001    /*
002     * $Id: NewStaticMetaMethod.java,v 1.5 2004/05/18 06:15:45 spullara Exp $
003     *
004     * Copyright 2003 (C) James Strachan and Bob Mcwhirter. All Rights Reserved.
005     *
006     * Redistribution and use of this software and associated documentation
007     * ("Software"), with or without modification, are permitted provided that the
008     * following conditions are met:
009     *  1. Redistributions of source code must retain copyright statements and
010     * notices. Redistributions must also contain a copy of this document.
011     *  2. Redistributions in binary form must reproduce the above copyright
012     * notice, this list of conditions and the following disclaimer in the
013     * documentation and/or other materials provided with the distribution.
014     *  3. The name "groovy" must not be used to endorse or promote products
015     * derived from this Software without prior written permission of The Codehaus.
016     * For written permission, please contact info@codehaus.org.
017     *  4. Products derived from this Software may not be called "groovy" nor may
018     * "groovy" appear in their names without prior written permission of The
019     * Codehaus. "groovy" is a registered trademark of The Codehaus.
020     *  5. Due credit should be given to The Codehaus - http://groovy.codehaus.org/
021     *
022     * THIS SOFTWARE IS PROVIDED BY THE CODEHAUS AND CONTRIBUTORS ``AS IS'' AND ANY
023     * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
024     * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
025     * DISCLAIMED. IN NO EVENT SHALL THE CODEHAUS OR ITS CONTRIBUTORS BE LIABLE FOR
026     * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
027     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
028     * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
029     * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
030     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
031     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
032     * DAMAGE.
033     *
034     */
035    package org.codehaus.groovy.runtime;
036    
037    import groovy.lang.MetaMethod;
038    
039    /**
040     * A MetaMethod implementation where the underlying method is really a static
041     * helper method on some class.
042     * 
043     * This implementation is used to add new static methods to the JDK writing them as normal
044     * static methods with the first parameter being the class on which the method is added.
045     * 
046     * @author Guillaume Laforge
047     * @version $Revision: 1.5 $
048     */
049    public class NewStaticMetaMethod extends MetaMethod {
050    
051        private static final Class[] EMPTY_TYPE_ARRAY = {};
052        
053        private MetaMethod metaMethod;
054        private Class[] logicalParameterTypes;
055    
056        public NewStaticMetaMethod(MetaMethod metaMethod) {
057            super(metaMethod);
058            this.metaMethod = metaMethod;
059            Class[] realParameterTypes = metaMethod.getParameterTypes();
060            int size = realParameterTypes.length;
061            if (size <= 1) {
062                logicalParameterTypes = EMPTY_TYPE_ARRAY;
063            }
064            else {
065                logicalParameterTypes = new Class[--size];
066                System.arraycopy(realParameterTypes, 1, logicalParameterTypes, 0, size);
067            }
068        }
069    
070        public Class getDeclaringClass() {
071            return getBytecodeParameterTypes()[0];
072        }
073    
074        public boolean isStatic() {
075            return true;
076        }
077    
078        public int getModifiers() {
079            return super.getModifiers();
080        }
081    
082        public Class[] getParameterTypes() {
083            return logicalParameterTypes;
084        }
085    
086        public Class[] getBytecodeParameterTypes() {
087            return super.getParameterTypes();
088        }
089    
090        public Object invoke(Object object, Object[] arguments) throws Exception {
091            int size = arguments.length;
092            Object[] newArguments = new Object[size + 1];
093            System.arraycopy(arguments, 0, newArguments, 1, size);
094            newArguments[0] = null;
095            return metaMethod.invoke(null, newArguments);
096        }
097    }