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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.qpid.filter;
/**
* An expression which performs an operation on two expression values.
*/
public abstract class BinaryExpression implements Expression
{
protected Expression left;
protected Expression right;
public BinaryExpression(Expression left, Expression right)
{
this.left = left;
this.right = right;
}
public Expression getLeft()
{
return left;
}
public Expression getRight()
{
return right;
}
/**
* @see Object#toString()
*/
public String toString()
{
return "(" + left.toString() + " " + getExpressionSymbol() + " " + right.toString() + ")";
}
/**
* TODO: more efficient hashCode()
*
* @see Object#hashCode()
*/
public int hashCode()
{
return toString().hashCode();
}
/**
* TODO: more efficient hashCode()
*
* @see Object#equals(Object)
*/
public boolean equals(Object o)
{
if ((o == null) || !this.getClass().equals(o.getClass()))
{
return false;
}
return toString().equals(o.toString());
}
/**
* Returns the symbol that represents this binary expression. For example, addition is
* represented by "+"
*
* @return
*/
public abstract String getExpressionSymbol();
/**
* @param expression
*/
public void setRight(Expression expression)
{
right = expression;
}
/**
* @param expression
*/
public void setLeft(Expression expression)
{
left = expression;
}
}
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