javax.activation.MimetypesFileTypeMap Maven / Gradle / Ivy
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/*
* @(#)MimetypesFileTypeMap.java 1.18 07/05/14
*/
package javax.activation;
import java.io.*;
import java.net.*;
import java.util.*;
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 .mime.types format.
*
* MIME types file search order:
* 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:
*
*
* - Programmatically added entries to the MimetypesFileTypeMap instance.
*
- The file
.mime.types in the user's home directory.
* - The file <java.home>
/lib/mime.types.
* - The file or resources named
META-INF/mime.types.
* - The file or resource named
META-INF/mimetypes.default
* (usually found only in the activation.jar file).
*
*
* MIME types file format:
*
*
* # comments begin with a '#'
* # the format is <mime type> <space separated file extensions>
* # for example:
* text/plain txt text TXT
* # this would map file.txt, file.text, and file.TXT to
* # the mime type "text/plain"
*
*
* @author Bart Calder
* @author Bill Shannon
*/
public class MimetypesFileTypeMap extends FileTypeMap {
/*
* We manage a collection of databases, searched in order.
* The default database is shared between all instances
* of this class.
* XXX - Can we safely share more databases between instances?
*/
private static MimeTypeFile defDB = null;
private MimeTypeFile[] DB;
private static final int PROG = 0; // programmatically added entries
private static String defaultType = "application/octet-stream";
/**
* 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
String system_mimetypes = System.getProperty("java.home") +
File.separator + "lib" + File.separator + "mime.types";
mf = loadFile(system_mimetypes);
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");
synchronized (MimetypesFileTypeMap.class) {
// see if another instance has created this yet.
if (defDB == null)
defDB = loadResource("/META-INF/mimetypes.default");
}
if (defDB != null)
dbv.addElement(defDB);
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
*/
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
* getContentType(f.getName()).
*
* @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
* MIME types file search order.
* 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);
}
*/
}