1faf641806
git-svn-id: http://svn.openlayers.org/trunk/openlayers@5978 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
101 lines
2.8 KiB
JavaScript
101 lines
2.8 KiB
JavaScript
/* Copyright (c) 2006 MetaCarta, Inc., published under a modified BSD license.
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* See http://svn.openlayers.org/trunk/openlayers/repository-license.txt
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* for the full text of the license. */
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/**
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* @requires OpenLayers/Util.js
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* @requires OpenLayers/Style.js
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*/
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/**
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* Class: OpenLayers.Rule
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* This class represents a OGC Rule, as being used for rule-based SLD styling.
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*/
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OpenLayers.Rule = OpenLayers.Class({
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/**
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* APIProperty: name
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* {String} name of this rule
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*/
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name: 'default',
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/**
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* Property: elseFilter
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* {Boolean} Determines whether this rule is only to be applied only if
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* no other rules match (ElseFilter according to the SLD specification).
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* Default is false. For instances of OpenLayers.Rule, if elseFilter is
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* false, the rule will always apply. For subclasses, the else property is
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* ignored.
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*/
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elseFilter: false,
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/**
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* Property: symbolizer
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* {Object} Hash of styles for this rule. Contains hashes of feature
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* styles. Keys are one or more of ["Point", "Line", "Polygon"]
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*/
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symbolizer: null,
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/**
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* APIProperty: minScaleDenominator
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* {Number} or {String} minimum scale at which to draw the feature.
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* In the case of a String, this can be a combination of text and
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* propertyNames in the form "literal ${propertyName}"
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*/
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minScaleDenominator: null,
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/**
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* APIProperty: maxScaleDenominator
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* {Number} or {String} maximum scale at which to draw the feature.
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* In the case of a String, this can be a combination of text and
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* propertyNames in the form "literal ${propertyName}"
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*/
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maxScaleDenominator: null,
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/**
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* Constructor: OpenLayers.Rule
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* Creates a Rule.
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*
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* Parameters:
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* options - {Object} An optional object with properties to set on the
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* rule
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*
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* Returns:
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* {<OpenLayers.Rule>}
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*/
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initialize: function(options) {
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this.symbolizer = {};
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OpenLayers.Util.extend(this, options);
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},
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/**
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* APIMethod: destroy
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* nullify references to prevent circular references and memory leaks
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*/
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destroy: function() {
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for (var i in this.symbolizer) {
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this.symbolizer[i] = null;
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}
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this.symbolizer = null;
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},
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/**
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* APIMethod: evaluate
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* evaluates this rule for a specific feature
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*
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* Parameters:
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* feature - {<OpenLayers.Feature>} feature to apply the rule to.
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*
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* Returns:
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* {boolean} true if the rule applies, false if it does not.
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* This rule is the default rule and always returns true.
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*/
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evaluate: function(feature) {
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// Default rule always applies. Subclasses will want to override this.
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return true;
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},
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CLASS_NAME: "OpenLayers.Rule"
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}); |