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 /*
  * 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.newplan.logical.expression;
Superclass for all unary expressions
public abstract class UnaryExpression extends LogicalExpression {
    
    
Will add this operator to the plan and connect it to the left and right hand side operators.

Parameters:
name of the operator
plan plan this operator is part of
exp expression that this expression operators on
    public UnaryExpression(String name,
                            OperatorPlan plan,
                            LogicalExpression exp) {
        super(nameplan);
        plan.add(this);
        plan.connect(thisexp);        
    }

    
Get the expression that this unary expression operators on.

Returns:
expression on the left hand side
Throws:
org.apache.pig.impl.logicalLayer.FrontendException
    public LogicalExpression getExpression() throws FrontendException {
        List<Operatorpreds = .getSuccessors(this);
        if(preds == null) {
            return null;
        }
        return (LogicalExpression)preds.get(0);
    }
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