Revision 44662 trunk/org.gvsig.desktop/org.gvsig.desktop.plugin/org.gvsig.labeling.app/org.gvsig.labeling.app.mainplugin/src/main/java/org/gvsig/labeling/lang/EvaluatorCreator.java
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package org.gvsig.labeling.lang; |
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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.apache.commons.collections.map.LRUMap; |
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import org.gvsig.fmap.dal.DALLocator; |
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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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private static final Map<String, EvaluatorWithDescriptions> EVALUATORS_CACHE = new LRUMap(100); |
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/** |
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* Create an {@link EvaluatorWithDescriptions} that uses
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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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EvaluatorWithDescriptions resp = EVALUATORS_CACHE.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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try {
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resp = (EvaluatorWithDescriptions) DALLocator.getDataManager().createFilter(expr); |
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} catch (Exception ex) {
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throw new RuntimeException("Can't create evaluator for '"+expr+"'.", ex);
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} |
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EVALUATORS_CACHE.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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} |
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