/* Copyright (c) 2001 - 2007 TOPP - www.openplans.org. All rights reserved.
* This code is licensed under the GPL 2.0 license, availible at the root
* application directory.
*/
package org.geoserver.feature;
import com.vividsolutions.jts.geom.Envelope;
import org.geotools.data.DataUtilities;
import org.geotools.data.store.DataFeatureCollection;
import org.geotools.feature.FeatureCollection;
import org.geotools.geometry.jts.ReferencedEnvelope;
import org.opengis.feature.simple.SimpleFeature;
import org.opengis.feature.simple.SimpleFeatureType;
import org.opengis.filter.identity.FeatureId;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;
/**
* Wraps multiple feature collections into a single.
*
* @author Justin Deoliveira, The Open Planning Project
*
*/
public class CompositeFeatureCollection extends DataFeatureCollection {
/**
* wrapped collecitons
*/
List collections;
public CompositeFeatureCollection(List collections) {
this.collections = collections;
}
protected Iterator openIterator() throws IOException {
return new CompositeIterator();
}
public SimpleFeatureType getSchema() {
return null;
}
public ReferencedEnvelope getBounds() {
return ReferencedEnvelope.reference(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 {
int index;
Iterator 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) {
((FeatureCollection) collections.get(index - 1)).close(iterator);
}
//grap next
iterator = ((FeatureCollection) collections.get(index++)).iterator();
if (iterator.hasNext()) {
return true;
}
}
//no more
if (iterator != null) {
//close the last iterator
((FeatureCollection) collections.get(collections.size() - 1)).close(iterator);
}
return false;
}
public Object next() {
return 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 boolean removeAll(Collection arg0) {
Iterator it = collections.iterator();
boolean result = false;
while (it.hasNext()){
FeatureCollection col = (FeatureCollection)it.next();
result |= col.removeAll(arg0);
}
return result;
}
public boolean retainAll(Collection arg0) {
boolean result = false;
Iterator it = collections.iterator();
while (it.hasNext()){
FeatureCollection col = (FeatureCollection)it.next();
result |= col.removeAll(arg0);
}
return result;
}
public Object[] toArray(Object[] arg0) {
List list = new ArrayList();
Iterator it = collections.iterator();
while(it.hasNext()){
FeatureCollection col = (FeatureCollection)it.next();
Iterator it2 = col.iterator();
while (it2.hasNext()){
list.add(it.next());
}
col.close(it2);
}
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.");
}
}