javax/print/DocFlavor.java

/* DocFlavor.java --
   Copyright (C) 2004, 2006 Free Software Foundation, Inc.

This file is part of GNU Classpath.

GNU Classpath 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, or (at your option)
any later version.

GNU Classpath is distributed in the hope that it will be useful, but
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
General Public License for more details.

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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA.

Linking this library statically or dynamically with other modules is
making a combined work based on this library.  Thus, the terms and
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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
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terms of your choice, provided that you also meet, for each linked
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package javax.print;

import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.Serializable;
import java.io.StreamTokenizer;
import java.io.StringReader;
import java.nio.charset.Charset;
import java.util.Iterator;
import java.util.Map;
import java.util.TreeMap;

/**
 * <code>DocFlavor</code> provides a description of the format in which the
 * print data will be supplied in a print job to the print service.
 * <p>
 * A doc flavor consists of two parts:
 * <ul>
 * <li>
 * The MIME type (Multipurpose Internet Mail Extensions types as described
 * in RFC 2045/2046) specifying the media format of the print data.
 * </li><li>
 * The representation class name which is the fully qualified name of the
 * class providing the print data to the print job. For example if the print
 * data is supplied as a byte array the representation class name will be
 * <code>"[B"</code> or for an input stream <code>"java.io.InputStream"</code>.
 * </li>
 * </ul>
 * The <code>DocFlavor</code> class is therefore used in several places in the
 * Java Print Service API. A print service provides its supported document
 * flavors as an array of DocFlavor objects and a print job gets the flavor of
 * its data to print from the <code>Doc</code> object provided as a DocFlavor
 * instance.
 * </p>
 * <p>
 * It has to be differentiated between <b>client formatted</b> and <b>service
 * formatted</b> print data. Client formatted print data is already provided
 * formatted by the client e.g. in an image format or as postscript. For
 * service formatted print data, the Java Print Service instance produces
 * the formatted print data. Here the doc flavor's representation class name
 * does specify an interface instead of the actual print data source. The
 * print service will call the methods of the given implementation of this
 * interface with a special Graphics object capable of producing formatted
 * print data from the graphics routines inside the interface methods.
 * </p>
 * <p>
 * <h3>Client formatted print data document flavors</h3>
 * The print service uses the representation class of the doc flavor to know
 * how to retrieve the print data. If the representation class is a
 * <code>URL</code> it will open the URL to read the print data from it. If it is
 * a <code>byte[]</code> it will directly use the array and send it to the
 * printer. There are predefined doc flavor as inner class for the most common
 * representation class types:
 * <ul>
 * <li>Character arrays (<code>char[]</code>): The characters of the array
 * represent the print data.</li>
 * <li>Character streams (<code>java.io.Reader</code>): The whole characters
 * read from the stream represent the print data.</li>
 * <li>String (<code>java.lang.String</code>): The characters of the String
 * represent the print data.</li>
 * <li>Byte arrays (<code>byte[]</code>): The bytes of the array represent the
 * print data. Encoding if text content is given in the mime type.</li>
 * <li>Byte streams (<code>java.io.InputStream</code>): The whole bytes read
 * from the stream represent the print data. If text content the encoding is
 * specified in the mime type.</li>
 * <li>Uniform Resource Locator (<code>java.net.URL</code>): The bytes read
 * from the stream through opening of the URL represent the print data.
 * If text content the encoding is specified in the mime type.</li></li>
 * </ul>
 * </p>
 * <p>
 * <h3>Service formatted print data document flavors</h3>
 * The print service uses the provided object implementing the interface
 * specified by the representation class to produce the formatted print data.
 * The mime type of service formatted data is always
 * <code>"application/x-java-jvm-local-objectref"</code> to signal the local
 * reference to the print data object implementing the interface. Predefined
 * doc flavor classes exist as an inner class for the three available interface
 * to produce print data:
 * <ul>
 * <li>Pageable object (<code>java.awt.print.Pageable</code>): A pageable object
 * is supplied to the print service. The print service will call the methods of
 * the interface with a Grahics object to produce the formatted print data.</li>
 * <li>Printable object (<code>java.awt.print.Printable</code>): A printable object
 * is supplied to the print service. The print service will call the methods of
 * the interface with a Grahics object to produce the formatted print data.</li>
 * <li>Renderable Image object
 * (<code>java.awt.image.renderable.RenderableImage</code>): A renderable image
 * object is supplied to the print service. The print service calls methods of
 * this interface to obtain the image to be printed.</li>
 * </ul>
 * </p>
 *
 * @author Michael Koch (konqueror@gmx.de)
 * @author Wolfgang Baer (WBaer@gmx.de)
 */
public class DocFlavor implements Cloneable, Serializable
{
  /**
   * Predefined static <code>DocFlavor</code> objects for document
   * types which use a byte array for the print data representation.
   * <p>All the defined doc flavors have a print data representation
   * classname of "[B" (byte array).</p>
   *
   * @author Michael Koch (konqueror@gmx.de)
   */
  public static class BYTE_ARRAY
    extends DocFlavor
  {
    private static final long serialVersionUID = -9065578006593857475L;

