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package javax.activation;
import java.io.*;
import java.net.*;
import java.util.*;
import java.security.
AccessController;
import java.security.
PrivilegedAction;
import com.sun.activation.registries.
MimeTypeFile;
import com.sun.activation.registries.
LogSupport;
/**
* This class extends FileTypeMap and provides data typing of files
* via their file extension. It uses the <code>.mime.types</code> format. <p>
*
* <b>MIME types file search order:</b><p>
* The MimetypesFileTypeMap looks in various places in the user's
* system for MIME types file entries. When requests are made
* to search for MIME types in the MimetypesFileTypeMap, it searches
* MIME types files in the following order:
* <ol>
* <li> Programmatically added entries to the MimetypesFileTypeMap instance.
* <li> The file <code>.mime.types</code> in the user's home directory.
* <li> The file <code>mime.types</code> in the Java runtime.
* <li> The file or resources named <code>META-INF/mime.types</code>.
* <li> The file or resource named <code>META-INF/mimetypes.default</code>
* (usually found only in the <code>activation.jar</code> file).
* </ol>
* <p>
* (The current implementation looks for the <code>mime.types</code> file
* in the Java runtime in the directory <code><i>java.home</i>/conf</code>
* if it exists, and otherwise in the directory
* <code><i>java.home</i>/lib</code>, where <i>java.home</i> is the value
* of the "java.home" System property. Note that the "conf" directory was
* introduced in JDK 9.)
* <p>
* <b>MIME types file format:</b><p>
*
* <code>
* # comments begin with a '#'<br>
* # the format is <mime type> <space separated file extensions><br>
* # for example:<br>
* text/plain txt text TXT<br>
* # this would map file.txt, file.text, and file.TXT to<br>
* # the mime type "text/plain"<br>
* </code>
*
* @author Bart Calder
* @author Bill Shannon
*/
public class
MimetypesFileTypeMap extends
FileTypeMap {
/*
* We manage a collection of databases, searched in order.
*/
private
MimeTypeFile[]
DB;
private static final int
PROG = 0; // programmatically added entries
private static final
String defaultType = "application/octet-stream";
private static final
String confDir;
static {
String dir = null;
try {
dir = (
String)
AccessController.
doPrivileged(
new
PrivilegedAction() {
public
Object run() {
String home =
System.
getProperty("java.home");
String newdir =
home +
File.
separator + "conf";
File conf = new
File(
newdir);
if (
conf.
exists())
return
newdir +
File.
separator;
else
return
home +
File.
separator + "lib" +
File.
separator;
}
});
} catch (
Exception ex) {
// ignore any exceptions
}
confDir =
dir;
}
/**
* The default constructor.
*/
public
MimetypesFileTypeMap() {
Vector dbv = new
Vector(5); // usually 5 or less databases
MimeTypeFile mf = null;
dbv.
addElement(null); // place holder for PROG entry
LogSupport.
log("MimetypesFileTypeMap: load HOME");
try {
String user_home =
System.
getProperty("user.home");
if (
user_home != null) {
String path =
user_home +
File.
separator + ".mime.types";
mf =
loadFile(
path);
if (
mf != null)
dbv.
addElement(
mf);
}
} catch (
SecurityException ex) {}
LogSupport.
log("MimetypesFileTypeMap: load SYS");
try {
// check system's home
if (
confDir != null) {
mf =
loadFile(
confDir + "mime.types");
if (
mf != null)
dbv.
addElement(
mf);
}
} catch (
SecurityException ex) {}
LogSupport.
log("MimetypesFileTypeMap: load JAR");
// load from the app's jar file
loadAllResources(
dbv, "META-INF/mime.types");
LogSupport.
log("MimetypesFileTypeMap: load DEF");
mf =
loadResource("/META-INF/mimetypes.default");
if (
mf != null)
dbv.
addElement(
mf);
DB = new
MimeTypeFile[
dbv.
size()];
dbv.
copyInto(
DB);
}
/**
* Load from the named resource.
*/
private
MimeTypeFile loadResource(
String name) {
InputStream clis = null;
try {
clis =
SecuritySupport.
getResourceAsStream(this.
getClass(),
name);
if (
clis != null) {
MimeTypeFile mf = new
MimeTypeFile(
clis);
if (
LogSupport.
isLoggable())
LogSupport.
log("MimetypesFileTypeMap: successfully " +
"loaded mime types file: " +
name);
return
mf;
} else {
if (
LogSupport.
isLoggable())
LogSupport.
log("MimetypesFileTypeMap: not loading " +
"mime types file: " +
name);
}
} catch (
IOException e) {
if (
LogSupport.
isLoggable())
LogSupport.
log("MimetypesFileTypeMap: can't load " +
name,
e);
} catch (
SecurityException sex) {
if (
LogSupport.
isLoggable())
LogSupport.
log("MimetypesFileTypeMap: can't load " +
name,
sex);
} finally {
try {
if (
clis != null)
clis.
close();
} catch (
IOException ex) { } // ignore it
}
return null;
}
/**
* Load all of the named resource.
