org.drools.core.rule.ConditionalBranch Maven / Gradle / Ivy
/*
* Copyright 2015 Red Hat, Inc. and/or its affiliates.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
*
* 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.core.rule;
import java.io.Externalizable;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import java.util.Collections;
import java.util.List;
import java.util.Map;
public class ConditionalBranch extends ConditionalElement implements Externalizable, NamedConsequenceInvoker {
private EvalCondition condition;
private NamedConsequence consequence;
private ConditionalBranch elseBranch;
public ConditionalBranch() {
}
public ConditionalBranch( EvalCondition condition, NamedConsequence consequence, ConditionalBranch elseBranch ) {
this.condition = condition;
this.consequence = consequence;
this.elseBranch = elseBranch;
}
public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
condition = (EvalCondition)in.readObject();
consequence = (NamedConsequence)in.readObject();
elseBranch = (ConditionalBranch)in.readObject();
}
public void writeExternal(ObjectOutput out) throws IOException {
out.writeObject(condition);
out.writeObject(consequence);
out.writeObject(elseBranch);
}
/**
* There is not reason to clone this object since it is stateless.
* So a clone() call will return the instance itself.
*/
@Override
public ConditionalBranch clone() {
return new ConditionalBranch(condition.clone(), consequence.clone(), (elseBranch == null ) ? null : elseBranch.clone());
}
/**
* It is not possible to declare any new variables, so always
* return an Empty Map
*/
public Map getInnerDeclarations() {
return Collections.emptyMap();
}
/**
* It is not possible to nest elements inside a conditional branch, so
* always return an empty list.
*/
public List getNestedElements() {
return Collections.emptyList();
}
/**
* It is not possible to declare and export any variables,
* so always return an empty map
*/
public Map getOuterDeclarations() {
return Collections.emptyMap();
}
/**
* Not possible to resolve any declaration, so always return null.
*/
public Declaration resolveDeclaration(String identifier) {
return null;
}
public boolean invokesConsequence(String consequenceName) {
return consequence.invokesConsequence(consequenceName) || ( elseBranch != null && elseBranch.invokesConsequence(consequenceName) );
}
/* (non-Javadoc)
* @see java.lang.Object#hashCode()
*/
@Override
public int hashCode() {
return 31 * condition.hashCode() + 37 * consequence.hashCode();
}
/* (non-Javadoc)
* @see java.lang.Object#equals(java.lang.Object)
*/
@Override
public boolean equals(Object obj) {
if ( this == obj ) return true;
if ( obj == null ) return false;
if ( getClass() != obj.getClass() ) return false;
final ConditionalBranch other = (ConditionalBranch) obj;
return condition.equals( other.condition ) && consequence.equals( other.consequence );
}
@Override
public String toString() {
return "if ( " + condition + " ) " + consequence;
}
public boolean isPatternScopeDelimiter() {
return false;
}
public EvalCondition getEvalCondition() {
return condition;
}
public NamedConsequence getNamedConsequence() {
return consequence;
}
public ConditionalBranch getElseBranch() {
return elseBranch;
}
}