/*
 * The Apache Software License, Version 1.1
 * 
 * Copyright (c) 1999 The Apache Software Foundation.  All rights 
 * reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 * 
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:  
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 * 
 * 4. The names "Xerces" and "Apache Software Foundation" must
 *    not be used to endorse or promote products derived from this
 *    software without prior written permission. For written 
 *    permission, please contact apache\@apache.org.
 * 
 * 5. Products derived from this software may not be called "Apache",
 *    nor may "Apache" appear in their name, without prior written
 *    permission of the Apache Software Foundation.
 * 
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 * 
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation, and was
 * originally based on software copyright (c) 1999, International
 * Business Machines, Inc., http://www.ibm.com .  For more information
 * on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */

/**
 * $Log$
 * Revision 1.1  1999/11/09 01:08:49  twl
 * Initial revision
 *
 * Revision 1.2  1999/11/08 20:44:13  rahul
 * Swat for adding in Product name and CVS comment log variable.
 *
 */

#ifndef DOM_CharacterData_HEADER_GUARD_
#define DOM_CharacterData_HEADER_GUARD_

#include <util/XML4CDefs.hpp>
#include <dom/DOM_Node.hpp>

class CharacterDataImpl;

/**
 * The <code>DOM_CharacterData</code> interface extends Node with a set  of 
 * methods for accessing character data in the DOM.
 *
 * For clarity this set is defined here rather than on each class that uses 
 * these methods. No DOM objects correspond directly to 
 * <code>CharacterData</code>, though <code>Text</code> and others do inherit 
 * the interface from it. All <code>offset</code>s in this interface start 
 * from 0, and index in terms of Unicode 16 bit storage units.
 */
class CDOM_EXPORT DOM_CharacterData: public DOM_Node {

private:

public:
  /** @name Constructors and assignment operator */
  //@{
  /**
    * Default constructor for DOM_CharacterData.  While there can be
    * no actual DOM nodes of type CharacterData, the C++ objects
    * function more like reference variables, and instances of
    * <code>DOM_CharacterData</code> can exist.  They will be null when created
    * by this constructor, and can then be assigned to refer to Text
    * or CDATASection nodes.
    */
    DOM_CharacterData();

  /**
    * Copy constructor
    *
    * @param other The object to be copied
    */
    DOM_CharacterData(const DOM_CharacterData &other);
  /**
    * Assignment operator
    *
    * @param other The object to be copied
    */
    DOM_CharacterData & operator = (const DOM_CharacterData &other);

    //@}
    /** @name Destructor. */
    //@{
	 /**
	  * Destructor for DOM_CharacterData.  The object being destroyed
      * is the reference to the Character Data node, not the character
      * data itself.
	  */
    ~DOM_CharacterData();

    /**
      * Assignment operator.  This overloaded variant is provided for
      *   the sole purpose of setting a DOM_Node reference variable to
      *   zero.  Nulling out a reference variable in this way will decrement
      *   the reference count on the underlying Node object that the variable
      *   formerly referenced.  This effect is normally obtained when reference
      *   variable goes out of scope, but zeroing them can be useful for
      *   global instances, or for local instances that will remain in scope
      *   for an extended time,  when the storage belonging to the underlying
      *   node needs to be reclaimed.
      *
      * @param val.  Only a value of 0, or null, is allowed.
      */
    DOM_CharacterData & operator = (const DOM_NullPtr *val);


