Package org.htmlunit.cyberneko.xerces.dom

Class ParentNode

  • All Implemented Interfaces:
    Cloneable, EventTarget, Node, NodeList
    Direct Known Subclasses:
    CoreDocumentImpl, DocumentFragmentImpl, DocumentTypeImpl, ElementImpl, EntityImpl, EntityReferenceImpl
    public abstract class ParentNode
extends ChildNode
    ParentNode inherits from ChildNode and adds the capability of having child nodes. Not every node in the DOM can have children, so only nodes that can should inherit from this class and pay the price for it.

    ParentNode, just like NodeImpl, also implements NodeList, so it can return itself in response to the getChildNodes() query. This eliminiates the need for a separate ChildNodeList object. Note that this is an IMPLEMENTATION DETAIL; applications should _never_ assume that this identity exists. On the other hand, subclasses may need to override this, in case of conflicting names. This is the case for the classes HTMLSelectElementImpl and HTMLFormElementImpl of the HTML DOM.

    While we have a direct reference to the first child, the last child is stored as the previous sibling of the first child. First child nodes are marked as being so, and getNextSibling hides this fact.

    Note: Not all parent nodes actually need to also be a child. At some point we used to have ParentNode inheriting from NodeImpl and another class called ChildAndParentNode that inherited from ChildNode. But due to the lack of multiple inheritance a lot of code had to be duplicated which led to a maintenance nightmare. At the same time only a few nodes (Document, DocumentFragment, Entity, and Attribute) cannot be a child so the gain in memory wasn't really worth it. The only type for which this would be the case is Attribute, but we deal with there in another special way, so this is not applicable.

    This class doesn't directly support mutation events, however, it notifies the document when mutations are performed so that the document class do so.

    WARNING: Some of the code here is partially duplicated in AttrImpl, be careful to keep these two classes in sync!

    Author:
    Arnaud Le Hors, IBM, Joe Kesselman, IBM, Andy Clark, IBM

    • Field Detail

      • firstChild

        protected ChildNode firstChild
        First child.

      • fNodeListCache

        protected org.htmlunit.cyberneko.xerces.dom.NodeListCache fNodeListCache
        NodeList cache

    • Constructor Detail

      • ParentNode

        protected ParentNode​(CoreDocumentImpl ownerDocument)
        No public constructor; only subclasses of ParentNode should be instantiated, and those normally via a Document's factory methods
        Parameters:
        ownerDocument - the owner document

    • Method Detail

      • getOwnerDocument

        public Document getOwnerDocument()
        Find the Document that this Node belongs to (the document in whose context the Node was created). The Node may or may not currently be part of that Document's actual contents. Find the Document that this Node belongs to (the document in whose context the Node was created). The Node may or may not currently be part of that Document's actual contents.
        Specified by:
        getOwnerDocument in interface Node
        Overrides:
        getOwnerDocument in class NodeImpl

      • hasChildNodes

        public boolean hasChildNodes()
        Test whether this node has any children. Convenience shorthand for (Node.getFirstChild()!=null)

        By default we do not have any children, ParentNode overrides this. Test whether this node has any children. Convenience shorthand for (Node.getFirstChild()!=null)

        Specified by:
        hasChildNodes in interface Node
        Overrides:
        hasChildNodes in class NodeImpl
        See Also:
        ParentNode

      • getChildNodes

        public NodeList getChildNodes()
        Obtain a NodeList enumerating all children of this node. If there are none, an (initially) empty NodeList is returned.

        NodeLists are "live"; as children are added/removed the NodeList will immediately reflect those changes. Also, the NodeList refers to the actual nodes, so changes to those nodes made via the DOM tree will be reflected in the NodeList and vice versa.

        In this implementation, Nodes implement the NodeList interface and provide their own getChildNodes() support. Other DOMs may solve this differently. Obtain a NodeList enumerating all children of this node. If there are none, an (initially) empty NodeList is returned.

        NodeLists are "live"; as children are added/removed the NodeList will immediately reflect those changes. Also, the NodeList refers to the actual nodes, so changes to those nodes made via the DOM tree will be reflected in the NodeList and vice versa.

        In this implementation, Nodes implement the NodeList interface and provide their own getChildNodes() support. Other DOMs may solve this differently.

        Specified by:
        getChildNodes in interface Node
        Overrides:
        getChildNodes in class NodeImpl

      • getFirstChild

        public Node getFirstChild()
        The first child of this Node, or null if none.

        By default we do not have any children, ParentNode overrides this.

