Quelle ExceptionUtils.java Sprache: JAVA

/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements.  See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License.  You may obtain a copy of the License at
*
*      http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.jasper.runtime;

import java.lang.reflect.InvocationTargetException;

/**
* Utilities for handling Throwables and Exceptions.
*/
public class ExceptionUtils {

    /**
     * Checks whether the supplied Throwable is one that needs to be
     * rethrown and swallows all others.
     * @param t the Throwable to check
     */
    public static void handleThrowable(Throwable t) {
        if (t instanceof ThreadDeath) {
            throw (ThreadDeath) t;
        }
        if (t instanceof StackOverflowError) {
            // Swallow silently - it should be recoverable
            return;
        }
        if (t instanceof VirtualMachineError) {
            throw (VirtualMachineError) t;
        }
        // All other instances of Throwable will be silently swallowed
    }

    /**
     * Checks whether the supplied Throwable is an instance of
     * <code>InvocationTargetException</code> and returns the throwable that is
     * wrapped by it, if there is any.
     *
     * @param t the Throwable to check
     * @return <code>t</code> or <code>t.getCause()</code>
     */
    public static Throwable unwrapInvocationTargetException(Throwable t) {
        if (t instanceof InvocationTargetException && t.getCause() != null) {
            return t.getCause();
        }
        return t;
    }
}

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