    //@}

    /** @name Getter functions. */
    //@{
  /**
   * Returns the character data of the node that implements this interface. 
   *
   * The DOM implementation may not put arbitrary limits on the amount of data that 
   * may be stored in a  <code>CharacterData</code> node. However, 
   * implementation limits may  mean that the entirety of a node's data may 
   * not fit into a single <code>DOMString</code>. In such cases, the user 
   * may call <code>substringData</code> to retrieve the data in 
   * appropriately sized pieces.
   * @exception DOMException
   *   NO_MODIFICATION_ALLOWED_ERR: Raised when the node is readonly.
   * @exception DOMException
   *   DOMSTRING_SIZE_ERR: Raised when it would return more characters than 
   *   fit in a <code>DOMString</code> variable on the implementation 
   *   platform.
   */
  DOMString          getData() const;
  /**
   * Returns the number of characters that are available through <code>data</code> and 
   * the <code>substringData</code> method below. 
   *
   * This may have the value 
   * zero, i.e., <code>CharacterData</code> nodes may be empty.
   */
  int                getLength() const;
  /**
   * Extracts a range of data from the node.
   *
   * @param offset Start offset of substring to extract.
   * @param count The number of characters to extract.
   * @return The specified substring. If the sum of <code>offset</code> and 
   *   <code>count</code> exceeds the <code>length</code>, then all 
   *   characters to the end of the data are returned.
   * @exception DOMException
   *   INDEX_SIZE_ERR: Raised if the specified offset is negative or greater 
   *   than the number of characters in <code>data</code>, or if the 
   *   specified <code>count</code> is negative.
   *   <br>DOMSTRING_SIZE_ERR: Raised if the specified range of text does not 
   *   fit into a <code>DOMString</code>.
   */
  DOMString          substringData(int offset, 
                                   int count) const;
    //@}
    /** @name Functions that set or change data. */
    //@{
  /**
   * Append the string to the end of the character data of the node.
   *
   * Upon success, <code>data</code> provides access to the concatenation of 
   * <code>data</code> and the <code>DOMString</code> specified.
   * @param arg The <code>DOMString</code> to append.
   * @exception DOMException
   *   NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
   */
  void               appendData(const DOMString &arg);
  /**
   * Insert a string at the specified character offset.
   *
   * @param offset The character offset at which to insert.
   * @param arg The <code>DOMString</code> to insert.
   * @exception DOMException
   *   INDEX_SIZE_ERR: Raised if the specified offset is negative or greater 
   *   than the number of characters in <code>data</code>.
   *   <br>NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
   */
  void               insertData(int offset, const  DOMString &arg);
  /**
   * Remove a range of characters from the node. 
   *
   * Upon success, 
   * <code>data</code> and <code>length</code> reflect the change.
   * @param offset The offset from which to remove characters.
   * @param count The number of characters to delete. If the sum of 
   *   <code>offset</code> and <code>count</code> exceeds <code>length</code> 
   *   then all characters from <code>offset</code> to the end of the data 
   *   are deleted.
   * @exception DOMException
   *   INDEX_SIZE_ERR: Raised if the specified offset is negative or greater 
   *   than the number of characters in <code>data</code>, or if the 
   *   specified <code>count</code> is negative.
   *   <br>NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
   */
  void               deleteData(int offset, 
                                       int count);
  /**
   * Replace the characters starting at the specified character offset with 
   * the specified string.
   *
   * @param offset The offset from which to start replacing.
   * @param count The number of characters to replace. If the sum of 
   *   <code>offset</code> and <code>count</code> exceeds <code>length</code>
   *   , then all characters to the end of the data are replaced (i.e., the 
   *   effect is the same as a <code>remove</code> method call with the same 
   *   range, followed by an <code>append</code> method invocation).
   * @param arg The <code>DOMString</code> with which the range must be 
   *   replaced.
   * @exception DOMException
   *   INDEX_SIZE_ERR: Raised if the specified offset is negative or greater 
   *   than the number of characters in <code>data</code>, or if the 
   *   specified <code>count</code> is negative.
   *   <br>NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly.
   */
  void               replaceData(int offset, 
                                 int count, 
                                 const DOMString &arg);

  /**
   * Sets the character data of the node that implements this interface. 
   *
   * @param data The <code>DOMString</code> to set.
   */
  void               setData(const DOMString &data);
  //@}

protected:
    DOM_CharacterData(CharacterDataImpl *impl);

};

#endif