        Specified by:
        getFirstChild in interface Node
        Overrides:
        getFirstChild in class NodeImpl
        See Also:
        ParentNode

      • getLastChild

        public Node getLastChild()
        The first child of this Node, or null if none.

        By default we do not have any children, ParentNode overrides this.

        Specified by:
        getLastChild in interface Node
        Overrides:
        getLastChild in class NodeImpl
        See Also:
        ParentNode

      • insertBefore

        public Node insertBefore​(Node newChild,
                         Node refChild)
                  throws DOMException
        Move one or more node(s) to our list of children. Note that this implicitly removes them from their previous parent.

        By default we do not accept any children, ParentNode overrides this. Move one or more node(s) to our list of children. Note that this implicitly removes them from their previous parent.

        Specified by:
        insertBefore in interface Node
        Overrides:
        insertBefore in class NodeImpl
        Parameters:
        newChild - The Node to be moved to our subtree. As a convenience feature, inserting a DocumentNode will instead insert all its children.
        refChild - Current child which newChild should be placed immediately before. If refChild is null, the insertion occurs after all existing Nodes, like appendChild().
        Returns:
        newChild, in its new state (relocated, or emptied in the case of DocumentNode.)
        Throws:
        DOMException - HIERARCHY_REQUEST_ERR if newChild is of a type that shouldn't be a child of this node, or if newChild is an ancestor of this node.
        DOMException - WRONG_DOCUMENT_ERR if newChild has a different owner document than we do.
        DOMException - NOT_FOUND_ERR if refChild is not a child of this node.
        DOMException - NO_MODIFICATION_ALLOWED_ERR if this node is read-only.
        See Also:
        ParentNode

      • removeChild

        public Node removeChild​(Node oldChild)
                 throws DOMException
        Remove a child from this Node. The removed child's subtree remains intact so it may be re-inserted elsewhere.

        By default we do not have any children, ParentNode overrides this. Remove a child from this Node. The removed child's subtree remains intact so it may be re-inserted elsewhere.

        Specified by:
        removeChild in interface Node
        Overrides:
        removeChild in class NodeImpl
        Returns:
        oldChild, in its new state (removed).
        Throws:
        DOMException - NOT_FOUND_ERR if oldChild is not a child of this node.
        DOMException - NO_MODIFICATION_ALLOWED_ERR if this node is read-only.
        See Also:
        ParentNode

      • replaceChild

        public Node replaceChild​(Node newChild,
                         Node oldChild)
                  throws DOMException
        Make newChild occupy the location that oldChild used to have. Note that newChild will first be removed from its previous parent, if any. Equivalent to inserting newChild before oldChild, then removing oldChild.

        By default we do not have any children, ParentNode overrides this. Make newChild occupy the location that oldChild used to have. Note that newChild will first be removed from its previous parent, if any. Equivalent to inserting newChild before oldChild, then removing oldChild.

        Specified by:
        replaceChild in interface Node
        Overrides:
        replaceChild in class NodeImpl
        Returns:
        oldChild, in its new state (removed).
        Throws:
        DOMException - HIERARCHY_REQUEST_ERR if newChild is of a type that shouldn't be a child of this node, or if newChild is one of our ancestors.
        DOMException - WRONG_DOCUMENT_ERR if newChild has a different owner document than we do.
        DOMException - NOT_FOUND_ERR if oldChild is not a child of this node.
        DOMException - NO_MODIFICATION_ALLOWED_ERR if this node is read-only.
        See Also:
        ParentNode

      • getTextContent

        public String getTextContent()
                      throws DOMException
        Description copied from class: NodeImpl
        This attribute returns the text content of this node and its descendants. When it is defined to be null, setting it has no effect. When set, any possible children this node may have are removed and replaced by a single Text node containing the string this attribute is set to. On getting, no serialization is performed, the returned string does not contain any markup. No whitespace normalization is performed, the returned string does not contain the element content whitespaces . Similarly, on setting, no parsing is performed either, the input string is taken as pure textual content.
        The string returned is made of the text content of this node depending on its type, as defined below:
        Node type Content
        ELEMENT_NODE, ENTITY_NODE, ENTITY_REFERENCE_NODE, DOCUMENT_FRAGMENT_NODE concatenation of the textContent attribute value of every child node, excluding COMMENT_NODE and PROCESSING_INSTRUCTION_NODE nodes
        ATTRIBUTE_NODE, TEXT_NODE, CDATA_SECTION_NODE, COMMENT_NODE, PROCESSING_INSTRUCTION_NODE nodeValue
        DOCUMENT_NODE, DOCUMENT_TYPE_NODE, NOTATION_NODE null
        Specified by:
        getTextContent in interface Node
        Overrides:
        getTextContent in class NodeImpl
        Throws:
        DOMException - DOMSTRING_SIZE_ERR: Raised when it would return more characters than fit in a DOMString variable on the implementation platform.

