# Class DOMImplementationRegistry

java.lang.Object
org.w3c.dom.bootstrap.DOMImplementationRegistry

public final class DOMImplementationRegistry extends Object
A factory that enables applications to obtain instances of `DOMImplementation`.

Example:

     // get an instance of the DOMImplementation registry
     DOMImplementationRegistry registry =
          DOMImplementationRegistry.newInstance();
     // get a DOM implementation the Level 3 XML module
     DOMImplementation domImpl =
          registry.getDOMImplementation("XML 3.0");

This provides an application with an implementation-independent starting point. DOM implementations may modify this class to meet new security standards or to provide *additional* fallbacks for the list of DOMImplementationSources.

Since:
  1.5, DOM Level 3
See Also:
  - `DOMImplementation`
  - `DOMImplementationSource`

- ## Field Summary

  Fields
  Modifier and Type
  Field
  Description
  `static final String`
  `PROPERTY`
  The system property to specify the DOMImplementationSource class names.

- ## Method Summary

  Modifier and Type
  Method
  Description
  `void`
  `addSource(DOMImplementationSource s)`
  Register an implementation.
  `DOMImplementation`
  `getDOMImplementation(String features)`
  Return the first implementation that has the desired features, or `null` if none is found.
  `DOMImplementationList`
  `getDOMImplementationList(String features)`
  Return a list of implementations that support the desired features.
  `static DOMImplementationRegistry`
  `newInstance()`
  Obtain a new instance of a `DOMImplementationRegistry`.

  ### Methods declared in class Object

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

- ## Field Details

  - ### PROPERTY

    public static final String PROPERTY
    The system property to specify the DOMImplementationSource class names.
    See Also:
      - Constant Field Values

- ## Method Details

  - ### newInstance

    public static DOMImplementationRegistry newInstance() throws ClassNotFoundException, InstantiationException, IllegalAccessException, ClassCastException
    Obtain a new instance of a `DOMImplementationRegistry`. The `DOMImplementationRegistry` is initialized by the application or the implementation, depending on the context, by first checking the value of the Java system property `org.w3c.dom.DOMImplementationSourceList` and the service provider whose contents are at "`META_INF/services/org.w3c.dom.DOMImplementationSourceList`". The value of this property is a white-space separated list of names of availables classes implementing the `DOMImplementationSource` interface. Each class listed in the class name list is instantiated and any exceptions encountered are thrown to the application.
    Returns:
      an initialized instance of DOMImplementationRegistry
    Throws:
      `ClassNotFoundException` - If any specified class can not be found
      `InstantiationException` - If any specified class is an interface or abstract class
      `IllegalAccessException` - If the default constructor of a specified class is not accessible
      `ClassCastException` - If any specified class does not implement `DOMImplementationSource`

  - ### getDOMImplementation

    public DOMImplementation getDOMImplementation(String features)
    Return the first implementation that has the desired features, or `null` if none is found.
    Parameters:
      `features` - A string that specifies which features are required. This is a space separated list in which each feature is specified by its name optionally followed by a space and a version number. This is something like: "XML 1.0 Traversal +Events 2.0"
    Returns:
      An implementation that has the desired features, or `null` if none found.

  - ### getDOMImplementationList

    public DOMImplementationList getDOMImplementationList(String features)
    Return a list of implementations that support the desired features.
    Parameters:
      `features` - A string that specifies which features are required. This is a space separated list in which each feature is specified by its name optionally followed by a space and a version number. This is something like: "XML 1.0 Traversal +Events 2.0"
    Returns:
      A list of DOMImplementations that support the desired features.

  - ### addSource

    public void addSource(DOMImplementationSource s)
    Register an implementation.
    Parameters:
      `s` - The source to be registered, may not be `null`