/**
 * Copyright 2007-2016, Kaazing Corporation. All rights reserved.
 *
 * 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.mina.filter.codec;

import org.apache.mina.core.buffer.IoBuffer;

/**
 * An exception that is thrown when {@link ProtocolDecoder}
 * cannot understand or failed to validate the specified {@link IoBuffer}
 * content.
 *
 * @author <a href="http://mina.apache.org">Apache MINA Project</a>
 */
public class ProtocolDecoderException extends ProtocolCodecException {
    private static final long serialVersionUID = 3545799879533408565L;

    private String hexdump;

    /**
     * Constructs a new instance.
     */
    public ProtocolDecoderException() {
        // Do nothing
    }

    /**
     * Constructs a new instance with the specified message.
     */
    public ProtocolDecoderException(String message) {
        super(message);
    }

    /**
     * Constructs a new instance with the specified cause.
     */
    public ProtocolDecoderException(Throwable cause) {
        super(cause);
    }

    /**
     * Constructs a new instance with the specified message and the specified
     * cause.
     */
    public ProtocolDecoderException(String message, Throwable cause) {
        super(message, cause);
    }

    /**
     * Returns the message and the hexdump of the unknown part.
     */
    @Override
    public String getMessage() {
        String message = super.getMessage();

        if (message == null) {
            message = "";
        }

        if (hexdump != null) {
            return message + (message.length() > 0 ? " " : "") + "(Hexdump: "
                    + hexdump + ')';
        }

        return message;
    }

    /**
     * Returns the hexdump of the unknown message part.
     */
    public String getHexdump() {
        return hexdump;
    }

    /**
     * Sets the hexdump of the unknown message part.
     */
    public void setHexdump(String hexdump) {
        if (this.hexdump != null) {
            throw new IllegalStateException(
                    "Hexdump cannot be set more than once.");
        }
        this.hexdump = hexdump;
    }
}