# Class TomcatURLStreamHandlerFactory

java.lang.Object
org.apache.catalina.webresources.TomcatURLStreamHandlerFactory

All Implemented Interfaces:
  `URLStreamHandlerFactory`

public class TomcatURLStreamHandlerFactory extends Object implements URLStreamHandlerFactory

## Method Summary

Modifier and Type
Method
Description
`void`
`addUserFactory(URLStreamHandlerFactory factory)`
Since the JVM only allows a single call to `URL.setURLStreamHandlerFactory(URLStreamHandlerFactory)` and Tomcat needs to register a handler, provide a mechanism to allow applications to register their own handlers.
`URLStreamHandler`
`createURLStreamHandler(String protocol)`
`static boolean`
`disable()`
Prevent this factory from registering with the JVM.
`static TomcatURLStreamHandlerFactory`
`getInstance()`
Obtain a reference to the singleton instance.
`boolean`
`isRegistered()`
`static boolean`
`register()`
Register this factory with the JVM.
`static void`
`release(ClassLoader classLoader)`
Release references to any user provided factories that have been loaded using the provided class loader.

### Methods inherited from class java.lang.Object

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

## Method Details

### getInstance

public static TomcatURLStreamHandlerFactory getInstance()
Obtain a reference to the singleton instance. It is recommended that callers check the value of `isRegistered()` before using the returned instance.

Returns:
  A reference to the singleton instance

### register

public static boolean register()
Register this factory with the JVM. May be called more than once. The implementation ensures that registration only occurs once.

Returns:
  `true` if the factory is already registered with the JVM or was successfully registered as a result of this call. `false` if the factory was disabled prior to this call.

### disable

public static boolean disable()
Prevent this factory from registering with the JVM. May be called more than once.

Returns:
  `true` if the factory is already disabled or was successfully disabled as a result of this call. `false` if the factory was already registered prior to this call.

### release

public static void release(ClassLoader classLoader)
Release references to any user provided factories that have been loaded using the provided class loader. Called during web application stop to prevent memory leaks.

Parameters:
  `classLoader` - The class loader to release

### isRegistered

public boolean isRegistered()

### addUserFactory

public void addUserFactory(URLStreamHandlerFactory factory)
Since the JVM only allows a single call to `URL.setURLStreamHandlerFactory(URLStreamHandlerFactory)` and Tomcat needs to register a handler, provide a mechanism to allow applications to register their own handlers.

Parameters:
  `factory` - The user provided factory to add to the factories Tomcat has already registered

### createURLStreamHandler

public URLStreamHandler createURLStreamHandler(String protocol)

Specified by:
  `createURLStreamHandler` in interface `URLStreamHandlerFactory`