| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.commons.jxpath.functions; |
| |
| import java.lang.reflect.InvocationTargetException; |
| 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.JXPathInvalidAccessException; |
| import org.apache.commons.jxpath.util.TypeUtils; |
| import org.apache.commons.jxpath.util.ValueUtils; |
| |
| /** |
| * An XPath extension function implemented as an individual Java method. |
| * |
| * @author Dmitri Plotnikov |
| * @version $Revision$ $Date$ |
| */ |
| public class MethodFunction implements Function { |
| |
| private Method method; |
| private static final Object[] EMPTY_ARRAY = new Object[0]; |
| |
| /** |
| * Create a new MethodFunction. |
| * @param method implementing Method |
| */ |
| public MethodFunction(Method method) { |
| this.method = ValueUtils.getAccessibleMethod(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 (Throwable ex) { |
| if (ex instanceof InvocationTargetException) { |
| ex = ((InvocationTargetException) ex).getTargetException(); |
| } |
| throw new JXPathInvalidAccessException("Cannot invoke " + method, |
| ex); |
| } |
| } |
| |
| public String toString() { |
| return method.toString(); |
| } |
| } |