/*
 * SAXParser.java
 * Copyright (C) 2004 The Free Software Foundation
 * 
 * This file is part of GNU JAXP, a library.
 *
 * GNU JAXP 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 2 of the License, or
 * (at your option) any later version.
 * 
 * GNU JAXP 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Linking this library statically or dynamically with other modules is
 * making a combined work based on this library.  Thus, the terms and
 * conditions of the GNU General Public License cover the whole
 * combination.
 *
 * As a special exception, the copyright holders of this library give you
 * permission to link this library with independent modules to produce an
 * executable, regardless of the license terms of these independent
 * modules, and to copy and distribute the resulting executable under
 * terms of your choice, provided that you also meet, for each linked
 * independent module, the terms and conditions of the license of that
 * module.  An independent module is a module which is not derived from
 * or based on this library.  If you modify this library, you may extend
 * this exception to your version of the library, but you are not
 * obliged to do so.  If you do not wish to do so, delete this
 * exception statement from your version. 
 */

package javax.xml.parsers;

import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.io.IOException;
import javax.xml.validation.Schema;
import org.xml.sax.HandlerBase;
import org.xml.sax.InputSource;
import org.xml.sax.Parser;
import org.xml.sax.SAXException;
import org.xml.sax.SAXNotRecognizedException;
import org.xml.sax.SAXNotSupportedException;
import org.xml.sax.XMLReader;
import org.xml.sax.helpers.DefaultHandler;

/**
 * Convenience class for using or accessing a SAX version 1 or 2 parser.
 * Instances of this class are <em>not</em> guaranteed to be thread safe.
 *
 * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>
 */
public abstract class SAXParser
{
  
  protected SAXParser()
  {
  }

  /**
   * Parse the specifed input stream, reporting SAX1 events to the given
   * handler.
   * Prefer the SAX2 version of this method, since the HandlerBase class is
   * now deprecated.
   * Also prefer the version of this method that specifies a system ID, in
   * order to resolve external references correctly.
   * @param is an XML input stream
   * @param hb the SAX1 handler
   * @exception IllegalArgumentException if the input stream is null
   * @see #parse(java.io.InputStream,org.xml.sax.helpers.DefaultHandler)
   */
  public void parse(InputStream is, HandlerBase hb) 
    throws SAXException, IOException
  {
    if (is == null)
      {
        throw new IllegalArgumentException("input stream is null");
      }
    parse(new InputSource(is), hb);
  }

  /**
   * Parse the specified input stream, reporting SAX1 events to the given
   * handler.
   * Prefer the SAX2 version of this method, since the HandlerBase class is
   * now deprecated.
   * @param is an XML input stream
   * @param hb the SAX1 handler
   * @param systemId the system ID of the XML document
   * @exception IllegalArgumentException if the input stream is null
   * @see #parse(java.io.InputStream,org.xml.sax.helpers.DefaultHandler,java.lang.String)
   */
  public void parse(InputStream is, HandlerBase hb, String systemId)
     throws SAXException, IOException
  {
    if (is == null)
      {
        throw new IllegalArgumentException("input stream is null");
      }
    InputSource  source = new InputSource(is);
    source.setSystemId(systemId);
    parse(source, hb);
  }

  /**
   * Parse the specified input stream, reporting SAX2 events to the given
   * handler.
   * Prefer the version of this method that specifies a system ID, in
   * order to resolve external references correctly.
   * @param is an XML input stream
   * @param dh the SAX2 handler
   * @exception IllegalArgumentException if the input stream is null
   */
  public void parse(InputStream is, DefaultHandler dh) 
    throws SAXException, IOException
  {
    if (is == null)
      {
        throw new IllegalArgumentException("input stream is null");
      }
    parse(new InputSource(is), dh);
  }

  /**
   * Parse the specified input stream, reporting SAX2 events to the given
   * handler.
   * @param is an XML input stream
   * @param dh the SAX2 handler
   * @param systemId the system ID of the XML document
   * @exception IllegalArgumentException if the input stream is null
   */
  public void parse (InputStream is, DefaultHandler dh, String systemId)
     throws SAXException, IOException
  {
    if (is == null)
      {
        throw new IllegalArgumentException("input stream is null");
      }
    InputSource  source = new InputSource(is);
    source.setSystemId(systemId);
    parse(source, dh);
  }

  /**
   * Parse the content of the specified URI, reporting SAX1 events to the
   * given handler.
   * Prefer the SAX2 version of this method, since the HandlerBase class is
   * now deprecated.
   * @param uri an XML system ID
   * @param hb the SAX1 handler
   * @exception IllegalArgumentException if the URI is null
   * @see #parse(java.lang.String,org.xml.sax.helpers.DefaultHandler)
   */
  public void parse(String uri, HandlerBase hb) 
    throws SAXException, IOException
  {
    if (uri == null)
      {
        throw new IllegalArgumentException("URI is null");
      }
    parse(new InputSource(uri), hb);
  }

