[76] | 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 Gears/gears_init.js |
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| 8 | * @requires OpenLayers/Protocol/SQL.js |
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| 9 | * @requires OpenLayers/Format/JSON.js |
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| 10 | * @requires OpenLayers/Format/WKT.js |
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| 11 | */ |
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| 12 | |
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| 13 | /** |
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| 14 | * Class: OpenLayers.Protocol.SQL.Gears |
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| 15 | * This Protocol stores feature in the browser via the Gears Database module |
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| 16 | * <http://code.google.com/apis/gears/api_database.html>. |
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| 17 | * |
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| 18 | * The main advantage is that all the read, create, update and delete operations |
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| 19 | * can be done offline. |
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| 20 | * |
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| 21 | * Inherits from: |
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| 22 | * - <OpenLayers.Protocol.SQL> |
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| 23 | */ |
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| 24 | OpenLayers.Protocol.SQL.Gears = OpenLayers.Class(OpenLayers.Protocol.SQL, { |
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| 25 | |
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| 26 | /** |
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| 27 | * Property: FID_PREFIX |
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| 28 | * {String} |
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| 29 | */ |
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| 30 | FID_PREFIX: '__gears_fid__', |
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| 31 | |
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| 32 | /** |
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| 33 | * Property: NULL_GEOMETRY |
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| 34 | * {String} |
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| 35 | */ |
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| 36 | NULL_GEOMETRY: '__gears_null_geometry__', |
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| 37 | |
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| 38 | /** |
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| 39 | * Property: NULL_FEATURE_STATE |
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| 40 | * {String} |
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| 41 | */ |
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| 42 | NULL_FEATURE_STATE: '__gears_null_feature_state__', |
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| 43 | |
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| 44 | /** |
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| 45 | * Property: jsonParser |
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| 46 | * {<OpenLayers.Format.JSON>} |
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| 47 | */ |
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| 48 | jsonParser: null, |
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| 49 | |
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| 50 | /** |
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| 51 | * Property: wktParser |
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| 52 | * {<OpenLayers.Format.WKT>} |
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| 53 | */ |
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| 54 | wktParser: null, |
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| 55 | |
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| 56 | /** |
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| 57 | * Property: fidRegExp |
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| 58 | * {RegExp} Regular expression to know whether a feature was |
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| 59 | * created in offline mode. |
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| 60 | */ |
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| 61 | fidRegExp: null, |
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| 62 | |
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| 63 | /** |
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| 64 | * Property: saveFeatureState |
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| 65 | * {Boolean} Whether to save the feature state (<OpenLayers.State>) |
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| 66 | * into the database, defaults to true. |
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| 67 | */ |
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| 68 | saveFeatureState: true, |
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| 69 | |
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| 70 | /** |
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| 71 | * Property: typeOfFid |
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| 72 | * {String} The type of the feature identifier, either "number" or |
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| 73 | * "string", defaults to "string". |
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| 74 | */ |
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| 75 | typeOfFid: "string", |
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| 76 | |
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| 77 | /** |
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| 78 | * Property: db |
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| 79 | * {GearsDatabase} |
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| 80 | */ |
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| 81 | db: null, |
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| 82 | |
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| 83 | /** |
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| 84 | * Constructor: OpenLayers.Protocol.SQL.Gears |
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| 85 | */ |
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| 86 | initialize: function(options) { |
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| 87 | if (!this.supported()) { |
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| 88 | return; |
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| 89 | } |
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| 90 | OpenLayers.Protocol.SQL.prototype.initialize.apply(this, [options]); |
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| 91 | this.jsonParser = new OpenLayers.Format.JSON(); |
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| 92 | this.wktParser = new OpenLayers.Format.WKT(); |
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| 93 | |
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| 94 | this.fidRegExp = new RegExp('^' + this.FID_PREFIX); |
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| 95 | this.initializeDatabase(); |
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| 96 | |
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| 97 | |
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| 98 | }, |
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| 99 | |
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| 100 | /** |
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| 101 | * Method: initializeDatabase |
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| 102 | */ |
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| 103 | initializeDatabase: function() { |
