/*
* Copyright 2005 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.common;
import org.drools.RuleBaseConfiguration;
import org.drools.core.util.index.IndexUtil;
import org.drools.reteoo.BetaMemory;
import org.drools.reteoo.BetaNode;
import org.drools.reteoo.LeftTuple;
import org.drools.reteoo.builder.BuildContext;
import org.drools.rule.ContextEntry;
import org.drools.rule.constraint.MvelConstraint;
import org.drools.spi.BetaNodeFieldConstraint;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import java.util.List;
public class SingleBetaConstraints
implements
BetaConstraints {
private static final long serialVersionUID = 510l;
protected BetaNodeFieldConstraint constraint;
private boolean indexed;
private transient boolean disableIndex;
public SingleBetaConstraints() {
}
public SingleBetaConstraints(final BetaNodeFieldConstraint[] constraint,
final RuleBaseConfiguration conf) {
this( constraint[0],
conf,
false );
}
public SingleBetaConstraints(final BetaNodeFieldConstraint constraint,
final RuleBaseConfiguration conf) {
this( constraint,
conf,
false );
}
public SingleBetaConstraints(final BetaNodeFieldConstraint constraint,
final RuleBaseConfiguration conf,
final boolean disableIndex) {
this.constraint = constraint;
this.disableIndex = disableIndex;
}
public void init(BuildContext context, short betaNodeType) {
RuleBaseConfiguration config = context.getRuleBase().getConfiguration();
if ( (disableIndex) || (!config.isIndexLeftBetaMemory() && !config.isIndexRightBetaMemory()) ) {
this.indexed = false;
} else {
initIndexes(config.getCompositeKeyDepth(), betaNodeType);
}
}
public void initIndexes(int depth, short betaNodeType) {
indexed = depth >= 1 && IndexUtil.isIndexableForNode(betaNodeType, constraint);
}
public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
constraint = (BetaNodeFieldConstraint)in.readObject();
indexed = in.readBoolean();
}
public void writeExternal(ObjectOutput out) throws IOException {
out.writeObject(constraint);
out.writeBoolean(indexed);
}
public ContextEntry[] createContext() {
return new ContextEntry[] { this.constraint.createContextEntry() };
}
/* (non-Javadoc)
* @see org.drools.common.BetaNodeConstraints#updateFromTuple(org.drools.reteoo.ReteTuple)
*/
public void updateFromTuple(final ContextEntry[] context,
final InternalWorkingMemory workingMemory,
final LeftTuple tuple) {
context[0].updateFromTuple( workingMemory,
tuple );
}
/* (non-Javadoc)
* @see org.drools.common.BetaNodeConstraints#updateFromFactHandle(org.drools.common.InternalFactHandle)
*/
public void updateFromFactHandle(final ContextEntry[] context,
final InternalWorkingMemory workingMemory,
final InternalFactHandle handle) {
context[0].updateFromFactHandle( workingMemory,
handle );
}
/* (non-Javadoc)
* @see org.drools.common.BetaNodeConstraints#isAllowedCachedLeft(java.lang.Object)
*/
public boolean isAllowedCachedLeft(final ContextEntry[] context,
final InternalFactHandle handle) {
return this.indexed || this.constraint.isAllowedCachedLeft( context[0],
handle );
}
/* (non-Javadoc)
* @see org.drools.common.BetaNodeConstraints#isAllowedCachedRight(org.drools.reteoo.ReteTuple)
*/
public boolean isAllowedCachedRight(final ContextEntry[] context,
final LeftTuple tuple) {
return this.constraint.isAllowedCachedRight( tuple,
context[0] );
}
public boolean isIndexed() {
return this.indexed;
}
public int getIndexCount() {
return (this.indexed ? 1 : 0);
}
public boolean isEmpty() {
return false;
}
public BetaMemory createBetaMemory(final RuleBaseConfiguration config,
final short nodeType) {
return IndexUtil.Factory.createBetaMemory(config, nodeType, constraint);
}
public int hashCode() {
return this.constraint.hashCode();
}
public BetaNodeFieldConstraint getConstraint() {
return this.constraint;
}
/* (non-Javadoc)
* @see org.drools.common.BetaNodeConstraints#getConstraints()
*/
public BetaNodeFieldConstraint[] getConstraints() {
return new BetaNodeFieldConstraint[] { this.constraint };
}
/**
* Determine if another object is equal to this.
*
* @param object
* The object to test.
*
* @return <code>true</code> if <code>object</code> is equal to this,
* otherwise <code>false</code>.
*/
public boolean equals(final Object object) {
if ( this == object ) {
return true;
}
if ( object == null || getClass() != object.getClass() ) {
return false;
}
final SingleBetaConstraints other = (SingleBetaConstraints) object;
return this.constraint == other.constraint || this.constraint.equals( other.constraint );
}
public void resetFactHandle(ContextEntry[] context) {
context[0].resetFactHandle();
}
public void resetTuple(ContextEntry[] context) {
context[0].resetTuple();
}
public BetaConstraints getOriginalConstraint() {
throw new UnsupportedOperationException();
}
public long getListenedPropertyMask(List<String> settableProperties) {
return constraint instanceof MvelConstraint ? ((MvelConstraint)constraint).getListenedPropertyMask(settableProperties) : Long.MAX_VALUE;
}
public boolean isLeftUpdateOptimizationAllowed() {
return true;
}
}