Interface DTMFilter


  • public interface DTMFilter
    Simple filter for doing node tests. Note the semantics of this are somewhat different that the DOM's NodeFilter.
    • Field Detail

      • SHOW_ATTRIBUTE

        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.
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        Constant Field Values
      • SHOW_CDATA_SECTION

        static final int SHOW_CDATA_SECTION
        Show CDATASection nodes.
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      • SHOW_ENTITY_REFERENCE

        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.
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        Constant Field Values
      • SHOW_ENTITY

        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.
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      • SHOW_PROCESSING_INSTRUCTION

        static final int SHOW_PROCESSING_INSTRUCTION
        Show ProcessingInstruction nodes.
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      • SHOW_DOCUMENT

        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.)
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      • SHOW_DOCUMENT_TYPE

        static final int SHOW_DOCUMENT_TYPE
        Show DocumentType nodes.
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      • SHOW_DOCUMENT_FRAGMENT

        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.)
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      • SHOW_NOTATION

        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.
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      • SHOW_NAMESPACE

        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.

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        Constant Field Values
      • SHOW_BYFUNCTION

        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.

        See Also:
        Constant Field Values
    • Method Detail

      • acceptNode

        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.
        Parameters:
        nodeHandle - int Handle of the node.
        whatToShow - one of SHOW_XXX values.
        Returns:
        one of FILTER_ACCEPT, FILTER_REJECT, or FILTER_SKIP.
      • acceptNode

        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.

        Parameters:
        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.
        Returns:
        one of FILTER_ACCEPT, FILTER_REJECT, or FILTER_SKIP.