/* 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 org.geotools.data.DataUtilities;
import org.geotools.data.FeatureReader;
import org.geotools.data.FeatureWriter;
import org.geotools.feature.FeatureCollection;
import org.geotools.feature.FeatureIterator;
import org.geotools.feature.IllegalAttributeException;
import org.geotools.feature.collection.DelegateFeatureIterator;
import org.geotools.feature.simple.SimpleFeatureBuilder;
import org.geotools.filter.identity.FeatureIdImpl;
import org.opengis.feature.simple.SimpleFeature;
import org.opengis.feature.simple.SimpleFeatureType;
import org.opengis.feature.type.AttributeDescriptor;
import org.opengis.filter.identity.FeatureId;
import java.io.IOException;
import java.util.Iterator;
import java.util.NoSuchElementException;
/**
* FeatureCollection with "casts" features from on feature type to another.
*
* @author Justin Deoliveira, The Open Planning Project, jdeolive@openplans.org
*
*/
public class RetypingFeatureCollection extends DecoratingFeatureCollection {
SimpleFeatureType target;
public RetypingFeatureCollection(FeatureCollection<SimpleFeatureType, SimpleFeature> delegate,
SimpleFeatureType target) {
super(delegate);
this.target = target;
}
public SimpleFeatureType getSchema() {
return target;
}
public Iterator<SimpleFeature> iterator() {
return new RetypingIterator(delegate.iterator(), target);
}
public void close(Iterator<SimpleFeature> iterator) {
RetypingIterator retyping = (RetypingIterator) iterator;
delegate.close(retyping.delegate);
}
public FeatureIterator<SimpleFeature> features() {
return new DelegateFeatureIterator<SimpleFeature>(this, iterator());
}
public void close(FeatureIterator<SimpleFeature> iterator) {
DelegateFeatureIterator<SimpleFeature> delegate = (DelegateFeatureIterator<SimpleFeature>) iterator;
delegate.close();
}
static SimpleFeature retype(SimpleFeature source, SimpleFeatureBuilder builder)
throws IllegalAttributeException {
SimpleFeatureType target = builder.getFeatureType();
for (int i = 0; i < target.getAttributeCount(); i++) {
AttributeDescriptor attributeType = target.getDescriptor(i);
Object value = null;
if (source.getFeatureType().getDescriptor(attributeType.getName()) != null) {
value = source.getAttribute(attributeType.getName());
}
builder.add(value);
}
FeatureId id = reTypeId(source.getIdentifier(), source.getFeatureType(), target);
return builder.buildFeature(id.getID());
}
/**
* Given a feature id following the <typename>.<internalId> convention, the
* original type and the destination type, this converts the id from
* <original>.<internalid> to <target>.<internalid>
*
* @param id
* @param original
* @param target
* @return
*/
public static FeatureId reTypeId(FeatureId sourceId, SimpleFeatureType original,
SimpleFeatureType target) {
final String originalTypeName = original.getName().getLocalPart();
final String destTypeName = target.getName().getLocalPart();
if (destTypeName.equals(originalTypeName))
return sourceId;
final String prefix = originalTypeName + ".";
if (sourceId.getID().startsWith(prefix)) {
return new FeatureIdImpl(destTypeName + "." + sourceId.getID().substring(prefix.length()));
} else
return sourceId;
}
public static class RetypingIterator implements Iterator<SimpleFeature> {
SimpleFeatureBuilder builder;
Iterator<SimpleFeature> delegate;
public RetypingIterator(Iterator<SimpleFeature> delegate, SimpleFeatureType target) {
this.delegate = delegate;
this.builder = new SimpleFeatureBuilder(target);
}
public boolean hasNext() {
return delegate.hasNext();
}
public SimpleFeature next() {
try {
return RetypingFeatureCollection.retype(delegate.next(), builder);
} catch (IllegalAttributeException e) {
throw new RuntimeException(e);
}
}
public void remove() {
delegate.remove();
}
}
public static class RetypingFeatureReader implements
FeatureReader<SimpleFeatureType, SimpleFeature> {
FeatureReader<SimpleFeatureType, SimpleFeature> delegate;
SimpleFeatureBuilder builder;
public RetypingFeatureReader(FeatureReader<SimpleFeatureType, SimpleFeature> delegate,
SimpleFeatureType target) {
this.delegate = delegate;
this.builder = new SimpleFeatureBuilder(target);
}
public void close() throws IOException {
delegate.close();
delegate = null;
builder = null;
}
public SimpleFeatureType getFeatureType() {
return builder.getFeatureType();
}
public boolean hasNext() throws IOException {
return delegate.hasNext();
}
public SimpleFeature next() throws IOException, IllegalAttributeException,
NoSuchElementException {
return RetypingFeatureCollection.retype(delegate.next(), builder);
}
}
public static class RetypingFeatureWriter implements
FeatureWriter<SimpleFeatureType, SimpleFeature> {
FeatureWriter<SimpleFeatureType, SimpleFeature> delegate;
SimpleFeatureBuilder builder;
private SimpleFeature current;
private SimpleFeature retyped;
public RetypingFeatureWriter(FeatureWriter<SimpleFeatureType, SimpleFeature> delegate,
SimpleFeatureType target) {
this.delegate = delegate;
this.builder = new SimpleFeatureBuilder(target);
}
public void close() throws IOException {
delegate.close();
delegate = null;
builder = null;
}
public SimpleFeatureType getFeatureType() {
return builder.getFeatureType();
}
public boolean hasNext() throws IOException {
return delegate.hasNext();
}
public SimpleFeature next() throws IOException {
try {
current = delegate.next();
retyped = RetypingFeatureCollection.retype(current, builder);
return retyped;
} catch (IllegalAttributeException e) {
throw (IOException) new IOException("Error occurred while retyping feature")
.initCause(e);
}
}
public void remove() throws IOException {
delegate.write();
}
public void write() throws IOException {
try {
SimpleFeatureType target = getFeatureType();
for (int i = 0; i < target.getAttributeCount(); i++) {
AttributeDescriptor at = target.getDescriptor(i);
Object value = retyped.getAttribute(i);
current.setAttribute(at.getLocalName(), value);
}
delegate.write();
} catch (IllegalAttributeException e) {
throw (IOException) new IOException("Error occurred while retyping feature")
.initCause(e);
}
}
}
}