    /**
     * Byte array doc flavor with a MIME Type of "application/octet-stream".
     */
    public static final BYTE_ARRAY AUTOSENSE = new BYTE_ARRAY("application/octet-stream");
    /**
     * Byte array doc flavor with a MIME Type of "image/gif".
     */
    public static final BYTE_ARRAY GIF = new BYTE_ARRAY("image/gif");
    /**
     * Byte array doc flavor with a MIME Type of "image/jpeg".
     */
    public static final BYTE_ARRAY JPEG = new BYTE_ARRAY("image/jpeg");
    /**
     * Byte array doc flavor with a MIME Type of "application/vnd.hp-PCL".
     */
    public static final BYTE_ARRAY PCL = new BYTE_ARRAY("application/vnd.hp-PCL");
    /**
     * Byte array doc flavor with a MIME Type of "application/pdf".
     */
    public static final BYTE_ARRAY PDF = new BYTE_ARRAY("application/pdf");
    /**
     * Byte array doc flavor with a MIME Type of "image/png".
     */
    public static final BYTE_ARRAY PNG = new BYTE_ARRAY("image/png");
    /**
     * Byte array doc flavor with a MIME Type of "application/postscript".
     */
    public static final BYTE_ARRAY POSTSCRIPT = new BYTE_ARRAY("application/postscript");
    /**
     * Byte array doc flavor with a MIME Type of "text/html" in the host encoding.
     */
    public static final BYTE_ARRAY TEXT_HTML_HOST = new BYTE_ARRAY("text/html; charset=" + hostEncoding);
    /**
     * Byte array doc flavor with a MIME Type of "text/html; charset=us-ascii".
     */
    public static final BYTE_ARRAY TEXT_HTML_US_ASCII = new BYTE_ARRAY("text/html; charset=us-ascii");
    /**
     * Byte array doc flavor with a MIME Type of "text/html; charset=utf-16".
     */
    public static final BYTE_ARRAY TEXT_HTML_UTF_16 = new BYTE_ARRAY("text/html; charset=utf-16");
    /**
     * Byte array doc flavor with a MIME Type of "text/html; charset=utf-16be".
     */
    public static final BYTE_ARRAY TEXT_HTML_UTF_16BE = new BYTE_ARRAY("text/html; charset=utf-16be");
    /**
     * Byte array doc flavor with a MIME Type of "text/html; charset=utf-16le".
     */
    public static final BYTE_ARRAY TEXT_HTML_UTF_16LE = new BYTE_ARRAY("text/html; charset=utf-16le");
    /**
     * Byte array doc flavor with a MIME Type of "text/html; charset=utf-8".
     */
    public static final BYTE_ARRAY TEXT_HTML_UTF_8 = new BYTE_ARRAY("text/html; charset=utf-8");
    /**
     * Byte array doc flavor with a MIME Type of "text/plain" in the host encoding.
     */
    public static final BYTE_ARRAY TEXT_PLAIN_HOST = new BYTE_ARRAY("text/plain; charset=" + hostEncoding);
    /**
     * Byte array doc flavor with a MIME Type of "text/plain; charset=us-ascii".
     */
    public static final BYTE_ARRAY TEXT_PLAIN_US_ASCII = new BYTE_ARRAY("text/plain; charset=us-ascii");
    /**
     * Byte array doc flavor with a MIME Type of "text/plain; charset=utf-16".
     */
    public static final BYTE_ARRAY TEXT_PLAIN_UTF_16 = new BYTE_ARRAY("text/plain; charset=utf-16");
    /**
     * Byte array doc flavor with a MIME Type of "text/plain; charset=utf-16be".
     */
    public static final BYTE_ARRAY TEXT_PLAIN_UTF_16BE = new BYTE_ARRAY("text/plain; charset=utf-16be");
    /**
     * Byte array doc flavor with a MIME Type of "text/plain; charset=utf-16le".
     */
    public static final BYTE_ARRAY TEXT_PLAIN_UTF_16LE = new BYTE_ARRAY("text/plain; charset=utf-16le");
    /**
     * Byte array doc flavor with a MIME Type of "text/plain; charset=utf-8".
     */
    public static final BYTE_ARRAY TEXT_PLAIN_UTF_8 = new BYTE_ARRAY("text/plain; charset=utf-8");

