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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.tika.parser.txt;

import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.Charset;
import java.util.Collections;
import java.util.Set;

import org.apache.commons.io.input.CloseShieldInputStream;
import org.apache.tika.detect.AutoDetectReader;
import org.apache.tika.detect.EncodingDetector;
import org.apache.tika.exception.TikaException;
import org.apache.tika.metadata.Metadata;
import org.apache.tika.mime.MediaType;
import org.apache.tika.parser.AbstractEncodingDetectorParser;
import org.apache.tika.parser.ParseContext;
import org.apache.tika.sax.XHTMLContentHandler;
import org.xml.sax.ContentHandler;
import org.xml.sax.SAXException;

/**
 * Plain text parser. The text encoding of the document stream is
 * automatically detected based on the byte patterns found at the
 * beginning of the stream and the given document metadata, most
 * notably the charset parameter of a
 * {@link org.apache.tika.metadata.HttpHeaders#CONTENT_TYPE} value.
 * 

* This parser sets the following output metadata entries: *

*
{@link org.apache.tika.metadata.HttpHeaders#CONTENT_TYPE}
*
text/plain; charset=...
*
*/ public class TXTParser extends AbstractEncodingDetectorParser { /** * Serial version UID */ private static final long serialVersionUID = -6656102320836888910L; private static final Set SUPPORTED_TYPES = Collections.singleton(MediaType.TEXT_PLAIN); public Set getSupportedTypes(ParseContext context) { return SUPPORTED_TYPES; } public TXTParser() { super(); } public TXTParser(EncodingDetector encodingDetector) { super(encodingDetector); } public void parse( InputStream stream, ContentHandler handler, Metadata metadata, ParseContext context) throws IOException, SAXException, TikaException { // Automatically detect the character encoding try (AutoDetectReader reader = new AutoDetectReader( new CloseShieldInputStream(stream), metadata, getEncodingDetector(context))) { //try to get detected content type; could be a subclass of text/plain //such as vcal, etc. String incomingMime = metadata.get(Metadata.CONTENT_TYPE); MediaType mediaType = MediaType.TEXT_PLAIN; if (incomingMime != null) { MediaType tmpMediaType = MediaType.parse(incomingMime); if (tmpMediaType != null) { mediaType = tmpMediaType; } } Charset charset = reader.getCharset(); MediaType type = new MediaType(mediaType, charset); metadata.set(Metadata.CONTENT_TYPE, type.toString()); // deprecated, see TIKA-431 metadata.set(Metadata.CONTENT_ENCODING, charset.name()); XHTMLContentHandler xhtml = new XHTMLContentHandler(handler, metadata); xhtml.startDocument(); xhtml.startElement("p"); char[] buffer = new char[4096]; int n = reader.read(buffer); while (n != -1) { xhtml.characters(buffer, 0, n); n = reader.read(buffer); } xhtml.endElement("p"); xhtml.endDocument(); } } }




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