/*******************************************************************************
* Copyright (c) 2000, 2008 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.swt;
import org.eclipse.swt.internal.*;
/**
* This runtime exception is thrown whenever a recoverable error
* occurs internally in SWT. The message text and error code
* provide a further description of the problem. The exception
* has a throwable
field which holds the underlying
* exception that caused the problem (if this information is
* available (i.e. it may be null)).
*
* SWTExceptions are thrown when something fails internally, * but SWT is left in a known stable state (eg. a widget call * was made from a non-u/i thread, or there is failure while * reading an Image because the source file was corrupt). *
* * @see SWTError * @see Sample code and further information */ public class SWTException extends RuntimeException { /** * The SWT error code, one of SWT.ERROR_*. */ public int code; /** * The underlying throwable that caused the problem, * or null if this information is not available. */ public Throwable throwable; static final long serialVersionUID = 3257282552304842547L; /** * Constructs a new instance of this class with its * stack trace filled in. The error code is set to an * unspecified value. */ public SWTException () { this (SWT.ERROR_UNSPECIFIED); } /** * Constructs a new instance of this class with its * stack trace and message filled in. The error code is * set to an unspecified value. Specifyingnull
* as the message is equivalent to specifying an empty string.
*
* @param message the detail message for the exception
*/
public SWTException (String message) {
this (SWT.ERROR_UNSPECIFIED, message);
}
/**
* Constructs a new instance of this class with its
* stack trace and error code filled in.
*
* @param code the SWT error code
*/
public SWTException (int code) {
this (code, SWT.findErrorText (code));
}
/**
* Constructs a new instance of this class with its
* stack trace, error code and message filled in.
* Specifying null
as the message is
* equivalent to specifying an empty string.
*
* @param code the SWT error code
* @param message the detail message for the exception
*/
public SWTException (int code, String message) {
super (message);
this.code = code;
}
/**
* Returns the underlying throwable that caused the problem,
* or null if this information is not available.
* * NOTE: This method overrides Throwable.getCause() that was * added to JDK1.4. It is necessary to override this method * in order for inherited printStackTrace() methods to work. *
* @return the underlying throwable * * @since 3.1 */ public Throwable getCause() { return throwable; } /** * Returns the string describing this SWTException object. ** It is combined with the message string of the Throwable * which caused this SWTException (if this information is available). *
* @return the error message string of this SWTException object */ public String getMessage () { if (throwable == null) return super.getMessage (); return super.getMessage () + " (" + throwable.toString () + ")"; //$NON-NLS-1$ //$NON-NLS-2$ } /** * Outputs a printable representation of this exception's * stack trace on the standard error stream. ** Note: printStackTrace(PrintStream) and printStackTrace(PrintWriter) * are not provided in order to maintain compatibility with CLDC. *
*/ public void printStackTrace () { super.printStackTrace (); if (Library.JAVA_VERSION < Library.JAVA_VERSION(1, 4, 0) && throwable != null) { System.err.println ("*** Stack trace of contained exception ***"); //$NON-NLS-1$ throwable.printStackTrace (); } } }