    /**
     * Constructor for doc flavor objects with the given MIME type
     * and a print data representation class name of "[B".
     *
     * @param mimeType the mime type string
     *
     * @throws NullPointerException if mimeType is <code>null</code>.
     * @throws IllegalArgumentException if mimeType has the wrong syntax.
     */
    public BYTE_ARRAY(String mimeType)
    {
      super(mimeType, "[B");
    }
  }

  /**
   * Predefined static <code>DocFlavor</code> objects for document
   * types which use a char array for the print data representation.
   * <p>All the defined doc flavors have a print data representation
   * classname of "[C" (char array).</p>
   *
   * @author Michael Koch (konqueror@gmx.de)
   */
  public static class CHAR_ARRAY
    extends DocFlavor
  {
    private static final long serialVersionUID = -8720590903724405128L;

    /**
     * Char array doc flavor with a MIME Type of "text/html; charset=utf-16".
     */
    public static final DocFlavor.CHAR_ARRAY TEXT_HTML = new CHAR_ARRAY("text/html; charset=utf-16");
    /**
     * Char array doc flavor with a MIME Type of "text/plain; charset=utf-16".
     */
    public static final DocFlavor.CHAR_ARRAY TEXT_PLAIN = new CHAR_ARRAY("text/plain; charset=utf-16");

    /**
     * Constructor for doc flavor objects with the given MIME type
     * and a print data representation class name of "[C".
     *
     * @param mimeType the mime type string
     *
     * @throws NullPointerException if mimeType is <code>null</code>.
     * @throws IllegalArgumentException if mimeType has the wrong syntax.
     */
    public CHAR_ARRAY(String mimeType)
    {
      super(mimeType, "[C");
    }
  }

  /**
   * Predefined static <code>DocFlavor</code> objects for document
   * types which use an InputStream to retrieve the print data.
   * <p>All the defined doc flavors have a print data representation
   * classname of "java.io.InputStream".</p>
   *
   * @author Michael Koch (konqueror@gmx.de)
   */
  public static class INPUT_STREAM
    extends DocFlavor
  {
    private static final long serialVersionUID = -7045842700749194127L;