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| 104 | this.db = google.gears.factory.create('beta.database'); |
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| 105 | this.db.open(this.databaseName); |
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| 106 | this.db.execute( |
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| 107 | "CREATE TABLE IF NOT EXISTS " + this.tableName + |
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| 108 | " (fid TEXT UNIQUE, geometry TEXT, properties TEXT," + |
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| 109 | " state TEXT)"); |
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| 110 | }, |
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| 111 | |
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| 112 | /** |
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| 113 | * APIMethod: destroy |
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| 114 | * Clean up the protocol. |
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| 115 | */ |
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| 116 | destroy: function() { |
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| 117 | this.db.close(); |
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| 118 | this.db = null; |
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| 119 | |
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| 120 | this.jsonParser = null; |
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| 121 | this.wktParser = null; |
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| 122 | |
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| 123 | OpenLayers.Protocol.SQL.prototype.destroy.apply(this); |
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| 124 | }, |
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| 125 | |
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| 126 | /** |
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| 127 | * APIMethod: supported |
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| 128 | * Determine whether a browser supports Gears |
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| 129 | * |
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| 130 | * Returns: |
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| 131 | * {Boolean} The browser supports Gears |
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| 132 | */ |
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| 133 | supported: function() { |
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| 134 | return !!(window.google && google.gears); |
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| 135 | }, |
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| 136 | |
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| 137 | /** |
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| 138 | * APIMethod: read |
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| 139 | * Read all features from the database and return a |
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| 140 | * <OpenLayers.Protocol.Response> instance. If the options parameter |
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| 141 | * contains a callback attribute, the function is called with the response |
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| 142 | * as a parameter. |
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| 143 | * |
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| 144 | * Parameters: |
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| 145 | * options - {Object} Optional object for configuring the request; it |
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| 146 | * can have the {Boolean} property "noFeatureStateReset" which |
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| 147 | * specifies if the state of features read from the Gears |
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| 148 | * database must be reset to null, if "noFeatureStateReset" |
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| 149 | * is undefined or false then each feature's state is reset |
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| 150 | * to null, if "noFeatureStateReset" is true the feature state |
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| 151 | * is preserved. |
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| 152 | * |
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| 153 | * Returns: |
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| 154 | * {<OpenLayers.Protocol.Response>} An <OpenLayers.Protocol.Response> |
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| 155 | * object. |
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| 156 | */ |
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| 157 | read: function(options) { |
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| 158 | OpenLayers.Protocol.prototype.read.apply(this, arguments); |
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| 159 | options = OpenLayers.Util.applyDefaults(options, this.options); |
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| 160 | |
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| 161 | var feature, features = []; |
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| 162 | var rs = this.db.execute("SELECT * FROM " + this.tableName); |
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| 163 | while (rs.isValidRow()) { |
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| 164 | feature = this.unfreezeFeature(rs); |
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| 165 | if (this.evaluateFilter(feature, options.filter)) { |
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| 166 | if (!options.noFeatureStateReset) { |
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| 167 | feature.state = null; |
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| 168 | } |
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| 169 | features.push(feature); |
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| 170 | } |
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| 171 | rs.next(); |
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| 172 | } |
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| 173 | rs.close(); |
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| 174 | |
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| 175 | var resp = new OpenLayers.Protocol.Response({ |
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| 176 | code: OpenLayers.Protocol.Response.SUCCESS, |
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| 177 | requestType: "read", |
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| 178 | features: features |
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| 179 | }); |
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| 180 | |
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| 181 | if (options && options.callback) { |
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| 182 | options.callback.call(options.scope, resp); |
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| 183 | } |
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| 184 | |
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| 185 | return resp; |
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| 186 | }, |
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| 187 | |
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| 188 | /** |
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| 189 | * Method: unfreezeFeature |
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| 190 | * |
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| 191 | * Parameters: |
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| 192 | * row - {ResultSet} |
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| 193 | * |
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| 194 | * Returns: |
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| 195 | * {<OpenLayers.Feature.Vector>} |
