/*
* 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.ingres;
import java.io.InputStream;
import java.lang.reflect.Method;
import org.geotools.factory.Hints;
import org.geotools.util.Converter;
import org.geotools.util.ConverterFactory;
public class IngresBlobConverterFactory implements ConverterFactory {
IngresBlobConverter converter = new IngresBlobConverter();
static final Class<?> INGRES_BLOB;
static final Method INGRES_GET_STREAM;
static final Method INGRES_LENGTH;
static {
Class<?> jdbcBlobClass = null;
try {
jdbcBlobClass = Class.forName("java.sql.Blob");
} catch (ClassNotFoundException e) {
// ojdbc*.jar not on the path
}
if (jdbcBlobClass == null) {
INGRES_BLOB = null;
INGRES_GET_STREAM = null;
INGRES_LENGTH = null;
} else {
try {
INGRES_BLOB = jdbcBlobClass;
INGRES_LENGTH = INGRES_BLOB.getMethod("length");
INGRES_GET_STREAM = INGRES_BLOB.getMethod("getBinaryStream");
} catch(Exception e) {
throw new RuntimeException("Could not initialize the ingres blob converter", e);
}
}
}
public Converter createConverter(Class<?> source, Class<?> target,
Hints hints) {
// if the jdbc driver is not in the classpath don't bother trying to convert
if(INGRES_BLOB == null)
return null;
// can only convert towards byte[]
if (!(byte[].class.equals(target)))
return null;
// can only deal with oracle specific blob classes
if (!INGRES_BLOB.isAssignableFrom(source))
return null;
// converter is thread safe, so cache and return just one
return converter;
}
class IngresBlobConverter implements Converter {
public <T> T convert(Object source, Class<T> target) throws Exception {
int length = ((Long) INGRES_LENGTH.invoke(source)).intValue();
byte[] buffer = new byte[length];
InputStream dataStream = (InputStream) INGRES_GET_STREAM.invoke(source);
dataStream.read(buffer, 0, length);
return (T) buffer;
}
}
}