    /**
     * InputStream doc flavor with a MIME Type of "application/octet-stream".
     */
    public static final INPUT_STREAM AUTOSENSE = new INPUT_STREAM("application/octet-stream");
    /**
     * InputStream doc flavor with a MIME Type of "image/gif".
     */
    public static final INPUT_STREAM GIF = new INPUT_STREAM("image/gif");
    /**
     * InputStream doc flavor with a MIME Type of "image/jpeg".
     */
    public static final INPUT_STREAM JPEG = new INPUT_STREAM("image/jpeg");
    /**
     * InputStream doc flavor with a MIME Type of "application/vnd.hp-PCL".
     */
    public static final INPUT_STREAM PCL = new INPUT_STREAM("application/vnd.hp-PCL");
    /**
     * InputStream doc flavor with a MIME Type of "application/pdf".
     */
    public static final INPUT_STREAM PDF = new INPUT_STREAM("application/pdf");
    /**
     * InputStream doc flavor with a MIME Type of "image/png".
     */
    public static final INPUT_STREAM PNG = new INPUT_STREAM("image/png");
    /**
     * InputStream doc flavor with a MIME Type of "application/postscript".
     */
    public static final INPUT_STREAM POSTSCRIPT = new INPUT_STREAM("application/postscript");
    /**
     * InputStream doc flavor with a MIME Type of "text/html" in the host encoding.
     */
    public static final INPUT_STREAM TEXT_HTML_HOST = new INPUT_STREAM("text/html; charset=" + hostEncoding);
    /**
     * InputStream doc flavor with a MIME Type of "text/html; charset=us-ascii".
     */
    public static final INPUT_STREAM TEXT_HTML_US_ASCII = new INPUT_STREAM("text/html; charset=us-ascii");
    /**
     * InputStream doc flavor with a MIME Type of "text/html; charset=utf-16".
     */
    public static final INPUT_STREAM TEXT_HTML_UTF_16 = new INPUT_STREAM("text/html; charset=utf-16");
    /**
     * InputStream doc flavor with a MIME Type of "text/html; charset=utf-16be".
     */
    public static final INPUT_STREAM TEXT_HTML_UTF_16BE = new INPUT_STREAM("text/html; charset=utf-16be");
    /**
     * InputStream doc flavor with a MIME Type of "text/html; charset=utf-16le".
     */
    public static final INPUT_STREAM TEXT_HTML_UTF_16LE = new INPUT_STREAM("text/html; charset=utf-16le");
    /**
     * InputStream doc flavor with a MIME Type of "text/html; charset=utf-8".
     */
    public static final INPUT_STREAM TEXT_HTML_UTF_8 = new INPUT_STREAM("text/html; charset=utf-8");
    /**
     * InputStream doc flavor with a MIME Type of "text/plain" in the host encoding.
     */
    public static final INPUT_STREAM TEXT_PLAIN_HOST = new INPUT_STREAM("text/plain; charset=" + hostEncoding);
    /**
     * InputStream doc flavor with a MIME Type of "text/plain; charset=us-ascii".
     */
    public static final INPUT_STREAM TEXT_PLAIN_US_ASCII = new INPUT_STREAM("text/plain; charset=us-ascii");
    /**
     * InputStream doc flavor with a MIME Type of "text/plain; charset=utf-16".
     */
    public static final INPUT_STREAM TEXT_PLAIN_UTF_16 = new INPUT_STREAM("text/plain; charset=utf-16");
    /**
     * InputStream doc flavor with a MIME Type of "text/plain; charset=utf-16be".
     */
    public static final INPUT_STREAM TEXT_PLAIN_UTF_16BE = new INPUT_STREAM("text/plain; charset=utf-16be");
    /**
     * InputStream doc flavor with a MIME Type of "text/plain; charset=utf-16le".
     */
    public static final INPUT_STREAM TEXT_PLAIN_UTF_16LE = new INPUT_STREAM("text/plain; charset=utf-16le");
    /**
     * InputStream doc flavor with a MIME Type of "text/plain; charset=utf-8".
     */
    public static final INPUT_STREAM TEXT_PLAIN_UTF_8 = new INPUT_STREAM("text/plain; charset=utf-8");

    /**
     * Constructor for doc flavor objects with the given MIME type
     * and a print data representation class name of "java.io.InputStream".
     *
     * @param mimeType the mime type string
     *
     * @throws NullPointerException if mimeType is <code>null</code>.
     * @throws IllegalArgumentException if mimeType has the wrong syntax.
     */
    public INPUT_STREAM(String mimeType)
    {
      super(mimeType, "java.io.InputStream");
    }
  }

  /**
   * Predefined static <code>DocFlavor</code> objects for document
   * types which use an Reader to retrieve the print data.
   * <p>All the defined doc flavors have a print data representation
   * classname of "java.io.Reader".</p>
   *
   * @author Michael Koch (konqueror@gmx.de)
   */
  public static class READER
    extends DocFlavor
  {
    private static final long serialVersionUID = 7100295812579351567L;

