| /* |
| * $Header: /home/jerenkrantz/tmp/commons/commons-convert/cvs/home/cvs/jakarta-commons//jxpath/src/java/org/apache/commons/jxpath/functions/MethodFunction.java,v 1.6 2002/05/08 00:40:00 dmitri Exp $ |
| * $Revision: 1.6 $ |
| * $Date: 2002/05/08 00:40:00 $ |
| * |
| * ==================================================================== |
| * The Apache Software License, Version 1.1 |
| * |
| * |
| * Copyright (c) 1999-2001 The Apache Software Foundation. All rights |
| * reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in |
| * the documentation and/or other materials provided with the |
| * distribution. |
| * |
| * 3. The end-user documentation included with the redistribution, if |
| * any, must include the following acknowlegement: |
| * "This product includes software developed by the |
| * Apache Software Foundation (http://www.apache.org/)." |
| * Alternately, this acknowlegement may appear in the software itself, |
| * if and wherever such third-party acknowlegements normally appear. |
| * |
| * 4. The names "The Jakarta Project", "Commons", and "Apache Software |
| * Foundation" must not be used to endorse or promote products derived |
| * from this software without prior written permission. For written |
| * permission, please contact apache@apache.org. |
| * |
| * 5. Products derived from this software may not be called "Apache" |
| * nor may "Apache" appear in their names without prior written |
| * permission of the Apache Group. |
| * |
| * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
| * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR |
| * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
| * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
| * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| * ==================================================================== |
| * |
| * This software consists of voluntary contributions made by many |
| * individuals on behalf of the Apache Software Foundation and was |
| * originally based on software copyright (c) 2001, Plotnix, Inc, |
| * <http://www.plotnix.com/>. |
| * For more information on the Apache Software Foundation, please see |
| * <http://www.apache.org/>. |
| */ |
| package org.apache.commons.jxpath.functions; |
| |
| import java.lang.reflect.Method; |
| import java.lang.reflect.Modifier; |
| |
| import org.apache.commons.jxpath.ExpressionContext; |
| import org.apache.commons.jxpath.Function; |
| import org.apache.commons.jxpath.JXPathException; |
| import org.apache.commons.jxpath.util.TypeUtils; |
| |
| /** |
| * @author Dmitri Plotnikov |
| * @version $Revision: 1.6 $ $Date: 2002/05/08 00:40:00 $ |
| */ |
| public class MethodFunction implements Function { |
| |
| private Method method; |
| private static final Object EMPTY_ARRAY[] = new Object[0]; |
| |
| public MethodFunction(Method method){ |
| this.method = method; |
| } |
| |
| public Object invoke(ExpressionContext context, Object[] parameters){ |
| try { |
| Object target; |
| Object[] args; |
| if (Modifier.isStatic(method.getModifiers())){ |
| target = null; |
| if (parameters == null){ |
| parameters = EMPTY_ARRAY; |
| } |
| int pi = 0; |
| Class types[] = method.getParameterTypes(); |
| if (types.length >= 1 && ExpressionContext.class.isAssignableFrom(types[0])){ |
| pi = 1; |
| } |
| args = new Object[parameters.length + pi]; |
| if (pi == 1){ |
| args[0] = context; |
| } |
| for (int i = 0; i < parameters.length; i++){ |
| args[i + pi] = TypeUtils.convert(parameters[i], types[i + pi]); |
| } |
| } |
| else { |
| int pi = 0; |
| Class types[] = method.getParameterTypes(); |
| if (types.length >= 1 && |
| ExpressionContext.class.isAssignableFrom(types[0])){ |
| pi = 1; |
| } |
| target = TypeUtils. |
| convert(parameters[0], method.getDeclaringClass()); |
| args = new Object[parameters.length - 1 + pi]; |
| if (pi == 1){ |
| args[0] = context; |
| } |
| for (int i = 1; i < parameters.length; i++){ |
| args[pi + i - 1] = |
| TypeUtils.convert(parameters[i], types[i + pi - 1]); |
| } |
| } |
| |
| return method.invoke(target, args); |
| } |
| catch (Exception exception){ |
| throw new JXPathException("Cannot invoke " + method, exception); |
| } |
| } |
| } |