Java example source code file (NamedNodeMapImpl.java)
The NamedNodeMapImpl.java Java example source code
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/*
* Copyright 1999-2002,2004,2005 The Apache Software Foundation.
*
* Licensed 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.
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package com.sun.org.apache.xerces.internal.dom;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
import java.util.Vector;
import org.w3c.dom.DOMException;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
/**
* NamedNodeMaps represent collections of Nodes that can be accessed
* by name. Entity and Notation nodes are stored in NamedNodeMaps
* attached to the DocumentType. Attributes are placed in a NamedNodeMap
* attached to the elem they're related too. However, because attributes
* require more work, such as firing mutation events, they are stored in
* a subclass of NamedNodeMapImpl.
* <P>
* Only one Node may be stored per name; attempting to
* store another will replace the previous value.
* <P>
* NOTE: The "primary" storage key is taken from the NodeName attribute of the
* node. The "secondary" storage key is the namespaceURI and localName, when
* accessed by DOM level 2 nodes. All nodes, even DOM Level 2 nodes are stored
* in a single Vector sorted by the primary "nodename" key.
* <P>
* NOTE: item()'s integer index does _not_ imply that the named nodes
* must be stored in an array; that's only an access method. Note too
* that these indices are "live"; if someone changes the map's
* contents, the indices associated with nodes may change.
* <P>
*
* @xerces.internal
*
* @version $Id: NamedNodeMapImpl.java,v 1.8 2010-11-01 04:39:39 joehw Exp $
* @since PR-DOM-Level-1-19980818.
*/
public class NamedNodeMapImpl
implements NamedNodeMap, Serializable {
//
// Constants
//
/** Serialization version. */
static final long serialVersionUID = -7039242451046758020L;
//
// Data
//
protected short flags;
protected final static short READONLY = 0x1<<0;
protected final static short CHANGED = 0x1<<1;
protected final static short HASDEFAULTS = 0x1<<2;
/** Nodes. */
protected List nodes;
protected NodeImpl ownerNode; // the node this map belongs to
//
// Constructors
//
/** Constructs a named node map. */
protected NamedNodeMapImpl(NodeImpl ownerNode) {
this.ownerNode = ownerNode;
}
//
// NamedNodeMap methods
//
/**
* Report how many nodes are currently stored in this NamedNodeMap.
* Caveat: This is a count rather than an index, so the
* highest-numbered node at any time can be accessed via
* item(getLength()-1).
*/
public int getLength() {
return (nodes != null) ? nodes.size() : 0;
}
/**
* Retrieve an item from the map by 0-based index.
*
* @param index Which item to retrieve. Note that indices are just an
* enumeration of the current contents; they aren't guaranteed to be
* stable, nor do they imply any promises about the order of the
* NamedNodeMap's contents. In other words, DO NOT assume either that
* index(i) will always refer to the same entry, or that there is any
* stable ordering of entries... and be prepared for double-reporting
* or skips as insertion and deletion occur.
*
* @return the node which currenly has the specified index, or null if index
* is greater than or equal to getLength().
*/
public Node item(int index) {
return (nodes != null && index < nodes.size()) ?
(Node)(nodes.get(index)) : null;
}
/**
* Retrieve a node by name.
*
* @param name Name of a node to look up.
* @return the Node (of unspecified sub-class) stored with that name, or
* null if no value has been assigned to that name.
*/
public Node getNamedItem(String name) {
int i = findNamePoint(name,0);
return (i < 0) ? null : (Node)(nodes.get(i));
} // getNamedItem(String):Node
/**
* Introduced in DOM Level 2. <p>
* Retrieves a node specified by local name and namespace URI.
*
* @param namespaceURI The namespace URI of the node to retrieve.
* When it is null or an empty string, this
* method behaves like getNamedItem.
* @param localName The local name of the node to retrieve.
* @return Node A Node (of any type) with the specified name, or null if the specified
* name did not identify any node in the map.
*/
public Node getNamedItemNS(String namespaceURI, String localName) {
int i = findNamePoint(namespaceURI, localName);
return (i < 0) ? null : (Node)(nodes.get(i));
} // getNamedItemNS(String,String):Node
/**
* Adds a node using its nodeName attribute.
* As the nodeName attribute is used to derive the name which the node must be
* stored under, multiple nodes of certain types (those that have a "special" string
* value) cannot be stored as the names would clash. This is seen as preferable to
* allowing nodes to be aliased.
* @see org.w3c.dom.NamedNodeMap#setNamedItem
* @return If the new Node replaces an existing node the replaced Node is returned,
* otherwise null is returned.
* @param arg
* A node to store in a named node map. The node will later be
* accessible using the value of the namespaceURI and localName
* attribute of the node. If a node with those namespace URI and
* local name is already present in the map, it is replaced by the new
* one.
