/**

 * Alt2XML

 * Copyright © 2014 František Kučera (frantovo.cz)

 *

 * This program is free software: you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation, either version 3 of the License, or

 * (at your option) any later version.

 *

 * This program 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 General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program. If not, see <http://www.gnu.org/licenses/>.

 */

package cz.frantovo.alt2xml.in.fs;

import cz.frantovo.alt2xml.AbstractAlt2XmlReader;

import java.io.File;

import java.io.IOException;

import java.net.URI;

import java.net.URISyntaxException;

import java.util.logging.Logger;

import org.xml.sax.Attributes;

import org.xml.sax.InputSource;

import org.xml.sax.SAXException;

import org.xml.sax.helpers.AttributesImpl;

/**

 * Reads filesystem – hierarchical structure of directories and files.

 *

 * @author Ing. František Kučera (frantovo.cz)

 */

public class Reader extends AbstractAlt2XmlReader {

	public static final String ROOT_ELEMENT = "fs";

	public static final String DIR_ELEMENT = "dir";

	public static final String FILE_ELEMENT = "file";

	public static final String ROOT_ATTRIBUTE = "root";

	public static final String NAME_ATTRIBUTE = "name";

	private static final Logger log = Logger.getLogger(Reader.class.getName());

	@Override

	public void parse(InputSource input) throws IOException, SAXException {

		File dir = getFile(input.getSystemId());

		outputStart(dir);

		outputDir(dir);

		outputEnd();

	}

	private File getFile(String systemId) throws IOException {

		try {

			return new File(new URI(systemId));

		} catch (URISyntaxException e) {

			throw new IOException("Invalid dir URI", e);

		}

	}

	private Attributes singleAttribute(String name, String value) {

		AttributesImpl attributes = new AttributesImpl();

		attributes.addAttribute(null, name, name, "xs:string", value);

		return attributes;

	}

	private void outputStart(File root) throws SAXException {

		contentHandler.startDocument();

		contentHandler.lineBreak();

		contentHandler.startElement(null, null, ROOT_ELEMENT, singleAttribute(ROOT_ATTRIBUTE, root.getAbsolutePath()));

		contentHandler.lineBreak();

	}

	private void outputEnd() throws SAXException {

		contentHandler.endElement(null, null, ROOT_ELEMENT);

		contentHandler.lineBreak();

		contentHandler.endDocument();

	}

	private void outputFile(File file) throws SAXException {

		contentHandler.startElement(null, null, FILE_ELEMENT, singleAttribute(NAME_ATTRIBUTE, file.getName()));

		contentHandler.lineBreak();

		//contentHandler.characters(file.getName());

		contentHandler.endElement(null, null, FILE_ELEMENT);

		contentHandler.lineBreak();

	}

	private void outputDir(File dir) throws SAXException {

		contentHandler.startElement(null, null, DIR_ELEMENT, singleAttribute(NAME_ATTRIBUTE, dir.getName()));

		contentHandler.lineBreak();

		for (File file : dir.listFiles()) {

			if (file.isDirectory()) {

				outputDir(file);

			} else {

				outputFile(file);

			}

		}

		contentHandler.endElement(null, null, DIR_ELEMENT);

		contentHandler.lineBreak();

	}

}