      • setTextContent

        public void setTextContent​(String textContent)
                    throws DOMException
        Description copied from class: NodeImpl
        This attribute returns the text content of this node and its descendants. When it is defined to be null, setting it has no effect. When set, any possible children this node may have are removed and replaced by a single Text node containing the string this attribute is set to. On getting, no serialization is performed, the returned string does not contain any markup. No whitespace normalization is performed, the returned string does not contain the element content whitespaces . Similarly, on setting, no parsing is performed either, the input string is taken as pure textual content.
        The string returned is made of the text content of this node depending on its type, as defined below:
        Node type Content
        ELEMENT_NODE, ENTITY_NODE, ENTITY_REFERENCE_NODE, DOCUMENT_FRAGMENT_NODE concatenation of the textContent attribute value of every child node, excluding COMMENT_NODE and PROCESSING_INSTRUCTION_NODE nodes
        ATTRIBUTE_NODE, TEXT_NODE, CDATA_SECTION_NODE, COMMENT_NODE, PROCESSING_INSTRUCTION_NODE nodeValue
        DOCUMENT_NODE, DOCUMENT_TYPE_NODE, NOTATION_NODE null
        Specified by:
        setTextContent in interface Node
        Overrides:
        setTextContent in class NodeImpl
        Throws:
        DOMException - DOMSTRING_SIZE_ERR: Raised when it would return more characters than fit in a DOMString variable on the implementation platform.

      • getLength

        public int getLength()
        NodeList method: Count the immediate children of this node

        By default we do not have any children, ParentNode overrides this. NodeList method: Count the immediate children of this node

        Specified by:
        getLength in interface NodeList
        Overrides:
        getLength in class NodeImpl
        Returns:
        int

      • item

        public Node item​(int index)
        NodeList method: Return the Nth immediate child of this node, or null if the index is out of bounds.

        By default we do not have any children, ParentNode overrides this. NodeList method: Return the Nth immediate child of this node, or null if the index is out of bounds.

        Specified by:
        item in interface NodeList
        Overrides:
        item in class NodeImpl
        Parameters:
        index - int
        Returns:
        org.w3c.dom.Node

      • getChildNodesUnoptimized

        protected final NodeList getChildNodesUnoptimized()
        Create a NodeList to access children that is use by subclass elements that have methods named getLength() or item(int). ChildAndParentNode optimizes getChildNodes() by implementing NodeList itself. However if a subclass Element implements methods with the same name as the NodeList methods, they will override the actually methods in this class.
        Returns:
        a node list

      • isEqualNode

        public boolean isEqualNode​(Node arg)
        Tests whether two nodes are equal.
        This method tests for equality of nodes, not sameness (i.e., whether the two nodes are references to the same object) which can be tested with Node.isSameNode. All nodes that are the same will also be equal, though the reverse may not be true.
        Two nodes are equal if and only if the following conditions are satisfied: The two nodes are of the same type.The following string attributes are equal: nodeName, localName, namespaceURI, prefix, nodeValue , baseURI. This is: they are both null, or they have the same length and are character for character identical. The attributes NamedNodeMaps are equal. This is: they are both null, or they have the same length and for each node that exists in one map there is a node that exists in the other map and is equal, although not necessarily at the same index.The childNodes NodeLists are equal. This is: they are both null, or they have the same length and contain equal nodes at the same index. This is true for Attr nodes as for any other type of node. Note that normalization can affect equality; to avoid this, nodes should be normalized before being compared.
        For two DocumentType nodes to be equal, the following conditions must also be satisfied: The following string attributes are equal: publicId, systemId, internalSubset.The entities NamedNodeMaps are equal.The notations NamedNodeMaps are equal.
        On the other hand, the following do not affect equality: the ownerDocument attribute, the specified attribute for Attr nodes, the isWhitespaceInElementContent attribute for Text nodes, as well as any user data or event listeners registered on the nodes. DOM Level 3 WD- Experimental. Override inherited behavior from NodeImpl to support deep equal.
        Specified by:
        isEqualNode in interface Node
        Overrides:
        isEqualNode in class NodeImpl
        Parameters:
        arg - The node to compare equality with.
        Returns:
        If the nodes, and possibly subtrees are equal, true otherwise false.

      • synchronizeChildren

        protected void synchronizeChildren()
        Override this method in subclass to hook in efficient internal data structure.