Java example source code file (MailcapFile.java)
The MailcapFile.java Java example source code
/*
* Copyright (c) 1997, 2005, 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 com.sun.activation.registries;
import java.io.*;
import java.util.*;
public class MailcapFile {
/**
* A Map indexed by MIME type (string) that references
* a Map of commands for each type. The comand Map
* is indexed by the command name and references a List of
* class names (strings) for each command.
*/
private Map type_hash = new HashMap();
/**
* Another Map like above, but for fallback entries.
*/
private Map fallback_hash = new HashMap();
/**
* A Map indexed by MIME type (string) that references
* a List of native commands (string) corresponding to the type.
*/
private Map native_commands = new HashMap();
private static boolean addReverse = false;
static {
try {
addReverse = Boolean.getBoolean("javax.activation.addreverse");
} catch (Throwable t) {
// ignore any errors
}
}
/**
* The constructor that takes a filename as an argument.
*
* @param new_fname The file name of the mailcap file.
*/
public MailcapFile(String new_fname) throws IOException {
if (LogSupport.isLoggable())
LogSupport.log("new MailcapFile: file " + new_fname);
FileReader reader = null;
try {
reader = new FileReader(new_fname);
parse(new BufferedReader(reader));
} finally {
if (reader != null) {
try {
reader.close();
} catch (IOException ex) { }
}
}
}
/**
* The constructor that takes an input stream as an argument.
*
* @param is the input stream
*/
public MailcapFile(InputStream is) throws IOException {
if (LogSupport.isLoggable())
LogSupport.log("new MailcapFile: InputStream");
parse(new BufferedReader(new InputStreamReader(is, "iso-8859-1")));
}
/**
* Mailcap file default constructor.
*/
public MailcapFile() {
if (LogSupport.isLoggable())
LogSupport.log("new MailcapFile: default");
}
/**
* Get the Map of MailcapEntries based on the MIME type.
*
* <p>
* <strong>Semantics: First check for the literal mime type,
* if that fails looks for wildcard <type>/\* and return that. Return the
* list of all that hit.
*/
public Map getMailcapList(String mime_type) {
Map search_result = null;
Map wildcard_result = null;
// first try the literal
search_result = (Map)type_hash.get(mime_type);
// ok, now try the wildcard
int separator = mime_type.indexOf('/');
String subtype = mime_type.substring(separator + 1);
if (!subtype.equals("*")) {
String type = mime_type.substring(0, separator + 1) + "*";
wildcard_result = (Map)type_hash.get(type);
if (wildcard_result != null) { // damn, we have to merge!!!
if (search_result != null)
search_result =
mergeResults(search_result, wildcard_result);
else
search_result = wildcard_result;
}
}
return search_result;
}
/**
* Get the Map of fallback MailcapEntries based on the MIME type.
*
* <p>
* <strong>Semantics: First check for the literal mime type,
* if that fails looks for wildcard <type>/\* and return that. Return the
* list of all that hit.
*/
public Map getMailcapFallbackList(String mime_type) {
Map search_result = null;
Map wildcard_result = null;
// first try the literal
search_result = (Map)fallback_hash.get(mime_type);
// ok, now try the wildcard
int separator = mime_type.indexOf('/');
String subtype = mime_type.substring(separator + 1);
if (!subtype.equals("*")) {
String type = mime_type.substring(0, separator + 1) + "*";
wildcard_result = (Map)fallback_hash.get(type);
if (wildcard_result != null) { // damn, we have to merge!!!
if (search_result != null)
search_result =
mergeResults(search_result, wildcard_result);
else
search_result = wildcard_result;
}
}
return search_result;
}
/**
* Return all the MIME types known to this mailcap file.
*/
public String[] getMimeTypes() {
Set types = new HashSet(type_hash.keySet());
types.addAll(fallback_hash.keySet());
types.addAll(native_commands.keySet());
String[] mts = new String[types.size()];
mts = (String[])types.toArray(mts);
return mts;
}
/**
* Return all the native comands for the given MIME type.
*/
public String[] getNativeCommands(String mime_type) {
String[] cmds = null;
List v =
(List)native_commands.get(mime_type.toLowerCase(Locale.ENGLISH));
if (v != null) {
cmds = new String[v.size()];
cmds = (String[])v.toArray(cmds);
}
return cmds;
}
/**
* Merge the first hash into the second.
