Interface LSParserFilter
LSParserFilters provide applications the ability to examine
nodes as they are being constructed while parsing. As each node is
examined, it may be modified or removed, or the entire parse may be
terminated early.
At the time any of the filter methods are called by the parser, the
owner Document and DOMImplementation objects exist and are accessible.
The document element is never passed to the LSParserFilter
methods, i.e. it is not possible to filter out the document element.
Document, DocumentType, Notation,
Entity, and Attr nodes are never passed to the
acceptNode method on the filter. The child nodes of an
EntityReference node are passed to the filter if the parameter
"entities"
is set to false. Note that, as described by the parameter
"entities",
unexpanded entity reference nodes are never discarded and are always
passed to the filter.
All validity checking while parsing a document occurs on the source document as it appears on the input stream, not on the DOM document as it is built in memory. With filters, the document in memory may be a subset of the document on the stream, and its validity may have been affected by the filtering.
All default attributes must be present on elements when the elements are passed to the filter methods. All other default content must be passed to the filter methods.
DOM applications must not raise exceptions in a filter. The effect of throwing exceptions from a filter is DOM implementation dependent.
See also the Document Object Model (DOM) Level 3 Load and Save Specification.
- Since:
- 1.5
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Field Summary
FieldsModifier and TypeFieldDescriptionstatic final shortAccept the node.static final shortInterrupt the normal processing of the document.static final shortReject the node and its children.static final shortSkip this single node. -
Method Summary
Modifier and TypeMethodDescriptionshortacceptNode(Node nodeArg) This method will be called by the parser at the completion of the parsing of each node.intTells theLSParserwhat types of nodes to show to the methodLSParserFilter.acceptNode.shortstartElement(Element elementArg) The parser will call this method after eachElementstart tag has been scanned, but before the remainder of theElementis processed.
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Field Details
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FILTER_ACCEPT
static final short FILTER_ACCEPTAccept the node.- See Also:
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FILTER_REJECT
static final short FILTER_REJECTReject the node and its children.- See Also:
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FILTER_SKIP
static final short FILTER_SKIPSkip this single node. The children of this node will still be considered.- See Also:
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FILTER_INTERRUPT
static final short FILTER_INTERRUPTInterrupt the normal processing of the document.- See Also:
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Method Details
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startElement
The parser will call this method after eachElementstart tag has been scanned, but before the remainder of theElementis processed. The intent is to allow the element, including any children, to be efficiently skipped. Note that only element nodes are passed to thestartElementfunction.
The element node passed tostartElementfor filtering will include all of the Element's attributes, but none of the children nodes. The Element may not yet be in place in the document being constructed (it may not have a parent node.)
AstartElementfilter function may access or change the attributes for the Element. Changing Namespace declarations will have no effect on namespace resolution by the parser.
For efficiency, the Element node passed to the filter may not be the same one as is actually placed in the tree if the node is accepted. And the actual node (node object identity) may be reused during the process of reading in and filtering a document.- Parameters:
elementArg- The newly encountered element. At the time this method is called, the element is incomplete - it will have its attributes, but no children.- Returns:
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FILTER_ACCEPTif theElementshould be included in the DOM document being built. -
FILTER_REJECTif theElementand all of its children should be rejected. -
FILTER_SKIPif theElementshould be skipped. All of its children are inserted in place of the skippedElementnode. -
FILTER_INTERRUPTif the filter wants to stop the processing of the document. Interrupting the processing of the document does no longer guarantee that the resulting DOM tree is XML well-formed. TheElementis rejected.
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acceptNode
This method will be called by the parser at the completion of the parsing of each node. The node and all of its descendants will exist and be complete. The parent node will also exist, although it may be incomplete, i.e. it may have additional children that have not yet been parsed. Attribute nodes are never passed to this function.
From within this method, the new node may be freely modified - children may be added or removed, text nodes modified, etc. The state of the rest of the document outside this node is not defined, and the affect of any attempt to navigate to, or to modify any other part of the document is undefined.
For validating parsers, the checks are made on the original document, before any modification by the filter. No validity checks are made on any document modifications made by the filter.
If this new node is rejected, the parser might reuse the new node and any of its descendants.- Parameters:
nodeArg- The newly constructed element. At the time this method is called, the element is complete - it has all of its children (and their children, recursively) and attributes, and is attached as a child to its parent.- Returns:
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FILTER_ACCEPTif thisNodeshould be included in the DOM document being built. -
FILTER_REJECTif theNodeand all of its children should be rejected. -
FILTER_SKIPif theNodeshould be skipped and theNodeshould be replaced by all the children of theNode. -
FILTER_INTERRUPTif the filter wants to stop the processing of the document. Interrupting the processing of the document does no longer guarantee that the resulting DOM tree is XML well-formed. TheNodeis accepted and will be the last completely parsed node.
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getWhatToShow
int getWhatToShow()Tells theLSParserwhat types of nodes to show to the methodLSParserFilter.acceptNode. If a node is not shown to the filter using this attribute, it is automatically included in the DOM document being built. SeeNodeFilterfor definition of the constants. The constantsSHOW_ATTRIBUTE,SHOW_DOCUMENT,SHOW_DOCUMENT_TYPE,SHOW_NOTATION,SHOW_ENTITY, andSHOW_DOCUMENT_FRAGMENTare meaningless here. Those nodes will never be passed toLSParserFilter.acceptNode.
The constants used here are defined in [DOM Level 2 Traversal and Range].
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