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Added in API level 8

UserDataHandler

public interface UserDataHandler

org.w3c.dom.UserDataHandler


When associating an object to a key on a node using Node.setUserData() the application can provide a handler that gets called when the node the object is associated to is being cloned, imported, or renamed. This can be used by the application to implement various behaviors regarding the data it associates to the DOM nodes. This interface defines that handler.

See also the Document Object Model (DOM) Level 3 Core Specification.

Summary

Constants

short NODE_ADOPTED

The node is adopted, using Document.adoptNode().

short NODE_CLONED

The node is cloned, using Node.cloneNode().

short NODE_DELETED

The node is deleted.

short NODE_IMPORTED

The node is imported, using Document.importNode().

short NODE_RENAMED

The node is renamed, using Document.renameNode().

Public methods

abstract void handle(short operation, String key, Object data, Node src, Node dst)

This method is called whenever the node for which this handler is registered is imported or cloned.

Constants

NODE_ADOPTED

Added in API level 8
short NODE_ADOPTED

The node is adopted, using Document.adoptNode().

Constant Value: 5 (0x00000005)

NODE_CLONED

Added in API level 8
short NODE_CLONED

The node is cloned, using Node.cloneNode().

Constant Value: 1 (0x00000001)

NODE_DELETED

Added in API level 8
short NODE_DELETED

The node is deleted.

Note: This may not be supported or may not be reliable in certain environments, such as Java, where the implementation has no real control over when objects are actually deleted.

Constant Value: 3 (0x00000003)

NODE_IMPORTED

Added in API level 8
short NODE_IMPORTED

The node is imported, using Document.importNode().

Constant Value: 2 (0x00000002)

NODE_RENAMED

Added in API level 8
short NODE_RENAMED

The node is renamed, using Document.renameNode().

Constant Value: 4 (0x00000004)

Public methods

handle

Added in API level 8
void handle (short operation, 
                String key, 
                Object data, 
                Node src, 
                Node dst)

This method is called whenever the node for which this handler is registered is imported or cloned.
DOM applications must not raise exceptions in a UserDataHandler. The effect of throwing exceptions from the handler is DOM implementation dependent.

Parameters
operation short: Specifies the type of operation that is being performed on the node.
key String: Specifies the key for which this handler is being called.
data Object: Specifies the data for which this handler is being called.
src Node: Specifies the node being cloned, adopted, imported, or renamed. This is null when the node is being deleted.
dst Node: Specifies the node newly created if any, or null.
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