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 }