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| 196 | */ |
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| 197 | unfreezeFeature: function(row) { |
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| 198 | var feature; |
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| 199 | var wkt = row.fieldByName('geometry'); |
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| 200 | if (wkt == this.NULL_GEOMETRY) { |
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| 201 | feature = new OpenLayers.Feature.Vector(); |
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| 202 | } else { |
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| 203 | feature = this.wktParser.read(wkt); |
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| 204 | } |
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| 205 | |
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| 206 | feature.attributes = this.jsonParser.read( |
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| 207 | row.fieldByName('properties')); |
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| 208 | |
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| 209 | feature.fid = this.extractFidFromField(row.fieldByName('fid')); |
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| 210 | |
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| 211 | var state = row.fieldByName('state'); |
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| 212 | if (state == this.NULL_FEATURE_STATE) { |
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| 213 | state = null; |
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| 214 | } |
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| 215 | feature.state = state; |
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| 216 | |
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| 217 | return feature; |
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| 218 | }, |
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| 219 | |
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| 220 | /** |
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| 221 | * Method: extractFidFromField |
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| 222 | * |
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| 223 | * Parameters: |
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| 224 | * field - {String} |
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| 225 | * |
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| 226 | * Returns |
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| 227 | * {String} or {Number} The fid. |
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| 228 | */ |
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| 229 | extractFidFromField: function(field) { |
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| 230 | if (!field.match(this.fidRegExp) && this.typeOfFid == "number") { |
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| 231 | field = parseFloat(field); |
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| 232 | } |
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| 233 | return field; |
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| 234 | }, |
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| 235 | |
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| 236 | /** |
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| 237 | * APIMethod: create |
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| 238 | * Create new features into the database. |
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| 239 | * |
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| 240 | * Parameters: |
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| 241 | * features - {Array({<OpenLayers.Feature.Vector>})} or |
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| 242 | * {<OpenLayers.Feature.Vector>} The features to create in |
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| 243 | * the database. |
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| 244 | * options - {Object} Optional object for configuring the request. |
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| 245 | * |
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| 246 | * Returns: |
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| 247 | * {<OpenLayers.Protocol.Response>} An <OpenLayers.Protocol.Response> |
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| 248 | * object. |
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| 249 | */ |
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| 250 | create: function(features, options) { |
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| 251 | options = OpenLayers.Util.applyDefaults(options, this.options); |
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| 252 | |
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| 253 | var resp = this.createOrUpdate(features); |
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| 254 | resp.requestType = "create"; |
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| 255 | |
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| 256 | if (options && options.callback) { |
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| 257 | options.callback.call(options.scope, resp); |
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| 258 | } |
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| 259 | |
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| 260 | return resp; |
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| 261 | }, |
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| 262 | |
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| 263 | /** |
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| 264 | * APIMethod: update |
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| 265 | * Construct a request updating modified feature. |
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| 266 | * |
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| 267 | * Parameters: |
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| 268 | * features - {Array({<OpenLayers.Feature.Vector>})} or |
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| 269 | * {<OpenLayers.Feature.Vector>} The features to update in |
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| 270 | * the database. |
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| 271 | * options - {Object} Optional object for configuring the request. |
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| 272 | * |
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| 273 | * Returns: |
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| 274 | * {<OpenLayers.Protocol.Response>} An <OpenLayers.Protocol.Response> |
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| 275 | * object. |
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| 276 | */ |
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| 277 | update: function(features, options) { |
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| 278 | options = OpenLayers.Util.applyDefaults(options, this.options); |
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| 279 | |
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| 280 | var resp = this.createOrUpdate(features); |
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| 281 | resp.requestType = "update"; |
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| 282 | |
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| 283 | if (options && options.callback) { |
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| 284 | options.callback.call(options.scope, resp); |
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| 285 | } |
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| 286 | |
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| 287 | return resp; |
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| 288 | }, |
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| 289 | |
