| /** |
| * |
| * 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.server.filter; |
| // |
| // Based on like named file from r450141 of the Apache ActiveMQ project <http://www.activemq.org/site/home.html> |
| // |
| |
| /** |
| * An expression which performs an operation on two expression values. |
| */ |
| public abstract class BinaryExpression<E extends Exception> implements Expression<E> |
| { |
| protected Expression<E> left; |
| protected Expression<E> right; |
| |
| public BinaryExpression(Expression<E> left, Expression<E> right) |
| { |
| this.left = left; |
| this.right = right; |
| } |
| |
| public Expression<E> getLeft() |
| { |
| return left; |
| } |
| |
| public Expression<E> getRight() |
| { |
| return right; |
| } |
| |
| /** |
| * @see java.lang.Object#toString() |
| */ |
| public String toString() |
| { |
| return "(" + left.toString() + " " + getExpressionSymbol() + " " + right.toString() + ")"; |
| } |
| |
| /** |
| * TODO: more efficient hashCode() |
| * |
| * @see java.lang.Object#hashCode() |
| */ |
| public int hashCode() |
| { |
| return toString().hashCode(); |
| } |
| |
| /** |
| * TODO: more efficient hashCode() |
| * |
| * @see java.lang.Object#equals(java.lang.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<E> expression) |
| { |
| right = expression; |
| } |
| |
| /** |
| * @param expression |
| */ |
| public void setLeft(Expression<E> expression) |
| { |
| left = expression; |
| } |
| |
| } |