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

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static String` | `DEFAULT_HANDLER_MAPPINGS_LOCATION` The location to look for the mapping files.
    `protected Log` | `logger` Logger available to subclasses

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `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

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `NamespaceHandler` | `resolve(String namespaceUri)` Locate the `NamespaceHandler` for the supplied namespace URI from the configured mappings.
    `String` | `toString()`

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

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

    - #### toString

          public String toString()

      Overrides:
        `toString` in class `Object`