node.java

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/*
 * Copyright (c) 2000 World Wide Web Consortium,
 * (Massachusetts Institute of Technology, Institut National de
 * Recherche en Informatique et en Automatique, Keio University). All
 * Rights Reserved. This program is distributed under the W3C's Software
 * Intellectual Property License. This program is distributed in the
 * hope that it will be useful, but WITHOUT ANY WARRANTY; without even
 * the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
 * PURPOSE.
 * See W3C License http://www.w3.org/Consortium/Legal/ for more details.
 */

package org.w3c.dom;

/**
 * The <code>Node</code> interface is the primary datatype for the entire 
 * Document Object Model. It represents a single node in the document tree. 
 * While all objects implementing the <code>Node</code> interface expose 
 * methods for dealing with children, not all objects implementing the 
 * <code>Node</code> interface may have children. For example, 
 * <code>Text</code> nodes may not have children, and adding children to 
 * such nodes results in a <code>DOMException</code> being raised.
 * <p>The attributes <code>nodeName</code>, <code>nodeValue</code> and 
 * <code>attributes</code> are included as a mechanism to get at node 
 * information without casting down to the specific derived interface. In 
 * cases where there is no obvious mapping of these attributes for a 
 * specific <code>nodeType</code> (e.g., <code>nodeValue</code> for an 
 * <code>Element</code> or <code>attributes</code> for a <code>Comment</code>
 * ), this returns <code>null</code>. Note that the specialized interfaces 
 * may contain additional and more convenient mechanisms to get and set the 
 * relevant information.
 * <p>See also the <a href='http://www.w3.org/TR/2000/REC-DOM-Level-2-Core-20001113'>Document Object Model (DOM) Level 2 Core Specification</a>.
 */
public interface Node {
    // NodeType
    /**
     * The node is an <code>Element</code>.
     */
    public static final short ELEMENT_NODE              = 1;
    /**
     * The node is an <code>Attr</code>.
     */
    public static final short ATTRIBUTE_NODE            = 2;
    /**
     * The node is a <code>Text</code> node.
     */
    public static final short TEXT_NODE                 = 3;
    /**
     * The node is a <code>CDATASection</code>.
     */
    public static final short CDATA_SECTION_NODE        = 4;
    /**
     * The node is an <code>EntityReference</code>.
     */
    public static final short ENTITY_REFERENCE_NODE     = 5;
    /**
     * The node is an <code>Entity</code>.
     */
    public static final short ENTITY_NODE               = 6;
    /**
     * The node is a <code>ProcessingInstruction</code>.
     */
    public static final short PROCESSING_INSTRUCTION_NODE = 7;
    /**
     * The node is a <code>Comment</code>.
     */
    public static final short COMMENT_NODE              = 8;
    /**
     * The node is a <code>Document</code>.
     */
    public static final short DOCUMENT_NODE             = 9;
    /**
     * The node is a <code>DocumentType</code>.
     */
    public static final short DOCUMENT_TYPE_NODE        = 10;
    /**
     * The node is a <code>DocumentFragment</code>.
     */
    public static final short DOCUMENT_FRAGMENT_NODE    = 11;
    /**
     * The node is a <code>Notation</code>.
     */
    public static final short NOTATION_NODE             = 12;

    /**
     * The name of this node, depending on its type; see the table above. 
     */
    public String getNodeName();

    /**
     * The value of this node, depending on its type; see the table above. 
     * When it is defined to be <code>null</code>, setting it has no effect.
     * @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.
     */
    public String getNodeValue()
                                 throws DOMException;
    public void setNodeValue(String nodeValue)
                                 throws DOMException;

    /**
     * A code representing the type of the underlying object, as defined above.
     */
    public short getNodeType();

    /**
     * The parent of this node. All nodes, except <code>Attr</code>, 
     * <code>Document</code>, <code>DocumentFragment</code>, 
     * <code>Entity</code>, and <code>Notation</code> may have a parent. 
     * However, if a node has just been created and not yet added to the 
     * tree, or if it has been removed from the tree, this is 
     * <code>null</code>.
     */
    public Node getParentNode();

    /**
     * A <code>NodeList</code> that contains all children of this node. If 
     * there are no children, this is a <code>NodeList</code> containing no 
     * nodes.
     */
    public NodeList getChildNodes();

    /**
     * The first child of this node. If there is no such node, this returns 
     * <code>null</code>.
     */
    public Node getFirstChild();

    /**
     * The last child of this node. If there is no such node, this returns 
     * <code>null</code>.
     */
    public Node getLastChild();

    /**
     * The node immediately preceding this node. If there is no such node, 
     * this returns <code>null</code>.
     */
    public Node getPreviousSibling();

    /**
     * The node immediately following this node. If there is no such node, 
     * this returns <code>null</code>.
     */
    public Node getNextSibling();

    /**
     * A <code>NamedNodeMap</code> containing the attributes of this node (if 
     * it is an <code>Element</code>) or <code>null</code> otherwise. 
     */
    public NamedNodeMap getAttributes();

    /**
     * The <code>Document</code> object associated with this node. This is 
     * also the <code>Document</code> object used to create new nodes. When 
     * this node is a <code>Document</code> or a <code>DocumentType</code> 
     * which is not used with any <code>Document</code> yet, this is 
     * <code>null</code>.
     * @version DOM Level 2
     */
    public Document getOwnerDocument();

    /**
     * Inserts the node <code>newChild</code> before the existing child node 
     * <code>refChild</code>. If <code>refChild</code> is <code>null</code>, 
     * insert <code>newChild</code> at the end of the list of children.
     * <br>If <code>newChild</code> is a <code>DocumentFragment</code> object, 
     * all of its children are inserted, in the same order, before 
     * <code>refChild</code>. If the <code>newChild</code> is already in the 
     * tree, it is first removed.
     * @param newChildThe node to insert.
     * @param refChildThe reference node, i.e., the node before which the new 
     *   node must be inserted.
     * @return The node being inserted.
     * @exception DOMException
     *   HIERARCHY_REQUEST_ERR: Raised if this node is of a type that does not 
     *   allow children of the type of the <code>newChild</code> node, or if 
     *   the node to insert is one of this node's ancestors.
     *   <br>WRONG_DOCUMENT_ERR: Raised if <code>newChild</code> was created 
     *   from a different document than the one that created this node.
     *   <br>NO_MODIFICATION_ALLOWED_ERR: Raised if this node is readonly or 
     *   if the parent of the node being inserted is readonly.
     *   <br>NOT_FOUND_ERR: Raised if <code>refChild</code> is not a child of 
     *   this node.
     */
    public Node insertBefore(Node newChild, 
                             Node refChild)
                             throws DOMException;

    /**
     * Replaces the child node <code>oldChild</code> with <code>newChild</code>
     *  in the list of children, and returns the <code>oldChild</code> node.