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/*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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*
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* Copyright 2011 OpenConcerto, by ILM Informatique. All rights reserved.
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*
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* The contents of this file are subject to the terms of the GNU General Public License Version 3
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* only ("GPL"). You may not use this file except in compliance with the License. You can obtain a
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* copy of the License at http://www.gnu.org/licenses/gpl-3.0.html See the License for the specific
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* language governing permissions and limitations under the License.
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*
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* When distributing the software, include this License Header Notice in each file.
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*/
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package org.openconcerto.utils;
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import java.io.PrintWriter;
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import java.io.StringWriter;
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import java.lang.reflect.Constructor;
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/**
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* Utilitaires pour les exceptions.
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*
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* @author Sylvain CUAZ 25 nov. 2004
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*/
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public class ExceptionUtils {
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/** Static only. */
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private ExceptionUtils() {
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super();
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}
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/**
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* Crée une exception avec message et cause.
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*
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* @param <T> le type d'exception à créer.
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* @param exnClass la classe de l'exception à créer, eg IOException.class.
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* @param msg le message.
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* @param cause la cause.
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* @return une exception initialisée.
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*/
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static public <T extends Exception> T createExn(Class<T> exnClass, String msg, Throwable cause) {
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T instance = null;
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try {
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Constructor<T> ctor = exnClass.getConstructor(new Class[] { String.class });
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instance = ctor.newInstance(new Object[] { msg });
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} catch (Exception exn) {
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throw new IllegalArgumentException(exnClass + " has no working String constructor");
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}
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instance.initCause(cause);
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return instance;
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}
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/*
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* return an exception so that the caller can "throw ExceptionUtils.throwExn(exn,
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* SQLException.class, RuntimeException.class);" otherwise the compiler will complain that the
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* method doesn't return. Obviously the return will never be used.
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*/
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static public <T extends Throwable, X extends T, Y extends T> X throwExn(T toThrow, Class<X> classX, Class<Y> classY) throws X, Y {
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if (classX.isInstance(toThrow))
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throw classX.cast(toThrow);
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else
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throw classY.cast(toThrow);
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}
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/**
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* Crée une RuntimeException.
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*
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* @param <T> le type d'exception à créer.
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* @param exnClass la classe de l'exception à créer, eg IllegalArgumentException.class.
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* @param msg le message.
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* @param cause la cause.
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* @return une RuntimeException initialisée.
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* @throws IllegalArgumentException if exnClass is not Runtime.
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* @see #createExn(Class, String, Throwable)
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* @deprecated use {@link #createExn(Class, String, Throwable)}
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*/
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static public <T extends RuntimeException> T createRTExn(Class<T> exnClass, String msg, Throwable cause) {
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if (!RuntimeException.class.isAssignableFrom(exnClass))
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throw new IllegalArgumentException(exnClass + " is not a Runtime exception");
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return createExn(exnClass, msg, cause);
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}
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static public String getStackTrace(Throwable cause) {
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final StringWriter res = new StringWriter(128);
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final PrintWriter pw = new PrintWriter(res);
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try {
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cause.printStackTrace(pw);
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} finally {
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pw.close();
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}
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if (pw.checkError())
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Log.get().warning("Error while writing " + cause);
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return res.toString();
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}
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}
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