JDK8/Java8源码在线阅读
/*
* 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
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*/
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.
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