1 /* 2 $Id: ClassExtender.java,v 1.4 2003/11/04 12:00:47 jstrachan Exp $ 3 4 Copyright 2003 (C) James Strachan and Bob Mcwhirter. All Rights Reserved. 5 6 Redistribution and use of this software and associated documentation 7 ("Software"), with or without modification, are permitted provided 8 that the following conditions are met: 9 10 1. Redistributions of source code must retain copyright 11 statements and notices. Redistributions must also contain a 12 copy of this document. 13 14 2. Redistributions in binary form must reproduce the 15 above copyright notice, this list of conditions and the 16 following disclaimer in the documentation and/or other 17 materials provided with the distribution. 18 19 3. The name "groovy" must not be used to endorse or promote 20 products derived from this Software without prior written 21 permission of The Codehaus. For written permission, 22 please contact info@codehaus.org. 23 24 4. Products derived from this Software may not be called "groovy" 25 nor may "groovy" appear in their names without prior written 26 permission of The Codehaus. "groovy" is a registered 27 trademark of The Codehaus. 28 29 5. Due credit should be given to The Codehaus - 30 http://groovy.codehaus.org/ 31 32 THIS SOFTWARE IS PROVIDED BY THE CODEHAUS AND CONTRIBUTORS 33 ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT 34 NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND 35 FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 36 THE CODEHAUS OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 37 INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 38 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 39 SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 40 HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 41 STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 42 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 43 OF THE POSSIBILITY OF SUCH DAMAGE. 44 45 */ 46 package org.codehaus.groovy.runtime; 47 48 import groovy.lang.Closure; 49 50 import java.util.HashMap; 51 import java.util.Map; 52 53 54 /*** 55 * A helper class used by the runtime to allow Groovy classes to be extended at runtime 56 * 57 * @author <a href="mailto:james@coredevelopers.net">James Strachan</a> 58 * @version $Revision: 1.4 $ 59 */ 60 public class ClassExtender { 61 private Map variables; 62 private Map methods; 63 64 public synchronized Object get(String name) { 65 if (variables != null) { 66 return variables.get(name); 67 } 68 return null; 69 } 70 71 public synchronized void set(String name, Object value) { 72 if (variables == null) { 73 variables = createMap(); 74 } 75 variables.put(name, value); 76 } 77 78 public synchronized void remove(String name) { 79 if (variables != null) { 80 variables.remove(name); 81 } 82 } 83 84 public void call(String name, Object params) { 85 Closure closure = null; 86 synchronized (this) { 87 if (methods != null) { 88 closure = (Closure) methods.get(name); 89 } 90 } 91 if (closure != null) { 92 closure.call(params); 93 } 94 /* 95 else { 96 throw DoesNotUnderstandException(); 97 } 98 */ 99 } 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 }