ojluni/src/main/java/javax/print/MimeType.java - platform/libcore.git - Git at Google

 /*
  * Copyright (c) 2000, 2003, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.  Oracle designates this
  * particular file as subject to the "Classpath" exception as provided
  * by Oracle in the LICENSE file that accompanied this code.
  *
  * This code 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
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  */

 package javax.print;

 import java.io.Serializable;

 import java.util.AbstractMap;
 import java.util.AbstractSet;
 import java.util.Iterator;
 import java.util.Map;
 import java.util.NoSuchElementException;
 import java.util.Set;
 import java.util.Vector;

 /**
  * Class MimeType encapsulates a Multipurpose Internet Mail Extensions (MIME)
  * media type as defined in <A HREF="http://www.ietf.org/rfc/rfc2045.txt">RFC
  * 2045</A> and <A HREF="http://www.ietf.org/rfc/rfc2046.txt">RFC 2046</A>. A
  * MIME type object is part of a {@link DocFlavor DocFlavor} object and
  * specifies the format of the print data.
  * <P>
  * Class MimeType is similar to the like-named
  * class in package {@link java.awt.datatransfer java.awt.datatransfer}. Class
  * java.awt.datatransfer.MimeType is not used in the Jini Print Service API
  * for two reasons:
  * <OL TYPE=1>
  * <LI>
  * Since not all Java profiles include the AWT, the Jini Print Service should
  * not depend on an AWT class.
  * <P>
  * <LI>
  * The implementation of class java.awt.datatransfer.MimeType does not
  * guarantee
  * that equivalent MIME types will have the same serialized representation.
  * Thus, since the Jini Lookup Service (JLUS) matches service attributes based
  * on equality of serialized representations, JLUS searches involving MIME
  * types encapsulated in class java.awt.datatransfer.MimeType may incorrectly
  * fail to match.
  * </OL>
  * <P>
  * Class MimeType's serialized representation is based on the following
  * canonical form of a MIME type string. Thus, two MIME types that are not
  * identical but that are equivalent (that have the same canonical form) will
  * be considered equal by the JLUS's matching algorithm.
  * <UL>
  * <LI> The media type, media subtype, and parameters are retained, but all
  *      comments and whitespace characters are discarded.
  * <LI> The media type, media subtype, and parameter names are converted to
  *      lowercase.
  * <LI> The parameter values retain their original case, except a charset
  *      parameter value for a text media type is converted to lowercase.
  * <LI> Quote characters surrounding parameter values are removed.
  * <LI> Quoting backslash characters inside parameter values are removed.
  * <LI> The parameters are arranged in ascending order of parameter name.
  * </UL>
  * <P>
  *
  * @author  Alan Kaminsky
  */
 class MimeType implements Serializable, Cloneable {

     private static final long serialVersionUID = -2785720609362367683L;

     /**
      * Array of strings that hold pieces of this MIME type's canonical form.
      * If the MIME type has <I>n</I> parameters, <I>n</I> &gt;= 0, then the
      * strings in the array are:
      * <BR>Index 0 -- Media type.
      * <BR>Index 1 -- Media subtype.
      * <BR>Index 2<I>i</I>+2 -- Name of parameter <I>i</I>,
      * <I>i</I>=0,1,...,<I>n</I>-1.
      * <BR>Index 2<I>i</I>+3 -- Value of parameter <I>i</I>,
      * <I>i</I>=0,1,...,<I>n</I>-1.
      * <BR>Parameters are arranged in ascending order of parameter name.
      * @serial
      */
     private String[] myPieces;

     /**
      * String value for this MIME type. Computed when needed and cached.
      */
     private transient String myStringValue = null;

     /**
      * Parameter map entry set. Computed when needed and cached.
      */
     private transient ParameterMapEntrySet myEntrySet = null;

     /**
      * Parameter map. Computed when needed and cached.
      */
     private transient ParameterMap myParameterMap = null;

     /**
      * Parameter map entry.
      */
     private class ParameterMapEntry implements Map.Entry {
         private int myIndex;
         public ParameterMapEntry(int theIndex) {
             myIndex = theIndex;
         }
         public Object getKey(){
             return myPieces[myIndex];
         }
         public Object getValue(){
             return myPieces[myIndex+1];
         }
         public Object setValue (Object value) {
             throw new UnsupportedOperationException();
         }
         public boolean equals(Object o) {
             return (o != null &&
                     o instanceof Map.Entry &&
                     getKey().equals (((Map.Entry) o).getKey()) &&
                     getValue().equals(((Map.Entry) o).getValue()));
         }
         public int hashCode() {
             return getKey().hashCode() ^ getValue().hashCode();
         }
     }

     /**
      * Parameter map entry set iterator.
      */
     private class ParameterMapEntrySetIterator implements Iterator {
         private int myIndex = 2;
         public boolean hasNext() {
             return myIndex < myPieces.length;
         }
         public Object next() {
             if (hasNext()) {
                 ParameterMapEntry result = new ParameterMapEntry (myIndex);
                 myIndex += 2;
                 return result;
             } else {
                 throw new NoSuchElementException();
             }
         }
         public void remove() {
             throw new UnsupportedOperationException();
         }
     }