*/
private void
loadAllResources(
Vector v,
String name) {
boolean
anyLoaded = false;
try {
URL[]
urls;
ClassLoader cld = null;
// First try the "application's" class loader.
cld =
SecuritySupport.
getContextClassLoader();
if (
cld == null)
cld = this.
getClass().
getClassLoader();
if (
cld != null)
urls =
SecuritySupport.
getResources(
cld,
name);
else
urls =
SecuritySupport.
getSystemResources(
name);
if (
urls != null) {
if (
LogSupport.
isLoggable())
LogSupport.
log("MimetypesFileTypeMap: getResources");
for (int
i = 0;
i <
urls.length;
i++) {
URL url =
urls[
i];
InputStream clis = null;
if (
LogSupport.
isLoggable())
LogSupport.
log("MimetypesFileTypeMap: URL " +
url);
try {
clis =
SecuritySupport.
openStream(
url);
if (
clis != null) {
v.
addElement(new
MimeTypeFile(
clis));
anyLoaded = true;
if (
LogSupport.
isLoggable())
LogSupport.
log("MimetypesFileTypeMap: " +
"successfully loaded " +
"mime types from URL: " +
url);
} else {
if (
LogSupport.
isLoggable())
LogSupport.
log("MimetypesFileTypeMap: " +
"not loading " +
"mime types from URL: " +
url);
}
} catch (
IOException ioex) {
if (
LogSupport.
isLoggable())
LogSupport.
log("MimetypesFileTypeMap: can't load " +
url,
ioex);
} catch (
SecurityException sex) {
if (
LogSupport.
isLoggable())
LogSupport.
log("MimetypesFileTypeMap: can't load " +
url,
sex);
} finally {
try {
if (
clis != null)
clis.
close();
} catch (
IOException cex) { }
}
}
}
} catch (
Exception ex) {
if (
LogSupport.
isLoggable())
LogSupport.
log("MimetypesFileTypeMap: can't load " +
name,
ex);
}
// if failed to load anything, fall back to old technique, just in case
if (!
anyLoaded) {
LogSupport.
log("MimetypesFileTypeMap: !anyLoaded");
MimeTypeFile mf =
loadResource("/" +
name);
if (
mf != null)
v.
addElement(
mf);
}
}
/**
* Load the named file.
*/
private
MimeTypeFile loadFile(
String name) {
MimeTypeFile mtf = null;
try {
mtf = new
MimeTypeFile(
name);
} catch (
IOException e) {
// e.printStackTrace();
}
return
mtf;
}
/**
* Construct a MimetypesFileTypeMap with programmatic entries
* added from the named file.
*
* @param mimeTypeFileName the file name
* @exception IOException for errors reading the file
*/
public
MimetypesFileTypeMap(
String mimeTypeFileName) throws
IOException {
this();
DB[
PROG] = new
MimeTypeFile(
mimeTypeFileName);
}
/**
* Construct a MimetypesFileTypeMap with programmatic entries
* added from the InputStream.
*
* @param is the input stream to read from
*/
public
MimetypesFileTypeMap(
InputStream is) {
this();
try {
DB[
PROG] = new
MimeTypeFile(
is);
} catch (
IOException ex) {
// XXX - really should throw it
}
}
/**
* Prepend the MIME type values to the registry.
*
* @param mime_types A .mime.types formatted string of entries.
*/
public synchronized void
addMimeTypes(
String mime_types) {
// check to see if we have created the registry
if (
DB[
PROG] == null)
DB[
PROG] = new
MimeTypeFile(); // make one
DB[
PROG].
appendToRegistry(
mime_types);
}
/**
* Return the MIME type of the file object.
* The implementation in this class calls
* <code>getContentType(f.getName())</code>.
*
* @param f the file
* @return the file's MIME type
*/
public
String getContentType(
File f) {
return this.
getContentType(
f.
getName());
}
/**
* Return the MIME type based on the specified file name.
* The MIME type entries are searched as described above under
* <i>MIME types file search order</i>.
* If no entry is found, the type "application/octet-stream" is returned.
*
* @param filename the file name
* @return the file's MIME type
*/
public synchronized
String getContentType(
String filename) {
int
dot_pos =
filename.
lastIndexOf("."); // period index
if (
dot_pos < 0)
return
defaultType;
String file_ext =
filename.
substring(
dot_pos + 1);
if (
file_ext.
length() == 0)
return
defaultType;
for (int
i = 0;
i <
DB.length;
i++) {
if (
DB[
i] == null)
continue;
String result =
DB[
i].
getMIMETypeString(
file_ext);
if (
result != null)
return
result;
}
return
defaultType;
}
/**
* for debugging...
*
public static void main(String[] argv) throws Exception {
MimetypesFileTypeMap map = new MimetypesFileTypeMap();
System.out.println("File " + argv[0] + " has MIME type " +
map.getContentType(argv[0]));
System.exit(0);
}
*/
}