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Commons.Lang, a package of Java utility classes for the classes that are in java.lang's hierarchy, or are considered to be so standard as to justify existence in java.lang.
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/*
 * Copyright 2002-2005 The Apache Software Foundation.
 * 
 * Licensed 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.commons.lang.exception;

import java.io.PrintStream;
import java.io.PrintWriter;

/**
 * The base class of all errors which can contain other exceptions.
 *
 * @author Daniel Rall
 * @see org.apache.commons.lang.exception.NestableException
 * @since 1.0
 * @version $Id: NestableError.java 161243 2005-04-14 04:30:28Z ggregory $
 */
public class NestableError extends Error implements Nestable {

    /**
     * The helper instance which contains much of the code which we
     * delegate to.
     */
    protected NestableDelegate delegate = new NestableDelegate(this);

    /**
     * Holds the reference to the exception or error that caused
     * this exception to be thrown.
     */
    private Throwable cause = null;

    /**
     * Constructs a new NestableError without specified
     * detail message.
     */
    public NestableError() {
        super();
    }

    /**
     * Constructs a new NestableError with specified
     * detail message.
     *
     * @param msg The error message.
     */
    public NestableError(String msg) {
        super(msg);
    }

    /**
     * Constructs a new NestableError with specified
     * nested Throwable.
     *
     * @param cause the exception or error that caused this exception to be
     * thrown
     */
    public NestableError(Throwable cause) {
        super();
        this.cause = cause;
    }

    /**
     * Constructs a new NestableError with specified
     * detail message and nested Throwable.
     *
     * @param msg    the error message
     * @param cause  the exception or error that caused this exception to be
     * thrown
     */
    public NestableError(String msg, Throwable cause) {
        super(msg);
        this.cause = cause;
    }

    public Throwable getCause() {
        return cause;
    }

    /**
     * Returns the detail message string of this throwable. If it was
     * created with a null message, returns the following:
     * (cause==null ? null : cause.toString()).
     *
     * @return String message string of the throwable
     */
    public String getMessage() {
        if (super.getMessage() != null) {
            return super.getMessage();
        } else if (cause != null) {
            return cause.toString();
        } else {
            return null;
        }
    }

    public String getMessage(int index) {
        if (index == 0) {
            return super.getMessage();
        } else {
            return delegate.getMessage(index);
        }
    }

    public String[] getMessages() {
        return delegate.getMessages();
    }

    public Throwable getThrowable(int index) {
        return delegate.getThrowable(index);
    }

    public int getThrowableCount() {
        return delegate.getThrowableCount();
    }

    public Throwable[] getThrowables() {
        return delegate.getThrowables();
    }

    public int indexOfThrowable(Class type) {
        return delegate.indexOfThrowable(type, 0);
    }

    public int indexOfThrowable(Class type, int fromIndex) {
        return delegate.indexOfThrowable(type, fromIndex);
    }

    public void printStackTrace() {
        delegate.printStackTrace();
    }

    public void printStackTrace(PrintStream out) {
        delegate.printStackTrace(out);
    }

    public void printStackTrace(PrintWriter out) {
        delegate.printStackTrace(out);
    }

    public final void printPartialStackTrace(PrintWriter out) {
        super.printStackTrace(out);
    }
}