package org.apache.lucene.ant;

/**
 * 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.
 */

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


public class DocumentHandlerException extends Exception {
    private Throwable cause;

    /**
     * Default constructor.
     */
    public DocumentHandlerException() {
        super();
    }

    /**
     * Constructs with message.
     */
    public DocumentHandlerException(String message) {
        super(message);
    }

    /**
     * Constructs with chained exception.
     */
    public DocumentHandlerException(Throwable cause) {
        super(cause.toString());
        this.cause = cause;
    }

    /**
     * Retrieves nested exception.
     */
    public Throwable getException() {
        return cause;
    }

    @Override
    public void printStackTrace() {
        printStackTrace(System.err);
    }

    @Override
    public void printStackTrace(PrintStream ps) {
        synchronized (ps) {
            super.printStackTrace(ps);
            if (cause != null) {
                ps.println("--- Nested Exception ---");
                cause.printStackTrace(ps);
            }
        }
    }

    @Override
    public void printStackTrace(PrintWriter pw) {
        synchronized (pw) {
            super.printStackTrace(pw);
            if (cause != null) {
                pw.println("--- Nested Exception ---");
                cause.printStackTrace(pw);
            }
        }
    }
}