001 /* 002 $Id: ClassExtender.java,v 1.4 2003/11/04 12:00:47 jstrachan Exp $ 003 004 Copyright 2003 (C) James Strachan and Bob Mcwhirter. All Rights Reserved. 005 006 Redistribution and use of this software and associated documentation 007 ("Software"), with or without modification, are permitted provided 008 that the following conditions are met: 009 010 1. Redistributions of source code must retain copyright 011 statements and notices. Redistributions must also contain a 012 copy of this document. 013 014 2. Redistributions in binary form must reproduce the 015 above copyright notice, this list of conditions and the 016 following disclaimer in the documentation and/or other 017 materials provided with the distribution. 018 019 3. The name "groovy" must not be used to endorse or promote 020 products derived from this Software without prior written 021 permission of The Codehaus. For written permission, 022 please contact info@codehaus.org. 023 024 4. Products derived from this Software may not be called "groovy" 025 nor may "groovy" appear in their names without prior written 026 permission of The Codehaus. "groovy" is a registered 027 trademark of The Codehaus. 028 029 5. Due credit should be given to The Codehaus - 030 http://groovy.codehaus.org/ 031 032 THIS SOFTWARE IS PROVIDED BY THE CODEHAUS AND CONTRIBUTORS 033 ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT 034 NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND 035 FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 036 THE CODEHAUS OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 037 INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 038 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 039 SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 040 HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 041 STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 042 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 043 OF THE POSSIBILITY OF SUCH DAMAGE. 044 045 */ 046 package org.codehaus.groovy.runtime; 047 048 import groovy.lang.Closure; 049 050 import java.util.HashMap; 051 import java.util.Map; 052 053 054 /** 055 * A helper class used by the runtime to allow Groovy classes to be extended at runtime 056 * 057 * @author <a href="mailto:james@coredevelopers.net">James Strachan</a> 058 * @version $Revision: 1.4 $ 059 */ 060 public class ClassExtender { 061 private Map variables; 062 private Map methods; 063 064 public synchronized Object get(String name) { 065 if (variables != null) { 066 return variables.get(name); 067 } 068 return null; 069 } 070 071 public synchronized void set(String name, Object value) { 072 if (variables == null) { 073 variables = createMap(); 074 } 075 variables.put(name, value); 076 } 077 078 public synchronized void remove(String name) { 079 if (variables != null) { 080 variables.remove(name); 081 } 082 } 083 084 public void call(String name, Object params) { 085 Closure closure = null; 086 synchronized (this) { 087 if (methods != null) { 088 closure = (Closure) methods.get(name); 089 } 090 } 091 if (closure != null) { 092 closure.call(params); 093 } 094 /* 095 else { 096 throw DoesNotUnderstandException(); 097 } 098 */ 099 } 100 101 public synchronized void addMethod(String name, Closure closure) { 102 if (methods == null) { 103 methods = createMap(); 104 } 105 methods.put(name, methods); 106 } 107 108 public synchronized void removeMethod(String name) { 109 if (methods != null) { 110 methods.remove(name); 111 } 112 } 113 114 protected Map createMap() { 115 return new HashMap(); 116 } 117 }