/**
* Copyright 2010 JBoss Inc
*
* 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.drools.base.mvel;
import java.io.Externalizable;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import org.drools.common.InternalFactHandle;
import org.drools.common.InternalWorkingMemory;
import org.drools.rule.Declaration;
import org.drools.runtime.rule.WorkingMemoryEntryPoint;
import org.mvel2.integration.VariableResolver;
public class DroolsMVELPreviousDeclarationVariable
implements
VariableResolver,
Externalizable {
private Declaration declaration;
private DroolsMVELFactory factory;
public DroolsMVELPreviousDeclarationVariable() {
}
public DroolsMVELPreviousDeclarationVariable(final Declaration declaration,
final DroolsMVELFactory factory) {
this.declaration = declaration;
this.factory = factory;
}
public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
declaration = (Declaration)in.readObject();
factory = (DroolsMVELFactory)in.readObject();
}
public void writeExternal(ObjectOutput out) throws IOException {
out.writeObject(declaration);
out.writeObject(factory);
}
public String getName() {
return this.declaration.getIdentifier();
}
public Class getKnownType() {
return this.declaration.getExtractor().getExtractToClass();
}
public Object getValue() {
Declaration decl = this.declaration;
if( this.factory.getKnowledgeHelper() != null ) {
decl = this.factory.getKnowledgeHelper().getDeclaration( this.declaration.getIdentifier() );
InternalFactHandle factHandle = (InternalFactHandle)this.factory.getFactHandle(decl);
WorkingMemoryEntryPoint entryPoint = factHandle.getEntryPoint();
if(entryPoint != null){
this.factory.getKnowledgeHelper()
.getIdentityMap()
.put(entryPoint.getObject(factHandle), factHandle);
}
}
return decl.getValue( (InternalWorkingMemory) this.factory.getWorkingMemory(), this.factory.getValue( decl ) );
}
public void setValue(final Object value) {
throw new UnsupportedOperationException( "External Variable identifer='" + getName() + "' type='" + getKnownType() + "' is final, it cannot be set" );
}
public int getFlags() {
return 0;
}
/**
* Not used in drools.
*/
public Class getType() {
return this.declaration.getExtractor().getExtractToClass();
}
/**
* Not used in drools.
*/
public void setStaticType(Class arg0) {
}
}