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/*
* 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.
*/
package org.apache.xerces.dom;
import org.w3c.dom.Node;
/**
* ChildNode inherits from NodeImpl and adds the capability of being a child by
* having references to its previous and next siblings.
*
* @xerces.internal
*
* @version $Id: ChildNode.java 447266 2006-09-18 05:57:49Z mrglavas $
*/
public abstract class ChildNode
extends NodeImpl {
//
// Constants
//
/** Serialization version. */
static final long serialVersionUID = -6112455738802414002L;
//
// Data
//
/** Previous sibling. */
protected ChildNode previousSibling;
/** Next sibling. */
protected ChildNode nextSibling;
//
// Constructors
//
/**
* No public constructor; only subclasses of Node should be
* instantiated, and those normally via a Document's factory methods
*
* Every Node knows what Document it belongs to.
*/
protected ChildNode(CoreDocumentImpl ownerDocument) {
super(ownerDocument);
} // (CoreDocumentImpl)
/** Constructor for serialization. */
public ChildNode() {}
//
// Node methods
//
/**
* Returns a duplicate of a given node. You can consider this a
* generic "copy constructor" for nodes. The newly returned object should
* be completely independent of the source object's subtree, so changes
* in one after the clone has been made will not affect the other.
*
* Note: since we never have any children deep is meaningless here,
* ParentNode overrides this behavior.
* @see ParentNode
*
*
* Example: Cloning a Text node will copy both the node and the text it
* contains.
*
* Example: Cloning something that has children -- Element or Attr, for
* example -- will _not_ clone those children unless a "deep clone"
* has been requested. A shallow clone of an Attr node will yield an
* empty Attr of the same name.
*
* NOTE: Clones will always be read/write, even if the node being cloned
* is read-only, to permit applications using only the DOM API to obtain
* editable copies of locked portions of the tree.
*/
public Node cloneNode(boolean deep) {
ChildNode newnode = (ChildNode) super.cloneNode(deep);
// Need to break the association w/ original kids
newnode.previousSibling = null;
newnode.nextSibling = null;
newnode.isFirstChild(false);
return newnode;
} // cloneNode(boolean):Node
/**
* Returns the parent node of this node
*/
public Node getParentNode() {
// if we have an owner, ownerNode is our parent, otherwise it's
// our ownerDocument and we don't have a parent
return isOwned() ? ownerNode : null;
}
/*
* same as above but returns internal type
*/
final NodeImpl parentNode() {
// if we have an owner, ownerNode is our parent, otherwise it's
// our ownerDocument and we don't have a parent
return isOwned() ? ownerNode : null;
}
/** The next child of this node's parent, or null if none */
public Node getNextSibling() {
return nextSibling;
}
/** The previous child of this node's parent, or null if none */
public Node getPreviousSibling() {
// if we are the firstChild, previousSibling actually refers to our
// parent's lastChild, but we hide that
return isFirstChild() ? null : previousSibling;
}
/*
* same as above but returns internal type
*/
final ChildNode previousSibling() {
// if we are the firstChild, previousSibling actually refers to our
// parent's lastChild, but we hide that
return isFirstChild() ? null : previousSibling;
}
} // class ChildNode