/*
* 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.data.h2;
import java.io.Reader;
import org.geotools.factory.Hints;
import org.geotools.util.Converter;
import org.geotools.util.ConverterFactory;
import org.h2.jdbc.JdbcClob;
/**
* Converts a H2 JdbcClob to a String
*
* @author Andrea Aime - GeoSolutions
*
*
*
* @source $URL$
*/
public class H2ClobConverterFactory implements ConverterFactory {
H2ClobConverter converter = new H2ClobConverter();
public Converter createConverter(Class<?> source, Class<?> target, Hints hints) {
// can only convert towards String
if (!(String.class.equals(target)))
return null;
// can only deal with JdbcClob
if (!JdbcClob.class.isAssignableFrom(source))
return null;
// converter is thread safe, so cache and return just one
return converter;
}
class H2ClobConverter implements Converter {
public <T> T convert(Object source, Class<T> target) throws Exception {
JdbcClob clob = (JdbcClob) source;
Reader r = null;
try {
StringBuilder sb = new StringBuilder();
char[] cbuf = new char[4096];
int read;
r = clob.getCharacterStream();
while ((read = r.read(cbuf)) > 0) {
sb.append(cbuf, 0, read);
}
return (T) sb.toString();
} finally {
r.close();
}
}
}
}