Package org.apache.nutch.plugin

Class URLStreamHandlerFactory

java.lang.Object

org.apache.nutch.plugin.URLStreamHandlerFactory

All Implemented Interfaces:

URLStreamHandlerFactory

public class URLStreamHandlerFactory
extends Object
implements URLStreamHandlerFactory

This URLStreamHandlerFactory knows about all the plugins in use and thus can create the correct URLStreamHandler even if it comes from a plugin classpath. As the JVM allows only one instance of URLStreamHandlerFactory to be registered, this class implements a singleton pattern.

Author:

Hiran Chaudhuri

Field Summary

Fields

Modifier and Type	Field	Description
protected static final org.slf4j.Logger	LOG
static final String[]	SYSTEM_PROTOCOLS	Protocols covered by standard JVM URL handlers.

Method Summary

Modifier and Type	Method	Description
URLStreamHandler	createURLStreamHandler(String protocol)
static URLStreamHandlerFactory	getInstance()	Get the singleton instance of this class.
void	registerPluginRepository(PluginRepository pr)	Use this method once a new PluginRepository was created to register it.

Methods inherited from class java.lang.Object

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

Field Details

LOG

protected static final org.slf4j.Logger LOG

SYSTEM_PROTOCOLS

public static final String[] SYSTEM_PROTOCOLS

Protocols covered by standard JVM URL handlers. These protocols must not be handled by Nutch plugins, in order to avoid that basic actions (eg. loading of classes and configuration files) break. Also the "ftp" protocol is included: it's usually supported by the standard JVM URL handler and Nutch does not yet provide a dedicated URL stream handler.

Method Details

getInstance

public static URLStreamHandlerFactory getInstance()

Get the singleton instance of this class.

Returns:

a URLStreamHandlerFactory instance

registerPluginRepository

public void registerPluginRepository(PluginRepository pr)

Use this method once a new PluginRepository was created to register it.

Parameters:

pr - The PluginRepository to be registered.

createURLStreamHandler

public URLStreamHandler createURLStreamHandler(String protocol)

Specified by:

createURLStreamHandler in interface URLStreamHandlerFactory