001 /******************************************************************************* 002 * Portions created by Sebastian Thomschke are copyright (c) 2005-2011 Sebastian 003 * Thomschke. 004 * 005 * All Rights Reserved. This program and the accompanying materials 006 * are made available under the terms of the Eclipse Public License v1.0 007 * which accompanies this distribution, and is available at 008 * http://www.eclipse.org/legal/epl-v10.html 009 * 010 * Contributors: 011 * Sebastian Thomschke - initial implementation. 012 *******************************************************************************/ 013 package net.sf.oval.guard; 014 015 import java.lang.reflect.AccessibleObject; 016 import java.lang.reflect.Constructor; 017 import java.lang.reflect.Method; 018 import java.util.WeakHashMap; 019 020 import net.sf.oval.exception.ReflectionException; 021 022 /** 023 * This implementation determines the names of constructor and method parameters by simply enumerating them based on there index: 024 * arg0,arg1,arg2,.. 025 * @author Sebastian Thomschke 026 */ 027 public class ParameterNameResolverEnumerationImpl implements ParameterNameResolver 028 { 029 private final WeakHashMap<AccessibleObject, String[]> parameterNamesCache = new WeakHashMap<AccessibleObject, String[]>(); 030 031 /** 032 * {@inheritDoc} 033 */ 034 public String[] getParameterNames(final Constructor< ? > constructor) throws ReflectionException 035 { 036 /* 037 * intentionally the following code is not synchronized 038 */ 039 String[] parameterNames = parameterNamesCache.get(constructor); 040 if (parameterNames == null) 041 { 042 final int parameterCount = constructor.getParameterTypes().length; 043 parameterNames = new String[parameterCount]; 044 for (int i = 0; i < parameterCount; i++) 045 { 046 parameterNames[i] = "arg" + i; 047 } 048 parameterNamesCache.put(constructor, parameterNames); 049 } 050 return parameterNames; 051 } 052 053 /** 054 * {@inheritDoc} 055 */ 056 public String[] getParameterNames(final Method method) throws ReflectionException 057 { 058 /* 059 * intentionally the following code is not synchronized 060 */ 061 String[] parameterNames = parameterNamesCache.get(method); 062 if (parameterNames == null) 063 { 064 final int parameterCount = method.getParameterTypes().length; 065 parameterNames = new String[parameterCount]; 066 for (int i = 0; i < parameterCount; i++) 067 { 068 parameterNames[i] = "arg" + i; 069 } 070 parameterNamesCache.put(method, parameterNames); 071 } 072 return parameterNames; 073 } 074 }