    /**
     * Reader doc flavor with a MIME Type of "text/html; charset=utf-16".
     */
    public static final DocFlavor.READER TEXT_HTML = new READER("text/html; charset=utf-16");
    /**
     * Reader doc flavor with a MIME Type of "text/plain; charset=utf-16".
     */
    public static final DocFlavor.READER TEXT_PLAIN = new READER("text/plain; charset=utf-16");

    /**
     * Constructor for doc flavor objects with the given MIME type
     * and a print data representation class name of "java.io.Reader".
     *
     * @param mimeType the mime type string
     *
     * @throws NullPointerException if mimeType is <code>null</code>.
     * @throws IllegalArgumentException if mimeType has the wrong syntax.
     */
    public READER(String mimeType)
    {
      super(mimeType, "java.io.Reader");
    }
  }

  /**
   * Predefined static <code>DocFlavor</code> objects for document
   * types which use service formatted print data.
   * <p>All the defined doc flavors have a MIME type of
   * "application/x-java-jvm-local-objectref".</p>
   *
   * @author Michael Koch (konqueror@gmx.de)
   */
  public static class SERVICE_FORMATTED
    extends DocFlavor
  {
    private static final long serialVersionUID = 6181337766266637256L;

    /**
     * Service formatted doc flavor with a representation class of
     * "java.awt.print.Pageable".
     */
    public static final DocFlavor.SERVICE_FORMATTED PAGEABLE = new SERVICE_FORMATTED("java.awt.print.Pageable");
    /**
     * Service formatted doc flavor with a representation class of
     * "java.awt.print.Printable".
     */
    public static final DocFlavor.SERVICE_FORMATTED PRINTABLE = new SERVICE_FORMATTED("java.awt.print.Printable");
    /**
     * Service formatted doc flavor with a representation class of
     * "java.awt.image.renderable.RenderableImage".
     */
    public static final DocFlavor.SERVICE_FORMATTED RENDERABLE_IMAGE = new SERVICE_FORMATTED("java.awt.image.renderable.RenderableImage");

    /**
     * Constructor for doc flavor objects with a MIME type of
     * "application/x-java-jvm-local-objectref" and the given
     * print data representation classname.
     *
     * @param className the representation classname
     *
     * @throws NullPointerException if className is <code>null</code>.
     */
    public SERVICE_FORMATTED(String className)
    {
      super("application/x-java-jvm-local-objectref", className);
    }
  }

  /**
   * Predefined static <code>DocFlavor</code> objects for document
   * types which use a String for the print data representation.
   * <p>All the defined doc flavors have a print data representation
   * classname of "java.lang.String".</p>
   *
   * @author Michael Koch (konqueror@gmx.de)
   */
  public static class STRING
    extends DocFlavor
  {
    private static final long serialVersionUID = 4414407504887034035L;

    /**
     * String doc flavor with a MIME Type of "text/html; charset=utf-16".
     */
    public static final DocFlavor.STRING TEXT_HTML = new STRING("text/html; charset=utf-16");
    /**
     * String doc flavor with a MIME Type of "text/plain; charset=utf-16".
     */
    public static final DocFlavor.STRING TEXT_PLAIN = new STRING("text/plain; charset=utf-16");

    /**
     * Constructor for doc flavor objects with the given MIME type
     * and a print data representation class name of "java.lang.String".
     *
     * @param mimeType the mime type string
     *
     * @throws NullPointerException if mimeType is <code>null</code>.
     * @throws IllegalArgumentException if mimeType has the wrong syntax.
     */
    public STRING(String mimeType)
    {
      super(mimeType, "java.lang.String");
    }
  }

  /**
   * Predefined static <code>DocFlavor</code> objects for document
   * types which have an URL where to retrieve the print data.
   * <p>All the defined doc flavors have a print data representation
   * classname of "java.net.URL".</p>
   *
   * @author Michael Koch (konqueror@gmx.de)
   */
  public static class URL
    extends DocFlavor
  {
    private static final long serialVersionUID = 2936725788144902062L;

