Add optional context property to OpenLayers.Rule, so rules can now be evaluated against diffent contexts than feature.attributes. This changeset also renames Rule.Logical.children to Rule.Logical.rules, to make it more consistent with OL.Style. r=crschmidt (closes #1331)
git-svn-id: http://svn.openlayers.org/trunk/openlayers@6116 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf
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ahocevar
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@@ -1,101 +1,141 @@
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/* 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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/* 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: context
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* {Object} An optional object with properties that the rule and its
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* symbolizers' property values should be evaluatad against. If no
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* context is specified, feature.attributes will be used
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*/
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context: null,
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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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var context = this.getContext(feature);
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var applies = true;
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if (this.minScaleDenominator || this.maxScaleDenominator) {
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var scale = feature.layer.map.getScale();
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}
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// check if within minScale/maxScale bounds
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if (this.minScaleDenominator) {
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applies = scale >= OpenLayers.Style.createLiteral(
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this.minScaleDenominator, context);
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}
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if (applies && this.maxScaleDenominator) {
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applies = scale < OpenLayers.Style.createLiteral(
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this.maxScaleDenominator, context);
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}
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return applies;
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},
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/**
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* Method: getContext
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* Gets the context for evaluating this rule
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*
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* Paramters:
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* feature - {<OpenLayers.Feature>} feature to take the context from if
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* none is specified.
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*/
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getContext: function(feature) {
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var context = this.context;
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if (!context) {
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context = feature.attributes || feature.data;
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}
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return context;
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},
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CLASS_NAME: "OpenLayers.Rule"
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});
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