/*****************************************************************
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
****************************************************************/
package org.apache.cayenne.access.types;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import org.apache.cayenne.CayenneRuntimeException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* ExtendedTypeFactory for handling serializable objects. Returned ExtendedType
* is simply an object serialization wrapper on top of byte[] ExtendedType.
*
* @since 3.0
*/
class SerializableTypeFactory implements ExtendedTypeFactory {
private static final Logger logger = LoggerFactory.getLogger(SerializableTypeFactory.class);
private ExtendedTypeMap map;
SerializableTypeFactory(ExtendedTypeMap map) {
this.map = map;
}
public ExtendedType getType(Class<?> objectClass) {
logger.warn("Haven't found suitable ExtendedType for class '" + objectClass.getCanonicalName()
+ "'. Most likely you need to define a custom ExtendedType.");
if (Serializable.class.isAssignableFrom(objectClass)) {
logger.warn("SerializableType will be used for type conversion.");
// using a binary stream delegate instead of byte[] may actually
// speed up things in some dbs, but at least byte[] type works consistently
// across adapters...
// note - can't use "getRegisteredType" as it causes infinite recursion
@SuppressWarnings("unchecked")
ExtendedType<byte[]> bytesType = map.getExplictlyRegisteredType("byte[]");
return new SerializableType(objectClass, bytesType);
}
return null;
}
/**
* A serialization wrapper on top of byte[] ExtendedType
*/
final class SerializableType extends ExtendedTypeDecorator<Object, byte[]> {
private Class<?> javaClass;
SerializableType(Class<?> javaClass, ExtendedType<byte[]> bytesType) {
super(bytesType);
this.javaClass = javaClass;
}
@Override
public String getClassName() {
return javaClass.getCanonicalName();
}
@Override
byte[] fromJavaObject(Object object) {
ByteArrayOutputStream bytes = new ByteArrayOutputStream() {
// avoid unneeded array copy...
@Override
public synchronized byte[] toByteArray() {
return buf;
}
};
try (ObjectOutputStream out = new ObjectOutputStream(bytes)) {
out.writeObject(object);
} catch (Exception e) {
throw new CayenneRuntimeException("Error serializing object", e);
}
return bytes.toByteArray();
}
@Override
Object toJavaObject(byte[] bytes) {
try {
return bytes != null && bytes.length > 0
? new ObjectInputStream(new ByteArrayInputStream(bytes)).readObject() : null;
} catch (Exception e) {
throw new CayenneRuntimeException("Error deserializing object", e);
}
}
}
}