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| 290 | /** |
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| 291 | * Method: createOrUpdate |
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| 292 | * Construct a request for updating or creating features in the |
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| 293 | * database. |
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| 294 | * |
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| 295 | * Parameters: |
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| 296 | * features - {Array({<OpenLayers.Feature.Vector>})} or |
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| 297 | * {<OpenLayers.Feature.Vector>} The feature to create or update |
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| 298 | * in the database. |
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| 299 | * |
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| 300 | * Returns: |
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| 301 | * {<OpenLayers.Protocol.Response>} An <OpenLayers.Protocol.Response> |
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| 302 | * object. |
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| 303 | */ |
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| 304 | createOrUpdate: function(features) { |
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| 305 | if (!(features instanceof Array)) { |
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| 306 | features = [features]; |
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| 307 | } |
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| 308 | |
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| 309 | var i, len = features.length, feature; |
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| 310 | var insertedFeatures = new Array(len); |
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| 311 | |
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| 312 | for (i = 0; i < len; i++) { |
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| 313 | feature = features[i]; |
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| 314 | var params = this.freezeFeature(feature); |
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| 315 | this.db.execute( |
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| 316 | "REPLACE INTO " + this.tableName + |
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| 317 | " (fid, geometry, properties, state)" + |
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| 318 | " VALUES (?, ?, ?, ?)", |
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| 319 | params); |
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| 320 | |
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| 321 | var clone = feature.clone(); |
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| 322 | clone.fid = this.extractFidFromField(params[0]); |
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| 323 | insertedFeatures[i] = clone; |
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| 324 | } |
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| 325 | |
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| 326 | return new OpenLayers.Protocol.Response({ |
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| 327 | code: OpenLayers.Protocol.Response.SUCCESS, |
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| 328 | features: insertedFeatures, |
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| 329 | reqFeatures: features |
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| 330 | }); |
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| 331 | }, |
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| 332 | |
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| 333 | /** |
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| 334 | * Method: freezeFeature |
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| 335 | * |
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| 336 | * Parameters: |
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| 337 | * feature - {<OpenLayers.Feature.Vector>} |
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| 338 | * state - {String} The feature state to store in the database. |
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| 339 | * |
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| 340 | * Returns: |
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| 341 | * {Array} |
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| 342 | */ |
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| 343 | freezeFeature: function(feature) { |
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| 344 | // 2 notes: |
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| 345 | // - fid might not be a string |
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| 346 | // - getFeatureStateForFreeze needs the feature fid to it's stored |
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| 347 | // in the feature here |
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| 348 | feature.fid = feature.fid != null ? |
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| 349 | "" + feature.fid : OpenLayers.Util.createUniqueID(this.FID_PREFIX); |
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| 350 | |
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| 351 | var geometry = feature.geometry != null ? |
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| 352 | feature.geometry.toString() : this.NULL_GEOMETRY; |
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| 353 | |
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| 354 | var properties = this.jsonParser.write(feature.attributes); |
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| 355 | |
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| 356 | var state = this.getFeatureStateForFreeze(feature); |
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| 357 | |
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| 358 | return [feature.fid, geometry, properties, state]; |
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| 359 | }, |
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| 360 | |
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| 361 | /** |
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| 362 | * Method: getFeatureStateForFreeze |
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| 363 | * Get the state of the feature to store into the database. |
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| 364 | * |
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| 365 | * Parameters: |
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| 366 | * feature - {<OpenLayers.Feature.Vector>} The feature. |
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| 367 | * |
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| 368 | * Returns |
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| 369 | * {String} The state |
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| 370 | */ |
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| 371 | getFeatureStateForFreeze: function(feature) { |
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| 372 | var state; |
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| 373 | if (!this.saveFeatureState) { |
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| 374 | state = this.NULL_FEATURE_STATE; |
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| 375 | } else if (this.createdOffline(feature)) { |
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| 376 | // if the feature was created in offline mode, its |
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| 377 | // state must remain INSERT |
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| 378 | state = OpenLayers.State.INSERT; |
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| 379 | } else { |
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| 380 | state = feature.state; |
