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//
// NodeFilter.h
//
// $Id: //poco/1.3/XML/include/Poco/DOM/NodeFilter.h#1 $
//
// Library: XML
// Package: DOM
// Module: NodeFilter
//
// Definition of the DOM NodeFilter interface.
//
// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
//
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//
#ifndef DOM_NodeFilter_INCLUDED
#define DOM_NodeFilter_INCLUDED
#include "Poco/XML/XML.h"
#include "Poco/XML/XMLString.h"
namespace Poco {
namespace XML {
class Node;
class XML_API NodeFilter
/// Filters are objects that know how to "filter out" nodes. If a 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.
{
public:
enum
{
FILTER_ACCEPT = 1,
/// Accept the node. Navigation methods defined for NodeIterator or TreeWalker will return this node.
FILTER_REJECT = 2,
/// Reject the node. Navigation methods defined for 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.
FILTER_SKIP = 3
/// Skip this single node. Navigation methods defined for NodeIterator or TreeWalker
/// will not return this node. For both NodeIterator and TreeWalker, the children
/// of this node will still be considered.
};
enum WhatToShow
/// These are the available values for the whatToShow parameter used in TreeWalkers
/// and NodeIterators. They are the same as the set of possible types for Node,
/// and their values are derived by using a bit position corresponding to the
/// value of nodeType for the equivalent node type. If a bit in whatToShow is
/// set false, that will be taken as a request to skip over this type of node;
/// the behavior in that case is similar to that of FILTER_SKIP.
///
/// Note that if node types greater than 32 are ever introduced, they may not
/// be individually testable via whatToShow. If that need should arise, it can
/// be handled by selecting SHOW_ALL together with an appropriate NodeFilter.
{
SHOW_ALL = 0xFFFFFFFF,
/// Show all Nodes.
SHOW_ELEMENT = 0x00000001,
/// Show Element nodes.
SHOW_ATTRIBUTE = 0x00000002,
/// 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 document tree.
SHOW_TEXT = 0x00000004,
/// Show Text nodes.
SHOW_CDATA_SECTION = 0x00000008,
/// Show CDATASection nodes.
SHOW_ENTITY_REFERENCE = 0x00000010,
/// Show EntityReference nodes.
SHOW_ENTITY = 0x00000020,
/// 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 document tree.
SHOW_PROCESSING_INSTRUCTION = 0x00000040,
/// Show ProcessingInstruction nodes.
SHOW_COMMENT = 0x00000080,
/// Show Comment nodes.
SHOW_DOCUMENT = 0x00000100,
/// Show Document nodes.
SHOW_DOCUMENT_TYPE = 0x00000200,
/// Show DocumentType nodes.
SHOW_DOCUMENT_FRAGMENT = 0x00000400,
/// Show DocumentFragment nodes.
SHOW_NOTATION = 0x00000800
/// 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 document tree.
};
virtual short acceptNode(Node* node) = 0;
/// Test whether a specified node is visible in the logical view of a 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.)
///
/// Returns FILTER_ACCEPT, FILTER_REJECT or FILTER_SKIP.
protected:
virtual ~NodeFilter();
};
} } // namespace Poco::XML
#endif // DOM_NodeFilter_INCLUDED
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