root / branches / v2_0_0_prep / libraries / libFMap_daldb / src / org / gvsig / fmap / dal / store / jdbc / JDBCSetProvider.java @ 33331
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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.Arrays; |
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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.DataTypes; |
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import org.gvsig.fmap.dal.exception.DataException; |
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import org.gvsig.fmap.dal.feature.FeatureAttributeDescriptor; |
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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.AbstractFeatureSetProvider; |
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import org.gvsig.tools.evaluator.Evaluator; |
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import org.gvsig.tools.evaluator.EvaluatorFieldValue; |
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import org.gvsig.tools.evaluator.EvaluatorFieldsInfo; |
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import org.gvsig.tools.exception.BaseException; |
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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 class JDBCSetProvider extends AbstractFeatureSetProvider { |
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final static private Logger logger = LoggerFactory |
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.getLogger(JDBCSetProvider.class); |
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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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private JDBCHelper helper = null; |
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private int defaultFetchSize = 1000; |
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private long limit = -1l; |
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public JDBCSetProvider(JDBCStoreProvider store, FeatureQuery query,
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FeatureType featureType) throws DataException {
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super(store, query, featureType);
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this.helper = store.getHelper();
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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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if (query != null) { |
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limit = query.getLimit(); |
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} |
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} |
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/**
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* @return the defaultFetchSize
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*/
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public int getDefaultFetchSize() { |
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return defaultFetchSize;
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} |
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/**
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* @param defaultFetchSize
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* the defaultFetchSize to set
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*/
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public void setDefaultFetchSize(int defaultFetchSize) { |
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this.defaultFetchSize = defaultFetchSize;
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} |
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protected String getSqlForEvaluator(Evaluator filter) { |
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if (filter == null) { |
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return null; |
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} |
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EvaluatorFieldsInfo info = filter.getFieldsInfo(); |
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String filterString = filter.getSQL();
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if (info == null) { |
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return filterString;
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} |
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String[] filterNames = info.getFieldNames(); |
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String[] finalNames = new String[filterNames.length]; |
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EvaluatorFieldValue[] fValues;
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List values = new ArrayList(); |
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FeatureAttributeDescriptor attr; |
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for (int i = 0; i < filterNames.length; i++) { |
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attr = getFeatureType().getAttributeDescriptor(filterNames[i]); |
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if (attr == null) { |
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finalNames[i] = filterNames[i]; |
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continue;
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} |
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finalNames[i] = getEscapedFieldName(attr.getName()); |
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} |
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for (int i = 0; i < filterNames.length; i++) { |
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if (!filterNames[i].equals(finalNames[i])) {
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filterString.replaceAll("\\b" + filterNames[i] + "\\b", |
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finalNames[i]); |
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} |
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} |
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return filterString;
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} |
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protected String getEscapedFieldName(String fieldName) { |
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if (helper == null) { |
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helper = getJDBCStoreProvider().getHelper(); |
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} |
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return helper.escapeFieldName(fieldName);
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} |
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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 = getQuery().getFilter(); |
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if (filter != null) { |
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if (filter.getSQL() == null || filter.getSQL().length() == 0) { |
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return false; |
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} else {
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// TODO Check Geom fields if
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EvaluatorFieldsInfo fInfo = filter.getFieldsInfo(); |
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if (fInfo == null || fInfo.getFieldNames() == null) { |
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return true; |
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} |
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Iterator names = Arrays.asList(fInfo.getFieldNames()) |
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.iterator(); |
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String name;
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int type;
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while (names.hasNext()) {
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name = (String) names.next();
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type = |
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this.getFeatureType()
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.getAttributeDescriptor(name) |
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.getType(); |
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if (type == DataTypes.GEOMETRY
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&& !this.helper.supportsGeometry()) {
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return false; |
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} |
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} |
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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 boolean canIterateFromIndex() { |
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return helper.supportOffset();
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} |
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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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FeatureQuery query = getQuery(); |
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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 sql;
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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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sql = menber.getEvaluator().getSQL(); |
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if (sql == null || sql.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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private JDBCStoreProvider getJDBCStoreProvider() {
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return (JDBCStoreProvider) getStore();
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} |
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@Override
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protected void doDispose() throws BaseException { |
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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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getJDBCStoreProvider().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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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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protected String getSQL(long fromIndex) throws DataException { |
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return getJDBCStoreProvider().compoundSelect(getFeatureType(), filter,
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order, limit, fromIndex); |
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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(getJDBCStoreProvider().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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JDBCStoreProvider store = getJDBCStoreProvider(); |
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if (isEmpty == null) { |
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if (size == null) { |
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String sql =
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store.compoundSelect(getFeatureType(), filter, null, 1, |
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0);
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int rsID = store.createResultSet(sql, getFetchSize());
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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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protected int getFetchSize() { |
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long pageSize = -1; |
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if (getQuery() != null) { |
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pageSize = getQuery().getPageSize(); |
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pageSize = |
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pageSize > Integer.MAX_VALUE ? Integer.MAX_VALUE : pageSize; |
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} |
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return (pageSize > 0 ? (int) pageSize : defaultFetchSize); |
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} |
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protected JDBCIterator createFastIterator(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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int rsID =
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getJDBCStoreProvider().createResultSet(getSQL(index), |
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getFetchSize()); |
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return createDefaultFastIterator(rsID);
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} |
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protected JDBCIterator createDefaultFastIterator(int resultSetID) |
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throws DataException {
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return new JDBCFastIterator(getJDBCStoreProvider(), this, |
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getFeatureType(), resultSetID); |
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} |
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protected JDBCIterator createIterator(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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int rsID =
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getJDBCStoreProvider().createResultSet(getSQL(index), |
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getFetchSize()); |
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return createDefaultIterator(rsID);
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} |
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protected JDBCIterator createDefaultIterator(int resultSetID) |
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throws DataException {
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return new JDBCIterator(getJDBCStoreProvider(), this, getFeatureType(), |
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resultSetID); |
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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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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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@Override
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protected boolean internalHasNext() { |
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return false; |
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} |
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@Override
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protected Object internalNext() { |
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throw new NoSuchElementException(); |
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} |
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@Override
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protected void doDispose() throws BaseException { |
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// nothing to do
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} |
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} |
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} |