/**
* 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 org.drools.common.InternalFactHandle;
import org.drools.core.util.Entry;
import org.drools.core.util.RightTupleList;
public class RightTuple
implements
Entry {
protected InternalFactHandle handle;
private RightTuple handlePrevious;
private RightTuple handleNext;
private RightTupleList memory;
private Entry previous;
private Entry next;
public LeftTuple firstChild;
public LeftTuple lastChild;
private LeftTuple blocked;
protected RightTupleSink sink;
public RightTuple() {
}
public RightTuple(InternalFactHandle handle) {
// This constructor is here for DSL testing
this.handle = handle;
}
public RightTuple(InternalFactHandle handle,
RightTupleSink sink) {
this.handle = handle;
this.sink = sink;
RightTuple last = handle.getLastRightTuple();
if ( last == null ) {
// no other RightTuples, just add.
handle.setFirstRightTuple( this );
handle.setLastRightTuple( this );
} else {
// add to end of RightTuples on handle
this.handlePrevious = last;
last.setHandleNext( this );
this.handle.setLastRightTuple( this );
}
}
public RightTupleSink getRightTupleSink() {
return this.sink;
}
public void reAdd() {
RightTuple last = handle.getLastRightTuple();
if ( last == null ) {
// node other RightTuples, just add.
handle.setFirstRightTuple( this );
handle.setLastRightTuple( this );
} else {
this.handleNext = null; // null this in case it was set when this RightTuple was last used
// add to end of RightTuples on handle
this.handlePrevious = last;
last.setHandleNext( this );
this.handle.setLastRightTuple( this );
}
}
public void unlinkFromRightParent() {
RightTuple previousParent = this.handlePrevious;
RightTuple nextParent = this.handleNext;
if ( previousParent != null && nextParent != null ) {
// remove from middle
this.handlePrevious.handleNext = nextParent;
this.handleNext.handlePrevious = previousParent;
} else if ( nextParent != null ) {
// remove from first
this.handleNext.handlePrevious = null;
this.handle.setFirstRightTuple( this.handleNext );
} else if ( previousParent != null ) {
// remove from end
this.handlePrevious.handleNext = null;
this.handle.setLastRightTuple( this.handlePrevious );
} else {
// single remaining item, no previous or next
this.handle.setFirstRightTuple( null );
this.handle.setLastRightTuple( null );
}
this.handle = null;
this.handlePrevious = null;
this.handleNext = null;
this.blocked = null;
this.previous = null;
this.next = null;
this.memory = null;
this.firstChild = null;
this.lastChild = null;
this.sink = null;
}
public InternalFactHandle getFactHandle() {
return this.handle;
}
public LeftTuple getBlocked() {
return this.blocked;
}
public void nullBlocked() {
this.blocked = null;
}
public void addBlocked(LeftTuple leftTuple) {
if ( this.blocked != null && leftTuple != null ) {
leftTuple.setBlockedNext( this.blocked );
this.blocked.setBlockedPrevious( leftTuple );
}
this.blocked = leftTuple;
}
public void removeBlocked(LeftTuple leftTuple) {
LeftTuple previous = (LeftTuple) leftTuple.getBlockedPrevious();
LeftTuple next = (LeftTuple) leftTuple.getBlockedNext();
if ( previous != null && next != null ) {
//remove from middle
previous.setBlockedNext( next );
next.setBlockedPrevious( previous );
} else if ( next != null ) {
//remove from first
this.blocked = next;
next.setBlockedPrevious( null );
} else if ( previous != null ) {
//remove from end
previous.setBlockedNext( null );
} else {
this.blocked = null;
}
}
public RightTupleList getMemory() {
return memory;
}
public void setMemory(RightTupleList memory) {
this.memory = memory;
}
public Entry getPrevious() {
return previous;
}
public void setPrevious(Entry previous) {
this.previous = previous;
}
public RightTuple getHandlePrevious() {
return handlePrevious;
}
public void setHandlePrevious(RightTuple handlePrevious) {
this.handlePrevious = handlePrevious;
}
public RightTuple getHandleNext() {
return handleNext;
}
public void setHandleNext(RightTuple handleNext) {
this.handleNext = handleNext;
}
public Entry getNext() {
return next;
}
public void setNext(Entry next) {
this.next = next;
}
// public LeftTuple getFirstChild() {
// return firstChild;
// }
//
// public void setFirstChildren(LeftTuple betachildren) {
// this.firstChild = betachildren;
// }
public int hashCode() {
return this.handle.hashCode();
}
public String toString() {
return this.handle.toString() + "\n";
}
public boolean equals(RightTuple other) {
// we know the object is never null and always of the type ReteTuple
if ( other == this ) {
return true;
}
// A ReteTuple is only the same if it has the same hashCode, factId and parent
if ( (other == null) || (hashCode() != other.hashCode()) ) {
return false;
}
return this.handle == other.handle;
}
public boolean equals(Object object) {
return equals( (RightTuple) object );
}
}