/*
* GeoTools - The Open Source Java GIS Toolkit
* http://geotools.org
*
* (C) 2008, Open Source Geospatial Foundation (OSGeo)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*/
package org.geotools.jdbc;
import java.io.IOException;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.NoSuchElementException;
import org.geotools.data.FeatureWriter;
import org.geotools.data.store.ContentEntry;
import org.geotools.data.store.ContentState;
import org.geotools.factory.Hints;
import org.geotools.geometry.jts.ReferencedEnvelope;
import org.opengis.feature.simple.SimpleFeature;
import org.opengis.feature.simple.SimpleFeatureType;
import org.opengis.feature.type.AttributeDescriptor;
import org.opengis.filter.Id;
/**
*
*
* @source $URL$
*/
public class JDBCUpdateFeatureWriter extends JDBCFeatureReader implements
FeatureWriter<SimpleFeatureType, SimpleFeature> {
ResultSetFeature last;
ReferencedEnvelope lastBounds;
public JDBCUpdateFeatureWriter(String sql, Connection cx,
JDBCFeatureSource featureSource, Hints hints) throws SQLException, IOException {
super(sql, cx, featureSource, featureSource.getSchema(), hints);
last = new ResultSetFeature( rs, cx );
}
public JDBCUpdateFeatureWriter(PreparedStatement ps, Connection cx,
JDBCFeatureSource featureSource, Hints hints) throws SQLException, IOException {
super(ps, cx, featureSource, featureSource.getSchema(), hints);
last = new ResultSetFeature( rs, ps.getConnection());
}
public SimpleFeature next() throws IOException, IllegalArgumentException,
NoSuchElementException {
ensureNext();
try {
last.init();
} catch (Exception e) {
e.printStackTrace();
}
//reset next flag
next = null;
if( this.featureSource.getEntry().getState(tx).hasListener() ){
// record bounds as we have a listener who will be interested
this.lastBounds = new ReferencedEnvelope( last.getBounds() );
}
return last;
}
public void remove() throws IOException {
try {
dataStore.delete(featureType, last.getID(), st.getConnection());
// issue notification
ContentEntry entry = featureSource.getEntry();
ContentState state = entry.getState( this.tx );
if( state.hasListener() ){
state.fireFeatureRemoved( featureSource, last );
}
} catch (SQLException e) {
throw (IOException) new IOException().initCause(e);
}
}
public void write() throws IOException {
try {
//figure out what the fid is
PrimaryKey key = dataStore.getPrimaryKey(featureType);
String fid = dataStore.encodeFID(key, rs);
Id filter = dataStore.getFilterFactory()
.id(Collections.singleton(dataStore.getFilterFactory()
.featureId(fid)));
//figure out which attributes changed
List<AttributeDescriptor> changed = new ArrayList<AttributeDescriptor>();
List<Object> values = new ArrayList<Object>();
for (AttributeDescriptor att : featureType.getAttributeDescriptors()) {
if (last.isDirrty(att.getLocalName())) {
changed.add(att);
values.add(last.getAttribute(att.getLocalName()));
}
}
// do the write
dataStore.update(featureType, changed, values, filter, st.getConnection());
// issue notification
ContentEntry entry = featureSource.getEntry();
ContentState state = entry.getState( this.tx );
if( state.hasListener() ){
state.fireFeatureUpdated( featureSource, last, lastBounds );
}
} catch (Exception e) {
throw (IOException) new IOException().initCause(e);
}
}
public void close() throws IOException {
super.close();
if ( last != null ) {
last.close();
last = null;
}
}
}