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Java > Open Source Codes > org > codehaus > groovy > runtime > NewStaticMetaMethod


1 /*
2  * $Id: NewStaticMetaMethod.java,v 1.5 2004/05/18 06:15:45 spullara 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 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: 1.5 $
48  */

49 public class NewStaticMetaMethod extends MetaMethod {
50
51     private static final Class JavaDoc[] EMPTY_TYPE_ARRAY = {};
52     
53     private MetaMethod metaMethod;
54     private Class JavaDoc[] logicalParameterTypes;
55
56     public NewStaticMetaMethod(MetaMethod metaMethod) {
57         super(metaMethod);
58         this.metaMethod = metaMethod;
59         Class JavaDoc[] realParameterTypes = metaMethod.getParameterTypes();
60         int size = realParameterTypes.length;
61         if (size <= 1) {
62             logicalParameterTypes = EMPTY_TYPE_ARRAY;
63         }
64         else {
65             logicalParameterTypes = new Class JavaDoc[--size];
66             System.arraycopy(realParameterTypes, 1, logicalParameterTypes, 0, size);
67         }
68     }
69
70     public Class JavaDoc getDeclaringClass() {
71         return getBytecodeParameterTypes()[0];
72     }
73
74     public boolean isStatic() {
75         return true;
76     }
77
78     public int getModifiers() {
79         return super.getModifiers();
80     }
81
82     public Class JavaDoc[] getParameterTypes() {
83         return logicalParameterTypes;
84     }
85
86     public Class JavaDoc[] getBytecodeParameterTypes() {
87         return super.getParameterTypes();
88     }
89
90     public Object JavaDoc invoke(Object JavaDoc object, Object JavaDoc[] arguments) throws Exception JavaDoc {
91         int size = arguments.length;
92         Object JavaDoc[] newArguments = new Object JavaDoc[size + 1];
93         System.arraycopy(arguments, 0, newArguments, 1, size);
94         newArguments[0] = null;
95         return metaMethod.invoke(null, newArguments);
96     }
97 }
98
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