org.apache.xml.dtm
Interface DTMFilter
public interface DTMFilter
Simple filter for doing node tests. Note the semantics of this are
somewhat different that the DOM's NodeFilter.
short | acceptNode(int nodeHandle, int whatToShow) - Test whether a specified node is visible in the logical view of a
DTMIterator .
|
short | acceptNode(int nodeHandle, int whatToShow, int expandedName) - Test whether a specified node is visible in the logical view of a
DTMIterator .
|
SHOW_ALL
public static final int SHOW_ALL
Show all Nodes
.
SHOW_ATTRIBUTE
public static final int SHOW_ATTRIBUTE
Show Attr
nodes. This is meaningful only when creating an
iterator or tree-walker 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 main document tree.
SHOW_BYFUNCTION
public static final int SHOW_BYFUNCTION
Special bit for filters implementing match patterns starting with
a function. Make sure this does not conflict with
NodeFilter
.
%REVIEW% Might be safer to start from higher bits and work down,
to leave room for the DOM to expand its set of constants... Or,
possibly, to create a DTM-specific field for these additional bits.
SHOW_CDATA_SECTION
public static final int SHOW_CDATA_SECTION
Show CDATASection
nodes.
SHOW_COMMENT
public static final int SHOW_COMMENT
Show Comment
nodes.
SHOW_DOCUMENT
public static final int SHOW_DOCUMENT
Show Document
nodes. (Of course, as with Attributes
and such, this is meaningful only when the iteration root is the
Document itself, since Document has no parent.)
SHOW_DOCUMENT_FRAGMENT
public static final int SHOW_DOCUMENT_FRAGMENT
Show DocumentFragment
nodes. (Of course, as with
Attributes and such, this is meaningful only when the iteration
root is the Document itself, since DocumentFragment has no parent.)
SHOW_DOCUMENT_TYPE
public static final int SHOW_DOCUMENT_TYPE
Show DocumentType
nodes.
SHOW_ELEMENT
public static final int SHOW_ELEMENT
Show Element
nodes.
SHOW_ENTITY
public static final int SHOW_ENTITY
Show Entity
nodes. This is meaningful only when creating
an iterator or tree-walker 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 main document tree.
SHOW_ENTITY_REFERENCE
public static final int SHOW_ENTITY_REFERENCE
Show EntityReference
nodes. Note that if Entity References
have been fully expanded while the tree was being constructed, these
nodes will not appear and this mask has no effect.
SHOW_NAMESPACE
public static final int SHOW_NAMESPACE
This bit instructs the iterator to show namespace nodes, which
are modeled by DTM but not by the DOM. Make sure this does not
conflict with
NodeFilter
.
%REVIEW% Might be safer to start from higher bits and work down,
to leave room for the DOM to expand its set of constants... Or,
possibly, to create a DTM-specific field for these additional bits.
SHOW_NOTATION
public static final int SHOW_NOTATION
Show Notation
nodes. This is meaningful only when creating
an iterator or tree-walker 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 main document tree.
SHOW_PROCESSING_INSTRUCTION
public static final int SHOW_PROCESSING_INSTRUCTION
Show ProcessingInstruction
nodes.
SHOW_TEXT
public static final int SHOW_TEXT
Show Text
nodes.
acceptNode
public short acceptNode(int nodeHandle,
int whatToShow)
Test whether a specified node is visible in the logical view of a
DTMIterator
. Normally, this function
will be called by the implementation of DTMIterator
;
it is not normally called directly from
user code.
nodeHandle
- int Handle of the node.whatToShow
- one of SHOW_XXX values.
- one of FILTER_ACCEPT, FILTER_REJECT, or FILTER_SKIP.
acceptNode
public short acceptNode(int nodeHandle,
int whatToShow,
int expandedName)
Test whether a specified node is visible in the logical view of a
DTMIterator
. Normally, this function
will be called by the implementation of
DTMIterator
;
it is not normally called directly from
user code.
TODO: Should this be setNameMatch(expandedName) followed by accept()?
Or will we really be testing a different name at every invocation?
%REVIEW% Under what circumstances will this be used? The cases
I've considered are just as easy and just about as efficient if
the name test is performed in the DTMIterator... -- Joe
%REVIEW% Should that 0xFFFF have a mnemonic assigned to it?
Also: This representation is assuming the expanded name is indeed
split into high/low 16-bit halfwords. If we ever change the
balance between namespace and localname bits (eg because we
decide there are many more localnames than namespaces, which is
fairly likely), this is going to break. It might be safer to
encapsulate the details with a makeExpandedName method and make
that responsible for setting up the wildcard version as well.
nodeHandle
- int Handle of the node.whatToShow
- one of SHOW_XXX values.expandedName
- a value defining the exanded name as defined in
the DTM interface. Wild cards will be defined
by 0xFFFF in the namespace and/or localname
portion of the expandedName.
- one of FILTER_ACCEPT, FILTER_REJECT, or FILTER_SKIP.
Copyright B) 2004 Apache XML Project. All Rights Reserved.