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
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/**
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* gvSIG. Desktop Geographic Information System.
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*
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* Copyright (C) 2007-2013 gvSIG Association.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 3
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*
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* For any additional information, do not hesitate to contact us
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* at info AT gvsig.com, or visit our website www.gvsig.com.
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*/
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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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} |