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+/*
+ * Copyright (c) 2004 Ant-Contrib project. All rights reserved.
+ *
+ * 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 net.sf.antcontrib.util;
+
+import java.lang.reflect.Constructor;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import org.apache.tools.ant.BuildException;
+
+/**
+ * Utility class to handle reflection on java objects.
+ * Its main purpose is to allow ant-contrib classes
+ * to compile under ant1.5 but allow the classes to
+ * use ant1.6 classes and code if present.
+ * The class is a holder class for an object and
+ * uses java reflection to call methods on the objects.
+ * If things go wrong, BuildExceptions are thrown.
+ * @author Peter Reilly
+ */
+
+public class Reflector {
+ private Object obj;
+ /**
+ * Constructor for the wrapper using a classname
+ * @param name the classname of the object to construct.
+ */
+ public Reflector(String name) {
+ try {
+ Class clazz;
+ clazz = Class.forName(name);
+ Constructor constructor;
+ constructor = clazz.getConstructor(new Class[]{});
+ obj = constructor.newInstance(new Object[]{});
+ } catch (Throwable t) {
+ throw new BuildException(t);
+ }
+ }
+
+ /**
+ * Constructor using a passed in object.
+ * @param obj the object to wrap.
+ */
+
+ public Reflector(Object obj) {
+ this.obj = obj;
+ }
+
+ /**
+ * @return the wrapped object.
+ */
+ public Object getObject() {
+ return obj;
+ }
+
+ /**
+ * Call a method on the object with no parameters.
+ * @param methodName the name of the method to call
+ * @return the object returned by the method
+ */
+ public Object call(String methodName) {
+ try {
+ Method method;
+ method = obj.getClass().getMethod(
+ methodName, new Class[] {});
+ return method.invoke(obj, new Object[] {});
+ } catch (InvocationTargetException t) {
+ Throwable t2 = t.getTargetException();
+ if (t2 instanceof BuildException) {
+ throw (BuildException) t2;
+ }
+ throw new BuildException(t2);
+ } catch (Throwable t) {
+ throw new BuildException(t);
+ }
+ }
+
+ /**
+ * Call a method with an object using a specific
+ * type as for the method parameter.
+ * @param methodName the name of the method
+ * @param className the name of the class of the parameter of the method
+ * @param o the object to use as the argument of the method
+ * @return the object returned by the method
+ */
+ public Object callExplicit(
+ String methodName, String className, Object o) {
+ try {
+ Method method;
+ Class clazz = Class.forName(className);
+ method = obj.getClass().getMethod(
+ methodName, new Class[] {clazz});
+ return method.invoke(obj, new Object[] {o});
+ } catch (InvocationTargetException t) {
+ Throwable t2 = t.getTargetException();
+ if (t2 instanceof BuildException) {
+ throw (BuildException) t2;
+ }
+ throw new BuildException(t2);
+ } catch (Throwable t) {
+ throw new BuildException(t);
+ }
+ }
+
+ /**
+ * Call a method with an object using a specific
+ * type as for the method parameter.
+ * @param methodName the name of the method
+ * @param classType the class of the parameter of the method
+ * @param o the object to use as the argument of the method
+ * @return the object returned by the method
+ */
+ public Object callExplicit(
+ String methodName, Class classType, Object o) {
+ try {
+ Method method;
+ method = obj.getClass().getMethod(
+ methodName, new Class[] {classType});
+ return method.invoke(obj, new Object[] {o});
+ } catch (InvocationTargetException t) {
+ Throwable t2 = t.getTargetException();
+ if (t2 instanceof BuildException) {
+ throw (BuildException) t2;
+ }
+ throw new BuildException(t2);
+ } catch (Throwable t) {
+ throw new BuildException(t);
+ }
+ }
+
+ /**
+ * Call a method with one parameter.
+ * @param methodName the name of the method to call
+ * @param o the object to use as the parameter, this must
+ * be of the same type as the method parameter (not a subclass).
+ * @return the object returned by the method
+ */
+ public Object call(String methodName, Object o) {
+ try {
+ Method method;
+ method = obj.getClass().getMethod(
+ methodName, new Class[] {o.getClass()});
+ return method.invoke(obj, new Object[] {o});
+ } catch (InvocationTargetException t) {
+ Throwable t2 = t.getTargetException();
+ if (t2 instanceof BuildException) {
+ throw (BuildException) t2;
+ }
+ throw new BuildException(t2);
+ } catch (Throwable t) {
+ throw new BuildException(t);
+ }
+ }
+
+ /**
+ * Call a method with two parameters.
+ * @param methodName the name of the method to call
+ * @param o1 the object to use as the first parameter, this must
+ * be of the same type as the method parameter (not a subclass).
+ * @param o2 the object to use as the second parameter, this must
+ * be of the same type as the method parameter (not a subclass).
+ * @return the object returned by the method
+ */
+ public Object call(String methodName, Object o1, Object o2) {
+ try {
+ Method method;
+ method = obj.getClass().getMethod(
+ methodName, new Class[] {o1.getClass(), o2.getClass()});
+ return method.invoke(obj, new Object[] {o1, o2});
+ } catch (InvocationTargetException t) {
+ Throwable t2 = t.getTargetException();
+ if (t2 instanceof BuildException) {
+ throw (BuildException) t2;
+ }
+ throw new BuildException(t2);
+ } catch (Throwable t) {
+ throw new BuildException(t);
+ }
+ }
+}