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package com.sun.mail.util;
import java.lang.reflect.*;
import java.security.*;
import javax.mail.internet.MimePart;
/**
* General MIME-related utility methods.
*
* @author Bill Shannon
* @since JavaMail 1.4.4
*/
public class MimeUtil {
private static final Method cleanContentType;
static {
Method meth = null;
try {
String cth = System.getProperty("mail.mime.contenttypehandler");
if (cth != null) {
ClassLoader cl = getContextClassLoader();
Class clsHandler = null;
if (cl != null) {
try {
clsHandler = Class.forName(cth, false, cl);
} catch (ClassNotFoundException cex) { }
}
if (clsHandler == null)
clsHandler = Class.forName(cth);
meth = clsHandler.getMethod("cleanContentType",
new Class[] { MimePart.class, String.class });
}
} catch (ClassNotFoundException ex) {
// ignore it
} catch (NoSuchMethodException ex) {
// ignore it
} catch (RuntimeException ex) {
// ignore it
} finally {
cleanContentType = meth;
}
}
// No one should instantiate this class.
private MimeUtil() {
}
/**
* If a Content-Type handler has been specified,
* call it to clean up the Content-Type value.
*
* @param mp the MimePart
* @param contentType the Content-Type value
* @return the cleaned Content-Type value
*/
public static String cleanContentType(MimePart mp, String contentType) {
if (cleanContentType != null) {
try {
return (String)cleanContentType.invoke(null,
new Object[] { mp, contentType });
} catch (Exception ex) {
return contentType;
}
} else
return contentType;
}
/**
* Convenience method to get our context class loader.
* Assert any privileges we might have and then call the
* Thread.getContextClassLoader method.
*/
private static ClassLoader getContextClassLoader() {
return
AccessController.doPrivileged(new PrivilegedAction() {
@Override
public ClassLoader run() {
ClassLoader cl = null;
try {
cl = Thread.currentThread().getContextClassLoader();
} catch (SecurityException ex) { }
return cl;
}
});
}
}