public interface NodeFilter
NodeIterator or TreeWalker is given a 
 NodeFilter, it applies the filter before it returns the next 
 node. If the filter says to accept the node, the traversal logic returns 
 it; otherwise, traversal looks for the next node and pretends that the 
 node that was rejected was not there.
 The DOM does not provide any filters. NodeFilter is just an 
 interface that users can implement to provide their own filters. 
 
NodeFilters do not need to know how to traverse from node 
 to node, nor do they need to know anything about the data structure that 
 is being traversed. This makes it very easy to write filters, since the 
 only thing they have to know how to do is evaluate a single node. One 
 filter may be used with a number of different kinds of traversals, 
 encouraging code reuse.
 
See also the Document Object Model (DOM) Level 2 Traversal and Range Specification.
| Modifier and Type | Field and Description | 
|---|---|
| static short | FILTER_ACCEPTAccept the node. | 
| static short | FILTER_REJECTReject the node. | 
| static short | FILTER_SKIPSkip this single node. | 
| static int | SHOW_ALLShow all  Nodes. | 
| static int | SHOW_ATTRIBUTEShow  Attrnodes. | 
| static int | SHOW_CDATA_SECTIONShow  CDATASectionnodes. | 
| static int | SHOW_COMMENTShow  Commentnodes. | 
| static int | SHOW_DOCUMENTShow  Documentnodes. | 
| static int | SHOW_DOCUMENT_FRAGMENTShow  DocumentFragmentnodes. | 
| static int | SHOW_DOCUMENT_TYPEShow  DocumentTypenodes. | 
| static int | SHOW_ELEMENTShow  Elementnodes. | 
| static int | SHOW_ENTITYShow  Entitynodes. | 
| static int | SHOW_ENTITY_REFERENCEShow  EntityReferencenodes. | 
| static int | SHOW_NOTATIONShow  Notationnodes. | 
| static int | SHOW_PROCESSING_INSTRUCTIONShow  ProcessingInstructionnodes. | 
| static int | SHOW_TEXTShow  Textnodes. | 
| Modifier and Type | Method and Description | 
|---|---|
| short | acceptNode(Node n)Test whether a specified node is visible in the logical view of a 
  TreeWalkerorNodeIterator. | 
static final short FILTER_ACCEPT
NodeIterator or TreeWalker will return this 
 node.static final short FILTER_REJECT
NodeIterator or TreeWalker will not return 
 this node. For TreeWalker, the children of this node 
 will also be rejected. NodeIterators treat this as a 
 synonym for FILTER_SKIP.static final short FILTER_SKIP
NodeIterator or TreeWalker will not return 
 this node. For both NodeIterator and 
 TreeWalker, the children of this node will still be 
 considered.static final int SHOW_ALL
Nodes.static final int SHOW_ELEMENT
Element nodes.static final int SHOW_ATTRIBUTE
Attr nodes. This is meaningful only when creating an 
 NodeIterator or TreeWalker with an 
 attribute node as its root; in this case, it means that 
 the attribute node will appear in the first position of the iteration 
 or traversal. Since attributes are never children of other nodes, 
 they do not appear when traversing over the document tree.static final int SHOW_TEXT
Text nodes.static final int SHOW_CDATA_SECTION
CDATASection nodes.static final int SHOW_ENTITY_REFERENCE
EntityReference nodes.static final int SHOW_ENTITY
Entity nodes. This is meaningful only when creating 
 an NodeIterator or TreeWalker with an 
 Entity node as its root; in this case, it 
 means that the Entity node will appear in the first 
 position of the traversal. Since entities are not part of the 
 document tree, they do not appear when traversing over the document 
 tree.static final int SHOW_PROCESSING_INSTRUCTION
ProcessingInstruction nodes.static final int SHOW_COMMENT
Comment nodes.static final int SHOW_DOCUMENT
Document nodes.static final int SHOW_DOCUMENT_TYPE
DocumentType nodes.static final int SHOW_DOCUMENT_FRAGMENT
DocumentFragment nodes.static final int SHOW_NOTATION
Notation nodes. This is meaningful only when creating 
 an NodeIterator or TreeWalker with a 
 Notation node as its root; in this case, it 
 means that the Notation node will appear in the first 
 position of the traversal. Since notations are not part of the 
 document tree, they do not appear when traversing over the document 
 tree.short acceptNode(Node n)
TreeWalker or NodeIterator. This function 
 will be called by the implementation of TreeWalker and 
 NodeIterator; it is not normally called directly from 
 user code. (Though you could do so if you wanted to use the same 
 filter to guide your own application logic.)n - The node to check to see if it passes the filter or not.Copyright © 1999-2022 The Apache Software Foundation. All Rights Reserved.