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| 381 | } |
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| 382 | return state; |
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| 383 | }, |
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| 384 | |
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| 385 | /** |
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| 386 | * APIMethod: delete |
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| 387 | * Delete features from the database. |
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| 388 | * |
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| 389 | * Parameters: |
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| 390 | * features - {Array({<OpenLayers.Feature.Vector>})} or |
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| 391 | * {<OpenLayers.Feature.Vector>} |
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| 392 | * options - {Object} Optional object for configuring the request. |
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| 393 | * This object is modified and should not be reused. |
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| 394 | * |
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| 395 | * Returns: |
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| 396 | * {<OpenLayers.Protocol.Response>} An <OpenLayers.Protocol.Response> |
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| 397 | * object. |
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| 398 | */ |
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| 399 | "delete": function(features, options) { |
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| 400 | if (!(features instanceof Array)) { |
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| 401 | features = [features]; |
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| 402 | } |
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| 403 | |
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| 404 | options = OpenLayers.Util.applyDefaults(options, this.options); |
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| 405 | |
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| 406 | var i, len, feature; |
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| 407 | for (i = 0, len = features.length; i < len; i++) { |
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| 408 | feature = features[i]; |
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| 409 | |
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| 410 | // if saveFeatureState is set to true and if the feature wasn't created |
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| 411 | // in offline mode we don't delete it in the database but just update |
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| 412 | // it state column |
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| 413 | if (this.saveFeatureState && !this.createdOffline(feature)) { |
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| 414 | var toDelete = feature.clone(); |
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| 415 | toDelete.fid = feature.fid; |
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| 416 | if (toDelete.geometry) { |
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| 417 | toDelete.geometry.destroy(); |
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| 418 | toDelete.geometry = null; |
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| 419 | } |
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| 420 | toDelete.state = feature.state; |
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| 421 | this.createOrUpdate(toDelete); |
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| 422 | } else { |
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| 423 | this.db.execute( |
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| 424 | "DELETE FROM " + this.tableName + |
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| 425 | " WHERE fid = ?", [feature.fid]); |
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| 426 | } |
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| 427 | } |
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| 428 | |
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| 429 | var resp = new OpenLayers.Protocol.Response({ |
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| 430 | code: OpenLayers.Protocol.Response.SUCCESS, |
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| 431 | requestType: "delete", |
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| 432 | reqFeatures: features |
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| 433 | }); |
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| 434 | |
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| 435 | if (options && options.callback) { |
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| 436 | options.callback.call(options.scope, resp); |
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| 437 | } |
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| 438 | |
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| 439 | return resp; |
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| 440 | }, |
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| 441 | |
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| 442 | /** |
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| 443 | * Method: createdOffline |
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| 444 | * Returns true if the feature had a feature id when it was created in |
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| 445 | * the Gears database, false otherwise; this is determined by |
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| 446 | * checking the form of the feature's fid value. |
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| 447 | * |
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| 448 | * Parameters: |
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| 449 | * feature - {<OpenLayers.Feature.Vector>} |
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| 450 | * |
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| 451 | * Returns: |
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| 452 | * {Boolean} |
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| 453 | */ |
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| 454 | createdOffline: function(feature) { |
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| 455 | return (typeof feature.fid == "string" && |
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| 456 | !!(feature.fid.match(this.fidRegExp))); |
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| 457 | }, |
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| 458 | |
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| 459 | /** |
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| 460 | * APIMethod: commit |
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| 461 | * Go over the features and for each take action |
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| 462 | * based on the feature state. Possible actions are create, |
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| 463 | * update and delete. |
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| 464 | * |
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| 465 | * Parameters: |
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| 466 | * features - {Array({<OpenLayers.Feature.Vector>})} |
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| 467 | * options - {Object} Object whose possible keys are "create", "update", |
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| 468 | * "delete", "callback" and "scope", the values referenced by the |
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| 469 | * first three are objects as passed to the "create", "update", and |
