/*
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* JBoss, Home of Professional Open Source
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* Copyright 2005, JBoss Inc., and individual contributors as indicated
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* by the @authors tag. See the copyright.txt in the distribution for a
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* full listing of individual contributors.
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*
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* This is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as
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* published by the Free Software Foundation; either version 2.1 of
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* the License, or (at your option) any later version.
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*
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* This software is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this software; if not, write to the Free
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* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
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*/
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package org.jbpm.pvm.internal.tx;
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import java.util.Arrays;
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import org.jbpm.pvm.internal.model.ScopeInstanceImpl;
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import org.jbpm.pvm.internal.type.converter.SerializableToBytesConverter;
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import org.jbpm.pvm.internal.type.variable.BlobVariable;
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/**
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* @author Tom Baeyens
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*/
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public class DeserializedObject {
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private static final SerializableToBytesConverter serializableToBytesConverter = new SerializableToBytesConverter();
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Object deserializedObject;
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ScopeInstanceImpl scopeInstance;
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BlobVariable blobVariable;
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public DeserializedObject(Object deserializedObject, ScopeInstanceImpl scopeInstance, BlobVariable blobVariable) {
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this.deserializedObject = deserializedObject;
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this.scopeInstance = scopeInstance;
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this.blobVariable = blobVariable;
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}
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public void flush() {
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String variableName = blobVariable.getKey();
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Object currentValue = scopeInstance.getVariable(variableName);
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// first check if the deserialized object still is the value for that variable.
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// a different, new object (of any type) might have been set in the meantime in that key-value-pair
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if ( (currentValue!=null)
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&& (currentValue==deserializedObject)
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) {
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// next, we check if the serialized object was actually changed or not
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byte[] newBytes = (byte[]) serializableToBytesConverter.convert(currentValue, null, null);
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byte[] persistedBytes = blobVariable.getLob().extractBytes();
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// if it is changed
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if (!Arrays.equals(persistedBytes, newBytes)) {
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// then do an automatic update
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blobVariable.setValue(deserializedObject, scopeInstance);
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}
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}
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}
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}
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