 | * class = LayerReader |
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16 | * base_link = `Ext.data.DataReader <http://dev.sencha.com/deploy/dev/docs/?class=Ext.data.DataReader>`_ |
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17 | */ |
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18 | Ext.namespace("GeoExt", "GeoExt.data"); |
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19 | |
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20 | /** api: example |
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21 | * Sample using a reader to create records from an array of layers: |
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22 | * |
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23 | * .. code-block:: javascript |
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24 | * |
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25 | * var reader = new GeoExt.data.LayerReader(); |
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26 | * var layerData = reader.readRecords(map.layers); |
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27 | * var numRecords = layerData.totalRecords; |
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28 | * var layerRecords = layerData.records; |
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29 | */ |
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30 | |
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31 | /** api: constructor |
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32 | * .. class:: LayerReader(meta, recordType) |
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33 | * |
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34 | * Data reader class to create an array of |
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35 | * :class:`GeoExt.data.LayerRecord` objects from an array of |
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36 | * ``OpenLayers.Layer`` objects for use in a |
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37 | * :class:`GeoExt.data.LayerStore` object. |
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38 | */ |
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39 | GeoExt.data.LayerReader = function(meta, recordType) { |
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40 | meta = meta || {}; |
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41 | if(!(recordType instanceof Function)) { |
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42 | recordType = GeoExt.data.LayerRecord.create( |
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43 | recordType || meta.fields || {}); |
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44 | } |
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45 | GeoExt.data.LayerReader.superclass.constructor.call( |
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46 | this, meta, recordType); |
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47 | }; |
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48 | |
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49 | Ext.extend(GeoExt.data.LayerReader, Ext.data.DataReader, { |
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50 | |
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51 | /** private: property[totalRecords] |
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52 | * ``Integer`` |
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53 | */ |
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54 | totalRecords: null, |
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55 | |
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56 | /** api: method[readRecords] |
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57 | * :param layers: ``Array(OpenLayers.Layer)`` List of layers for creating |
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58 | * records. |
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59 | * :return: ``Object`` An object with ``records`` and ``totalRecords`` |
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60 | * properties. |
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61 | * |
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62 | * From an array of ``OpenLayers.Layer`` objects create a data block |
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63 | * containing :class:`GeoExt.data.LayerRecord` objects. |
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64 | */ |
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65 | readRecords : function(layers) { |
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66 | var records = []; |
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67 | if(layers) { |
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68 | var recordType = this.recordType, fields = recordType.prototype.fields; |
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69 | var i, lenI, j, lenJ, layer, values, field, v; |
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70 | for(i = 0, lenI = layers.length; i < lenI; i++) { |
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71 | layer = layers[i]; |
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72 | values = {}; |
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73 | for(j = 0, lenJ = fields.length; j < lenJ; j++){ |
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74 | field = fields.items[j]; |
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75 | v = layer[field.mapping || field.name] || |
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76 | field.defaultValue; |
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77 | v = field.convert(v); |
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78 | values[field.name] = v; |
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79 | } |
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80 | values.layer = layer; |
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81 | records[records.length] = new recordType(values, layer.id); |
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82 | } |
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83 | } |
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84 | return { |
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85 | records: records, |
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86 | totalRecords: this.totalRecords != null ? this.totalRecords : records.length |
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87 | }; |
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88 | } |
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89 | }); |
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