/*
* Copyright 2008 Fedora Commons
*
* 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 org.mulgara.sparql.parser.cst;
/**
* Absract class to provide basic functionality of an N-ary, associative operation.
*
* @created Feb 13, 2008
* @author Paula Gearon
* @copyright © 2008 <a href="http://www.fedora-commons.org/">Fedora Commons</a>
* @licence <a href="{@docRoot}/../LICENCE.txt">Apache License, Version 2.0</a>
*/
public abstract class AbstractBinaryOperator implements Expression {
/** The first operand */
protected Expression op1;
/** The second operand */
protected Expression op2;
/**
* Creates the operation.
*/
public AbstractBinaryOperator(Expression op1, Expression op2) {
this.op1 = op1;
this.op2 = op2;
}
/**
* @return the first operand for this operation
*/
public Expression getFirstOperand() {
return op1;
}
/**
* @return the second operand for this operation
*/
public Expression getSecondOperand() {
return op2;
}
/**
* @see org.mulgara.sparql.parser.cst.Node#getImage()
* Used for Prefix notation. Override for infix notation.
*/
public String getImage() {
StringBuffer result = new StringBuffer(getOperatorString());
result.append(op1.getImage());
result.append(", ");
result.append(op2.getImage());
result.append(")");
return result.toString();
}
/**
* A string representation of the operator for this operator
* @return The operator as a string
*/
protected abstract String getOperatorString();
}