- /*
- * Copyright 1999-2004 The Apache Software Foundation
- *
- * Licensed 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.JXPathException;
- 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: 1.11 $ $Date: 2004/02/29 14:17:44 $
- */
- public class MethodFunction implements Function {
-
- private Method method;
- private static final Object EMPTY_ARRAY[] = new Object[0];
-
- 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 JXPathException("Cannot invoke " + method, ex);
- }
- }
-
- public String toString() {
- return method.toString();
- }
- }