     /**
      * Parameter map entry set.
      */
     private class ParameterMapEntrySet extends AbstractSet {
         public Iterator iterator() {
             return new ParameterMapEntrySetIterator();
         }
         public int size() {
             return (myPieces.length - 2) / 2;
         }
     }

     /**
      * Parameter map.
      */
     private class ParameterMap extends AbstractMap {
         public Set entrySet() {
             if (myEntrySet == null) {
                 myEntrySet = new ParameterMapEntrySet();
             }
             return myEntrySet;
         }
     }

     /**
      * Construct a new MIME type object from the given string. The given
      * string is converted into canonical form and stored internally.
      *
      * @param  s  MIME media type string.
      *
      * @exception  NullPointerException
      *     (unchecked exception) Thrown if <CODE>s</CODE> is null.
      * @exception  IllegalArgumentException
      *     (unchecked exception) Thrown if <CODE>s</CODE> does not obey the
      *     syntax for a MIME media type string.
      */
     public MimeType(String s) {
         parse (s);
     }

     /**
      * Returns this MIME type object's MIME type string based on the canonical
      * form. Each parameter value is enclosed in quotes.
      */
     public String getMimeType() {
         return getStringValue();
     }

     /**
      * Returns this MIME type object's media type.
      */
     public String getMediaType() {
         return myPieces[0];
     }

     /**
      * Returns this MIME type object's media subtype.
      */
     public String getMediaSubtype() {
         return myPieces[1];
     }

     /**
      * Returns an unmodifiable map view of the parameters in this MIME type
      * object. Each entry in the parameter map view consists of a parameter
      * name String (key) mapping to a parameter value String. If this MIME
      * type object has no parameters, an empty map is returned.
      *
      * @return  Parameter map for this MIME type object.
      */
     public Map getParameterMap() {
         if (myParameterMap == null) {
             myParameterMap = new ParameterMap();
         }
         return myParameterMap;
     }

     /**
      * Converts this MIME type object to a string.
      *
      * @return  MIME type string based on the canonical form. Each parameter
      *          value is enclosed in quotes.
      */
     public String toString() {
         return getStringValue();
     }

     /**
      * Returns a hash code for this MIME type object.
      */
     public int hashCode() {
         return getStringValue().hashCode();
     }

     /**
      * Determine if this MIME type object is equal to the given object. The two
      * are equal if the given object is not null, is an instance of class
      * net.jini.print.data.MimeType, and has the same canonical form as this
      * MIME type object (that is, has the same type, subtype, and parameters).
      * Thus, if two MIME type objects are the same except for comments, they are
      * considered equal. However, "text/plain" and "text/plain;
      * charset=us-ascii" are not considered equal, even though they represent
      * the same media type (because the default character set for plain text is
      * US-ASCII).
      *
      * @param  obj  Object to test.
      *
      * @return  True if this MIME type object equals <CODE>obj</CODE>, false
      *          otherwise.
      */
     public boolean equals (Object obj) {
         return(obj != null &&
                obj instanceof MimeType &&
                getStringValue().equals(((MimeType) obj).getStringValue()));
     }

     /**
      * Returns this MIME type's string value in canonical form.
      */
     private String getStringValue() {
         if (myStringValue == null) {
             StringBuffer result = new StringBuffer();
             result.append (myPieces[0]);
             result.append ('/');
             result.append (myPieces[1]);
             int n = myPieces.length;
             for (int i = 2; i < n; i += 2) {
                 result.append(';');
                 result.append(' ');
                 result.append(myPieces[i]);
                 result.append('=');
                 result.append(addQuotes (myPieces[i+1]));
             }
             myStringValue = result.toString();
         }
         return myStringValue;
     }

 // Hidden classes, constants, and operations for parsing a MIME media type
 // string.

     // Lexeme types.
     private static final int TOKEN_LEXEME         = 0;
     private static final int QUOTED_STRING_LEXEME = 1;
     private static final int TSPECIAL_LEXEME      = 2;
     private static final int EOF_LEXEME           = 3;
     private static final int ILLEGAL_LEXEME       = 4;

     // Class for a lexical analyzer.
     private static class LexicalAnalyzer {
         protected String mySource;
         protected int mySourceLength;
         protected int myCurrentIndex;
         protected int myLexemeType;
         protected int myLexemeBeginIndex;
         protected int myLexemeEndIndex;

         public LexicalAnalyzer(String theSource) {
             mySource = theSource;
             mySourceLength = theSource.length();
             myCurrentIndex = 0;
             nextLexeme();
         }

         public int getLexemeType() {
             return myLexemeType;
         }

         public String getLexeme() {
             return(myLexemeBeginIndex >= mySourceLength ?
                    null :
                    mySource.substring(myLexemeBeginIndex, myLexemeEndIndex));
         }

         public char getLexemeFirstCharacter() {
             return(myLexemeBeginIndex >= mySourceLength ?
                    '\u0000' :
                    mySource.charAt(myLexemeBeginIndex));
         }

