root / branches / v2_0_0_prep / libraries / libFMap_daldb / src / org / gvsig / fmap / dal / store / jdbc / JDBCSetProvider.java @ 28424
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/* gvSIG. Geographic Information System of the Valencian Government
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*
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* Copyright (C) 2007-2008 Infrastructures and Transports Department
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* of the Valencian Government (CIT)
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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 2
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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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*/
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/*
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* AUTHORS (In addition to CIT):
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* 2009 IVER T.I {{Task}}
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*/
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/**
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*
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*/
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package org.gvsig.fmap.dal.store.jdbc; |
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import java.util.ArrayList; |
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import java.util.Iterator; |
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import java.util.List; |
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import java.util.NoSuchElementException; |
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import org.gvsig.fmap.dal.exception.DataException; |
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import org.gvsig.fmap.dal.feature.DisposableIterator; |
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import org.gvsig.fmap.dal.feature.FeatureQuery; |
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import org.gvsig.fmap.dal.feature.FeatureQueryOrder; |
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import org.gvsig.fmap.dal.feature.FeatureType; |
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import org.gvsig.fmap.dal.feature.FeatureQueryOrder.FeatureQueryOrderMember; |
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import org.gvsig.fmap.dal.feature.spi.FeatureSetProvider; |
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import org.gvsig.tools.evaluator.Evaluator; |
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import org.slf4j.Logger; |
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import org.slf4j.LoggerFactory; |
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/**
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* @author jmvivo
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*
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*/
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public abstract class JDBCSetProvider implements FeatureSetProvider { |
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final static private Logger logger = LoggerFactory |
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.getLogger(JDBCSetProvider.class); |
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protected JDBCStoreProvider store;
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protected FeatureQuery query;
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protected FeatureType featureType;
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protected String filter; |
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protected String order; |
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protected Long size = null; |
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protected Boolean isEmpty = null; |
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protected List resultSetIDReferenced; |
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public JDBCSetProvider(JDBCStoreProvider store, FeatureQuery query,
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FeatureType featureType) throws DataException {
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this.store = store;
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this.query = query;
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this.featureType = featureType;
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this.resultSetIDReferenced = new ArrayList(); |
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if (query.hasFilter() && this.canFilter()) { |
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setFilter(query.getFilter()); |
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} else {
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setFilter(null);
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} |
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if (query.hasOrder() && canOrder()) {
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setOrder(query.getOrder()); |
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} else {
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setOrder(null);
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} |
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} |
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protected abstract String getSqlForEvaluator(Evaluator evaluator); |
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protected abstract String getEscapedFieldName(String fieldName); |
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protected void setOrder(FeatureQueryOrder order) { |
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if (order == null || order.size() == 0) { |
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this.order = null; |
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return;
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} |
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StringBuilder buffer = new StringBuilder(); |
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Iterator iter = order.iterator();
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FeatureQueryOrderMember menber; |
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while (true) { |
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menber = (FeatureQueryOrderMember) iter.next(); |
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if (menber.hasEvaluator()) {
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buffer.append(getSqlForEvaluator(menber.getEvaluator())); |
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} else {
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buffer.append(getEscapedFieldName(menber.getAttributeName())); |
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} |
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if (menber.getAscending()) {
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buffer.append(" ASC");
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} else {
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buffer.append(" DESC");
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} |
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if (iter.hasNext()) {
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buffer.append(", ");
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} else {
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buffer.append(' ');
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break;
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} |
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} |
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this.order = buffer.toString();
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} |
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protected void setFilter(Evaluator filter) { |
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this.filter = getSqlForEvaluator(filter);
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} |
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/* (non-Javadoc)
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* @see org.gvsig.fmap.dal.feature.spi.FeatureSetProvider#canFilter()
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*/
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public boolean canFilter() { |
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Evaluator filter = query.getFilter(); |
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if (filter != null) { |
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if (filter.getCQL() == null || filter.getCQL().length() == 0) { |
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return false; |
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} else {
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// TODO Check Geom fields if postgis not are available
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return true; |
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} |
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} else{
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return false; |
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} |
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} |
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/* (non-Javadoc)
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* @see org.gvsig.fmap.dal.feature.spi.FeatureSetProvider#canIterateFromIndex()
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*/
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public abstract boolean canIterateFromIndex(); |
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/* (non-Javadoc)
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* @see org.gvsig.fmap.dal.feature.spi.FeatureSetProvider#canOrder()
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*/
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public boolean canOrder() { |
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// TODO Check Geom fields if postgis not are available
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if (query.hasOrder()) {
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Iterator iter = query.getOrder().iterator();
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FeatureQueryOrderMember menber; |
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String cql;
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while (iter.hasNext()){
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menber = (FeatureQueryOrderMember) iter.next(); |
