/*
 * 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.example;

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

import org.apache.tika.exception.TikaException;
import org.apache.tika.language.detect.LanguageHandler;
import org.apache.tika.language.detect.LanguageResult;
import org.apache.tika.metadata.Metadata;
import org.apache.tika.metadata.TikaCoreProperties;
import org.apache.tika.parser.DelegatingParser;
import org.apache.tika.parser.ParseContext;
import org.apache.tika.sax.TeeContentHandler;
import org.xml.sax.ContentHandler;
import org.xml.sax.SAXException;

public class LanguageDetectingParser extends DelegatingParser {
    private static final long serialVersionUID = 4291320409396502774L;

    public void parse(InputStream stream, ContentHandler handler,
                      final Metadata metadata, ParseContext context) throws SAXException,
            IOException, TikaException {
        LanguageHandler langHandler = new LanguageHandler();
        ContentHandler tee = new TeeContentHandler(handler, langHandler);

        super.parse(stream, tee, metadata, context);

        LanguageResult result = langHandler.getLanguage();
        if (result.isReasonablyCertain()) {
            metadata.set(TikaCoreProperties.LANGUAGE, result.getLanguage());
        }
    }
}