         public void nextLexeme() {
             int state = 0;
             int commentLevel = 0;
             char c;
             while (state >= 0) {
                 switch (state) {
                     // Looking for a token, quoted string, or tspecial
                 case 0:
                     if (myCurrentIndex >= mySourceLength) {
                         myLexemeType = EOF_LEXEME;
                         myLexemeBeginIndex = mySourceLength;
                         myLexemeEndIndex = mySourceLength;
                         state = -1;
                     } else if (Character.isWhitespace
                                (c = mySource.charAt (myCurrentIndex ++))) {
                         state = 0;
                     } else if (c == '\"') {
                         myLexemeType = QUOTED_STRING_LEXEME;
                         myLexemeBeginIndex = myCurrentIndex;
                         state = 1;
                     } else if (c == '(') {
                         ++ commentLevel;
                         state = 3;
                     } else if (c == '/'  || c == ';' || c == '=' ||
                                c == ')'  || c == '<' || c == '>' ||
                                c == '@'  || c == ',' || c == ':' ||
                                c == '\\' || c == '[' || c == ']' ||
                                c == '?') {
                         myLexemeType = TSPECIAL_LEXEME;
                         myLexemeBeginIndex = myCurrentIndex - 1;
                         myLexemeEndIndex = myCurrentIndex;
                         state = -1;
                     } else {
                         myLexemeType = TOKEN_LEXEME;
                         myLexemeBeginIndex = myCurrentIndex - 1;
                         state = 5;
                     }
                     break;
                     // In a quoted string
                 case 1:
                     if (myCurrentIndex >= mySourceLength) {
                         myLexemeType = ILLEGAL_LEXEME;
                         myLexemeBeginIndex = mySourceLength;
                         myLexemeEndIndex = mySourceLength;
                         state = -1;
                     } else if ((c = mySource.charAt (myCurrentIndex ++)) == '\"') {
                         myLexemeEndIndex = myCurrentIndex - 1;
                         state = -1;
                     } else if (c == '\\') {
                         state = 2;
                     } else {
                         state = 1;
                     }
                     break;
                     // In a quoted string, backslash seen
                 case 2:
                     if (myCurrentIndex >= mySourceLength) {
                         myLexemeType = ILLEGAL_LEXEME;
                         myLexemeBeginIndex = mySourceLength;
                         myLexemeEndIndex = mySourceLength;
                         state = -1;
                     } else {
                         ++ myCurrentIndex;
                         state = 1;
                     } break;
                     // In a comment
                 case 3: if (myCurrentIndex >= mySourceLength) {
                     myLexemeType = ILLEGAL_LEXEME;
                     myLexemeBeginIndex = mySourceLength;
                     myLexemeEndIndex = mySourceLength;
                     state = -1;
                 } else if ((c = mySource.charAt (myCurrentIndex ++)) == '(') {
                     ++ commentLevel;
                     state = 3;
                 } else if (c == ')') {
                     -- commentLevel;
                     state = commentLevel == 0 ? 0 : 3;
                 } else if (c == '\\') {
                     state = 4;
                 } else { state = 3;
                 }
                 break;
                 // In a comment, backslash seen
                 case 4:
                     if (myCurrentIndex >= mySourceLength) {
                         myLexemeType = ILLEGAL_LEXEME;
                         myLexemeBeginIndex = mySourceLength;
                         myLexemeEndIndex = mySourceLength;
                         state = -1;
                     } else {
                         ++ myCurrentIndex;
                         state = 3;
                     }
                     break;
                     // In a token
                 case 5:
                     if (myCurrentIndex >= mySourceLength) {
                         myLexemeEndIndex = myCurrentIndex;
                         state = -1;
                     } else if (Character.isWhitespace
                                (c = mySource.charAt (myCurrentIndex ++))) {
                         myLexemeEndIndex = myCurrentIndex - 1;
                         state = -1;
                     } else if (c == '\"' || c == '(' || c == '/' ||
                                c == ';'  || c == '=' || c == ')' ||
                                c == '<' || c == '>'  || c == '@' ||
                                c == ',' || c == ':' || c == '\\' ||
                                c == '[' || c == ']' || c == '?') {
                         -- myCurrentIndex;
                         myLexemeEndIndex = myCurrentIndex;
                         state = -1;
                     } else {
                         state = 5;
                     }
                     break;
                 }
             }

         }

     }

     /**
      * Returns a lowercase version of the given string. The lowercase version
      * is constructed by applying Character.toLowerCase() to each character of
      * the given string, which maps characters to lowercase using the rules of
      * Unicode. This mapping is the same regardless of locale, whereas the
      * mapping of String.toLowerCase() may be different depending on the
      * default locale.
      */
     private static String toUnicodeLowerCase(String s) {
         int n = s.length();
         char[] result = new char [n];
         for (int i = 0; i < n; ++ i) {
             result[i] = Character.toLowerCase (s.charAt (i));
         }
         return new String (result);
     }