* @exception org.w3c.dom.DOMException The exception description.
*/
public Node setNamedItem(Node arg)
throws DOMException {
CoreDocumentImpl ownerDocument = ownerNode.ownerDocument();
if (ownerDocument.errorChecking) {
if (isReadOnly()) {
String msg = DOMMessageFormatter.formatMessage(DOMMessageFormatter.DOM_DOMAIN, "NO_MODIFICATION_ALLOWED_ERR", null);
throw new DOMException(DOMException.NO_MODIFICATION_ALLOWED_ERR, msg);
}
if (arg.getOwnerDocument() != ownerDocument) {
String msg = DOMMessageFormatter.formatMessage(DOMMessageFormatter.DOM_DOMAIN, "WRONG_DOCUMENT_ERR", null);
throw new DOMException(DOMException.WRONG_DOCUMENT_ERR, msg);
}
}
int i = findNamePoint(arg.getNodeName(),0);
NodeImpl previous = null;
if (i >= 0) {
previous = (NodeImpl) nodes.get(i);
nodes.set(i, arg);
} else {
i = -1 - i; // Insert point (may be end of list)
if (null == nodes) {
nodes = new ArrayList(5);
}
nodes.add(i, arg);
}
return previous;
} // setNamedItem(Node):Node
/**
* Adds a node using its namespaceURI and localName.
* @see org.w3c.dom.NamedNodeMap#setNamedItem
* @return If the new Node replaces an existing node the replaced Node is returned,
* otherwise null is returned.
* @param arg A node to store in a named node map. The node will later be
* accessible using the value of the namespaceURI and localName
* attribute of the node. If a node with those namespace URI and
* local name is already present in the map, it is replaced by the new
* one.
*/
public Node setNamedItemNS(Node arg)
throws DOMException {
CoreDocumentImpl ownerDocument = ownerNode.ownerDocument();
if (ownerDocument.errorChecking) {
if (isReadOnly()) {
String msg = DOMMessageFormatter.formatMessage(DOMMessageFormatter.DOM_DOMAIN, "NO_MODIFICATION_ALLOWED_ERR", null);
throw new DOMException(DOMException.NO_MODIFICATION_ALLOWED_ERR, msg);
}
if(arg.getOwnerDocument() != ownerDocument) {
String msg = DOMMessageFormatter.formatMessage(DOMMessageFormatter.DOM_DOMAIN, "WRONG_DOCUMENT_ERR", null);
throw new DOMException(DOMException.WRONG_DOCUMENT_ERR, msg);
}
}
int i = findNamePoint(arg.getNamespaceURI(), arg.getLocalName());
NodeImpl previous = null;
if (i >= 0) {
previous = (NodeImpl) nodes.get(i);
nodes.set(i, arg);
} else {
// If we can't find by namespaceURI, localName, then we find by
// nodeName so we know where to insert.
i = findNamePoint(arg.getNodeName(),0);
if (i >= 0) {
previous = (NodeImpl) nodes.get(i);
nodes.add(i, arg);
} else {
i = -1 - i; // Insert point (may be end of list)
if (null == nodes) {
nodes = new ArrayList(5);
}
nodes.add(i, arg);
}
}
return previous;
} // setNamedItemNS(Node):Node
/**
* Removes a node specified by name.
* @param name The name of a node to remove.
* @return The node removed from the map if a node with such a name exists.
*/
/***/
public Node removeNamedItem(String name)
throws DOMException {
if (isReadOnly()) {
String msg = DOMMessageFormatter.formatMessage(DOMMessageFormatter.DOM_DOMAIN, "NO_MODIFICATION_ALLOWED_ERR", null);
throw
new DOMException(DOMException.NO_MODIFICATION_ALLOWED_ERR,
msg);
}
int i = findNamePoint(name,0);
if (i < 0) {
String msg = DOMMessageFormatter.formatMessage(DOMMessageFormatter.DOM_DOMAIN, "NOT_FOUND_ERR", null);
throw new DOMException(DOMException.NOT_FOUND_ERR, msg);
}
NodeImpl n = (NodeImpl)nodes.get(i);
nodes.remove(i);
return n;
} // removeNamedItem(String):Node
/**
* Introduced in DOM Level 2. <p>
* Removes a node specified by local name and namespace URI.
* @param namespaceURI
* The namespace URI of the node to remove.
* When it is null or an empty string, this
* method behaves like removeNamedItem.
* @param name The local name of the node to remove.
* @return Node The node removed from the map if a node with such
* a local name and namespace URI exists.
* @throws NOT_FOUND_ERR: Raised if there is no node named
* name in the map.
