| /* |
| * 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.expressionOperators; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import org.apache.pig.data.Tuple; |
| import org.apache.pig.impl.plan.OperatorKey; |
| import org.apache.pig.impl.util.IdentityHashSet; |
| |
| /** |
| * A base class for all Binary expression operators. |
| * Supports the lhs and rhs operators which are used |
| * to fetch the inputs and apply the appropriate operation |
| * with the appropriate type. |
| * |
| */ |
| public abstract class BinaryExpressionOperator extends ExpressionOperator { |
| private static final long serialVersionUID = 1L; |
| |
| protected ExpressionOperator lhs; |
| protected ExpressionOperator rhs; |
| private transient List<ExpressionOperator> child; |
| |
| public BinaryExpressionOperator(OperatorKey k) { |
| this(k,-1); |
| } |
| |
| public BinaryExpressionOperator(OperatorKey k, int rp) { |
| super(k, rp); |
| } |
| |
| public ExpressionOperator getLhs() { |
| return lhs; |
| } |
| |
| /** |
| * Get the child expressions of this expression |
| */ |
| public List<ExpressionOperator> getChildExpressions() { |
| if (child == null) { |
| child = new ArrayList<ExpressionOperator>(); |
| child.add(lhs); |
| child.add(rhs); |
| } |
| return child; |
| } |
| |
| @Override |
| public boolean supportsMultipleInputs() { |
| return true; |
| } |
| |
| public void setLhs(ExpressionOperator lhs) { |
| this.lhs = lhs; |
| } |
| |
| public ExpressionOperator getRhs() { |
| return rhs; |
| } |
| |
| public void setRhs(ExpressionOperator rhs) { |
| this.rhs = rhs; |
| } |
| |
| protected void cloneHelper(BinaryExpressionOperator op) { |
| // Don't clone these, as they are just references to things already in |
| // the plan. |
| lhs = op.lhs; |
| rhs = op.rhs; |
| super.cloneHelper(op); |
| } |
| |
| @Override |
| public Tuple illustratorMarkup(Object in, Object out, int eqClassIndex) { |
| return null; |
| } |
| } |