     /**
      * Returns a version of the given string with backslashes removed.
      */
     private static String removeBackslashes(String s) {
         int n = s.length();
         char[] result = new char [n];
         int i;
         int j = 0;
         char c;
         for (i = 0; i < n; ++ i) {
             c = s.charAt (i);
             if (c == '\\') {
                 c = s.charAt (++ i);
             }
             result[j++] = c;
         }
         return new String (result, 0, j);
     }

     /**
      * Returns a version of the string surrounded by quotes and with interior
      * quotes preceded by a backslash.
      */
     private static String addQuotes(String s) {
         int n = s.length();
         int i;
         char c;
         StringBuffer result = new StringBuffer (n+2);
         result.append ('\"');
         for (i = 0; i < n; ++ i) {
             c = s.charAt (i);
             if (c == '\"') {
                 result.append ('\\');
             }
             result.append (c);
         }
         result.append ('\"');
         return result.toString();
     }

     /**
      * Parses the given string into canonical pieces and stores the pieces in
      * {@link #myPieces <CODE>myPieces</CODE>}.
      * <P>
      * Special rules applied:
      * <UL>
      * <LI> If the media type is text, the value of a charset parameter is
      *      converted to lowercase.
      * </UL>
      *
      * @param  s  MIME media type string.
      *
      * @exception  NullPointerException
      *     (unchecked exception) Thrown if <CODE>s</CODE> is null.
      * @exception  IllegalArgumentException
      *     (unchecked exception) Thrown if <CODE>s</CODE> does not obey the
      *     syntax for a MIME media type string.
      */
     private void parse(String s) {
         // Initialize.
         if (s == null) {
             throw new NullPointerException();
         }
         LexicalAnalyzer theLexer = new LexicalAnalyzer (s);
         int theLexemeType;
         Vector thePieces = new Vector();
         boolean mediaTypeIsText = false;
         boolean parameterNameIsCharset = false;

         // Parse media type.
         if (theLexer.getLexemeType() == TOKEN_LEXEME) {
             String mt = toUnicodeLowerCase (theLexer.getLexeme());
             thePieces.add (mt);
             theLexer.nextLexeme();
             mediaTypeIsText = mt.equals ("text");
         } else {
             throw new IllegalArgumentException();
         }
         // Parse slash.
         if (theLexer.getLexemeType() == TSPECIAL_LEXEME &&
               theLexer.getLexemeFirstCharacter() == '/') {
             theLexer.nextLexeme();
         } else {
             throw new IllegalArgumentException();
         }
         if (theLexer.getLexemeType() == TOKEN_LEXEME) {
             thePieces.add (toUnicodeLowerCase (theLexer.getLexeme()));
             theLexer.nextLexeme();
         } else {
             throw new IllegalArgumentException();
         }
         // Parse zero or more parameters.
         while (theLexer.getLexemeType() == TSPECIAL_LEXEME &&
                theLexer.getLexemeFirstCharacter() == ';') {
             // Parse semicolon.
             theLexer.nextLexeme();

             // Parse parameter name.
             if (theLexer.getLexemeType() == TOKEN_LEXEME) {
                 String pn = toUnicodeLowerCase (theLexer.getLexeme());
                 thePieces.add (pn);
                 theLexer.nextLexeme();
                 parameterNameIsCharset = pn.equals ("charset");
             } else {
                 throw new IllegalArgumentException();
             }

             // Parse equals.
             if (theLexer.getLexemeType() == TSPECIAL_LEXEME &&
                 theLexer.getLexemeFirstCharacter() == '=') {
                 theLexer.nextLexeme();
             } else {
                 throw new IllegalArgumentException();
             }

             // Parse parameter value.
             if (theLexer.getLexemeType() == TOKEN_LEXEME) {
                 String pv = theLexer.getLexeme();
                 thePieces.add(mediaTypeIsText && parameterNameIsCharset ?
                               toUnicodeLowerCase (pv) :
                               pv);
                 theLexer.nextLexeme();
             } else if (theLexer.getLexemeType() == QUOTED_STRING_LEXEME) {
                 String pv = removeBackslashes (theLexer.getLexeme());
                 thePieces.add(mediaTypeIsText && parameterNameIsCharset ?
                               toUnicodeLowerCase (pv) :
                               pv);
                 theLexer.nextLexeme();
             } else {
                 throw new IllegalArgumentException();
             }
         }

         // Make sure we've consumed everything.
         if (theLexer.getLexemeType() != EOF_LEXEME) {
             throw new IllegalArgumentException();
         }

         // Save the pieces. Parameters are not in ascending order yet.
         int n = thePieces.size();
         myPieces = (String[]) thePieces.toArray (new String [n]);