    /**
     * URL doc flavor with a MIME Type of "application/octet-stream".
     */
    public static final DocFlavor.URL AUTOSENSE = new URL("application/octet-stream");
    /**
     * URL doc flavor with a MIME Type of "image/gif".
     */
    public static final DocFlavor.URL GIF = new URL("image/gif");
    /**
     * URL doc flavor with a MIME Type of "image/jpeg".
     */
    public static final DocFlavor.URL JPEG = new URL("image/jpeg");
    /**
     * URL doc flavor with a MIME Type of "application/vnd.hp-PCL".
     */
    public static final DocFlavor.URL PCL = new URL("application/vnd.hp-PCL");
    /**
     * URL doc flavor with a MIME Type of "application/pdf".
     */
    public static final DocFlavor.URL PDF = new URL("application/pdf");
    /**
     * URL doc flavor with a MIME Type of "image/png".
     */
    public static final DocFlavor.URL PNG = new URL("image/png");
    /**
     * URL doc flavor with a MIME Type of "application/postscript".
     */
    public static final DocFlavor.URL POSTSCRIPT = new URL("application/postscript");
    /**
     * URL doc flavor with a MIME Type of "text/html" in the host encoding.
     */
    public static final DocFlavor.URL TEXT_HTML_HOST = new URL("text/html; charset=" + hostEncoding);
    /**
     * URL doc flavor with a MIME Type of "text/html; charset=us-ascii".
     */
    public static final DocFlavor.URL TEXT_HTML_US_ASCII = new URL("text/html; charset=us-ascii");
    /**
     * URL doc flavor with a MIME Type of "text/html; charset=utf-16".
     */
    public static final DocFlavor.URL TEXT_HTML_UTF_16 = new URL("text/html; charset=utf-16");
    /**
     * URL doc flavor with a MIME Type of "text/html; charset=utf-16be".
     */
    public static final DocFlavor.URL TEXT_HTML_UTF_16BE = new URL("text/html; charset=utf-16be");
    /**
     * URL doc flavor with a MIME Type of "text/html; charset=utf-16le".
     */
    public static final DocFlavor.URL TEXT_HTML_UTF_16LE = new URL("text/html; charset=utf-16le");
    /**
     * URL doc flavor with a MIME Type of "text/html; charset=utf-8".
     */
    public static final DocFlavor.URL TEXT_HTML_UTF_8 = new URL("text/html; charset=utf-8");
    /**
     * URL doc flavor with a MIME Type of "text/plain" in the host encoding.
     */
    public static final DocFlavor.URL TEXT_PLAIN_HOST = new URL("text/plain; charset=" + hostEncoding);
    /**
     * URL doc flavor with a MIME Type of "text/plain; charset=us-ascii".
     */
    public static final DocFlavor.URL TEXT_PLAIN_US_ASCII = new URL("text/plain; charset=us-ascii");
    /**
     * URL doc flavor with a MIME Type of "text/plain; charset=utf-16".
     */
    public static final DocFlavor.URL TEXT_PLAIN_UTF_16 = new URL("text/plain; charset=utf-16");
    /**
     * URL doc flavor with a MIME Type of "text/plain; charset=utf-16be".
     */
    public static final DocFlavor.URL TEXT_PLAIN_UTF_16BE = new URL("text/plain; charset=utf-16be");
    /**
     * URL doc flavor with a MIME Type of "text/plain; charset=utf-16le".
     */
    public static final DocFlavor.URL TEXT_PLAIN_UTF_16LE = new URL("text/plain; charset=utf-16le");
    /**
     * URL doc flavor with a MIME Type of "text/plain; charset=utf-8".
     */
    public static final DocFlavor.URL TEXT_PLAIN_UTF_8 = new URL("text/plain; charset=utf-8");

    /**
     * Constructor for doc flavor objects with the given MIME type
     * and a print data representation class name of "java.net.URL".
     *
     * @param mimeType the mime type string
     *
     * @throws NullPointerException if mimeType is <code>null</code>.
     * @throws IllegalArgumentException if mimeType has the wrong syntax.
     */
    public URL(String mimeType)
    {
      super(mimeType, "java.net.URL");
    }
  }

  private static final long serialVersionUID = -4512080796965449721L;

