/**
* 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.common;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import org.drools.reteoo.LeftTuple;
import org.drools.rule.ContextEntry;
import org.drools.rule.Declaration;
import org.drools.rule.Pattern;
import org.drools.spi.BetaNodeFieldConstraint;
/**
* InstanceEqualsConstraint
*
* Created: 21/06/2006
* @author <a href="mailto:tirelli@post.com">Edson Tirelli</a>
*
* @version $Id$
*/
public class InstanceEqualsConstraint
implements
BetaNodeFieldConstraint {
private static final long serialVersionUID = 510l;
private Declaration[] declarations = new Declaration[0];
private Pattern otherPattern;
public InstanceEqualsConstraint() {
}
public InstanceEqualsConstraint(final Pattern otherPattern) {
this.otherPattern = otherPattern;
}
public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
declarations = (Declaration[])in.readObject();
otherPattern = (Pattern)in.readObject();
}
public void writeExternal(ObjectOutput out) throws IOException {
out.writeObject(declarations);
out.writeObject(otherPattern);
}
public Declaration[] getRequiredDeclarations() {
return this.declarations;
}
public void replaceDeclaration(Declaration oldDecl,
Declaration newDecl) {
}
public Pattern getOtherPattern() {
return this.otherPattern;
}
public boolean isTemporal() {
return false;
}
public ContextEntry createContextEntry() {
return new InstanceEqualsConstraintContextEntry( this.otherPattern );
}
public boolean isAllowedCachedLeft(final ContextEntry context,
final InternalFactHandle handle) {
return ((InstanceEqualsConstraintContextEntry) context).left == handle.getObject();
}
public boolean isAllowedCachedRight(final LeftTuple tuple,
final ContextEntry context) {
return tuple.get( this.otherPattern.getOffset() ).getObject() == ((InstanceEqualsConstraintContextEntry) context).right;
}
public String toString() {
return "[InstanceEqualsConstraint otherPattern=" + this.otherPattern + " ]";
}
public int hashCode() {
return this.otherPattern.hashCode();
}
public Object clone() {
// don't clone pattern
return new InstanceEqualsConstraint( this.otherPattern );
}
public boolean equals(final Object object) {
if ( this == object ) {
return true;
}
if ( object == null || !(object instanceof InstanceEqualsConstraint) ) {
return false;
}
final InstanceEqualsConstraint other = (InstanceEqualsConstraint) object;
return this.otherPattern.equals( other.otherPattern );
}
public static class InstanceEqualsConstraintContextEntry
implements
ContextEntry {
private static final long serialVersionUID = 510l;
public Object left;
public Object right;
private Pattern pattern;
private ContextEntry entry;
public InstanceEqualsConstraintContextEntry() {
}
public InstanceEqualsConstraintContextEntry(final Pattern pattern) {
this.pattern = pattern;
}
public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
left = in.readObject();
right = in.readObject();
pattern = (Pattern)in.readObject();
entry = (ContextEntry)in.readObject();
}
public void writeExternal(ObjectOutput out) throws IOException {
out.writeObject(left);
out.writeObject(right);
out.writeObject(pattern);
out.writeObject(entry);
}
public ContextEntry getNext() {
return this.entry;
}
public void setNext(final ContextEntry entry) {
this.entry = entry;
}
public void updateFromTuple(final InternalWorkingMemory workingMemory,
final LeftTuple tuple) {
this.left = tuple.get( this.pattern.getOffset() ).getObject();
}
public void updateFromFactHandle(final InternalWorkingMemory workingMemory,
final InternalFactHandle handle) {
this.right = handle.getObject();
}
public void resetTuple() {
this.left = null;
}
public void resetFactHandle() {
this.right = null;
}
}
public ConstraintType getType() {
return ConstraintType.BETA;
}
}