/**
* 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.reteoo;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import org.drools.common.BaseNode;
import org.drools.common.InternalFactHandle;
import org.drools.common.InternalWorkingMemory;
import org.drools.common.RuleBasePartitionId;
import org.drools.spi.PropagationContext;
public class SingleLeftTupleSinkAdapter extends AbstractLeftTupleSinkAdapter {
protected LeftTupleSink sink;
public SingleLeftTupleSinkAdapter() {
this( RuleBasePartitionId.MAIN_PARTITION,
null );
}
public SingleLeftTupleSinkAdapter(final RuleBasePartitionId partitionId,
final LeftTupleSink sink) {
super( partitionId );
this.sink = sink;
}
public void createChildLeftTuplesforQuery(final LeftTuple leftTuple,
final RightTuple rightTuple,
boolean leftTupleMemoryEnabled) {
LeftTuple child = new LeftTuple( leftTuple,
rightTuple,
null,
null,
this.sink,
leftTupleMemoryEnabled );
child.setLeftParentNext( leftTuple.firstChild );
leftTuple.firstChild = child;
}
public void propagateAssertLeftTuple(final LeftTuple leftTuple,
final RightTuple rightTuple,
final LeftTuple currentLeftChild,
final LeftTuple currentRightChild,
final PropagationContext context,
final InternalWorkingMemory workingMemory,
boolean leftTupleMemoryEnabled) {
doPropagateAssertLeftTuple( context,
workingMemory,
new LeftTuple( leftTuple,
rightTuple,
currentLeftChild,
currentRightChild,
this.sink,
leftTupleMemoryEnabled ) );
}
public void propagateAssertLeftTuple(final LeftTuple tuple,
final PropagationContext context,
final InternalWorkingMemory workingMemory,
boolean leftTupleMemoryEnabled) {
doPropagateAssertLeftTuple( context,
workingMemory,
new LeftTuple( tuple,
this.sink,
leftTupleMemoryEnabled ) );
}
public void propagateRetractLeftTuple(final LeftTuple leftTuple,
final PropagationContext context,
final InternalWorkingMemory workingMemory) {
LeftTuple child = leftTuple.firstChild;
while ( child != null ) {
LeftTuple temp = child.getLeftParentNext();
doPropagateRetractLeftTuple( context,
workingMemory,
child,
child.getLeftTupleSink() );
child.unlinkFromRightParent();
child.unlinkFromLeftParent();
child = temp;
}
}
public void propagateRetractLeftTupleDestroyRightTuple(final LeftTuple leftTuple,
final PropagationContext context,
final InternalWorkingMemory workingMemory) {
LeftTuple child = leftTuple.firstChild;
while ( child != null ) {
LeftTuple temp = child.getLeftParentNext();
doPropagateRetractLeftTuple( context,
workingMemory,
child,
child.getLeftTupleSink() );
workingMemory.getFactHandleFactory().destroyFactHandle( child.getRightParent().getFactHandle() );
child.unlinkFromRightParent();
child.unlinkFromLeftParent();
child = temp;
}
}
public void propagateRetractRightTuple(final RightTuple rightTuple,
final PropagationContext context,
final InternalWorkingMemory workingMemory) {
LeftTuple child = rightTuple.firstChild;
while ( child != null ) {
LeftTuple temp = child.getRightParentNext();
doPropagateRetractLeftTuple( context,
workingMemory,
child,
child.getLeftTupleSink() );
child.unlinkFromLeftParent();
child.unlinkFromRightParent();
child = temp;
}
}
public void createAndPropagateAssertLeftTuple(final InternalFactHandle factHandle,
final PropagationContext context,
final InternalWorkingMemory workingMemory,
boolean leftTupleMemoryEnabled) {
doPropagateAssertLeftTuple( context,
workingMemory,
new LeftTuple( factHandle,
this.sink,
leftTupleMemoryEnabled ) );
}
public BaseNode getMatchingNode(BaseNode candidate) {
if ( candidate.equals( sink ) ) {
return (BaseNode) sink;
}
return null;
}
public LeftTupleSink[] getSinks() {
return new LeftTupleSink[]{this.sink};
}
public int size() {
return (this.sink != null) ? 1 : 0;
}
public void readExternal(ObjectInput in) throws IOException,
ClassNotFoundException {
super.readExternal( in );
this.sink = (LeftTupleSink) in.readObject();
}
public void writeExternal(ObjectOutput out) throws IOException {
super.writeExternal( out );
out.writeObject( this.sink );
}
public void doPropagateAssertLeftTuple(PropagationContext context,
InternalWorkingMemory workingMemory,
LeftTuple leftTuple,
LeftTupleSink sink) {
sink.assertLeftTuple( leftTuple, context, workingMemory );
}
/**
* This is a hook method that may be overriden by subclasses. Please keep it
* package protected.