  /**
   * The string representing the host encoding. This is the encoding
   * used in the predefined HOST doc flavors
   * (e.g. {@link BYTE_ARRAY#TEXT_HTML_HOST}).
   */
  public static final String hostEncoding = Charset.defaultCharset().name();

  private transient String mediaSubtype;
  private transient String mediaType;
  private transient TreeMap params;

  // name as defined in Serialized Form JDK 1.4
  private String myClassName;

  /**
   * Constructs a <code>DocFlavor</code> object with the given MIME type and
   * representation class name.
   *
   * @param mimeType the MIME type string.
   * @param className the fully-qualified name of the representation class.
   *
   * @throws NullPointerException if mimeType or className are <code>null</code>.
   * @throws IllegalArgumentException if given mimeType has syntax errors.
   */
  public DocFlavor(String mimeType, String className)
  {
    if (mimeType == null || className == null)
      throw new NullPointerException();

    params = new TreeMap();
    parseMimeType(mimeType);

    myClassName = className;
  }

  /**
   * Parses the given string as MIME type.
   * The mediatype, mediasubtype and all parameter/value
   * combinations are extracted, comments are dropped.
   *
   * @param mimeType the string to parse
   * @throws IllegalArgumentException if not conformant.
   */
  private void parseMimeType(String mimeType)
  {
    int MEDIA = 1;
    int MEDIASUB = 2;
    int PARAM_NAME = 3;
    int PARAM_VALUE = 4;
    int COMMENT_START = 5;

    int state = 0;
    int lastState = 0; // keeps track of state before comment
    int tok;

    try
      {
        String paramName = null;
        StreamTokenizer in = new StreamTokenizer(new StringReader(mimeType));
        in.resetSyntax();
        // Allowed characters are anything except:
        // SPACE, CTLs (= Unicode characters U+0000 - U+001F and U+007F)
        // and tspecials ( ) < > @ , ; : \ " / [ ] ? =
        in.whitespaceChars(0x00, 0x20);
        in.whitespaceChars(0x7F, 0x7F);
        in.wordChars('A', 'Z');
        in.wordChars('a', 'z');
        in.wordChars('0', '9');
        in.wordChars(0xA0, 0xFF);
        in.wordChars(0x21, 0x21);
        in.wordChars(0x23, 0x27);
        in.wordChars(0x2A, 0x2B);
        in.wordChars(0x2D, 0x2E);
        in.wordChars(0x5E, 0x60);
        in.wordChars(0x7B, 0x7E);
        in.quoteChar('"');

        while ((tok = in.nextToken()) != StreamTokenizer.TT_EOF)
          {
            switch (tok)
              {
              case StreamTokenizer.TT_WORD:
                if (state == 0)
                  {
                    mediaType = in.sval.toLowerCase();
                    state = MEDIA;
                    break;
                  }
                if (state == MEDIA)
                  {
                    mediaSubtype = in.sval.toLowerCase();
                    state = MEDIASUB;
                    break;
                  }
                // begin of parameters is either after mediasub or a parameter value
                if (state == MEDIASUB || state == PARAM_VALUE)
                  {
                    paramName = in.sval.toLowerCase();
                    state = PARAM_NAME;
                    break;
                  }
                // a parameter always needs to follow a value
                if (state == PARAM_NAME)
                  {
                    String paramValue = in.sval;
                    // if a charset param the value needs to be stored lowercase
                    if (paramName.equals("charset"))
                      paramValue = paramValue.toLowerCase();

                    state = PARAM_VALUE;
                    params.put(paramName, paramValue);
                    break;
                  }
                if (state == COMMENT_START)
                  {
                    // ignore;
                    break;
                  }
                break;
              case '/':
                // may only occur after the mediatype
                if (state != MEDIA)
                  throw new IllegalArgumentException();

                break;
              case '=':
                // may only occur after a parameter
                if (state != PARAM_NAME)
                  throw new IllegalArgumentException();

                break;
              case ';':
                // differentiates mime type and parameters/value combinations
                if (state != MEDIASUB && state != PARAM_VALUE)
                  throw new IllegalArgumentException();

                break;
              case '(': // begin comment
                lastState = state;
                state = COMMENT_START;
                break;
              case ')': // end comment
                state = lastState;
                break;
              // a parameter always needs to follow a value / or quoted value
              case '"':
                if (state == PARAM_NAME)
                  {
                    String paramValue = in.sval;
                    // if a charset param the value needs to be stored lowercase
                    if (paramName.equals("charset"))
                      paramValue = paramValue.toLowerCase();

                    state = PARAM_VALUE;
                    params.put(paramName, paramValue);
                    break;
                  }