* This merge will only effect the hashtable that is
* returned, we don't want to touch the one passed in since
* its integrity must be maintained.
*/
private Map mergeResults(Map first, Map second) {
Iterator verb_enum = second.keySet().iterator();
Map clonedHash = new HashMap(first);
// iterate through the verbs in the second map
while (verb_enum.hasNext()) {
String verb = (String)verb_enum.next();
List cmdVector = (List)clonedHash.get(verb);
if (cmdVector == null) {
clonedHash.put(verb, second.get(verb));
} else {
// merge the two
List oldV = (List)second.get(verb);
cmdVector = new ArrayList(cmdVector);
cmdVector.addAll(oldV);
clonedHash.put(verb, cmdVector);
}
}
return clonedHash;
}
/**
* appendToMailcap: Append to this Mailcap DB, use the mailcap
* format:
* Comment == "# <i>comment string
* Entry == "mimetype; javabeanclass<nl>
*
* Example:
* # this is a comment
* image/gif jaf.viewers.ImageViewer
*/
public void appendToMailcap(String mail_cap) {
if (LogSupport.isLoggable())
LogSupport.log("appendToMailcap: " + mail_cap);
try {
parse(new StringReader(mail_cap));
} catch (IOException ex) {
// can't happen
}
}
/**
* parse file into a hash table of MC Type Entry Obj
*/
private void parse(Reader reader) throws IOException {
BufferedReader buf_reader = new BufferedReader(reader);
String line = null;
String continued = null;
while ((line = buf_reader.readLine()) != null) {
// LogSupport.log("parsing line: " + line);
line = line.trim();
try {
if (line.charAt(0) == '#')
continue;
if (line.charAt(line.length() - 1) == '\\') {
if (continued != null)
continued += line.substring(0, line.length() - 1);
else
continued = line.substring(0, line.length() - 1);
} else if (continued != null) {
// handle the two strings
continued = continued + line;
// LogSupport.log("parse: " + continued);
try {
parseLine(continued);
} catch (MailcapParseException e) {
//e.printStackTrace();
}
continued = null;
}
else {
// LogSupport.log("parse: " + line);
try {
parseLine(line);
// LogSupport.log("hash.size = " + type_hash.size());
} catch (MailcapParseException e) {
//e.printStackTrace();
}
}
} catch (StringIndexOutOfBoundsException e) {}
}
}
/**
* A routine to parse individual entries in a Mailcap file.
*
* Note that this routine does not handle line continuations.
* They should have been handled prior to calling this routine.
*/
protected void parseLine(String mailcapEntry)
throws MailcapParseException, IOException {
MailcapTokenizer tokenizer = new MailcapTokenizer(mailcapEntry);
tokenizer.setIsAutoquoting(false);
if (LogSupport.isLoggable())
LogSupport.log("parse: " + mailcapEntry);
// parse the primary type
int currentToken = tokenizer.nextToken();
if (currentToken != MailcapTokenizer.STRING_TOKEN) {
reportParseError(MailcapTokenizer.STRING_TOKEN, currentToken,
tokenizer.getCurrentTokenValue());
}
String primaryType =
tokenizer.getCurrentTokenValue().toLowerCase(Locale.ENGLISH);
String subType = "*";
// parse the '/' between primary and sub
// if it's not present that's ok, we just don't have a subtype
currentToken = tokenizer.nextToken();
if ((currentToken != MailcapTokenizer.SLASH_TOKEN) &&
(currentToken != MailcapTokenizer.SEMICOLON_TOKEN)) {
reportParseError(MailcapTokenizer.SLASH_TOKEN,
MailcapTokenizer.SEMICOLON_TOKEN, currentToken,
tokenizer.getCurrentTokenValue());
}
// only need to look for a sub type if we got a '/'
if (currentToken == MailcapTokenizer.SLASH_TOKEN) {
// parse the sub type
currentToken = tokenizer.nextToken();
if (currentToken != MailcapTokenizer.STRING_TOKEN) {
reportParseError(MailcapTokenizer.STRING_TOKEN,
currentToken, tokenizer.getCurrentTokenValue());
}
subType =
tokenizer.getCurrentTokenValue().toLowerCase(Locale.ENGLISH);
