| /* |
| * reserved comment block |
| * DO NOT REMOVE OR ALTER! |
| */ |
| /* |
| * 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 com.sun.org.apache.xerces.internal.dom; |
| |
| import org.w3c.dom.DocumentFragment; |
| import org.w3c.dom.Node; |
| import org.w3c.dom.Text; |
| |
| /** |
| * DocumentFragment is a "lightweight" or "minimal" Document |
| * object. It is very common to want to be able to extract a portion |
| * of a document's tree or to create a new fragment of a |
| * document. Imagine implementing a user command like cut or |
| * rearranging a document by moving fragments around. It is desirable |
| * to have an object which can hold such fragments and it is quite |
| * natural to use a Node for this purpose. While it is true that a |
| * Document object could fulfil this role, a Document object can |
| * potentially be a heavyweight object, depending on the underlying |
| * implementation... and in DOM Level 1, nodes aren't allowed to cross |
| * Document boundaries anyway. What is really needed for this is a |
| * very lightweight object. DocumentFragment is such an object. |
| * <P> |
| * Furthermore, various operations -- such as inserting nodes as |
| * children of another Node -- may take DocumentFragment objects as |
| * arguments; this results in all the child nodes of the |
| * DocumentFragment being moved to the child list of this node. |
| * <P> |
| * The children of a DocumentFragment node are zero or more nodes |
| * representing the tops of any sub-trees defining the structure of |
| * the document. DocumentFragment do not need to be well-formed XML |
| * documents (although they do need to follow the rules imposed upon |
| * well-formed XML parsed entities, which can have multiple top |
| * nodes). For example, a DocumentFragment might have only one child |
| * and that child node could be a Text node. Such a structure model |
| * represents neither an HTML document nor a well-formed XML document. |
| * <P> |
| * When a DocumentFragment is inserted into a Document (or indeed any |
| * other Node that may take children) the children of the |
| * DocumentFragment and not the DocumentFragment itself are inserted |
| * into the Node. This makes the DocumentFragment very useful when the |
| * user wishes to create nodes that are siblings; the DocumentFragment |
| * acts as the parent of these nodes so that the user can use the |
| * standard methods from the Node interface, such as insertBefore() |
| * and appendChild(). |
| * |
| * @xerces.internal |
| * |
| * @since PR-DOM-Level-1-19980818. |
| */ |
| public class DocumentFragmentImpl |
| extends ParentNode |
| implements DocumentFragment { |
| |
| // |
| // Constants |
| // |
| |
| /** Serialization version. */ |
| static final long serialVersionUID = -7596449967279236746L; |
| |
| // |
| // Constructors |
| // |
| |
| /** Factory constructor. */ |
| public DocumentFragmentImpl(CoreDocumentImpl ownerDoc) { |
| super(ownerDoc); |
| } |
| |
| /** Constructor for serialization. */ |
| public DocumentFragmentImpl() {} |
| |
| // |
| // Node methods |
| // |
| |
| /** |
| * A short integer indicating what type of node this is. The named |
| * constants for this value are defined in the org.w3c.dom.Node interface. |
| */ |
| public short getNodeType() { |
| return Node.DOCUMENT_FRAGMENT_NODE; |
| } |
| |
| /** Returns the node name. */ |
| public String getNodeName() { |
| return "#document-fragment"; |
| } |
| |
| /** |
| * Override default behavior to call normalize() on this Node's |
| * children. It is up to implementors or Node to override normalize() |
| * to take action. |
| */ |
| public void normalize() { |
| // No need to normalize if already normalized. |
| if (isNormalized()) { |
| return; |
| } |
| if (needsSyncChildren()) { |
| synchronizeChildren(); |
| } |
| ChildNode kid, next; |
| |
| for (kid = firstChild; kid != null; kid = next) { |
| next = kid.nextSibling; |
| |
| // If kid is a text node, we need to check for one of two |
| // conditions: |
| // 1) There is an adjacent text node |
| // 2) There is no adjacent text node, but kid is |
| // an empty text node. |
| if ( kid.getNodeType() == Node.TEXT_NODE ) |
| { |
| // If an adjacent text node, merge it with kid |
| if ( next!=null && next.getNodeType() == Node.TEXT_NODE ) |
| { |
| ((Text)kid).appendData(next.getNodeValue()); |
| removeChild( next ); |
| next = kid; // Don't advance; there might be another. |
| } |
| else |
| { |
| // If kid is empty, remove it |
| if ( kid.getNodeValue() == null || kid.getNodeValue().length() == 0 ) { |
| removeChild( kid ); |
| } |
| } |
| } |
| |
| kid.normalize(); |
| } |
| |
| isNormalized(true); |
| } |
| |
| } // class DocumentFragmentImpl |