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if (menber.hasEvaluator()){
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cql =menber.getEvaluator().getCQL(); |
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if (cql == null || cql.length() == 0) { |
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return false; |
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} |
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} |
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} |
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} |
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return true; |
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} |
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public void dispose() { |
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if (resultSetIDReferenced != null) { |
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Iterator iter = resultSetIDReferenced.iterator();
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Integer resID;
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while (iter.hasNext()) {
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resID = (Integer) iter.next();
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if (resID != null) { |
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logger.warn( |
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"ResultSet (ID {}) not closed on dispose, will close",
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resID); |
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try {
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this.store.closeResulset(resID.intValue());
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} catch (DataException e) {
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logger.error("Close resulset Exception", e);
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} |
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} |
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iter.remove(); |
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} |
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} |
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resultSetIDReferenced = null;
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store = null;
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query = null;
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featureType = null;
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filter = null;
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order = null;
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size = null;
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isEmpty = null;
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} |
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/*
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* (non-Javadoc)
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*
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* @see org.gvsig.fmap.dal.feature.spi.FeatureSetProvider#fastIterator()
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*/
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public DisposableIterator fastIterator() throws DataException { |
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return this.fastIterator(0); |
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} |
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/*
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* (non-Javadoc)
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*
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* @see org.gvsig.fmap.dal.feature.spi.FeatureSetProvider#fastIterator(long)
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*/
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public DisposableIterator fastIterator(long index) throws DataException { |
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if (isEmpty != null && isEmpty.booleanValue()) { |
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return new EmptyJDBCIterator(); |
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} |
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JDBCIterator iter = createFastIterartor(index); |
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return iter;
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} |
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protected abstract JDBCIterator createFastIterartor(long index) |
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throws DataException;
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protected JDBCIterator createDefaultFastIterartor(int resultSetID) |
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throws DataException {
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return new JDBCFastIterator(store, this, featureType, resultSetID); |
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} |
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/* (non-Javadoc)
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* @see org.gvsig.fmap.dal.feature.spi.FeatureSetProvider#getSize()
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*/
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public long getSize() throws DataException { |
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if (size == null) { |
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size = new Long(store.getCount(filter)); |
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} |
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return size.longValue();
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} |
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/* (non-Javadoc)
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* @see org.gvsig.fmap.dal.feature.spi.FeatureSetProvider#isEmpty()
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*/
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public boolean isEmpty() throws DataException { |
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if (isEmpty == null) { |
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if (size == null) { |
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String sql = store
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.compoundSelect(featureType, filter, null, 1, |
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0);
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int rsID = store.createResultSet(sql);
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isEmpty = new Boolean(store.resulsetNext(rsID)); |
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store.closeResulset(rsID); |
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} else {
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isEmpty = new Boolean(size.longValue() < 1); |
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} |
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} |
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return isEmpty.booleanValue();
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} |
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/* (non-Javadoc)
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* @see org.gvsig.fmap.dal.feature.spi.FeatureSetProvider#iterator()
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*/
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public DisposableIterator iterator() throws DataException { |
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return iterator(0); |
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} |
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/* (non-Javadoc)
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* @see org.gvsig.fmap.dal.feature.spi.FeatureSetProvider#iterator(long)
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*/
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public DisposableIterator iterator(long index) throws DataException { |
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if (isEmpty != null && isEmpty.booleanValue()) { |
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return new EmptyJDBCIterator(); |
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} |
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JDBCIterator iter = createIterator(index); |
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return iter;
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} |
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protected abstract JDBCIterator createIterator(long index) |
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throws DataException;
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protected JDBCIterator createDefaultIterartor(int resultSetID) |
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throws DataException {
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return new JDBCIterator(store, this, featureType, resultSetID); |
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} |
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private class EmptyJDBCIterator extends JDBCIterator { |
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protected EmptyJDBCIterator() throws DataException { |
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super(null, null, null, -1); |
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} |
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public boolean hasNext() { |
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return false; |
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} |
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public Object next() { |
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throw new NoSuchElementException(); |
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} |
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public void dispose() { |
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} |
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} |
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public void addResulsetReference(int resulsetID) { |
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this.resultSetIDReferenced.add(new Integer(resulsetID)); |
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} |
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public void removeResulsetReference(int resulsetID) { |
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this.resultSetIDReferenced.remove(new Integer(resulsetID)); |
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} |
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} |