         // Sort the parameters into ascending order using an insertion sort.
         int i, j;
         String temp;
         for (i = 4; i < n; i += 2) {
             j = 2;
             while (j < i && myPieces[j].compareTo (myPieces[i]) <= 0) {
                 j += 2;
             }
             while (j < i) {
                 temp = myPieces[j];
                 myPieces[j] = myPieces[i];
                 myPieces[i] = temp;
                 temp = myPieces[j+1];
                 myPieces[j+1] = myPieces[i+1];
                 myPieces[i+1] = temp;
                 j += 2;
             }
         }
     }
 }
	/*
	* Copyright (c) 2000, 2003, Oracle and/or its affiliates. All rights reserved.
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 only, as
	* published by the Free Software Foundation. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle in the LICENSE file that accompanied this code.
	*
	* This code 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
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/

	package javax.print;

	import java.io.Serializable;

	import java.util.AbstractMap;
	import java.util.AbstractSet;
	import java.util.Iterator;
	import java.util.Map;
	import java.util.NoSuchElementException;
	import java.util.Set;
	import java.util.Vector;

	/**
	* Class MimeType encapsulates a Multipurpose Internet Mail Extensions (MIME)
	* media type as defined in <A HREF="http://www.ietf.org/rfc/rfc2045.txt">RFC
	* 2045</A> and <A HREF="http://www.ietf.org/rfc/rfc2046.txt">RFC 2046</A>. A
	* MIME type object is part of a {@link DocFlavor DocFlavor} object and
	* specifies the format of the print data.
	* <P>
	* Class MimeType is similar to the like-named
	* class in package {@link java.awt.datatransfer java.awt.datatransfer}. Class
	* java.awt.datatransfer.MimeType is not used in the Jini Print Service API
	* for two reasons:
	* <OL TYPE=1>
	* <LI>
	* Since not all Java profiles include the AWT, the Jini Print Service should
	* not depend on an AWT class.
	* <P>
	* <LI>
	* The implementation of class java.awt.datatransfer.MimeType does not
	* guarantee
	* that equivalent MIME types will have the same serialized representation.
	* Thus, since the Jini Lookup Service (JLUS) matches service attributes based
	* on equality of serialized representations, JLUS searches involving MIME
	* types encapsulated in class java.awt.datatransfer.MimeType may incorrectly
	* fail to match.
	* </OL>
	* <P>
	* Class MimeType's serialized representation is based on the following
	* canonical form of a MIME type string. Thus, two MIME types that are not
	* identical but that are equivalent (that have the same canonical form) will
	* be considered equal by the JLUS's matching algorithm.
	* <UL>
	* <LI> The media type, media subtype, and parameters are retained, but all
	* comments and whitespace characters are discarded.
	* <LI> The media type, media subtype, and parameter names are converted to
	* lowercase.
	* <LI> The parameter values retain their original case, except a charset
	* parameter value for a text media type is converted to lowercase.
	* <LI> Quote characters surrounding parameter values are removed.
	* <LI> Quoting backslash characters inside parameter values are removed.
	* <LI> The parameters are arranged in ascending order of parameter name.
	* </UL>
	* <P>
	*
	* @author Alan Kaminsky
	*/
	class MimeType implements Serializable, Cloneable {

	private static final long serialVersionUID = -2785720609362367683L;

	/**
	* Array of strings that hold pieces of this MIME type's canonical form.
	* If the MIME type has <I>n</I> parameters, <I>n</I> >= 0, then the
	* strings in the array are:
	* <BR>Index 0 -- Media type.
	* <BR>Index 1 -- Media subtype.
	* <BR>Index 2<I>i</I>+2 -- Name of parameter <I>i</I>,
	* <I>i</I>=0,1,...,<I>n</I>-1.
	* <BR>Index 2<I>i</I>+3 -- Value of parameter <I>i</I>,
	* <I>i</I>=0,1,...,<I>n</I>-1.
	* <BR>Parameters are arranged in ascending order of parameter name.
	* @serial
	*/
	private String[] myPieces;

	/**
	* String value for this MIME type. Computed when needed and cached.
	*/
	private transient String myStringValue = null;

	/**
	* Parameter map entry set. Computed when needed and cached.
	*/
	private transient ParameterMapEntrySet myEntrySet = null;

	/**
	* Parameter map. Computed when needed and cached.
	*/
	private transient ParameterMap myParameterMap = null;

	/**
	* Parameter map entry.
	*/
	private class ParameterMapEntry implements Map.Entry {
	private int myIndex;
	public ParameterMapEntry(int theIndex) {
	myIndex = theIndex;
	}
	public Object getKey(){
	return myPieces[myIndex];
	}
	public Object getValue(){
	return myPieces[myIndex+1];
	}
	public Object setValue (Object value) {
	throw new UnsupportedOperationException();
	}
	public boolean equals(Object o) {
	return (o != null &&
	o instanceof Map.Entry &&
	getKey().equals (((Map.Entry) o).getKey()) &&
	getValue().equals(((Map.Entry) o).getValue()));
	}
	public int hashCode() {
	return getKey().hashCode() ^ getValue().hashCode();
	}
	}

	/**
	* Parameter map entry set iterator.
	*/
	private class ParameterMapEntrySetIterator implements Iterator {
	private int myIndex = 2;
	public boolean hasNext() {
	return myIndex < myPieces.length;
	}
	public Object next() {
	if (hasNext()) {
	ParameterMapEntry result = new ParameterMapEntry (myIndex);
	myIndex += 2;
	return result;
	} else {
	throw new NoSuchElementException();
	}
	}
	public void remove() {
	throw new UnsupportedOperationException();
	}
	}