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| 470 | * "delete" methods, the value referenced by the "callback" key is |
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| 471 | * a function which is called when the commit operation is complete |
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| 472 | * using the scope referenced by the "scope" key. |
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| 473 | * |
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| 474 | * Returns: |
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| 475 | * {Array({<OpenLayers.Protocol.Response>})} An array of |
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| 476 | * <OpenLayers.Protocol.Response> objects, one per request made |
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| 477 | * to the database. |
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| 478 | */ |
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| 479 | commit: function(features, options) { |
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| 480 | var opt, resp = [], nRequests = 0, nResponses = 0; |
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| 481 | |
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| 482 | function callback(resp) { |
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| 483 | if (++nResponses < nRequests) { |
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| 484 | resp.last = false; |
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| 485 | } |
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| 486 | this.callUserCallback(options, resp); |
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| 487 | } |
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| 488 | |
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| 489 | var feature, toCreate = [], toUpdate = [], toDelete = []; |
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| 490 | for (var i = features.length - 1; i >= 0; i--) { |
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| 491 | feature = features[i]; |
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| 492 | switch (feature.state) { |
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| 493 | case OpenLayers.State.INSERT: |
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| 494 | toCreate.push(feature); |
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| 495 | break; |
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| 496 | case OpenLayers.State.UPDATE: |
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| 497 | toUpdate.push(feature); |
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| 498 | break; |
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| 499 | case OpenLayers.State.DELETE: |
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| 500 | toDelete.push(feature); |
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| 501 | break; |
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| 502 | } |
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| 503 | } |
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| 504 | if (toCreate.length > 0) { |
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| 505 | nRequests++; |
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| 506 | opt = OpenLayers.Util.applyDefaults( |
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| 507 | {"callback": callback, "scope": this}, |
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| 508 | options.create |
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| 509 | ); |
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| 510 | resp.push(this.create(toCreate, opt)); |
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| 511 | } |
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| 512 | if (toUpdate.length > 0) { |
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| 513 | nRequests++; |
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| 514 | opt = OpenLayers.Util.applyDefaults( |
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| 515 | {"callback": callback, "scope": this}, |
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| 516 | options.update |
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| 517 | ); |
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| 518 | resp.push(this.update(toUpdate, opt)); |
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| 519 | } |
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| 520 | if (toDelete.length > 0) { |
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| 521 | nRequests++; |
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| 522 | opt = OpenLayers.Util.applyDefaults( |
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| 523 | {"callback": callback, "scope": this}, |
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| 524 | options["delete"] |
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| 525 | ); |
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| 526 | resp.push(this["delete"](toDelete, opt)); |
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| 527 | } |
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| 528 | |
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| 529 | return resp; |
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| 530 | }, |
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| 531 | |
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| 532 | /** |
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| 533 | * Method: clear |
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| 534 | * Removes all rows of the table. |
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| 535 | */ |
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| 536 | clear: function() { |
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| 537 | this.db.execute("DELETE FROM " + this.tableName); |
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| 538 | }, |
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| 539 | |
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| 540 | /** |
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| 541 | * Method: callUserCallback |
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| 542 | * This method is called from within commit each time a request is made |
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| 543 | * to the database, it is responsible for calling the user-supplied |
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| 544 | * callbacks. |
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| 545 | * |
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| 546 | * Parameters: |
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| 547 | * options - {Object} The map of options passed to the commit call. |
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| 548 | * resp - {<OpenLayers.Protocol.Response>} |
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| 549 | */ |
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| 550 | callUserCallback: function(options, resp) { |
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| 551 | var opt = options[resp.requestType]; |
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| 552 | if (opt && opt.callback) { |
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| 553 | opt.callback.call(opt.scope, resp); |
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| 554 | } |
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| 555 | if (resp.last && options.callback) { |
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| 556 | options.callback.call(options.scope); |
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| 557 | } |
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| 558 | }, |
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| 559 | |
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| 560 | CLASS_NAME: "OpenLayers.Protocol.SQL.Gears" |
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| 561 | }); |
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