/*
* GeoTools - The Open Source Java GIS Toolkit
* http://geotools.org
*
* (C) 2003-2008, 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.data.crs;
import java.io.IOException;
import java.util.NoSuchElementException;
import org.geotools.data.FeatureReader;
import org.geotools.feature.FeatureTypes;
import org.geotools.feature.IllegalAttributeException;
import org.geotools.feature.SchemaException;
import org.geotools.feature.simple.SimpleFeatureBuilder;
import org.geotools.feature.simple.SimpleFeatureTypeBuilder;
import org.opengis.feature.simple.SimpleFeature;
import org.opengis.feature.simple.SimpleFeatureType;
import org.opengis.referencing.crs.CoordinateReferenceSystem;
/**
* ForceCoordinateSystemFeatureReader provides a CoordinateReferenceSystem for
* FeatureTypes.
*
* <p>
* ForceCoordinateSystemFeatureReader is a wrapper used to force
* GeometryAttributes to a user supplied CoordinateReferenceSystem rather then
* the default supplied by the DataStore.
* </p>
*
* <p>
* Example Use:
* <pre><code>
* ForceCoordinateSystemFeatureReader reader =
* new ForceCoordinateSystemFeatureReader( originalReader, forceCS );
*
* CoordinateReferenceSystem originalCS =
* originalReader.getFeatureType().getDefaultGeometry().getCoordianteSystem();
*
* CoordinateReferenceSystem newCS =
* reader.getFeatureType().getDefaultGeometry().getCoordianteSystem();
*
* assertEquals( forceCS, newCS );
* </code></pre>
* </p>
*
* @author jgarnett, Refractions Research, Inc.
* @author aaime
* @author $Author: jive $ (last modification)
* @source $URL$
* @version $Id$
*/
public class ForceCoordinateSystemFeatureReader implements FeatureReader<SimpleFeatureType, SimpleFeature> {
protected FeatureReader<SimpleFeatureType, SimpleFeature> reader;
protected SimpleFeatureBuilder builder;
/**
* Shortcut constructor that can be used if the new schema has already been computed
* @param reader
* @param schema
*/
ForceCoordinateSystemFeatureReader(FeatureReader<SimpleFeatureType, SimpleFeature> reader, SimpleFeatureType schema) {
this.reader = reader;
this.builder = new SimpleFeatureBuilder(schema);
}
/**
* Builds a new ForceCoordinateSystemFeatureReader
*
* @param reader
* @param cs
*
* @throws SchemaException
* @throws NullPointerException DOCUMENT ME!
* @throws IllegalArgumentException DOCUMENT ME!
*/
public ForceCoordinateSystemFeatureReader(FeatureReader<SimpleFeatureType, SimpleFeature> reader,
CoordinateReferenceSystem cs) throws SchemaException {
this(reader, cs, false);
}
/**
* Builds a new ForceCoordinateSystemFeatureReader
*
* @param reader
* @param cs
*
* @throws SchemaException
* @throws NullPointerException DOCUMENT ME!
* @throws IllegalArgumentException DOCUMENT ME!
*/
public ForceCoordinateSystemFeatureReader(FeatureReader<SimpleFeatureType, SimpleFeature> reader,
CoordinateReferenceSystem cs, boolean forceOnlyMissing) throws SchemaException {
if (cs == null) {
throw new NullPointerException("CoordinateSystem required");
}
SimpleFeatureType type = reader.getFeatureType();
CoordinateReferenceSystem originalCs = type.getCoordinateReferenceSystem();
if (!cs.equals(originalCs)) {
type = FeatureTypes.transform(type, cs, forceOnlyMissing);
}
this.builder = new SimpleFeatureBuilder(type);
this.reader = reader;
}
/**
* @see org.geotools.data.FeatureReader#getFeatureType()
*/
public SimpleFeatureType getFeatureType() {
if (reader == null) {
throw new IllegalStateException("Reader has already been closed");
}
if( builder == null )
return reader.getFeatureType();
return builder.getFeatureType();
}
/**
* @see org.geotools.data.FeatureReader#next()
*/
public SimpleFeature next()
throws IOException, IllegalAttributeException, NoSuchElementException {
if (reader == null) {
throw new IllegalStateException("Reader has already been closed");
}
SimpleFeature next = reader.next();
if( builder == null )
return next;
return SimpleFeatureBuilder.retype(next, builder);
}
/**
* @see org.geotools.data.FeatureReader#hasNext()
*/
public boolean hasNext() throws IOException {
if (reader == null) {
throw new IllegalStateException("Reader has already been closed");
}
return reader.hasNext();
}
/**
* @see org.geotools.data.FeatureReader#close()
*/
public void close() throws IOException {
if (reader == null) {
throw new IllegalStateException("Reader has already been closed");
}
reader.close();
reader = null;
builder = null;
}
}