DoublingContentHandlerDecoratorFactory.java

/*
 * 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.sax;

import java.util.Locale;

import org.xml.sax.ContentHandler;
import org.xml.sax.SAXException;

import org.apache.tika.config.TikaComponent;
import org.apache.tika.metadata.Metadata;
import org.apache.tika.parser.ParseContext;

@TikaComponent
public class DoublingContentHandlerDecoratorFactory implements ContentHandlerDecoratorFactory {
    private static final char[] NEWLINE = new char[]{'\n'};

    @Override
    public ContentHandler decorate(ContentHandler contentHandler, Metadata metadata,
                                   ParseContext parseContext) {
        return new ContentHandlerDecorator(contentHandler) {
            @Override
            public void characters(char[] ch, int start, int length) throws SAXException {
                String content = new String(ch, start, length).toUpperCase(Locale.US);
                contentHandler.characters(content.toCharArray(), start, length);
                contentHandler.characters(NEWLINE, 0, 1);
                contentHandler.characters(content.toCharArray(), start, length);
            }
        };
    }
}