javassist

Class URLClassPath

java.lang.Object

javassist.URLClassPath

All Implemented Interfaces:

ClassPath

public class URLClassPath
extends Object
implements ClassPath

A class search-path specified with URL (http).

See Also:

ClassPath, ClassPool.insertClassPath(ClassPath), ClassPool.appendClassPath(ClassPath)

Field Summary

Fields

Modifier and Type	Field and Description
protected String	directory
protected String	hostname
protected String	packageName
protected int	port

Constructor Summary

Constructors

Constructor and Description
URLClassPath(String host, int port, String directory, String packageName) Creates a search path specified with URL (http).

Method Summary

Modifier and Type	Method and Description
void	close() Closes this class path.
static byte[]	fetchClass(String host, int port, String directory, String classname) Reads a class file on an http server.
URL	find(String classname) Returns the URL.
InputStream	openClassfile(String classname) Opens a class file with http.
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

hostname

protected String hostname

port

protected int port

directory

protected String directory

packageName

protected String packageName

Constructor Detail

URLClassPath

public URLClassPath(String host,
                    int port,
                    String directory,
                    String packageName)

Creates a search path specified with URL (http).

This search path is used only if a requested class name starts with the name specified by packageName. If packageName is "org.javassist." and a requested class is "org.javassist.test.Main", then the given URL is used for loading that class. The URLClassPath obtains a class file from:

http://www.javassist.org:80/java/classes/org/javassist/test/Main.class
 

Here, we assume that host is "www.javassist.org", port is 80, and directory is "/java/classes/".

If packageName is null, the URL is used for loading any class.

Parameters:

host - host name

port - port number

directory - directory name ending with "/". It can be "/" (root directory). It must start with "/".

packageName - package name. It must end with "." (dot).

Method Detail

toString

public String toString()

Overrides:

toString in class Object

openClassfile

public InputStream openClassfile(String classname)

Opens a class file with http.

Specified by:

openClassfile in interface ClassPath

Parameters:

classname - a fully-qualified class name

Returns:

null if the class file could not be found.

See Also:

Translator

find

public URL find(String classname)

Returns the URL.

Specified by:

find in interface ClassPath

Parameters:

classname - a fully-qualified class name.

Returns:

null if the class file could not be obtained.

close

public void close()

Closes this class path.

Specified by:

close in interface ClassPath

fetchClass

public static byte[] fetchClass(String host,
                                int port,
                                String directory,
                                String classname)
                         throws IOException

Reads a class file on an http server.

Parameters:

host - host name

port - port number

directory - directory name ending with "/". It can be "/" (root directory). It must start with "/".

classname - fully-qualified class name

Throws:

IOException