Source Code Cross Referenced for NewStaticMetaMethod.java in  » Scripting » groovy-1.0 » org » codehaus » groovy » runtime » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Scripting » groovy 1.0 » org.codehaus.groovy.runtime 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * $Id: NewStaticMetaMethod.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:        /**
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: 4550 $
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:                init();
060:            }
061:
062:            public NewStaticMetaMethod(String name, Class declaringClass,
063:                    Class[] parameterTypes, Class returnType, int modifiers) {
064:                super (name, declaringClass, parameterTypes, returnType,
065:                        modifiers);
066:                this .metaMethod = new MetaMethod(name, declaringClass,
067:                        parameterTypes, returnType, modifiers);
068:                init();
069:            }
070:
071:            private void init() {
072:                Class[] realParameterTypes = metaMethod.getParameterTypes();
073:                int size = realParameterTypes != null ? realParameterTypes.length
074:                        : 0;
075:                if (size <= 1) {
076:                    logicalParameterTypes = EMPTY_TYPE_ARRAY;
077:                } else {
078:                    logicalParameterTypes = new Class[--size];
079:                    System.arraycopy(realParameterTypes, 1,
080:                            logicalParameterTypes, 0, size);
081:                }
082:            }
083:
084:            public Class getDeclaringClass() {
085:                return getBytecodeParameterTypes()[0];
086:            }
087:
088:            public boolean isStatic() {
089:                return true;
090:            }
091:
092:            public int getModifiers() {
093:                return super .getModifiers();
094:            }
095:
096:            public Class[] getParameterTypes() {
097:                return logicalParameterTypes;
098:            }
099:
100:            public Class[] getBytecodeParameterTypes() {
101:                return super .getParameterTypes();
102:            }
103:
104:            public Object invoke(Object object, Object[] arguments) {
105:                int size = arguments.length;
106:                Object[] newArguments = new Object[size + 1];
107:                System.arraycopy(arguments, 0, newArguments, 1, size);
108:                newArguments[0] = null;
109:                return metaMethod.invoke(null, newArguments);
110:            }
111:        }
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