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 / featureset / FeatureProviderComparator.java @ 40435
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package org.gvsig.fmap.dal.feature.impl.featureset; |
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import java.util.Comparator; |
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import java.util.Iterator; |
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import org.gvsig.compat.CompatLocator; |
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import org.gvsig.fmap.dal.exception.DataEvaluatorRuntimeException; |
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import org.gvsig.fmap.dal.feature.FeatureQueryOrder; |
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import org.gvsig.fmap.dal.feature.FeatureQueryOrder.FeatureQueryOrderMember; |
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import org.gvsig.fmap.dal.feature.FeatureType; |
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import org.gvsig.fmap.dal.feature.impl.DefaultFeature; |
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import org.gvsig.fmap.dal.feature.impl.DefaultFeatureStore; |
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import org.gvsig.fmap.dal.feature.spi.FeatureProvider; |
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import org.gvsig.tools.evaluator.Evaluator; |
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import org.gvsig.tools.evaluator.EvaluatorException; |
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/*
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*
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* Compara dos Feature o FeatureProvider.
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*/
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public class FeatureProviderComparator implements Comparator { |
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private FeatureQueryOrder order;
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private DefaultFeature f1;
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private DefaultFeature f2;
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private DefaultFeatureStore store;
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private OrderElement[] elements = null; |
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private class OrderElement { |
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FeatureQueryOrderMember order = null;
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int fieldIndex = -1; |
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} |
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public FeatureProviderComparator(DefaultFeatureStore store, FeatureQueryOrder order) {
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this.order = order;
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this.store = store;
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this.f1 = new DefaultFeature(this.store); |
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this.f2 = new DefaultFeature(this.store); |
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} |
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private void initElements(FeatureType type) { |
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elements = new OrderElement[this.order.size()]; |
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OrderElement cur; |
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Iterator iter = order.iterator();
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FeatureQueryOrderMember orderItem; |
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int i = 0; |
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while (iter.hasNext()) {
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cur = new OrderElement();
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cur.order = (FeatureQueryOrderMember) iter.next(); |
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if (!cur.order.hasEvaluator()) {
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cur.fieldIndex = type.getIndex(cur.order.getAttributeName()); |
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} |
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elements[i] = cur; |
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i++; |
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} |
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} |
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public int compare(Object arg0, Object arg1) { |
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FeatureQueryOrderMember order; |
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Comparable v1;
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Comparable v2;
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Object o1;
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Object o2;
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int v;
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int fieldIndex;
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f1.setData((FeatureProvider) arg0); |
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f2.setData((FeatureProvider) arg1); |
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if (elements == null){ |
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initElements(f1.getType()); |
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} |
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OrderElement element; |
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for (int i = 0; i < elements.length; i++) { |
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element = elements[i]; |
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if (element.order.hasEvaluator()) {
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Evaluator evaluator = element.order.getEvaluator(); |
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try {
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o1 = evaluator.evaluate(f1); |
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o2 = evaluator.evaluate(f2); |
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} catch (EvaluatorException e) {
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throw new DataEvaluatorRuntimeException(e); |
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} |
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} else {
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o1 = f1.get(element.fieldIndex); |
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o2 = f2.get(element.fieldIndex); |
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} |
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if (o1 == null) { |
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if (o2 == null) { |
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return 0; |
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} else {
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v = 1;
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} |
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} else {
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if (o1 instanceof String && o2 instanceof String) { |
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v = CompatLocator.getStringUtils().compare((String) o1,
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(String) o2, true); |
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} |
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else if (o1 instanceof Comparable && o2 instanceof Comparable) { |
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v1 = (Comparable) o1;
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v2 = (Comparable) o2;
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v = v1.compareTo(v2); |
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} else {
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v = -1;
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} |
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} |
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if (v != 0) { |
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if (element.order.getAscending()) {
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return v;
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} else {
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return -v;
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} |
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} |
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} |
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return 0; |
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} |
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} |