/*
* 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.oracle;
import java.lang.reflect.Method;
import java.util.Date;
import org.geotools.factory.Hints;
import org.geotools.util.Converter;
import org.geotools.util.ConverterFactory;
public class OracleDateConverterFactory implements ConverterFactory {
OracleDateConverter converter = new OracleDateConverter();
static final Class<?> ORA_DATE;
static final Class<?> ORA_TIMESTAMP;
static final Method ORA_DATE_DVALUE;
static final Method ORA_DATE_TSVALUE;
static final Method ORA_TS_DVALUE;
static final Method ORA_TS_TSVALUE;
static {
Class<?> oracleDateClass = null;
try {
oracleDateClass = Class.forName("oracle.sql.DATE");
} catch (ClassNotFoundException e) {
// ojdbc*.jar not on the path
}
if (oracleDateClass == null) {
ORA_DATE = null;
ORA_DATE_DVALUE = null;
ORA_DATE_TSVALUE = null;
ORA_TIMESTAMP = null;
ORA_TS_DVALUE = null;
ORA_TS_TSVALUE = null;
} else {
try {
ORA_DATE = oracleDateClass;
ORA_DATE_DVALUE = ORA_DATE.getMethod("dateValue");
ORA_DATE_TSVALUE = ORA_DATE.getMethod("timestampValue");
ORA_TIMESTAMP = Class.forName("oracle.sql.TIMESTAMP");
ORA_TS_DVALUE = ORA_TIMESTAMP.getMethod("dateValue");
ORA_TS_TSVALUE = ORA_TIMESTAMP.getMethod("timestampValue");
} catch(Exception e) {
throw new RuntimeException("Could not initialize the oracle date 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(ORA_DATE == null)
return null;
// can only convert towards java.util.Date && subclasses
if (!(Date.class.isAssignableFrom(target)))
return null;
// can only deal with oracle specific date classes
if (!(ORA_TIMESTAMP.isAssignableFrom(source)) && !(ORA_DATE.isAssignableFrom(source)))
return null;
// converter is thread safe, so cache and return just one
return converter;
}
class OracleDateConverter implements Converter {
public <T> T convert(Object source, Class<T> target) throws Exception {
if (ORA_TIMESTAMP.isInstance(source)) {
if (java.sql.Date.class.isAssignableFrom(target))
return (T) ORA_TS_DVALUE.invoke(source);
else
return (T) ORA_TS_TSVALUE.invoke(source);
} else {
if (java.sql.Date.class.isAssignableFrom(target))
return (T) ORA_DATE_DVALUE.invoke(source);
else
return (T) ORA_DATE_TSVALUE.invoke(source);
}
}
}
}