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 }