/*
* GeoTools - The Open Source Java GIS Toolkit
* http://geotools.org
*
* (C) 2002-2008, 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.wfs;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
import org.geotools.data.DataUtilities;
import org.geotools.data.store.DataFeatureCollection;
import org.geotools.feature.FeatureCollection;
import org.geotools.feature.FeatureIterator;
import org.geotools.geometry.jts.ReferencedEnvelope;
import org.opengis.feature.simple.SimpleFeature;
import org.opengis.feature.simple.SimpleFeatureType;
import org.opengis.filter.identity.FeatureId;
/**
* Wraps multiple feature collections into a single.
* <p>
* This feature collection is used for wfs feature collections which can be made
* up of features from different schemas.
* </p>
*
* @author Justin Deoliveira, The Open Planning Project
*
*
*
*
* @source $URL$
*/
public class CompositeFeatureCollection extends DataFeatureCollection {
/**
* wrapped collecitons
*/
List<FeatureCollection> collections;
public CompositeFeatureCollection(List<FeatureCollection> collections) {
this.collections = collections;
}
protected Iterator<SimpleFeature> openIterator() throws IOException {
return new CompositeIterator();
}
public SimpleFeatureType getSchema() {
return null;
}
public ReferencedEnvelope getBounds() {
return DataUtilities.bounds(this);
}
public int getCount() throws IOException {
int count = 0;
Iterator i = iterator();
try {
while (i.hasNext()) {
i.next();
count++;
}
} finally {
close(i);
}
return count;
}
class CompositeIterator implements Iterator<SimpleFeature> {
int index;
FeatureIterator iterator;
public CompositeIterator() {
index = 0;
}
public void remove() {
}
public boolean hasNext() {
//is there a current iterator that has another element
if ((iterator != null) && iterator.hasNext()) {
return true;
}
//get the next iterator
while (index < collections.size()) {
//close current before we move to next
if (iterator != null) {
iterator.close();
}
//grap next
iterator = ((FeatureCollection) collections.get(index++)).features();
if (iterator.hasNext()) {
return true;
}
}
//no more
if (iterator != null) {
//close the last iterator
iterator.close();
}
return false;
}
public SimpleFeature next() {
return (SimpleFeature) iterator.next();
}
}
public boolean addAll(Collection arg0) {
throw new RuntimeException("Can't add to a composite featurecollection; you need to add to one of the constituent collections direclty.");
}
public <T> T[] toArray(T[] arg0) {
List<T> list = new ArrayList<T>();
Iterator it = collections.iterator();
while(it.hasNext()){
FeatureCollection col = (FeatureCollection)it.next();
FeatureIterator it2 = col.features();
try {
while (it2.hasNext()){
list.add((T)it.next());
}
}
finally {
it2.close();
}
}
return list.toArray(arg0);
}
public FeatureId getIdentifier() {
throw new RuntimeException("Can't get the id for a composite featurecollection; you need to identify the consituent collections directly.");
}
}