// get the next token to simplify the next step
currentToken = tokenizer.nextToken();
}
String mimeType = primaryType + "/" + subType;
if (LogSupport.isLoggable())
LogSupport.log(" Type: " + mimeType);
// now setup the commands hashtable
Map commands = new LinkedHashMap(); // keep commands in order found
// parse the ';' that separates the type from the parameters
if (currentToken != MailcapTokenizer.SEMICOLON_TOKEN) {
reportParseError(MailcapTokenizer.SEMICOLON_TOKEN,
currentToken, tokenizer.getCurrentTokenValue());
}
// eat it
// parse the required view command
tokenizer.setIsAutoquoting(true);
currentToken = tokenizer.nextToken();
tokenizer.setIsAutoquoting(false);
if ((currentToken != MailcapTokenizer.STRING_TOKEN) &&
(currentToken != MailcapTokenizer.SEMICOLON_TOKEN)) {
reportParseError(MailcapTokenizer.STRING_TOKEN,
MailcapTokenizer.SEMICOLON_TOKEN, currentToken,
tokenizer.getCurrentTokenValue());
}
if (currentToken == MailcapTokenizer.STRING_TOKEN) {
// have a native comand, save the entire mailcap entry
//String nativeCommand = tokenizer.getCurrentTokenValue();
List v = (List)native_commands.get(mimeType);
if (v == null) {
v = new ArrayList();
v.add(mailcapEntry);
native_commands.put(mimeType, v);
} else {
// XXX - check for duplicates?
v.add(mailcapEntry);
}
}
// only have to get the next token if the current one isn't a ';'
if (currentToken != MailcapTokenizer.SEMICOLON_TOKEN) {
currentToken = tokenizer.nextToken();
}
// look for a ';' which will indicate whether
// a parameter list is present or not
if (currentToken == MailcapTokenizer.SEMICOLON_TOKEN) {
boolean isFallback = false;
do {
// eat the ';'
// parse the parameter name
currentToken = tokenizer.nextToken();
if (currentToken != MailcapTokenizer.STRING_TOKEN) {
reportParseError(MailcapTokenizer.STRING_TOKEN,
currentToken, tokenizer.getCurrentTokenValue());
}
String paramName = tokenizer.getCurrentTokenValue().
toLowerCase(Locale.ENGLISH);
// parse the '=' which separates the name from the value
currentToken = tokenizer.nextToken();
if ((currentToken != MailcapTokenizer.EQUALS_TOKEN) &&
(currentToken != MailcapTokenizer.SEMICOLON_TOKEN) &&
(currentToken != MailcapTokenizer.EOI_TOKEN)) {
reportParseError(MailcapTokenizer.EQUALS_TOKEN,
MailcapTokenizer.SEMICOLON_TOKEN,
MailcapTokenizer.EOI_TOKEN,
currentToken, tokenizer.getCurrentTokenValue());
}
// we only have a useful command if it is named
if (currentToken == MailcapTokenizer.EQUALS_TOKEN) {
// eat it
// parse the parameter value (which is autoquoted)
tokenizer.setIsAutoquoting(true);
currentToken = tokenizer.nextToken();
tokenizer.setIsAutoquoting(false);
if (currentToken != MailcapTokenizer.STRING_TOKEN) {
reportParseError(MailcapTokenizer.STRING_TOKEN,
currentToken, tokenizer.getCurrentTokenValue());
}
String paramValue =
tokenizer.getCurrentTokenValue();
// add the class to the list iff it is one we care about
if (paramName.startsWith("x-java-")) {
String commandName = paramName.substring(7);
// 7 == "x-java-".length
if (commandName.equals("fallback-entry") &&
paramValue.equalsIgnoreCase("true")) {
isFallback = true;
} else {
// setup the class entry list
if (LogSupport.isLoggable())
LogSupport.log(" Command: " + commandName +
", Class: " + paramValue);
List classes = (List)commands.get(commandName);
if (classes == null) {
classes = new ArrayList();
commands.put(commandName, classes);
}
if (addReverse)
classes.add(0, paramValue);
else
classes.add(paramValue);
}
}
// set up the next iteration
currentToken = tokenizer.nextToken();
}
} while (currentToken == MailcapTokenizer.SEMICOLON_TOKEN);
Map masterHash = isFallback ? fallback_hash : type_hash;
Map curcommands =
(Map)masterHash.get(mimeType);
