package org.apache.maven.shared.utils.xml;

/*
 * 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.IOException;
import java.io.InputStream;

/**
 * The XmlReaderException is thrown by the XmlReader constructors if the charset encoding can not be determined
 * according to the XML 1.0 specification and RFC 3023.
 * <p/>
 * The exception returns the unconsumed InputStream to allow the application to do an alternate processing with the
 * stream. Note that the original InputStream given to the XmlReader cannot be used as that one has been already read.
 * <p/>
 *
 * @author Alejandro Abdelnur
 * @version revision 1.1 taken on 26/06/2007 from Rome (see https://rome.dev.java.net/source/browse/rome/src/java/com/sun/syndication/io/XmlReaderException.java)
 */
class XmlReaderException
    extends IOException
{
    /**
     * 
     */
    private static final long serialVersionUID = 5044326391409597950L;

    private final String bomEncoding;

    private final String xmlGuessEncoding;

    private final String xmlEncoding;

    private final String contentTypeMime;

    private final String contentTypeEncoding;

    private final InputStream is;

    /**
     * Creates an exception instance if the charset encoding could not be determined.
     * <p/>
     * Instances of this exception are thrown by the XmlReader.
     * <p/>
     *
     * @param msg         message describing the reason for the exception.
     * @param bomEnc      BOM encoding.
     * @param xmlGuessEnc XML guess encoding.
     * @param xmlEnc      XML prolog encoding.
     * @param is          the unconsumed InputStream.
     */
    XmlReaderException( String msg, String bomEnc, String xmlGuessEnc, String xmlEnc, InputStream is )
    {
        this( msg, null, null, bomEnc, xmlGuessEnc, xmlEnc, is );
    }

    /**
     * Creates an exception instance if the charset encoding could not be determined.
     * <p/>
     * Instances of this exception are thrown by the XmlReader.
     * <p/>
     *
     * @param msg         message describing the reason for the exception.
     * @param ctMime      MIME type in the content-type.
     * @param ctEnc       encoding in the content-type.
     * @param bomEnc      BOM encoding.
     * @param xmlGuessEnc XML guess encoding.
     * @param xmlEnc      XML prolog encoding.
     * @param is          the unconsumed InputStream.
     */
    XmlReaderException( String msg, String ctMime, String ctEnc, String bomEnc, String xmlGuessEnc,
                               String xmlEnc, InputStream is )
    {
        super( msg );
        contentTypeMime = ctMime;
        contentTypeEncoding = ctEnc;
        bomEncoding = bomEnc;
        xmlGuessEncoding = xmlGuessEnc;
        xmlEncoding = xmlEnc;
        this.is = is;
    }

    /**
     * Returns the BOM encoding found in the InputStream.
     * <p/>
     *
     * @return the BOM encoding, null if none.
     */
    public String getBomEncoding()
    {
        return bomEncoding;
    }

    /**
     * Returns the encoding guess based on the first bytes of the InputStream.
     * <p/>
     *
     * @return the encoding guess, null if it couldn't be guessed.
     */
    public String getXmlGuessEncoding()
    {
        return xmlGuessEncoding;
    }

    /**
     * Returns the encoding found in the XML prolog of the InputStream.
     * <p/>
     *
     * @return the encoding of the XML prolog, null if none.
     */
    public String getXmlEncoding()
    {
        return xmlEncoding;
    }

    /**
     * Returns the MIME type in the content-type used to attempt determining the encoding.
     * <p/>
     *
     * @return the MIME type in the content-type, null if there was not content-type or the encoding detection did not
     *         involve HTTP.
     */
    public String getContentTypeMime()
    {
        return contentTypeMime;
    }

    /**
     * Returns the encoding in the content-type used to attempt determining the encoding.
     * <p/>
     *
     * @return the encoding in the content-type, null if there was not content-type, no encoding in it or the encoding
     *         detection did not involve HTTP.
     */
    public String getContentTypeEncoding()
    {
        return contentTypeEncoding;
    }

    /**
     * Returns the unconsumed InputStream to allow the application to do an alternate encoding detection on the
     * InputStream.
     * <p/>
     *
     * @return the unconsumed InputStream.
     */
    public InputStream getInputStream()
    {
        return is;
    }
}