/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.apache.pig.backend.hadoop.executionengine.physicalLayer.plans;
import org.apache.pig.impl.logicalLayer.FrontendException;
import org.apache.pig.newplan.Operator;
import org.apache.pig.newplan.OperatorPlan;
/**
* Used for finding/representing a pattern in the plan
* This class represents a node in the pattern
*/
public class PatternNode extends Operator{
public PatternNode(OperatorPlan p) {
super("pattern", p);
}
private static final long serialVersionUID = 1L;
/**
* Does this node have to be the leaf node
*/
private boolean isLeafNode = false;
/**
* Does this node have to be the source node
*/
private boolean isSourceNode = false;
// /**
// * Is this node optional
// */
// private boolean isOptional;
/**
* The class this node in plan should be an instance of
*/
private Class<?> className;
/**
* The node in plan that this pattern node matched
*/
private Object match;
/**
* @return the isLeafNode
*/
public boolean isLeafNode() {
return isLeafNode;
}
/**
* Set isLeafNode to true if the node must be a source
* @param isLeafNode
*/
public void setLeafNode(boolean isLeafNode) {
this.isLeafNode = isLeafNode;
}
/**
* @return the isSourceNode
*/
public boolean isSourceNode() {
return isSourceNode;
}
/**
* Set isSourceNode to true if the node must be a source
* @param isSourceNode
*/
public void setSourceNode(boolean isSourceNode) {
this.isSourceNode = isSourceNode;
}
/**
* @return the className
*/
public Class<?> getClassName() {
return className;
}
/**
* @param className the className to set
*/
public void setClassName(Class<?> className) {
this.className = className;
}
/**
* @return the match
*/
public Object getMatch() {
return match;
}
/**
* @param match the match to set
*/
public void setMatch(Object match) {
this.match = match;
}
@Override
public void accept(org.apache.pig.newplan.PlanVisitor v)
throws FrontendException {
//should not be called
throw new RuntimeException("function not implemented");
}
@Override
public boolean isEqual(Operator operator) throws FrontendException {
//dummy
return false;
}
@Override
public String toString(){
String str ="";
if(className != null){
str = className.toString();
}
return str;
}
}