*
* @param context
* @param workingMemory
* @param newLeftTuple
*/
protected void doPropagateAssertLeftTuple(PropagationContext context,
InternalWorkingMemory workingMemory,
LeftTuple newLeftTuple) {
this.sink.assertLeftTuple( newLeftTuple,
context,
workingMemory );
}
protected void doPropagateModifyLeftTuple(InternalFactHandle factHandle,
ModifyPreviousTuples modifyPreviousTuples,
PropagationContext context,
InternalWorkingMemory workingMemory) {
this.sink.modifyLeftTuple( factHandle,
modifyPreviousTuples,
context,
workingMemory );
}
/**
* This is a hook method that may be overriden by subclasses. Please keep it
* package protected.
*
* @param context
* @param workingMemory
* @param child
* @param tupleSink
*/
protected void doPropagateRetractLeftTuple(PropagationContext context,
InternalWorkingMemory workingMemory,
LeftTuple child,
LeftTupleSink tupleSink) {
tupleSink.retractLeftTuple( child,
context,
workingMemory );
}
// related to true modify
public void propagateModifyObject(InternalFactHandle factHandle,
ModifyPreviousTuples modifyPreviousTuples,
PropagationContext context,
InternalWorkingMemory workingMemory) {
doPropagateModifyLeftTuple( factHandle,
modifyPreviousTuples,
context,
workingMemory );
}
public LeftTuple propagateModifyChildLeftTuple(LeftTuple childLeftTuple,
RightTuple parentRightTuple,
PropagationContext context,
InternalWorkingMemory workingMemory,
boolean tupleMemoryEnabled) {
childLeftTuple.getLeftTupleSink().modifyLeftTuple( childLeftTuple,
context,
workingMemory );
return childLeftTuple.getLeftParentNext();
}
public LeftTuple propagateModifyChildLeftTuple(LeftTuple childLeftTuple,
LeftTuple parentLeftTuple,
PropagationContext context,
InternalWorkingMemory workingMemory,
boolean tupleMemoryEnabled) {
childLeftTuple.getLeftTupleSink().modifyLeftTuple( childLeftTuple,
context,
workingMemory );
return childLeftTuple.getRightParentNext();
}
public void propagateModifyChildLeftTuple(LeftTuple leftTuple,
PropagationContext context,
InternalWorkingMemory workingMemory,
boolean tupleMemoryEnabled) {
// not shared, so only one child
leftTuple.firstChild.getLeftTupleSink().modifyLeftTuple( leftTuple.firstChild,
context,
workingMemory );
}
public LeftTuple propagateRetractChildLeftTuple(LeftTuple childLeftTuple,
RightTuple parentRightTuple,
PropagationContext context,
InternalWorkingMemory workingMemory) {
LeftTuple temp = childLeftTuple.getLeftParentNext();
doPropagateRetractLeftTuple( context,
workingMemory,
childLeftTuple,
childLeftTuple.getLeftTupleSink() );
childLeftTuple.unlinkFromRightParent();
childLeftTuple.unlinkFromLeftParent();
return temp;
}
public LeftTuple propagateRetractChildLeftTuple(LeftTuple childLeftTuple,
LeftTuple parentLeftTuple,
PropagationContext context,
InternalWorkingMemory workingMemory) {
LeftTuple temp = childLeftTuple.getRightParentNext();
doPropagateRetractLeftTuple( context,
workingMemory,
childLeftTuple,
childLeftTuple.getLeftTupleSink() );
childLeftTuple.unlinkFromRightParent();
childLeftTuple.unlinkFromLeftParent();
return temp;
}
}