/* 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.
*/
package org.activiti.engine.impl.variable;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.ObjectStreamClass;
import java.io.OutputStream;
import java.io.Serializable;
import org.activiti.engine.ActivitiException;
import org.activiti.engine.impl.context.Context;
import org.activiti.engine.impl.persistence.entity.VariableInstanceEntity;
import org.activiti.engine.impl.util.IoUtil;
import org.activiti.engine.impl.util.ReflectUtil;
/**
* @author Tom Baeyens
* @author Marcus Klimstra (CGI)
*/
public class SerializableType extends ByteArrayType {
public static final String TYPE_NAME = "serializable";
public String getTypeName() {
return TYPE_NAME;
}
public Object getValue(ValueFields valueFields) {
Object cachedObject = valueFields.getCachedValue();
if (cachedObject != null) {
return cachedObject;
}
byte[] bytes = (byte[]) super.getValue(valueFields);
if (bytes != null) {
Object deserializedObject = deserialize(bytes, valueFields);
valueFields.setCachedValue(deserializedObject);
if (valueFields instanceof VariableInstanceEntity) {
// we need to register the deserialized object for dirty checking,
// so that it can be serialized again if it was changed.
Context.getCommandContext()
.getDbSqlSession()
.addDeserializedObject(new DeserializedObject(this, deserializedObject, bytes, (VariableInstanceEntity) valueFields));
}
return deserializedObject;
}
return null; // byte array is null
}
public void setValue(Object value, ValueFields valueFields) {
byte[] byteArray = serialize(value, valueFields);
valueFields.setCachedValue(value);
if (valueFields.getBytes() == null) {
// TODO why the null check? won't this cause issues when setValue is called the second this with a different object?
if (valueFields instanceof VariableInstanceEntity) {
// register the deserialized object for dirty checking.
Context.getCommandContext()
.getDbSqlSession()
.addDeserializedObject(new DeserializedObject(this, valueFields.getCachedValue(), byteArray, (VariableInstanceEntity)valueFields));
}
}
super.setValue(byteArray, valueFields);
}
public byte[] serialize(Object value, ValueFields valueFields) {
if (value == null) {
return null;
}
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ObjectOutputStream oos = null;
try {
oos = createObjectOutputStream(baos);
oos.writeObject(value);
} catch (Exception e) {
throw new ActivitiException("Couldn't serialize value '"+value+"' in variable '"+valueFields.getName()+"'", e);
} finally {
IoUtil.closeSilently(oos);
}
return baos.toByteArray();
}
public Object deserialize(byte[] bytes, ValueFields valueFields) {
ByteArrayInputStream bais = new ByteArrayInputStream(bytes);
try {
ObjectInputStream ois = createObjectInputStream(bais);
Object deserializedObject = ois.readObject();
return deserializedObject;
} catch (Exception e) {
throw new ActivitiException("Couldn't deserialize object in variable '"+valueFields.getName()+"'", e);
} finally {
IoUtil.closeSilently(bais);
}
}
public boolean isAbleToStore(Object value) {
// TODO don't we need null support here?
return value instanceof Serializable;
}
protected ObjectInputStream createObjectInputStream(InputStream is) throws IOException {
return new ObjectInputStream(is) {
protected Class<?> resolveClass(ObjectStreamClass desc) throws IOException, ClassNotFoundException {
return ReflectUtil.loadClass(desc.getName());
}
};
}
protected ObjectOutputStream createObjectOutputStream(OutputStream os) throws IOException {
return new ObjectOutputStream(os);
}
}