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DataNucleus Core provides the primary components of a heterogenous Java persistence solution.
It supports persistence API's being layered on top of the core functionality.
/**********************************************************************
Copyright (c) 2012 Andy Jefferson and others. All rights reserved.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
Contributors:
...
**********************************************************************/
package org.datanucleus.store.types.converters;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import org.datanucleus.exceptions.NucleusException;
import org.datanucleus.store.types.converters.TypeConverter;
import org.datanucleus.util.Base64;
/**
* Convenience class to handle Java serialisation of a Serializable object to/from String.
* Of use where a datastore allows persistence of String types, but not serialised types.
*/
public class SerializableStringConverter implements TypeConverter
{
private static final long serialVersionUID = 5269636067035783545L;
/* (non-Javadoc)
* @see org.datanucleus.store.types.converters.TypeConverter#toDatastoreType(java.lang.Object)
*/
public String toDatastoreType(Serializable memberValue)
{
String str = null;
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ObjectOutputStream oos = null;
try
{
try
{
oos = new ObjectOutputStream(baos);
oos.writeObject(memberValue);
str = new String(Base64.encode(baos.toByteArray()));
}
finally
{
try
{
baos.close();
}
finally
{
if (oos != null)
{
oos.close();
}
}
}
}
catch (IOException ioe)
{
throw new NucleusException("Error serialising object of type " + memberValue.getClass().getName() + " to String", ioe);
}
return str;
}
/* (non-Javadoc)
* @see org.datanucleus.store.types.converters.TypeConverter#toMemberType(java.lang.Object)
*/
public Serializable toMemberType(String datastoreValue)
{
byte[] bytes = Base64.decode(datastoreValue);
Serializable obj = null;
ByteArrayInputStream bais = new ByteArrayInputStream(bytes);
ObjectInputStream ois = null;
try
{
try
{
ois = new ObjectInputStream(bais);
obj = (Serializable)ois.readObject();
}
finally
{
try
{
bais.close();
}
finally
{
if (ois != null)
{
ois.close();
}
}
}
}
catch (Exception e)
{
throw new NucleusException("Error deserialising " + datastoreValue, e);
}
return obj;
}
}