	/**
	* Parameter map entry set.
	*/
	private class ParameterMapEntrySet extends AbstractSet {
	public Iterator iterator() {
	return new ParameterMapEntrySetIterator();
	}
	public int size() {
	return (myPieces.length - 2) / 2;
	}
	}

	/**
	* Parameter map.
	*/
	private class ParameterMap extends AbstractMap {
	public Set entrySet() {
	if (myEntrySet == null) {
	myEntrySet = new ParameterMapEntrySet();
	}
	return myEntrySet;
	}
	}

	/**
	* Construct a new MIME type object from the given string. The given
	* string is converted into canonical form and stored internally.
	*
	* @param s MIME media type string.
	*
	* @exception NullPointerException
	* (unchecked exception) Thrown if <CODE>s</CODE> is null.
	* @exception IllegalArgumentException
	* (unchecked exception) Thrown if <CODE>s</CODE> does not obey the
	* syntax for a MIME media type string.
	*/
	public MimeType(String s) {
	parse (s);
	}

	/**
	* Returns this MIME type object's MIME type string based on the canonical
	* form. Each parameter value is enclosed in quotes.
	*/
	public String getMimeType() {
	return getStringValue();
	}

	/**
	* Returns this MIME type object's media type.
	*/
	public String getMediaType() {
	return myPieces[0];
	}

	/**
	* Returns this MIME type object's media subtype.
	*/
	public String getMediaSubtype() {
	return myPieces[1];
	}

	/**
	* Returns an unmodifiable map view of the parameters in this MIME type
	* object. Each entry in the parameter map view consists of a parameter
	* name String (key) mapping to a parameter value String. If this MIME
	* type object has no parameters, an empty map is returned.
	*
	* @return Parameter map for this MIME type object.
	*/
	public Map getParameterMap() {
	if (myParameterMap == null) {
	myParameterMap = new ParameterMap();
	}
	return myParameterMap;
	}

	/**
	* Converts this MIME type object to a string.
	*
	* @return MIME type string based on the canonical form. Each parameter
	* value is enclosed in quotes.
	*/
	public String toString() {
	return getStringValue();
	}

	/**
	* Returns a hash code for this MIME type object.
	*/
	public int hashCode() {
	return getStringValue().hashCode();
	}

	/**
	* Determine if this MIME type object is equal to the given object. The two
	* are equal if the given object is not null, is an instance of class
	* net.jini.print.data.MimeType, and has the same canonical form as this
	* MIME type object (that is, has the same type, subtype, and parameters).
	* Thus, if two MIME type objects are the same except for comments, they are
	* considered equal. However, "text/plain" and "text/plain;
	* charset=us-ascii" are not considered equal, even though they represent
	* the same media type (because the default character set for plain text is
	* US-ASCII).
	*
	* @param obj Object to test.
	*
	* @return True if this MIME type object equals <CODE>obj</CODE>, false
	* otherwise.
	*/
	public boolean equals (Object obj) {
	return(obj != null &&
	obj instanceof MimeType &&
	getStringValue().equals(((MimeType) obj).getStringValue()));
	}

	/**
	* Returns this MIME type's string value in canonical form.
	*/
	private String getStringValue() {
	if (myStringValue == null) {
	StringBuffer result = new StringBuffer();
	result.append (myPieces[0]);
	result.append ('/');
	result.append (myPieces[1]);
	int n = myPieces.length;
	for (int i = 2; i < n; i += 2) {
	result.append(';');
	result.append(' ');
	result.append(myPieces[i]);
	result.append('=');
	result.append(addQuotes (myPieces[i+1]));
	}
	myStringValue = result.toString();
	}
	return myStringValue;
	}

	// Hidden classes, constants, and operations for parsing a MIME media type
	// string.

	// Lexeme types.
	private static final int TOKEN_LEXEME = 0;
	private static final int QUOTED_STRING_LEXEME = 1;
	private static final int TSPECIAL_LEXEME = 2;
	private static final int EOF_LEXEME = 3;
	private static final int ILLEGAL_LEXEME = 4;

	// Class for a lexical analyzer.
	private static class LexicalAnalyzer {
	protected String mySource;
	protected int mySourceLength;
	protected int myCurrentIndex;
	protected int myLexemeType;
	protected int myLexemeBeginIndex;
	protected int myLexemeEndIndex;

	public LexicalAnalyzer(String theSource) {
	mySource = theSource;
	mySourceLength = theSource.length();
	myCurrentIndex = 0;
	nextLexeme();
	}

	public int getLexemeType() {
	return myLexemeType;
	}

	public String getLexeme() {
	return(myLexemeBeginIndex >= mySourceLength ?
	null :
	mySource.substring(myLexemeBeginIndex, myLexemeEndIndex));
	}

