org.etourdot.xincproc.samples.FilterUsageSamples.java Source code

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Here is the source code for org.etourdot.xincproc.samples.FilterUsageSamples.java

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/*
 * This file is part of the XIncProc framework.
 * Copyright (C) 2011 - 2013 Emmanuel Tourdot
 *
 * See the NOTICE file distributed with this work for additional information regarding copyright ownership.
 * This is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser
 * General Public License as published by the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
 * the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License along with this software.
 * If not, see <http://www.gnu.org/licenses/>.
 */

package org.etourdot.xincproc.samples;

import com.google.common.io.Resources;
import org.etourdot.xincproc.xinclude.XIncProcEngine;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.xml.sax.*;
import org.xml.sax.helpers.XMLFilterImpl;
import org.xml.sax.helpers.XMLReaderFactory;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import java.net.URI;
import java.net.URISyntaxException;

public class FilterUsageSamples {
    static final Logger LOG = LoggerFactory.getLogger(FilterUsageSamples.class);

    public static void main(String[] args) throws Exception {
        final FilterUsageSamples filterUsageSamples = new FilterUsageSamples();
        filterUsageSamples.newFilterFromUri();
    }

    /**
     * This is a simple sample where 2 filters are chained
     * <p>The first filter is a {@link org.etourdot.xincproc.xinclude.sax.XIncProcXIncludeFilter} resolving
     * xinclude</p>
     * <p>The second filter extract only 'p' elements</p>
     *
     * @throws Exception
     */
    public void newFilterFromUri() throws Exception {
        final XMLReader xmlReader = XMLReaderFactory.createXMLReader();
        final URI fileUri = Resources.getResource("include.xml").toURI();
        final XMLFilter filter1 = XIncProcEngine.newXIncludeFilter(fileUri);
        xmlReader.setProperty("http://xml.org/sax/properties/lexical-handler", filter1);
        xmlReader.setProperty("http://xml.org/sax/properties/declaration-handler", filter1);
        filter1.setParent(xmlReader);
        final PElementFilter filter = new PElementFilter(filter1);
        final InputSource inputSource = new InputSource(fileUri.toASCIIString());
        filter.parse(inputSource);
        LOG.info(filter.getResult());
    }

    class PElementFilter extends XMLFilterImpl {
        final StringBuilder stringBuilder = new StringBuilder();
        boolean treatChar;

        public PElementFilter(XMLReader reader) {
            super(reader);
            treatChar = false;
        }

        @Override
        public void characters(final char[] ch, final int start, final int length) throws SAXException {
            if (treatChar) {
                stringBuilder.append(new String(ch, start, length));
            }
        }

        @Override
        public void startElement(String uri, String localName, String qName, Attributes attributes)
                throws SAXException {
            LOG.trace("startElement:{}", qName);
            if ("p".equals(qName)) {
                stringBuilder.append("\np:");
                treatChar = true;
                super.startElement(uri, localName, qName, attributes);
            }
        }

        @Override
        public void endElement(String uri, String localName, String qName) throws SAXException {
            if ("p".equals(qName)) {
                stringBuilder.append(":p");
                treatChar = false;
                super.endElement(uri, localName, qName);
            }
        }

        public String getResult() {
            return stringBuilder.toString();
        }
    }
}