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/** |
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$Id$ |
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Copyright (C) 2006 Nicklas Nordborg |
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This file is part of BASE - BioArray Software Environment. |
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Available at http://base.thep.lu.se/ |
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BASE is free software; you can redistribute it and/or |
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modify it under the terms of the GNU General Public License |
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as published by the Free Software Foundation; either version 3 |
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of the License, or (at your option) any later version. |
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BASE is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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You should have received a copy of the GNU General Public License |
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along with BASE. If not, see <http://www.gnu.org/licenses/>. |
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*/ |
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package net.sf.basedb.util.error; |
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import java.util.ArrayList; |
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import java.util.HashMap; |
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import java.util.List; |
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import java.util.Map; |
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/** |
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Error handler that allows the registration of one or more |
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error handler for subclasses to <code>Throwable</code>. |
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<p> |
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Use the {@link #addErrorHandler(Class, ErrorHandler)} to register |
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error handlers for specific exceptions. When the {@link #handleError(Throwable)} |
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is invoked it checks the class of the throwable and looks for error handlers |
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for that class. If it can't find an error handler it will check the superclass |
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and so on. If no error handler is found the orginal error is re-thrown. |
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@author nicklas |
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@version 2.0 |
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@base.modified $Date$ |
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*/ |
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public class ClassMapErrorHandler |
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implements ErrorHandler |
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{ |
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|
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/** |
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Map of registered error handlers. |
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*/ |
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private Map<Class<? extends Throwable>, List<ErrorHandler>> errorHandlers; |
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private final ErrorHandler defaultErrorHandler; |
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|
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/** |
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Create a new <code>ClassMapErrorHandler</code>. |
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@param defaultErrorHandler The default error handler to use if no |
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other error handler is found, if null the error is re-thrown |
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*/ |
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public ClassMapErrorHandler(ErrorHandler defaultErrorHandler) |
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{ |
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this.defaultErrorHandler = defaultErrorHandler; |
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this.errorHandlers = new HashMap<Class<? extends Throwable>, List<ErrorHandler>>(); |
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} |
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|
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/** |
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Add an error handler for throwable:s of a specific class. The |
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error handler will also handle errors of all subclasses unless |
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a specific error handler exists for that subclass. |
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|
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@param t The class of throwable:s the error handler should handle |
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@param handler The error handler |
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*/ |
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public void addErrorHandler(Class<? extends Throwable> t, ErrorHandler handler) |
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{ |
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List<ErrorHandler> handlers = errorHandlers.get(t); |
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if (handlers == null) |
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{ |
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handlers = new ArrayList<ErrorHandler>(); |
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errorHandlers.put(t, handlers); |
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} |
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handlers.add(0, handler); |
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} |
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|
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/* |
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From the ErrorHandler interface |
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------------------------------------------- |
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*/ |
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@Override |
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public boolean handleError(Throwable t) |
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throws Throwable |
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{ |
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Class<?> c = t.getClass(); |
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List<ErrorHandler> handlers = null; |
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do |
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{ |
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handlers = errorHandlers.get(c); |
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if (handlers != null) |
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{ |
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for (ErrorHandler handler : handlers) |
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{ |
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if (handler.handleError(t)) return true; |
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} |
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handlers = null; |
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} |
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c = c.getSuperclass(); |
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} while (c != null && handlers == null); |
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if (defaultErrorHandler != null && defaultErrorHandler.handleError(t)) return true; |
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throw t; |
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} |
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// ------------------------------------------- |
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|
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} |