	public char getLexemeFirstCharacter() {
	return(myLexemeBeginIndex >= mySourceLength ?
	'\u0000' :
	mySource.charAt(myLexemeBeginIndex));
	}

	public void nextLexeme() {
	int state = 0;
	int commentLevel = 0;
	char c;
	while (state >= 0) {
	switch (state) {
	// Looking for a token, quoted string, or tspecial
	case 0:
	if (myCurrentIndex >= mySourceLength) {
	myLexemeType = EOF_LEXEME;
	myLexemeBeginIndex = mySourceLength;
	myLexemeEndIndex = mySourceLength;
	state = -1;
	} else if (Character.isWhitespace
	(c = mySource.charAt (myCurrentIndex ++))) {
	state = 0;
	} else if (c == '\"') {
	myLexemeType = QUOTED_STRING_LEXEME;
	myLexemeBeginIndex = myCurrentIndex;
	state = 1;
	} else if (c == '(') {
	++ commentLevel;
	state = 3;
	} else if (c == '/' \|\| c == ';' \|\| c == '=' \|\|
	c == ')' \|\| c == '<' \|\| c == '>' \|\|
	c == '@' \|\| c == ',' \|\| c == ':' \|\|
	c == '\\' \|\| c == '[' \|\| c == ']' \|\|
	c == '?') {
	myLexemeType = TSPECIAL_LEXEME;
	myLexemeBeginIndex = myCurrentIndex - 1;
	myLexemeEndIndex = myCurrentIndex;
	state = -1;
	} else {
	myLexemeType = TOKEN_LEXEME;
	myLexemeBeginIndex = myCurrentIndex - 1;
	state = 5;
	}
	break;
	// In a quoted string
	case 1:
	if (myCurrentIndex >= mySourceLength) {
	myLexemeType = ILLEGAL_LEXEME;
	myLexemeBeginIndex = mySourceLength;
	myLexemeEndIndex = mySourceLength;
	state = -1;
	} else if ((c = mySource.charAt (myCurrentIndex ++)) == '\"') {
	myLexemeEndIndex = myCurrentIndex - 1;
	state = -1;
	} else if (c == '\\') {
	state = 2;
	} else {
	state = 1;
	}
	break;
	// In a quoted string, backslash seen
	case 2:
	if (myCurrentIndex >= mySourceLength) {
	myLexemeType = ILLEGAL_LEXEME;
	myLexemeBeginIndex = mySourceLength;
	myLexemeEndIndex = mySourceLength;
	state = -1;
	} else {
	++ myCurrentIndex;
	state = 1;
	} break;
	// In a comment
	case 3: if (myCurrentIndex >= mySourceLength) {
	myLexemeType = ILLEGAL_LEXEME;
	myLexemeBeginIndex = mySourceLength;
	myLexemeEndIndex = mySourceLength;
	state = -1;
	} else if ((c = mySource.charAt (myCurrentIndex ++)) == '(') {
	++ commentLevel;
	state = 3;
	} else if (c == ')') {
	-- commentLevel;
	state = commentLevel == 0 ? 0 : 3;
	} else if (c == '\\') {
	state = 4;
	} else { state = 3;
	}
	break;
	// In a comment, backslash seen
	case 4:
	if (myCurrentIndex >= mySourceLength) {
	myLexemeType = ILLEGAL_LEXEME;
	myLexemeBeginIndex = mySourceLength;
	myLexemeEndIndex = mySourceLength;
	state = -1;
	} else {
	++ myCurrentIndex;
	state = 3;
	}
	break;
	// In a token
	case 5:
	if (myCurrentIndex >= mySourceLength) {
	myLexemeEndIndex = myCurrentIndex;
	state = -1;
	} else if (Character.isWhitespace
	(c = mySource.charAt (myCurrentIndex ++))) {
	myLexemeEndIndex = myCurrentIndex - 1;
	state = -1;
	} else if (c == '\"' \|\| c == '(' \|\| c == '/' \|\|
	c == ';' \|\| c == '=' \|\| c == ')' \|\|
	c == '<' \|\| c == '>' \|\| c == '@' \|\|
	c == ',' \|\| c == ':' \|\| c == '\\' \|\|
	c == '[' \|\| c == ']' \|\| c == '?') {
	-- myCurrentIndex;
	myLexemeEndIndex = myCurrentIndex;
	state = -1;
	} else {
	state = 5;
	}
	break;
	}
	}

	}

	}

	/**
	* Returns a lowercase version of the given string. The lowercase version
	* is constructed by applying Character.toLowerCase() to each character of
	* the given string, which maps characters to lowercase using the rules of
	* Unicode. This mapping is the same regardless of locale, whereas the
	* mapping of String.toLowerCase() may be different depending on the
	* default locale.
	*/
	private static String toUnicodeLowerCase(String s) {
	int n = s.length();
	char[] result = new char [n];
	for (int i = 0; i < n; ++ i) {
	result[i] = Character.toLowerCase (s.charAt (i));
	}
	return new String (result);
	}

