/*

 * Copyright (c) 1996, 2000, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package java.lang;

/**

 * Signals that an unexpected exception has occurred in a static initializer.

 * An <code>ExceptionInInitializerError</code> is thrown to indicate that an

 * exception occurred during evaluation of a static initializer or the

 * initializer for a static variable.

 *

 * <p>As of release 1.4, this exception has been retrofitted to conform to

 * the general purpose exception-chaining mechanism.  The "saved throwable

 * object" that may be provided at construction time and accessed via

 * the {@link #getException()} method is now known as the <i>cause</i>,

 * and may be accessed via the {@link Throwable#getCause()} method, as well

 * as the aforementioned "legacy method."

 *

 * @author  Frank Yellin

 * @since   1.1

 */

public class ExceptionInInitializerError extends LinkageError {

    /**

     * Use serialVersionUID from JDK 1.1.X for interoperability

     */

    private static final long serialVersionUID = 1521711792217232256L;

    /**

     * This field holds the exception if the

     * ExceptionInInitializerError(Throwable thrown) constructor was

     * used to instantiate the object

     *

     * @serial

     *

     */

    private Throwable exception;

    /**

     * Constructs an <code>ExceptionInInitializerError</code> with

     * <code>null</code> as its detail message string and with no saved

     * throwable object.

     * A detail message is a String that describes this particular exception.

     */

    public ExceptionInInitializerError() {

        initCause(null);  // Disallow subsequent initCause

    }

    /**

     * Constructs a new <code>ExceptionInInitializerError</code> class by

     * saving a reference to the <code>Throwable</code> object thrown for

     * later retrieval by the {@link #getException()} method. The detail

     * message string is set to <code>null</code>.

     *

     * @param thrown The exception thrown

     */

    public ExceptionInInitializerError(Throwable thrown) {

        initCause(null);  // Disallow subsequent initCause

        this.exception = thrown;

    }

    /**

     * Constructs an ExceptionInInitializerError with the specified detail

     * message string.  A detail message is a String that describes this

     * particular exception. The detail message string is saved for later

     * retrieval by the {@link Throwable#getMessage()} method. There is no

     * saved throwable object.

     *

     *

     * @param s the detail message

     */

    public ExceptionInInitializerError(String s) {

        super(s);

        initCause(null);  // Disallow subsequent initCause

    }

    /**

     * Returns the exception that occurred during a static initialization that

     * caused this error to be created.

     *

     * <p>This method predates the general-purpose exception chaining facility.

     * The {@link Throwable#getCause()} method is now the preferred means of

     * obtaining this information.

     *

     * @return the saved throwable object of this

     *         <code>ExceptionInInitializerError</code>, or <code>null</code>

     *         if this <code>ExceptionInInitializerError</code> has no saved

     *         throwable object.

     */

    public Throwable getException() {

        return exception;

    }

    /**

     * Returns the cause of this error (the exception that occurred

     * during a static initialization that caused this error to be created).

     *

     * @return  the cause of this error or <code>null</code> if the

     *          cause is nonexistent or unknown.

     * @since   1.4

     */

    public Throwable getCause() {

        return exception;

    }

}