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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[] 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          Class[] realParameterTypes = metaMethod.getParameterTypes();
60          int size = realParameterTypes.length;
61          if (size <= 1) {
62              logicalParameterTypes = EMPTY_TYPE_ARRAY;
63          }
64          else {
65              logicalParameterTypes = new Class[--size];
66              System.arraycopy(realParameterTypes, 1, logicalParameterTypes, 0, size);
67          }
68      }
69  
70      public Class 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[] getParameterTypes() {
83          return logicalParameterTypes;
84      }
85  
86      public Class[] getBytecodeParameterTypes() {
87          return super.getParameterTypes();
88      }
89  
90      public Object invoke(Object object, Object[] arguments) throws Exception {
91          int size = arguments.length;
92          Object[] newArguments = new Object[size + 1];
93          System.arraycopy(arguments, 0, newArguments, 1, size);
94          newArguments[0] = null;
95          return metaMethod.invoke(null, newArguments);
96      }
97  }