if (curcommands == null) {
masterHash.put(mimeType, commands);
} else {
if (LogSupport.isLoggable())
LogSupport.log("Merging commands for type " + mimeType);
// have to merge current and new commands
// first, merge list of classes for commands already known
Iterator cn = curcommands.keySet().iterator();
while (cn.hasNext()) {
String cmdName = (String)cn.next();
List ccv = (List)curcommands.get(cmdName);
List cv = (List)commands.get(cmdName);
if (cv == null)
continue;
// add everything in cv to ccv, if it's not already there
Iterator cvn = cv.iterator();
while (cvn.hasNext()) {
String clazz = (String)cvn.next();
if (!ccv.contains(clazz))
if (addReverse)
ccv.add(0, clazz);
else
ccv.add(clazz);
}
}
// now, add commands not previously known
cn = commands.keySet().iterator();
while (cn.hasNext()) {
String cmdName = (String)cn.next();
if (curcommands.containsKey(cmdName))
continue;
List cv = (List)commands.get(cmdName);
curcommands.put(cmdName, cv);
}
}
} else if (currentToken != MailcapTokenizer.EOI_TOKEN) {
reportParseError(MailcapTokenizer.EOI_TOKEN,
MailcapTokenizer.SEMICOLON_TOKEN,
currentToken, tokenizer.getCurrentTokenValue());
}
}
protected static void reportParseError(int expectedToken, int actualToken,
String actualTokenValue) throws MailcapParseException {
throw new MailcapParseException("Encountered a " +
MailcapTokenizer.nameForToken(actualToken) + " token (" +
actualTokenValue + ") while expecting a " +
MailcapTokenizer.nameForToken(expectedToken) + " token.");
}
protected static void reportParseError(int expectedToken,
int otherExpectedToken, int actualToken, String actualTokenValue)
throws MailcapParseException {
throw new MailcapParseException("Encountered a " +
MailcapTokenizer.nameForToken(actualToken) + " token (" +
actualTokenValue + ") while expecting a " +
MailcapTokenizer.nameForToken(expectedToken) + " or a " +
MailcapTokenizer.nameForToken(otherExpectedToken) + " token.");
}
protected static void reportParseError(int expectedToken,
int otherExpectedToken, int anotherExpectedToken, int actualToken,
String actualTokenValue) throws MailcapParseException {
if (LogSupport.isLoggable())
LogSupport.log("PARSE ERROR: " + "Encountered a " +
MailcapTokenizer.nameForToken(actualToken) + " token (" +
actualTokenValue + ") while expecting a " +
MailcapTokenizer.nameForToken(expectedToken) + ", a " +
MailcapTokenizer.nameForToken(otherExpectedToken) + ", or a " +
MailcapTokenizer.nameForToken(anotherExpectedToken) + " token.");
throw new MailcapParseException("Encountered a " +
MailcapTokenizer.nameForToken(actualToken) + " token (" +
actualTokenValue + ") while expecting a " +
MailcapTokenizer.nameForToken(expectedToken) + ", a " +
MailcapTokenizer.nameForToken(otherExpectedToken) + ", or a " +
MailcapTokenizer.nameForToken(anotherExpectedToken) + " token.");
}
/** for debugging
public static void main(String[] args) throws Exception {
Map masterHash = new HashMap();
for (int i = 0; i < args.length; ++i) {
System.out.println("Entry " + i + ": " + args[i]);
parseLine(args[i], masterHash);
}
Enumeration types = masterHash.keys();
while (types.hasMoreElements()) {
String key = (String)types.nextElement();
System.out.println("MIME Type: " + key);
Map commandHash = (Map)masterHash.get(key);
Enumeration commands = commandHash.keys();
while (commands.hasMoreElements()) {
String command = (String)commands.nextElement();
System.out.println(" Command: " + command);
Vector classes = (Vector)commandHash.get(command);
for (int i = 0; i < classes.size(); ++i) {
System.out.println(" Class: " +
(String)classes.elementAt(i));
}
}
System.out.println("");
}
}
*/
}
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