svn-gvsig-desktop / trunk / org.gvsig.desktop / org.gvsig.desktop.library / org.gvsig.symbology / org.gvsig.symbology.lib / org.gvsig.symbology.lib.impl / src / main / java / org / gvsig / symbology / fmap / mapcontext / rendering / legend / styling / EvaluatorCreator.java @ 41196
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package org.gvsig.symbology.fmap.mapcontext.rendering.legend.styling; |
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import java.util.HashMap; |
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import java.util.Iterator; |
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import java.util.Map; |
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import org.gvsig.tools.evaluator.EvaluatorWithDescriptions; |
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import org.gvsig.tools.evaluator.sqljep.SQLJEPEvaluator; |
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/**
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*
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* Utility class to centralize the creation of an
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* @link {@link EvaluatorWithDescriptions}
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*
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* TODO Perhaps create a manager in Tools to perform this operation
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*
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* @author jldominguez
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*
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*/
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public class EvaluatorCreator { |
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private static Map<String, EvaluatorWithDescriptions> evCache = |
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new HashMap<String, EvaluatorWithDescriptions>(); |
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/**
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* Create an {@link EvaluatorWithDescriptions} that uses
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* the string expression provided
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*
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* @param expr
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* @return
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*/
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public static EvaluatorWithDescriptions getEvaluator(String expr) { |
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EvaluatorWithDescriptions resp = evCache.get(expr); |
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if (resp == null) { |
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resp = new SQLJEPEvaluator(expr);
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if (evCache.size() > 100) { |
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removeOne(evCache); |
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} |
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evCache.put(expr, resp); |
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} |
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return resp;
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} |
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private static void removeOne( |
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Map<String, EvaluatorWithDescriptions> themap) { |
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Iterator<String> iter = themap.keySet().iterator(); |
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int count = 50; |
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String k = null; |
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while (iter.hasNext() && count > 0) { |
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k = iter.next(); |
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count--; |
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} |
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themap.remove(k); |
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} |
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} |