Package org.graphstream.stream.file

Source Code of org.graphstream.stream.file.FileSourceParser

/*
* Copyright 2006 - 2013
*     Stefan Balev     <stefan.balev@graphstream-project.org>
*     Julien Baudry    <julien.baudry@graphstream-project.org>
*     Antoine Dutot    <antoine.dutot@graphstream-project.org>
*     Yoann Pigné      <yoann.pigne@graphstream-project.org>
*     Guilhelm Savin   <guilhelm.savin@graphstream-project.org>
*
* This file is part of GraphStream <http://graphstream-project.org>.
*
* GraphStream is a library whose purpose is to handle static or dynamic
* graph, create them from scratch, file or any source and display them.
*
* This program is free software distributed under the terms of two licenses, the
* CeCILL-C license that fits European law, and the GNU Lesser General Public
* License. You can  use, modify and/ or redistribute the software under the terms
* of the CeCILL-C license as circulated by CEA, CNRS and INRIA at the following
* URL <http://www.cecill.info> or under the terms of the GNU LGPL 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program.  If not, see <http://www.gnu.org/licenses/>.
*
* The fact that you are presently reading this means that you have had
* knowledge of the CeCILL-C and LGPL licenses and that you accept their terms.
*/
package org.graphstream.stream.file;

import java.io.FileReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.net.URL;

import org.graphstream.stream.SourceBase;
import org.graphstream.util.parser.ParseException;
import org.graphstream.util.parser.Parser;
import org.graphstream.util.parser.ParserFactory;

/**
* This defines source using a {@link org.graphstream.util.parser.Parser} object
* to parse a stream and generate graph events.
*
*/
public abstract class FileSourceParser extends SourceBase implements FileSource {
  /**
   * Factory used to create parser.
   */
  protected ParserFactory factory;

  /**
   * Parser opened by a call to {@link #begin(Reader)}.
   */
  protected Parser parser;

  /**
   * Get a new parser factory.
   *
   * @return a parser factory
   */
  public abstract ParserFactory getNewParserFactory();

  protected FileSourceParser() {
    factory = getNewParserFactory();
  }

  /*
   * (non-Javadoc)
   *
   * @see org.graphstream.stream.file.FileSource#readAll(java.lang.String)
   */
  public void readAll(String fileName) throws IOException {
    Parser parser = factory.newParser(createReaderForFile(fileName));

    try {
      parser.all();
      parser.close();
    } catch (ParseException e) {
      throw new IOException(e);
    }
  }

  /*
   * (non-Javadoc)
   *
   * @see org.graphstream.stream.file.FileSource#readAll(java.net.URL)
   */
  public void readAll(URL url) throws IOException {
    Parser parser = factory.newParser(new InputStreamReader(url
        .openStream()));

    try {
      parser.all();
      parser.close();
    } catch (ParseException e) {
      throw new IOException(e);
    }
  }

  /*
   * (non-Javadoc)
   *
   * @see org.graphstream.stream.file.FileSource#readAll(java.io.InputStream)
   */
  public void readAll(InputStream stream) throws IOException {
    Parser parser = factory.newParser(new InputStreamReader(stream));

    try {
      parser.all();
      parser.close();
    } catch (ParseException e) {
      throw new IOException(e);
    }
  }

  /*
   * (non-Javadoc)
   *
   * @see org.graphstream.stream.file.FileSource#readAll(java.io.Reader)
   */
  public void readAll(Reader reader) throws IOException {
    Parser parser = factory.newParser(reader);

    try {
      parser.all();
      parser.close();
    } catch (ParseException e) {
      throw new IOException(e);
    }
  }

  /*
   * (non-Javadoc)
   *
   * @see org.graphstream.stream.file.FileSource#begin(java.lang.String)
   */
  public void begin(String fileName) throws IOException {
    if (parser != null)
      end();

    parser = factory.newParser(createReaderForFile(fileName));

    try {
      parser.open();
    } catch (ParseException e) {
      throw new IOException(e);
    }
  }

  /*
   * (non-Javadoc)
   *
   * @see org.graphstream.stream.file.FileSource#begin(java.net.URL)
   */
  public void begin(URL url) throws IOException {
    parser = factory.newParser(new InputStreamReader(url.openStream()));

    try {
      parser.open();
    } catch (ParseException e) {
      throw new IOException(e);
    }
  }

  /*
   * (non-Javadoc)
   *
   * @see org.graphstream.stream.file.FileSource#begin(java.io.InputStream)
   */
  public void begin(InputStream stream) throws IOException {
    parser = factory.newParser(new InputStreamReader(stream));

    try {
      parser.open();
    } catch (ParseException e) {
      throw new IOException(e);
    }
  }

  /*
   * (non-Javadoc)
   *
   * @see org.graphstream.stream.file.FileSource#begin(java.io.Reader)
   */
  public void begin(Reader reader) throws IOException {
    parser = factory.newParser(reader);

    try {
      parser.open();
    } catch (ParseException e) {
      throw new IOException(e);
    }
  }

  /*
   * (non-Javadoc)
   *
   * @see org.graphstream.stream.file.FileSource#nextEvents()
   */
  public boolean nextEvents() throws IOException {
    try {
      return parser.next();
    } catch (ParseException e) {
      throw new IOException(e);
    }
  }

  /**
   * Since there is no step in DOT, this does the same action than
   * {@link #nextEvents()}.
   */
  public boolean nextStep() throws IOException {
    return nextEvents();
  }

  /*
   * (non-Javadoc)
   *
   * @see org.graphstream.stream.file.FileSource#end()
   */
  public void end() throws IOException {
    parser.close();
    parser = null;
  }

  protected Reader createReaderForFile(String filename) throws IOException {
    return new FileReader(filename);
  }
}
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