## org.springframework.beans.factory.xml
Class DefaultNamespaceHandlerResolver

    java.lang.Object
      org.springframework.beans.factory.xml.DefaultNamespaceHandlerResolver

All Implemented Interfaces:
  NamespaceHandlerResolver

    public class DefaultNamespaceHandlerResolver

extends Object
implements NamespaceHandlerResolver

Default implementation of the `NamespaceHandlerResolver` interface. Resolves namespace URIs to implementation classes based on the mappings contained in mapping file.

By default, this implementation looks for the mapping file at `META-INF/spring.handlers`, but this can be changed using the `DefaultNamespaceHandlerResolver(ClassLoader, String)` constructor.

Since:
  2.0
Author:
  Rob Harrop, Juergen Hoeller
See Also:
  `NamespaceHandler`, `DefaultBeanDefinitionDocumentReader`

Field Summary
`static String` `DEFAULT_HANDLER_MAPPINGS_LOCATION` The location to look for the mapping files.
`protected Log` `logger` Logger available to subclasses

Constructor Summary
`DefaultNamespaceHandlerResolver()` Create a new `DefaultNamespaceHandlerResolver` using the default mapping file location.
`DefaultNamespaceHandlerResolver(ClassLoader classLoader)` Create a new `DefaultNamespaceHandlerResolver` using the default mapping file location.
`DefaultNamespaceHandlerResolver(ClassLoader classLoader, String handlerMappingsLocation)` Create a new `DefaultNamespaceHandlerResolver` using the supplied mapping file location.

Method Summary
`NamespaceHandler` `resolve(String namespaceUri)` Locate the `NamespaceHandler` for the supplied namespace URI from the configured mappings.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### DEFAULT_HANDLER_MAPPINGS_LOCATION

    public static final String DEFAULT_HANDLER_MAPPINGS_LOCATION

  The location to look for the mapping files. Can be present in multiple JAR files.

  See Also:
    Constant Field Values

### logger

    protected final Log logger

  Logger available to subclasses

Constructor Detail

### DefaultNamespaceHandlerResolver

    public DefaultNamespaceHandlerResolver()

  Create a new `DefaultNamespaceHandlerResolver` using the default mapping file location.

  This constructor will result in the thread context ClassLoader being used to load resources.

  See Also:
    `DEFAULT_HANDLER_MAPPINGS_LOCATION`

### DefaultNamespaceHandlerResolver

    public DefaultNamespaceHandlerResolver(ClassLoader classLoader)

  Create a new `DefaultNamespaceHandlerResolver` using the default mapping file location.

  Parameters:
    `classLoader` - the `ClassLoader` instance used to load mapping resources (may be `null`, in which case the thread context ClassLoader will be used)
  See Also:
    `DEFAULT_HANDLER_MAPPINGS_LOCATION`

### DefaultNamespaceHandlerResolver

    public DefaultNamespaceHandlerResolver(ClassLoader classLoader,
                                           String handlerMappingsLocation)

  Create a new `DefaultNamespaceHandlerResolver` using the supplied mapping file location.

  Parameters:
    `classLoader` - the `ClassLoader` instance used to load mapping resources may be `null`, in which case the thread context ClassLoader will be used)
    `handlerMappingsLocation` - the mapping file location

Method Detail

### resolve

    public NamespaceHandler resolve(String namespaceUri)

  Locate the `NamespaceHandler` for the supplied namespace URI from the configured mappings.

  Specified by:
    `resolve` in interface `NamespaceHandlerResolver`
  Parameters:
    `namespaceUri` - the relevant namespace URI
  Returns:
    the located `NamespaceHandler`, or `null` if none found

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