  /**
   * Parse the content of the specified URI, reporting SAX2 events to the
   * given handler.
   * @param uri an XML system ID
   * @param dh the SAX2 handler
   * @exception IllegalArgumentException if the URI is null
   */
  public void parse(String uri, DefaultHandler dh) 
    throws SAXException, IOException
  {
    if (uri == null)
      {
        throw new IllegalArgumentException("URI is null");
      }
    parse(new InputSource(uri), dh);
  }

  /**
   * Parse the content of the specified file, reporting SAX1 events to the
   * given handler.
   * Prefer the SAX2 version of this method, since the HandlerBase class is
   * now deprecated.
   * @param f an XML file
   * @param hb the SAX1 handler
   * @exception IllegalArgumentException if the file is null
   * @see #parse(java.io.File,org.xml.sax.helpers.DefaultHandler)
   */
  public void parse(File f, HandlerBase hb) 
    throws SAXException, IOException
  {
    if (f == null)
      {
        throw new IllegalArgumentException("file is null");
      }
    InputSource source = new InputSource(new FileInputStream(f));
    source.setSystemId(f.toURL().toString());
    parse(source, hb);
  }

  /**
   * Parse the content of the specified file, reporting SAX2 events to the
   * given handler.
   * @param f an XML file
   * @param dh the SAX2 handler
   * @exception IllegalArgumentException if the file is null
   */
  public void parse(File f, DefaultHandler dh) 
    throws SAXException, IOException
  {
    if (f == null)
      {
        throw new IllegalArgumentException("file is null");
      }
    InputSource source = new InputSource(new FileInputStream(f));
    source.setSystemId(f.toURL().toString());
    parse(source, dh);
  }

  /**
   * Parse the specified input source, reporting SAX1 events to the
   * given handler.
   * Prefer the SAX2 version of this method, since the HandlerBase class is
   * now deprecated.
   * @param is the SAX input source
   * @param hb the SAX1 handler
   * @exception IllegalArgumentException if the input source is null
   * @see #parse(org.xml.sax.InputSource,org.xml.sax.helpers.DefaultHandler)
   */
  public void parse(InputSource is, HandlerBase hb) 
    throws SAXException, IOException
  {
    if (is == null)
      {
        throw new IllegalArgumentException("input source is null");
      }
    Parser parser = getParser();
    parser.setDocumentHandler(hb);
    parser.setDTDHandler(hb);
    parser.setEntityResolver(hb);
    parser.setErrorHandler(hb);
    parser.parse(is);
  }

  /**
   * Parse the specified input source, reporting SAX2 events to the
   * given handler.
   * @param f an XML file
   * @param dh the SAX2 handler
   * @exception IllegalArgumentException if the input source is null
   */
  public void parse(InputSource is, DefaultHandler dh) 
    throws SAXException, IOException
  {
    if (is == null)
      {
        throw new IllegalArgumentException("input source is null");
      }
    XMLReader reader = getXMLReader();
    reader.setContentHandler(dh);
    reader.setDTDHandler(dh);
    reader.setEntityResolver(dh);
    reader.setErrorHandler(dh);
    reader.parse(is);
  }

  /**
   * Returns the underlying SAX1 parser.
   */
  public abstract Parser getParser() throws SAXException;

  /**
   * Returns the underlying SAX2 parser.
   * @since 1.1
   */
  public abstract XMLReader getXMLReader() throws SAXException;

  /**
   * Indicates whether this parser is XML Namespace aware.
   */
  public abstract boolean isNamespaceAware();

  /**
   * Indicates whether this parser will validate its input.
   */
  public abstract boolean isValidating();

  /**
   * Sets the specified SAX2 parser property.
   * @param name the name of the property
   * @param value the value of the property
   */
  public abstract void setProperty(String name, Object value) 
    throws SAXNotRecognizedException, SAXNotSupportedException;

  /**
   * Returns the value of the specified SAX2 parser property.
   * @param name the name of the property
   */
  public abstract Object getProperty(String name) 
    throws SAXNotRecognizedException, SAXNotSupportedException;

  // -- JAXP 1.3 methods --

  /**
   * Resets this parser to its original configuration.
   * @since 1.3
   */
  public void reset()
  {
  }

  /**
   * Returns the schema in use by this parser.
   * @since 1.3
   */
  public Schema getSchema()
  {
    return null;
  }

  /**
   * Indicates whether this parser is XInclude-aware.
   * @since 1.3
   */
  public boolean isXIncludeAware()
  {
    return false;
  }
  
}
