/*

 * Licensed to the Apache Software Foundation (ASF) under one or more

 * contributor license agreements.  See the NOTICE file distributed with

 * this work for additional information regarding copyright ownership.

 * The ASF licenses this file to You under the Apache License, Version 2.0

 * (the "License"); you may not use this file except in compliance with

 * the License.  You may obtain a copy of the License at

 * 

 *      http://www.apache.org/licenses/LICENSE-2.0

 * 

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

/*

 * $Id: DOM_NodeIterator.hpp 568078 2007-08-21 11:43:25Z amassari $

 */

#ifndef DOM_NodeIterator_HEADER_GUARD_

#define DOM_NodeIterator_HEADER_GUARD_

#include "DOM_NodeFilter.hpp"

#include "DOM_Node.hpp"

XERCES_CPP_NAMESPACE_BEGIN

class NodeIteratorImpl;

/**

 * NodeIterators are used to step through a set of nodes

 * e.g. the set of nodes in a NodeList, the document subtree governed by

 * a particular node, the results of a query, or any other set of nodes.

 * The set of nodes to be iterated is determined by the implementation

 * of the NodeIterator. DOM Level 2 specifies a single NodeIterator

 * implementation for document-order traversal of a document

 * subtree. Instances of these iterators are created by calling

 * <code>DocumentTraversal.createNodeIterator()</code>.

 *

 */

class DEPRECATED_DOM_EXPORT DOM_NodeIterator

{

    public:

        /** @name Constructors and assignment operator */

        //@{

        /**

          * Default constructor.

          */

        DOM_NodeIterator ();

        /**

          * Copy constructor.

          *

          * @param other The object to be copied.

          */

        DOM_NodeIterator(const DOM_NodeIterator &other);

        /**

          * Assignment operator.

          *

          * @param other The object to be copied.

          */

        DOM_NodeIterator & operator = (const DOM_NodeIterator &other);

        /**

          * Assignment operator.  This overloaded variant is provided for

          *   the sole purpose of setting a DOM_NodeIterator to null.

          *

          * @param val   Only a value of 0, or null, is allowed.

          */

        DOM_NodeIterator & operator = (const DOM_NullPtr *val);

        //@}

        /** @name Destructor. */

        //@{

	/**

	  * Destructor for DOM_NodeIterator.

	  */

        ~DOM_NodeIterator();

        //@}

        /** @name Equality and Inequality operators. */

        //@{

        /**

         * The equality operator.

         *

         * @param other The object reference with which <code>this</code> object is compared

         * @returns True if both <code>DOM_NodeIterator</code>s refer to the same

         *  actual node, or are both null; return false otherwise.

         */

        bool operator == (const DOM_NodeIterator & other)const;

        /**

          *  Compare with a pointer.  Intended only to allow a convenient

          *    comparison with null.

          */

        bool operator == (const DOM_NullPtr *other) const;

        /**

         * The inequality operator.  See operator ==.

         */

        bool operator != (const DOM_NodeIterator & other) const;

         /**

          *  Compare with a pointer.  Intended only to allow a convenient

          *    comparison with null.

          *

          */

        bool operator != (const DOM_NullPtr * other) const;

        //@}

        /** @name Get functions. */

        //@{

        /**

         * The root node of the <code>NodeIterator</code>, as specified when it

         * was created.

         */

        DOM_Node            getRoot();

        /**

          * Return which node types are presented via the iterator.

          * The available set of constants is defined in the DOM_NodeFilter interface.

          *

          */

        unsigned long       getWhatToShow();

        /**

          * Return The filter used to screen nodes.

          *

          */

        DOM_NodeFilter*     getFilter();

        /**

          * Return the expandEntityReferences flag.

          * The value of this flag determines whether the children of entity reference

          * nodes are visible to the DOM_NodeFilter. If false, they will be skipped over.

          *

          */

        bool getExpandEntityReferences();

        /**

          * Returns the next node in the set and advances the position of the iterator

          * in the set. After a DOM_NodeIterator is created, the first call to nextNode()

          * returns the first node in the set.

          *

          * @exception DOMException

          *   INVALID_STATE_ERR: Raised if this method is called after the

          *   <code>detach</code> method was invoked.

          */

        DOM_Node            nextNode();

        /**

          * Returns the previous node in the set and moves the position of the iterator

          * backwards in the set.

          *

          * @exception DOMException

          *   INVALID_STATE_ERR: Raised if this method is called after the

          *   <code>detach</code> method was invoked.

          */

        DOM_Node            previousNode();

        //@}

        /** @name Detaching functions. */

        //@{

        /**

          * Detaches the iterator from the set which it iterated over, releasing any

          * computational resources and placing the iterator in the INVALID state. After

          * <code>detach</code> has been invoked, calls to <code>nextNode</code> or

          * <code>previousNode</code> will raise the exception INVALID_STATE_ERR.

          *

          */

	void				detach();

        //@}

    protected:

        DOM_NodeIterator (NodeIteratorImpl* impl);

        friend class DOM_Document;

    private:

        NodeIteratorImpl*                 fImpl;

};

XERCES_CPP_NAMESPACE_END

#endif