001: /*
002: * $Id: NewInstanceMetaMethod.java 4550 2006-12-21 22:22:40Z blackdrag $
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: import java.lang.reflect.Modifier;
040:
041: /**
042: * A MetaMethod implementation where the underlying method is really a static
043: * helper method on some class but it appears to be an instance method on a class.
044: *
045: * This implementation is used to add new methods to the JDK writing them as normal
046: * static methods with the first parameter being the class on which the method is added.
047: *
048: * @author <a href="mailto:james@coredevelopers.net">James Strachan</a>
049: * @version $Revision: 4550 $
050: */
051: public class NewInstanceMetaMethod extends MetaMethod {
052:
053: private static final Class[] EMPTY_TYPE_ARRAY = {};
054:
055: private MetaMethod metaMethod;
056: private Class[] logicalParameterTypes;
057:
058: public NewInstanceMetaMethod(MetaMethod metaMethod) {
059: super (metaMethod);
060: this .metaMethod = metaMethod;
061: init();
062: }
063:
064: public NewInstanceMetaMethod(String name, Class declaringClass,
065: Class[] parameterTypes, Class returnType, int modifiers) {
066: super (name, declaringClass, parameterTypes, returnType,
067: modifiers);
068: this .metaMethod = new MetaMethod(name, declaringClass,
069: parameterTypes, returnType, modifiers);
070: init();
071: }
072:
073: private void init() {
074: Class[] realParameterTypes = metaMethod.getParameterTypes();
075: int size = realParameterTypes != null ? realParameterTypes.length
076: : 0;
077: if (size <= 1) {
078: logicalParameterTypes = EMPTY_TYPE_ARRAY;
079: } else {
080: logicalParameterTypes = new Class[--size];
081: System.arraycopy(realParameterTypes, 1,
082: logicalParameterTypes, 0, size);
083: }
084: }
085:
086: public Class getDeclaringClass() {
087: return getBytecodeParameterTypes()[0];
088: }
089:
090: public boolean isStatic() {
091: return false;
092: }
093:
094: public int getModifiers() {
095: // lets clear the static bit
096: return super .getModifiers() ^ Modifier.STATIC;
097: }
098:
099: public Class[] getParameterTypes() {
100: return logicalParameterTypes;
101: }
102:
103: public Class[] getBytecodeParameterTypes() {
104: return super .getParameterTypes();
105: }
106:
107: public Object invoke(Object object, Object[] arguments) {
108: // we need to cheat using the type
109: int size = arguments.length;
110: Object[] newArguments = new Object[size + 1];
111: newArguments[0] = object;
112: System.arraycopy(arguments, 0, newArguments, 1, size);
113: return metaMethod.invoke(null, newArguments);
114: }
115:
116: public Class getOwnerClass() {
117: return getBytecodeParameterTypes()[0];
118: }
119: }
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