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This is the core Apache Tika™ toolkit library from which all other modules inherit functionality. It also includes the core facades for the Tika API.

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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;


import java.io.IOException;
import java.io.InputStream;

import org.apache.tika.exception.TikaException;
import org.apache.tika.metadata.Metadata;
import org.xml.sax.ContentHandler;
import org.xml.sax.SAXException;

public class DigestingParser extends ParserDecorator {

    /**
     * Interface for optional digester, if specified during construction.
     * See org.apache.parser.utils.CommonsDigester in tika-parsers for an
     * implementation.
     */
    public interface Digester {
        /**
         * Digests an InputStream and sets the appropriate value(s) in the metadata.
         * The Digester is also responsible for marking and resetting the stream.
         * 

* The given stream is guaranteed to support the * {@link InputStream#markSupported() mark feature} and the detector * is expected to {@link InputStream#mark(int) mark} the stream before * reading any bytes from it, and to {@link InputStream#reset() reset} * the stream before returning. The stream must not be closed by the * detector. * * @param is InputStream to digest * @param m Metadata to set the values for * @param parseContext ParseContext * @throws IOException */ void digest(InputStream is, Metadata m, ParseContext parseContext) throws IOException; }; private final Digester digester; /** * Creates a decorator for the given parser. * * @param parser the parser instance to be decorated */ public DigestingParser(Parser parser, Digester digester) { super(parser); this.digester = digester; } @Override public void parse(InputStream stream, ContentHandler handler, Metadata metadata, ParseContext context) throws IOException, SAXException, TikaException { if (digester != null) { digester.digest(stream, metadata, context); } super.parse(stream, handler, metadata, context); } }





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