1 /*
2 * $Id: NewStaticMetaMethod.java 4550 2006-12-21 22:22:40Z blackdrag $
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 that the
8 * following conditions are met:
9 * 1. Redistributions of source code must retain copyright statements and
10 * notices. Redistributions must also contain a copy of this document.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. The name "groovy" must not be used to endorse or promote products
15 * derived from this Software without prior written permission of The Codehaus.
16 * For written permission, please contact info@codehaus.org.
17 * 4. Products derived from this Software may not be called "groovy" nor may
18 * "groovy" appear in their names without prior written permission of The
19 * Codehaus. "groovy" is a registered trademark of The Codehaus.
20 * 5. Due credit should be given to The Codehaus - http://groovy.codehaus.org/
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE CODEHAUS AND CONTRIBUTORS ``AS IS'' AND ANY
23 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
24 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
25 * DISCLAIMED. IN NO EVENT SHALL THE CODEHAUS OR ITS CONTRIBUTORS BE LIABLE FOR
26 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
28 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
29 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
32 * DAMAGE.
33 *
34 */
35 package org.codehaus.groovy.runtime;
36
37 import groovy.lang.MetaMethod;
38
39 /***
40 * A MetaMethod implementation where the underlying method is really a static
41 * helper method on some class.
42 *
43 * This implementation is used to add new static methods to the JDK writing them as normal
44 * static methods with the first parameter being the class on which the method is added.
45 *
46 * @author Guillaume Laforge
47 * @version $Revision: 4550 $
48 */
49 public class NewStaticMetaMethod extends MetaMethod {
50
51 private static final Class[] EMPTY_TYPE_ARRAY = {};
52
53 private MetaMethod metaMethod;
54 private Class[] logicalParameterTypes;
55
56 public NewStaticMetaMethod(MetaMethod metaMethod) {
57 super(metaMethod);
58 this.metaMethod = metaMethod;
59 init();
60 }
61
62 public NewStaticMetaMethod(String name, Class declaringClass, Class[] parameterTypes, Class returnType, int modifiers) {
63 super(name, declaringClass, parameterTypes, returnType, modifiers);
64 this.metaMethod = new MetaMethod(name, declaringClass, parameterTypes,returnType, modifiers);
65 init();
66 }
67
68 private void init() {
69 Class[] realParameterTypes = metaMethod.getParameterTypes();
70 int size = realParameterTypes!=null ? realParameterTypes.length : 0;
71 if (size <= 1) {
72 logicalParameterTypes = EMPTY_TYPE_ARRAY;
73 } else {
74 logicalParameterTypes = new Class[--size];
75 System.arraycopy(realParameterTypes, 1, logicalParameterTypes, 0, size);
76 }
77 }
78
79 public Class getDeclaringClass() {
80 return getBytecodeParameterTypes()[0];
81 }
82
83 public boolean isStatic() {
84 return true;
85 }
86
87 public int getModifiers() {
88 return super.getModifiers();
89 }
90
91 public Class[] getParameterTypes() {
92 return logicalParameterTypes;
93 }
94
95 public Class[] getBytecodeParameterTypes() {
96 return super.getParameterTypes();
97 }
98
99 public Object invoke(Object object, Object[] arguments) {
100 int size = arguments.length;
101 Object[] newArguments = new Object[size + 1];
102 System.arraycopy(arguments, 0, newArguments, 1, size);
103 newArguments[0] = null;
104 return metaMethod.invoke(null, newArguments);
105 }
106 }