1 /*
2 * Copyright 2006 Thierry Guerin
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16 package org.exolab.castor.xml.wls8;
17
18 import java.lang.reflect.InvocationTargetException;
19 import java.lang.reflect.Method;
20
21 import org.apache.commons.logging.Log;
22 import org.apache.commons.logging.LogFactory;
23
24 public abstract class WeblogicXercesImplementation {
25 private static final Log LOG = LogFactory.getLog(WeblogicXercesImplementation.class);
26
27 /**
28 * Returns a Method object that reflects the specified public member method of the class
29 * or interface represented by <code>aClass</code>.
30 * <br> If either an SecurityException or NoSuchMethodException
31 * is thrown, calls {@link #handleStaticInitException(Exception)}.
32 *
33 * @param aClass The class.
34 * @param methodName The name of the method.
35 * @param parameterTypes The list of parameters.
36 * @return The Method object that matches the specified name and parameterTypes.
37 * @see Class#getMethod(java.lang.String, java.lang.Class[])
38 */
39 protected static Method getMethod(Class aClass, String methodName, Class[] parameterTypes) {
40 Method method = null;
41 try {
42 method = aClass.getMethod(methodName, parameterTypes);
43 }
44 catch (SecurityException e) {
45 handleStaticInitException("Error while trying to get the method "
46 + methodName + " in class " + aClass, e);
47 }
48 catch (NoSuchMethodException e) {
49 handleStaticInitException("Error while trying to get the method "
50 + methodName + " in class " + aClass, e);
51 }
52 return method;
53 }
54
55 /**
56 * Invokes a method. Calls {@link Method#invoke(java.lang.Object, java.lang.Object[])}. If either
57 * an IllegalArgumentException, IllegalAccessException or InvocationTargetException is thrown,
58 * calls {@link #handleMethodInvokeException(Exception)}.
59 *
60 * @param anObject The object instance to invoke the method on.
61 * @param method The method to invoke.
62 * @param params The parameters to pass to the method.
63 * @return If the method completes normally, the value it returns is returned to the caller
64 * of invoke; if the value has a primitive type, it is first appropriately wrapped in an object.
65 * If the underlying method return type is void, the invocation returns null.
66 * @see Method#invoke(java.lang.Object, java.lang.Object[])
67 */
68 protected Object invoke(Object anObject, Method method, Object[] params) {
69 try {
70 return method.invoke(anObject, params);
71 }
72 catch (IllegalArgumentException e) {
73 handleMethodInvokeException(e);
74 }
75 catch (IllegalAccessException e) {
76 handleMethodInvokeException(e);
77 }
78 catch (InvocationTargetException e) {
79 handleMethodInvokeException(e);
80 }
81 // this code is never reached in theory but is necessary because handleMethodInvokeException
82 // throws a RuntimeException (unchecked).
83 return null;
84 }
85
86 // exception handling methods
87 public static void handleStaticInitException(Exception e) {
88 handleStaticInitException("Error while intializing class", e);
89 }
90
91 /**
92 * Throws a Runtime exception with <code>e</code>'s {@link Exception#getMessage() message} as its
93 * detail message. Also logs the exception as an error.
94 * Called if an error occurs during the static initialization of WeblogicXercesSerializer
95 * & OutputFormat (these classes use reflection to get the Weblogic classes & methods).
96 *
97 * @param message The Message that will be inserted before <code>e</code>'s
98 * {@link Exception#getMessage() message} in the RuntimeException's detail message.
99 * @param e The exception that will be "wrapped" in a RuntimeException
100 */
101 public static void handleStaticInitException(String message, Exception e) {
102 LOG.error(message, e);
103 if (e instanceof RuntimeException) // don't wrap the exception
104 throw (RuntimeException) e;
105 throw new RuntimeException(message + ". " + e.getMessage()); // java 1.3, can't wrap using the 1.4 constructor
106 }
107
108 protected static void handleMethodInvokeException(Exception e) {
109 handleMethodInvokeException("Error while trying to invoke a method", e);
110 }
111
112 /**
113 * Throws a Runtime exception with <code>e</code>'s {@link Exception#getMessage() message} as its
114 * detail message. Also logs the exception as an error.
115 *
116 * @param message The Message that will be inserted before <code>e</code>'s
117 * {@link Exception#getMessage() message} in the RuntimeException's detail message.
118 * @param e The exception that will be "wrapped" in a RuntimeException.
119 */
120 protected static void handleMethodInvokeException(String message, Exception e) {
121 LOG.error(message, e);
122 if (e instanceof RuntimeException) // don't wrap the exception
123 throw (RuntimeException) e;
124 throw new RuntimeException(message + ". " + e.getMessage()); // java 1.3, can't wrap using the 1.4 constructor
125 }
126 }