/*
* 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;
import java.io.IOException;
import java.util.NoSuchElementException;
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;
/**
* Basic support for reading Features from an AttributeReader.
*
* @author Ian Schneider
* @source $URL$
* @version $Id$
*/
public class DefaultFeatureReader implements FeatureReader<SimpleFeatureType, SimpleFeature> {
private final AttributeReader attributeReader;
private final SimpleFeatureType schema;
protected final Object[] attributes;
/**
* Creates a new instance of AbstractFeatureReader
*
* @param attributeReader AttributeReader for contents
* @param schema FeatureType to use, <code>null</code> if not provided
*
* @throws SchemaException If Schema could not be obtained
*/
public DefaultFeatureReader(AttributeReader attributeReader,
SimpleFeatureType schema) throws SchemaException {
this.attributeReader = attributeReader;
if (schema == null) {
schema = createSchema();
}
this.schema = schema;
this.attributes = new Object[attributeReader.getAttributeCount()];
}
public DefaultFeatureReader(AttributeReader attributeReader)
throws SchemaException {
this(attributeReader, null);
}
public SimpleFeature next()
throws IOException, IllegalAttributeException, NoSuchElementException {
SimpleFeature f = null;
if (attributeReader.hasNext()) {
attributeReader.next();
f = readFeature(attributeReader);
}
return f;
}
protected SimpleFeatureType createSchema() throws SchemaException {
SimpleFeatureTypeBuilder builder = new SimpleFeatureTypeBuilder();
for (int i = 0, ii = attributeReader.getAttributeCount(); i < ii;
i++) {
builder.add(attributeReader.getAttributeType(i));
}
return builder.buildFeatureType();
}
protected SimpleFeature readFeature(AttributeReader atts)
throws IllegalAttributeException, IOException {
for (int i = 0, ii = atts.getAttributeCount(); i < ii; i++) {
attributes[i] = atts.read(i);
}
return SimpleFeatureBuilder.build( schema, attributes, null );
}
public void close() throws IOException {
attributeReader.close();
}
public SimpleFeatureType getFeatureType() {
return schema;
}
public boolean hasNext() throws IOException {
return attributeReader.hasNext();
}
}