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.

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static int` | `SHOW_ALL` Show all `Nodes`.
    `static int` | `SHOW_ATTRIBUTE` Show `Attr` nodes.
    `static int` | `SHOW_BYFUNCTION` Special bit for filters implementing match patterns starting with a function.
    `static int` | `SHOW_CDATA_SECTION` Show `CDATASection` nodes.
    `static int` | `SHOW_COMMENT` Show `Comment` nodes.
    `static int` | `SHOW_DOCUMENT` Show `Document` nodes.
    `static int` | `SHOW_DOCUMENT_FRAGMENT` Show `DocumentFragment` nodes.
    `static int` | `SHOW_DOCUMENT_TYPE` Show `DocumentType` nodes.
    `static int` | `SHOW_ELEMENT` Show `Element` nodes.
    `static int` | `SHOW_ENTITY` Show `Entity` nodes.
    `static int` | `SHOW_ENTITY_REFERENCE` Show `EntityReference` nodes.
    `static int` | `SHOW_NAMESPACE` This bit instructs the iterator to show namespace nodes, which are modeled by DTM but not by the DOM.
    `static int` | `SHOW_NOTATION` Show `Notation` nodes.
    `static int` | `SHOW_PROCESSING_INSTRUCTION` Show `ProcessingInstruction` nodes.
    `static int` | `SHOW_TEXT` Show `Text` nodes.

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `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`.

- - ### Field Detail

    - #### SHOW_ALL

          static final int SHOW_ALL

      Show all `Nodes`.
      See Also:
        Constant Field Values

    - #### SHOW_ELEMENT

          static final int SHOW_ELEMENT

      Show `Element` nodes.
      See Also:
        Constant Field Values

    - #### 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.
      See Also:
        Constant Field Values

    - #### SHOW_TEXT

          static final int SHOW_TEXT

      Show `Text` nodes.
      See Also:
        Constant Field Values

    - #### SHOW_CDATA_SECTION

          static final int SHOW_CDATA_SECTION

      Show `CDATASection` nodes.
      See Also:
        Constant Field Values

    - #### 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.
      See Also:
        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.
      See Also:
        Constant Field Values

    - #### SHOW_PROCESSING_INSTRUCTION

          static final int SHOW_PROCESSING_INSTRUCTION

      Show `ProcessingInstruction` nodes.
      See Also:
        Constant Field Values

    - #### SHOW_COMMENT

          static final int SHOW_COMMENT

      Show `Comment` nodes.
      See Also:
        Constant Field Values

    - #### 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.)
      See Also:
        Constant Field Values

    - #### SHOW_DOCUMENT_TYPE

          static final int SHOW_DOCUMENT_TYPE

      Show `DocumentType` nodes.
      See Also:
        Constant Field Values

    - #### 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.)
      See Also:
        Constant Field Values

    - #### 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.
      See Also:
        Constant Field Values

    - #### 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.

      See Also:
        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.

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