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The Apache Commons IO library contains utility classes, stream implementations, file filters, file comparators, endian transformation classes, and much more.
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/*
 * 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.
 */
package org.apache.commons.io.input;

import java.io.IOException;

/**
 * The XmlStreamReaderException is thrown by the XmlStreamReader constructors if
 * the charset encoding can not be determined according to the XML 1.0
 * specification and RFC 3023.
 * 
 * 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 XmlStreamReader cannot be used as that one has been
 * already read.
 *
 * @since 2.0
 */
public class XmlStreamReaderException extends IOException {

    private static final long serialVersionUID = 1L;

    private final String bomEncoding;

    private final String xmlGuessEncoding;

    private final String xmlEncoding;

    private final String contentTypeMime;

    private final String contentTypeEncoding;

    /**
     * Creates an exception instance if the charset encoding could not be
     * determined.
     * 

     * Instances of this exception are thrown by the XmlStreamReader.
     *
     * @param msg message describing the reason for the exception.
     * @param bomEnc BOM encoding.
     * @param xmlGuessEnc XML guess encoding.
     * @param xmlEnc XML prolog encoding.
     */
    public XmlStreamReaderException(final String msg, final String bomEnc,
            final String xmlGuessEnc, final String xmlEnc) {
        this(msg, null, null, bomEnc, xmlGuessEnc, xmlEnc);
    }

    /**
     * Creates an exception instance if the charset encoding could not be
     * determined.
     * 
     * Instances of this exception are thrown by the XmlStreamReader.
     *
     * @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.
     */
    public XmlStreamReaderException(final String msg, final String ctMime, final String ctEnc,
            final String bomEnc, final String xmlGuessEnc, final String xmlEnc) {
        super(msg);
        contentTypeMime = ctMime;
        contentTypeEncoding = ctEnc;
        bomEncoding = bomEnc;
        xmlGuessEncoding = xmlGuessEnc;
        xmlEncoding = xmlEnc;
    }

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

    /**
     * Returns the encoding guess based on the first bytes of the InputStream.
     *
     * @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.
     *
     * @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.
     *
     * @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.
     *
     * @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;
    }
}