org.apache.commons.lang.exception.NestableException Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of commons-lang Show documentation
Show all versions of commons-lang Show documentation
Commons.Lang, a package of Java utility classes for the
classes that are in java.lang's hierarchy, or are considered to be so
standard as to justify existence in java.lang.
/*
* Copyright 2002-2005 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.lang.exception;
import java.io.PrintStream;
import java.io.PrintWriter;
/**
* The base class of all exceptions which can contain other exceptions.
*
* It is intended to ease the debugging by carrying on the information
* about the exception which was caught and provoked throwing the
* current exception. Catching and rethrowing may occur multiple
* times, and provided that all exceptions except the first one
* are descendants of NestedException, when the
* exception is finally printed out using any of the
* printStackTrace() methods, the stack trace will contain
* the information about all exceptions thrown and caught on
* the way.
* Running the following program
*
* 1 import org.apache.commons.lang.exception.NestableException;
* 2
* 3 public class Test {
* 4 public static void main( String[] args ) {
* 5 try {
* 6 a();
* 7 } catch(Exception e) {
* 8 e.printStackTrace();
* 9 }
* 10 }
* 11
* 12 public static void a() throws Exception {
* 13 try {
* 14 b();
* 15 } catch(Exception e) {
* 16 throw new NestableException("foo", e);
* 17 }
* 18 }
* 19
* 20 public static void b() throws Exception {
* 21 try {
* 22 c();
* 23 } catch(Exception e) {
* 24 throw new NestableException("bar", e);
* 25 }
* 26 }
* 27
* 28 public static void c() throws Exception {
* 29 throw new Exception("baz");
* 30 }
* 31 }
*
* Yields the following stack trace:
*
* org.apache.commons.lang.exception.NestableException: foo
* at Test.a(Test.java:16)
* at Test.main(Test.java:6)
* Caused by: org.apache.commons.lang.exception.NestableException: bar
* at Test.b(Test.java:24)
* at Test.a(Test.java:14)
* ... 1 more
* Caused by: java.lang.Exception: baz
* at Test.c(Test.java:29)
* at Test.b(Test.java:22)
* ... 2 more
*
*
* @author Rafal Krzewski
* @author Daniel Rall
* @author Kasper Nielsen
* @author Steven Caswell
* @since 1.0
* @version $Id: NestableException.java 161243 2005-04-14 04:30:28Z ggregory $
*/
public class NestableException extends Exception implements Nestable {
/**
* The helper instance which contains much of the code which we
* delegate to.
*/
protected NestableDelegate delegate = new NestableDelegate(this);
/**
* Holds the reference to the exception or error that caused
* this exception to be thrown.
*/
private Throwable cause = null;
/**
* Constructs a new NestableException without specified
* detail message.
*/
public NestableException() {
super();
}
/**
* Constructs a new NestableException with specified
* detail message.
*
* @param msg The error message.
*/
public NestableException(String msg) {
super(msg);
}
/**
* Constructs a new NestableException with specified
* nested Throwable.
*
* @param cause the exception or error that caused this exception to be
* thrown
*/
public NestableException(Throwable cause) {
super();
this.cause = cause;
}
/**
* Constructs a new NestableException with specified
* detail message and nested Throwable.
*
* @param msg the error message
* @param cause the exception or error that caused this exception to be
* thrown
*/
public NestableException(String msg, Throwable cause) {
super(msg);
this.cause = cause;
}
public Throwable getCause() {
return cause;
}
/**
* Returns the detail message string of this throwable. If it was
* created with a null message, returns the following:
* (cause==null ? null : cause.toString()).
*
* @return String message string of the throwable
*/
public String getMessage() {
if (super.getMessage() != null) {
return super.getMessage();
} else if (cause != null) {
return cause.toString();
} else {
return null;
}
}
public String getMessage(int index) {
if (index == 0) {
return super.getMessage();
} else {
return delegate.getMessage(index);
}
}
public String[] getMessages() {
return delegate.getMessages();
}
public Throwable getThrowable(int index) {
return delegate.getThrowable(index);
}
public int getThrowableCount() {
return delegate.getThrowableCount();
}
public Throwable[] getThrowables() {
return delegate.getThrowables();
}
public int indexOfThrowable(Class type) {
return delegate.indexOfThrowable(type, 0);
}
public int indexOfThrowable(Class type, int fromIndex) {
return delegate.indexOfThrowable(type, fromIndex);
}
public void printStackTrace() {
delegate.printStackTrace();
}
public void printStackTrace(PrintStream out) {
delegate.printStackTrace(out);
}
public void printStackTrace(PrintWriter out) {
delegate.printStackTrace(out);
}
public final void printPartialStackTrace(PrintWriter out) {
super.printStackTrace(out);
}
}