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'rapiddweller Script' is an open source software library for resolving Java-like script expressions, forked from Databene Scripts written by Volker Bergmann.

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/*
 * Copyright (C) 2011-2014 Volker Bergmann ([email protected]).
 * All rights reserved.
 *
 * 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 com.rapiddweller.script.expression;

import com.rapiddweller.script.Expression;

/**
 * Abstract parent class for expression that evaluate two terms.

 * 

 * Created at 06.10.2009 14:26:04
 * @since 0.5.0
 * @author Volker Bergmann
 */

public abstract class BinaryExpression implements WrapperExpression {

	protected String symbol;
	protected Expression term1;
	protected Expression term2;

	public BinaryExpression(Expression term1, Expression term2) {
		this(null, term1, term2);
    }
	
	public BinaryExpression(String symbol, Expression term1, Expression term2) {
		this.symbol = symbol;
	    this.term1 = term1;
	    this.term2 = term2;
    }
	
	@Override
	public Expression[] getSourceExpressions() {
		return new Expression[] { term1, term2 };
	}
	
	@Override
	public boolean isConstant() {
	    return term1.isConstant() && term2.isConstant();
	}
	
	@Override
	public String toString() {
		return "(" + term1 + " " + symbol + " " + term2 + ")";
	}
	
}