Mercurial > projects > dwt-win
view dwt/DWTError.d @ 299:4faf63f6948f
Allow null args
author | Frank Benoit <benoit@tionex.de> |
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date | Sun, 24 Aug 2008 20:57:52 +0200 |
parents | fd9c62a2998e |
children |
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/******************************************************************************* * 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 * Port to the D programming language: * Frank Benoit <benoit@tionex.de> *******************************************************************************/ module dwt.DWTError; import dwt.DWT; import tango.core.Exception; import tango.io.Stdout; import dwt.dwthelper.utils; /** * This error is thrown whenever an unrecoverable error * occurs internally in DWT. The message text and error code * provide a further description of the problem. The exception * has a <code>throwable</code> field which holds the underlying * throwable that caused the problem (if this information is * available (i.e. it may be null)). * <p> * SWTErrors are thrown when something fails internally which * either leaves DWT in an unknown state (eg. the o/s call to * remove an item from a list returns an error code) or when DWT * is left in a known-to-be-unrecoverable state (eg. it runs out * of callback resources). SWTErrors should not occur in typical * programs, although "high reliability" applications should * still catch them. * </p><p> * This class also provides support methods used by DWT to match * error codes to the appropriate exception class (DWTError, * DWTException, or IllegalArgumentException) and to provide * human readable strings for DWT error codes. * </p> * * @see DWTException * @see DWT#error(int) * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a> */ public class DWTError : PlatformException { /** * The DWT error code, one of DWT.ERROR_*. */ public int code; /** * The underlying throwable that caused the problem, * or null if this information is not available. */ public Exception throwable( Exception e ){ this.next = e; return this.next; } public Exception throwable(){ return this.next; } //static final long serialVersionUID = 3833467327105808433L; /** * Constructs a new instance of this class with its * stack trace filled in. The error code is set to an * unspecified value. */ public this () { this (DWT.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. Specifying <code>null</code> * as the message is equivalent to specifying an empty string. * * @param message the detail message for the exception */ public this (String message) { this (DWT.ERROR_UNSPECIFIED, message); } /** * Constructs a new instance of this class with its * stack trace and error code filled in. * * @param code the DWT error code */ public this (int code) { this (code, DWT.findErrorText (code)); } /** * Constructs a new instance of this class with its * stack trace, error code and message filled in. * Specifying <code>null</code> as the message is * equivalent to specifying an empty string. * * @param code the DWT error code * @param message the detail message for the exception */ public this (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. * <p> * 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. * </p> * @return the underlying throwable * * @since 3.1 */ public Exception getCause() { return throwable; } /** * Returns the string describing this DWTError object. * <p> * It is combined with the message string of the Throwable * which caused this DWTError (if this information is available). * </p> * @return the error message string of this DWTError object */ public String getMessage () { if (throwable is null) return super.toString(); return super.toString () ~ " (" ~ throwable.toString () ~ ")"; //$NON-NLS-1$ //$NON-NLS-2$ } /** * Outputs a printable representation of this error's * stack trace on the standard error stream. * <p> * Note: printStackTrace(PrintStream) and printStackTrace(PrintWriter) * are not provided in order to maintain compatibility with CLDC. * </p> */ public void printStackTrace () { Stderr.formatln( "stacktrace follows (if feature compiled in)" ); foreach( msg; info ){ Stderr.formatln( "{}", msg ); } if ( throwable !is null) { Stderr.formatln ("*** Stack trace of contained error ***"); //$NON-NLS-1$ foreach( msg; throwable.info ){ Stderr.formatln( "{}", msg ); } } } }