                // only values may be quoted
                throw new IllegalArgumentException();
              default:
                // if any other char is observed its not allowed
                throw new IllegalArgumentException();
              }
          }
      }
    catch (IOException e)
      {
        // should not happen as mimetype str cannot be null
        throw new InternalError("IOException during parsing String " + mimeType);
      }
  }

  /**
   * Checks if this doc flavor object is equal to the given object.
   * <p>
   * Two doc flavor objects are considered equal if the provided object is not
   * <code>null</code> and an instance of <code>DocFlavor</code>. The MIME
   * types has to be equal in their media type, media subtype, their
   * paramter/value combinations and the representation classname.
   * </p>
   *
   * @param obj the object to test.
   * @return <code>true</code> if equal, <code>false</code> otherwise.
   */
  public boolean equals(Object obj)
  {
    if (! (obj instanceof DocFlavor))
      return false;

    DocFlavor tmp = (DocFlavor) obj;

    return (getMimeType().equals(tmp.getMimeType())
            && getRepresentationClassName().equals(tmp.getRepresentationClassName()));
  }

  /**
   * Returns the media subtype of this flavor object.
   * A mimetype of "text/html; charset=us-ascii" will
   * return "html" as the media subtype.
   *
   * @return The media subtype.
   */
  public String getMediaSubtype()
  {
    return mediaSubtype;
  }

  /**
   * Returns the media type of this flavor object.
   * A mimetype of "text/html; charset=us-ascii" will
   * return "text" as the media type.
   *
   * @return The media type.
   */
  public String getMediaType()
  {
    return mediaType;
  }

  /**
   * Returns the mime type of this flavor object.
   * The mimetype will have every parameter value
   * enclosed in quotes.
   *
   * @return The mime type.
   */
  public String getMimeType()
  {
    String mimeType = getMediaType() + "/" + getMediaSubtype();
    Iterator it = params.entrySet().iterator();

    while (it.hasNext())
      {
        Map.Entry entry = (Map.Entry) it.next();
        mimeType += "; " + entry.getKey() + "=\"" + entry.getValue() + "\"";
      }

    return mimeType;
  }

  /**
   * Returns the value for an optional parameter of the mime type of this
   * flavor object.
   *
   * @param paramName the name of the parameter
   * @return The value for the parameter, or <code>null</code> if none bound.
   * @throws NullPointerException if paramName is <code>null</code>.
   */
  public String getParameter(String paramName)
  {
    if (paramName == null)
      throw new NullPointerException();

    return (String) params.get(paramName.toLowerCase());
  }

  /**
   * Returns the name of the representation class of this flavor object.
   *
   * @return The representation classname.
   */
  public String getRepresentationClassName()
  {
    return myClassName;
  }

  /**
   * Returns a hash code for this doc flavor object.
   *
   * @return The hashcode.
   */
  public int hashCode()
  {
    return ((mediaType.hashCode()
             * mediaSubtype.hashCode()
             * myClassName.hashCode()) ^ params.hashCode());
  }

  /**
   * Returns a string representation of this doc flavor object.
   * The returned string is of the form
   * getMimeType() + "; class=\"" + getRepresentationClassName() + "\"";
   *
   * @return The constructed string representation.
   */
  public String toString()
  {
    return getMimeType() + "; class=\"" + getRepresentationClassName() + "\"";
  }

  // needs special treatment for serialization
  private void readObject(ObjectInputStream stream)
    throws IOException, ClassNotFoundException
  {
    params = new TreeMap();
    myClassName = (String) stream.readObject();
    parseMimeType((String) stream.readObject());
  }

  private void writeObject(java.io.ObjectOutputStream stream)
    throws IOException
  {
    stream.writeObject(myClassName);
    stream.writeObject(getMimeType());
  }
}