	/**
	* Returns a version of the given string with backslashes removed.
	*/
	private static String removeBackslashes(String s) {
	int n = s.length();
	char[] result = new char [n];
	int i;
	int j = 0;
	char c;
	for (i = 0; i < n; ++ i) {
	c = s.charAt (i);
	if (c == '\\') {
	c = s.charAt (++ i);
	}
	result[j++] = c;
	}
	return new String (result, 0, j);
	}

	/**
	* Returns a version of the string surrounded by quotes and with interior
	* quotes preceded by a backslash.
	*/
	private static String addQuotes(String s) {
	int n = s.length();
	int i;
	char c;
	StringBuffer result = new StringBuffer (n+2);
	result.append ('\"');
	for (i = 0; i < n; ++ i) {
	c = s.charAt (i);
	if (c == '\"') {
	result.append ('\\');
	}
	result.append (c);
	}
	result.append ('\"');
	return result.toString();
	}

	/**
	* Parses the given string into canonical pieces and stores the pieces in
	* {@link #myPieces <CODE>myPieces</CODE>}.
	* <P>
	* Special rules applied:
	* <UL>
	* <LI> If the media type is text, the value of a charset parameter is
	* converted to lowercase.
	* </UL>
	*
	* @param s MIME media type string.
	*
	* @exception NullPointerException
	* (unchecked exception) Thrown if <CODE>s</CODE> is null.
	* @exception IllegalArgumentException
	* (unchecked exception) Thrown if <CODE>s</CODE> does not obey the
	* syntax for a MIME media type string.
	*/
	private void parse(String s) {
	// Initialize.
	if (s == null) {
	throw new NullPointerException();
	}
	LexicalAnalyzer theLexer = new LexicalAnalyzer (s);
	int theLexemeType;
	Vector thePieces = new Vector();
	boolean mediaTypeIsText = false;
	boolean parameterNameIsCharset = false;

	// Parse media type.
	if (theLexer.getLexemeType() == TOKEN_LEXEME) {
	String mt = toUnicodeLowerCase (theLexer.getLexeme());
	thePieces.add (mt);
	theLexer.nextLexeme();
	mediaTypeIsText = mt.equals ("text");
	} else {
	throw new IllegalArgumentException();
	}
	// Parse slash.
	if (theLexer.getLexemeType() == TSPECIAL_LEXEME &&
	theLexer.getLexemeFirstCharacter() == '/') {
	theLexer.nextLexeme();
	} else {
	throw new IllegalArgumentException();
	}
	if (theLexer.getLexemeType() == TOKEN_LEXEME) {
	thePieces.add (toUnicodeLowerCase (theLexer.getLexeme()));
	theLexer.nextLexeme();
	} else {
	throw new IllegalArgumentException();
	}
	// Parse zero or more parameters.
	while (theLexer.getLexemeType() == TSPECIAL_LEXEME &&
	theLexer.getLexemeFirstCharacter() == ';') {
	// Parse semicolon.
	theLexer.nextLexeme();

	// Parse parameter name.
	if (theLexer.getLexemeType() == TOKEN_LEXEME) {
	String pn = toUnicodeLowerCase (theLexer.getLexeme());
	thePieces.add (pn);
	theLexer.nextLexeme();
	parameterNameIsCharset = pn.equals ("charset");
	} else {
	throw new IllegalArgumentException();
	}

	// Parse equals.
	if (theLexer.getLexemeType() == TSPECIAL_LEXEME &&
	theLexer.getLexemeFirstCharacter() == '=') {
	theLexer.nextLexeme();
	} else {
	throw new IllegalArgumentException();
	}

	// Parse parameter value.
	if (theLexer.getLexemeType() == TOKEN_LEXEME) {
	String pv = theLexer.getLexeme();
	thePieces.add(mediaTypeIsText && parameterNameIsCharset ?
	toUnicodeLowerCase (pv) :
	pv);
	theLexer.nextLexeme();
	} else if (theLexer.getLexemeType() == QUOTED_STRING_LEXEME) {
	String pv = removeBackslashes (theLexer.getLexeme());
	thePieces.add(mediaTypeIsText && parameterNameIsCharset ?
	toUnicodeLowerCase (pv) :
	pv);
	theLexer.nextLexeme();
	} else {
	throw new IllegalArgumentException();
	}
	}

	// Make sure we've consumed everything.
	if (theLexer.getLexemeType() != EOF_LEXEME) {
	throw new IllegalArgumentException();
	}

	// Save the pieces. Parameters are not in ascending order yet.
	int n = thePieces.size();
	myPieces = (String[]) thePieces.toArray (new String [n]);

	// Sort the parameters into ascending order using an insertion sort.
	int i, j;
	String temp;
	for (i = 4; i < n; i += 2) {
	j = 2;
	while (j < i && myPieces[j].compareTo (myPieces[i]) <= 0) {
	j += 2;
	}
	while (j < i) {
	temp = myPieces[j];
	myPieces[j] = myPieces[i];
	myPieces[i] = temp;
	temp = myPieces[j+1];
	myPieces[j+1] = myPieces[i+1];
	myPieces[i+1] = temp;
	j += 2;
	}
	}
	}
	}