svn-gvsig-desktop / trunk / org.gvsig.desktop / org.gvsig.desktop.compat.cdc / org.gvsig.fmap.dal / org.gvsig.fmap.dal.impl / src / main / java / org / gvsig / fmap / dal / feature / impl / DefaultFeatureComparator.java @ 40435
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package org.gvsig.fmap.dal.feature.impl; |
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import java.util.Comparator; |
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import java.util.Iterator; |
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import org.gvsig.fmap.dal.exception.DataEvaluatorRuntimeException; |
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import org.gvsig.fmap.dal.feature.Feature; |
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import org.gvsig.fmap.dal.feature.FeatureQueryOrder; |
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import org.gvsig.tools.evaluator.Evaluator; |
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import org.gvsig.tools.evaluator.EvaluatorData; |
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import org.gvsig.tools.evaluator.EvaluatorException; |
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public class DefaultFeatureComparator implements Comparator { |
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private FeatureQueryOrder order;
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public DefaultFeatureComparator(FeatureQueryOrder order) {
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this.order = order;
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// TODO optimizar en un array???
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} |
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private int myCompare(Object arg0, Object arg1) { |
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if (arg0 == null){ |
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if (arg1 == null){ |
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return 0; |
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} else{
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return 1; |
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} |
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} else if (arg1 == null){ |
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if (arg0 == null) { |
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return 0; |
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} else {
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return 1; |
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} |
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} |
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if (arg0 instanceof Comparable) { |
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return ((Comparable) arg0).compareTo(arg1); |
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} else if (arg1 instanceof Comparable) { |
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return ((Comparable) arg1).compareTo(arg0) * -1; |
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} |
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if (arg0.equals(arg1)){
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return 0; |
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} else{
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return -1; |
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} |
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} |
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public int compare(Object arg0, Object arg1) { |
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Iterator iter = this.order.iterator(); |
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int returnValue = 0; |
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Feature f0 = (Feature) arg0; |
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Feature f1 = (Feature) arg1; |
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Object item;
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String attrName;
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Evaluator evaluator; |
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while (returnValue == 0 && iter.hasNext()) { |
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item = iter.next(); |
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if (item instanceof String) { |
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attrName = (String) item;
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returnValue = this
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.myCompare(f0.get(attrName), f1 |
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.get(attrName)); |
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} else {
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evaluator = (Evaluator) item; |
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try {
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returnValue = this.myCompare(evaluator
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.evaluate((EvaluatorData) f0), evaluator |
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.evaluate((EvaluatorData) f1)); |
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} catch (EvaluatorException e) {
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throw new DataEvaluatorRuntimeException(e); |
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} |
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} |
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} |
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return returnValue;
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} |
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} |