001 /*--------------------------------------------------------------------------+ 002 $Id: FormalParameterComparator.java 26283 2010-02-18 11:18:57Z juergens $ 003 | | 004 | Copyright 2005-2010 Technische Universitaet Muenchen | 005 | | 006 | Licensed under the Apache License, Version 2.0 (the "License"); | 007 | you may not use this file except in compliance with the License. | 008 | You may obtain a copy of the License at | 009 | | 010 | http://www.apache.org/licenses/LICENSE-2.0 | 011 | | 012 | Unless required by applicable law or agreed to in writing, software | 013 | distributed under the License is distributed on an "AS IS" BASIS, | 014 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | 015 | See the License for the specific language governing permissions and | 016 | limitations under the License. | 017 +--------------------------------------------------------------------------*/ 018 package edu.tum.cs.commons.reflect; 019 020 import java.util.Comparator; 021 022 /** 023 * This comparator orders formal parameters by their position within the formal 024 * parameter list of the defining method. This comparator raises an exception if 025 * the the compared parameters do not belong to the same method. 026 * 027 * 028 * @author Florian Deissenboeck 029 * @author $Author: juergens $ 030 * @version $Rev: 26283 $ 031 * @levd.rating GREEN Hash: 06C5FDF68F8F0EF99EE068876259CBC7 032 */ 033 public class FormalParameterComparator implements Comparator<FormalParameter> { 034 035 /** 036 * Compae formal parameters by their position within the formal parameter 037 * list of the defining method. 038 * 039 * @throws IllegalArgumentException 040 * if parameters belong to different methods. 041 */ 042 public int compare(FormalParameter p1, FormalParameter p2) 043 throws IllegalArgumentException { 044 if (!p1.getMethod().equals(p2.getMethod())) { 045 throw new IllegalArgumentException( 046 "Parameters must belong to same method"); 047 } 048 return p1.getPosition() - p2.getPosition(); 049 } 050 }