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* file and include the License file at LICENSE.txt.
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* file that accompanied this code.
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*/
package javax.mail;
import java.lang.*;
/**
* The base class for all exceptions thrown by the Messaging classes
*
* @author John Mani
* @author Bill Shannon
*/
public class
MessagingException extends
Exception {
/**
* The next exception in the chain.
*
* @serial
*/
private
Exception next;
private static final long
serialVersionUID = -7569192289819959253L;
/**
* Constructs a MessagingException with no detail message.
*/
public
MessagingException() {
super();
initCause(null); // prevent anyone else from setting it
}
/**
* Constructs a MessagingException with the specified detail message.
*
* @param s the detail message
*/
public
MessagingException(
String s) {
super(
s);
initCause(null); // prevent anyone else from setting it
}
/**
* Constructs a MessagingException with the specified
* Exception and detail message. The specified exception is chained
* to this exception.
*
* @param s the detail message
* @param e the embedded exception
* @see #getNextException
* @see #setNextException
* @see #getCause
*/
public
MessagingException(
String s,
Exception e) {
super(
s);
next =
e;
initCause(null); // prevent anyone else from setting it
}
/**
* Get the next exception chained to this one. If the
* next exception is a MessagingException, the chain
* may extend further.
*
* @return next Exception, null if none.
*/
public synchronized
Exception getNextException() {
return
next;
}
/**
* Overrides the <code>getCause</code> method of <code>Throwable</code>
* to return the next exception in the chain of nested exceptions.
*
* @return next Exception, null if none.
*/
@
Override
public synchronized
Throwable getCause() {
return
next;
}
/**
* Add an exception to the end of the chain. If the end
* is <strong>not</strong> a MessagingException, this
* exception cannot be added to the end.
*
* @param ex the new end of the Exception chain
* @return <code>true</code> if this Exception
* was added, <code>false</code> otherwise.
*/
public synchronized boolean
setNextException(
Exception ex) {
Exception theEnd = this;
while (
theEnd instanceof
MessagingException &&
((
MessagingException)
theEnd).
next != null) {
theEnd = ((
MessagingException)
theEnd).
next;
}
// If the end is a MessagingException, we can add this
// exception to the chain.
if (
theEnd instanceof
MessagingException) {
((
MessagingException)
theEnd).
next =
ex;
return true;
} else
return false;
}
/**
* Override toString method to provide information on
* nested exceptions.
*/
@
Override
public synchronized
String toString() {
String s = super.toString();
Exception n =
next;
if (
n == null)
return
s;
StringBuilder sb = new
StringBuilder(
s == null ? "" :
s);
while (
n != null) {
sb.
append(";\n nested exception is:\n\t");
if (
n instanceof
MessagingException) {
MessagingException mex = (
MessagingException)
n;
sb.
append(
mex.
superToString());
n =
mex.
next;
} else {
sb.
append(
n.
toString());
n = null;
}
}
return
sb.
toString();
}
/**
* Return the "toString" information for this exception,
* without any information on nested exceptions.
*/
private final
String superToString() {
return super.toString();
}
}