001: /*
002: $Id: ClassExtender.java 259 2003-11-04 12:00:48Z jstrachan $
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: * A helper class used by the runtime to allow Groovy classes to be extended at runtime
055: *
056: * @author <a href="mailto:james@coredevelopers.net">James Strachan</a>
057: * @version $Revision: 259 $
058: */
059: public class ClassExtender {
060: private Map variables;
061: private Map methods;
062:
063: public synchronized Object get(String name) {
064: if (variables != null) {
065: return variables.get(name);
066: }
067: return null;
068: }
069:
070: public synchronized void set(String name, Object value) {
071: if (variables == null) {
072: variables = createMap();
073: }
074: variables.put(name, value);
075: }
076:
077: public synchronized void remove(String name) {
078: if (variables != null) {
079: variables.remove(name);
080: }
081: }
082:
083: public void call(String name, Object params) {
084: Closure closure = null;
085: synchronized (this ) {
086: if (methods != null) {
087: closure = (Closure) methods.get(name);
088: }
089: }
090: if (closure != null) {
091: closure.call(params);
092: }
093: /*
094: else {
095: throw DoesNotUnderstandException();
096: }
097: */
098: }
099:
100: public synchronized void addMethod(String name, Closure closure) {
101: if (methods == null) {
102: methods = createMap();
103: }
104: methods.put(name, methods);
105: }
106:
107: public synchronized void removeMethod(String name) {
108: if (methods != null) {
109: methods.remove(name);
110: }
111: }
112:
113: protected Map createMap() {
114: return new HashMap();
115: }
116: }
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