SQL.js
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/* Copyright (c) 2006-2011 by OpenLayers Contributors (see authors.txt for
* full list of contributors). Published under the Clear BSD license.
* See http://svn.openlayers.org/trunk/openlayers/license.txt for the
* full text of the license. */
/**
* @requires OpenLayers/Protocol.js
*/
/**
* Class: OpenLayers.Protocol.SQL
* Abstract SQL protocol class. Not to be instantiated directly. Use
* one of the SQL protocol subclasses instead.
*
* Inherits from:
* - <OpenLayers.Protocol>
*/
OpenLayers.Protocol.SQL = OpenLayers.Class(OpenLayers.Protocol, {
/**
* APIProperty: databaseName
* {String}
*/
databaseName: 'ol',
/**
* APIProperty: tableName
* Name of the database table into which Features should be saved.
*/
tableName: "ol_vector_features",
/**
* Property: postReadFiltering
* {Boolean} Whether the filter (if there's one) must be applied after
* the features have been read from the database; for example the
* BBOX strategy passes the read method a BBOX spatial filter, if
* postReadFiltering is true every feature read from the database
* will go through the BBOX spatial filter, which can be costly;
* defaults to true.
*/
postReadFiltering: true,
/**
* Constructor: OpenLayers.Protocol.SQL
*/
initialize: function(options) {
OpenLayers.Protocol.prototype.initialize.apply(this, [options]);
},
/**
* APIMethod: destroy
* Clean up the protocol.
*/
destroy: function() {
OpenLayers.Protocol.prototype.destroy.apply(this);
},
/**
* APIMethod: supported
* This should be overridden by specific subclasses
*
* Returns:
* {Boolean} Whether or not the browser supports the SQL backend
*/
supported: function() {
return false;
},
/**
* Method: evaluateFilter
* If postReadFiltering is true evaluate the filter against the feature
* and return the result of the evaluation, otherwise return true.
*
* Parameters:
* {<OpenLayers.Feature.Vector>} The feature.
* {<OpenLayers.Filter>} The filter.
*
* Returns:
* {Boolean} true if postReadFiltering if false, the result of the
* filter evaluation otherwise.
*/
evaluateFilter: function(feature, filter) {
return filter && this.postReadFiltering ?
filter.evaluate(feature) : true;
},
CLASS_NAME: "OpenLayers.Protocol.SQL"
});