*/
public Node removeNamedItemNS(String namespaceURI, String name)
throws DOMException {
if (isReadOnly()) {
String msg = DOMMessageFormatter.formatMessage(DOMMessageFormatter.DOM_DOMAIN, "NO_MODIFICATION_ALLOWED_ERR", null);
throw
new DOMException(DOMException.NO_MODIFICATION_ALLOWED_ERR,
msg);
}
int i = findNamePoint(namespaceURI, name);
if (i < 0) {
String msg = DOMMessageFormatter.formatMessage(DOMMessageFormatter.DOM_DOMAIN, "NOT_FOUND_ERR", null);
throw new DOMException(DOMException.NOT_FOUND_ERR, msg);
}
NodeImpl n = (NodeImpl)nodes.get(i);
nodes.remove(i);
return n;
} // removeNamedItem(String):Node
//
// Public methods
//
/**
* Cloning a NamedNodeMap is a DEEP OPERATION; it always clones
* all the nodes contained in the map.
*/
public NamedNodeMapImpl cloneMap(NodeImpl ownerNode) {
NamedNodeMapImpl newmap = new NamedNodeMapImpl(ownerNode);
newmap.cloneContent(this);
return newmap;
}
protected void cloneContent(NamedNodeMapImpl srcmap) {
List srcnodes = srcmap.nodes;
if (srcnodes != null) {
int size = srcnodes.size();
if (size != 0) {
if (nodes == null) {
nodes = new ArrayList(size);
}
else {
nodes.clear();
}
for (int i = 0; i < size; ++i) {
NodeImpl n = (NodeImpl) srcmap.nodes.get(i);
NodeImpl clone = (NodeImpl) n.cloneNode(true);
clone.isSpecified(n.isSpecified());
nodes.add(clone);
}
}
}
} // cloneMap():NamedNodeMapImpl
//
// Package methods
//
/**
* Internal subroutine to allow read-only Nodes to make their contained
* NamedNodeMaps readonly too. I expect that in fact the shallow
* version of this operation will never be
*
* @param readOnly boolean true to make read-only, false to permit editing.
* @param deep boolean true to pass this request along to the contained
* nodes, false to only toggle the NamedNodeMap itself. I expect that
* the shallow version of this operation will never be used, but I want
* to design it in now, while I'm thinking about it.
*/
void setReadOnly(boolean readOnly, boolean deep) {
isReadOnly(readOnly);
if (deep && nodes != null) {
for (int i = nodes.size() - 1; i >= 0; i--) {
((NodeImpl) nodes.get(i)).setReadOnly(readOnly,deep);
}
}
} // setReadOnly(boolean,boolean)
/**
* Internal subroutine returns this NodeNameMap's (shallow) readOnly value.
*
*/
boolean getReadOnly() {
return isReadOnly();
} // getReadOnly()
//
// Protected methods
//
/**
* NON-DOM
* set the ownerDocument of this node, and the attributes it contains
*/
protected void setOwnerDocument(CoreDocumentImpl doc) {
if (nodes != null) {
final int size = nodes.size();
for (int i = 0; i < size; ++i) {
((NodeImpl)item(i)).setOwnerDocument(doc);
}
}
}
final boolean isReadOnly() {
return (flags & READONLY) != 0;
}
final void isReadOnly(boolean value) {
flags = (short) (value ? flags | READONLY : flags & ~READONLY);
}
final boolean changed() {
return (flags & CHANGED) != 0;
}
final void changed(boolean value) {
flags = (short) (value ? flags | CHANGED : flags & ~CHANGED);
}
final boolean hasDefaults() {
return (flags & HASDEFAULTS) != 0;
}
final void hasDefaults(boolean value) {
flags = (short) (value ? flags | HASDEFAULTS : flags & ~HASDEFAULTS);
}
//
// Private methods
//
/**
* Subroutine: Locate the named item, or the point at which said item
* should be added.
*
* @param name Name of a node to look up.
*
* @return If positive or zero, the index of the found item.
* If negative, index of the appropriate point at which to insert
* the item, encoded as -1-index and hence reconvertable by subtracting
* it from -1. (Encoding because I don't want to recompare the strings
* but don't want to burn bytes on a datatype to hold a flagged value.)
*/
protected int findNamePoint(String name, int start) {
// Binary search
int i = 0;
if (nodes != null) {
int first = start;
int last = nodes.size() - 1;
while (first <= last) {
i = (first + last) / 2;
int test = name.compareTo(((Node)(nodes.get(i))).getNodeName());
if (test == 0) {
return i; // Name found
}
else if (test < 0) {
last = i - 1;
}
else {
first = i + 1;
}
}
if (first > i) {
i = first;
}
}
return -1 - i; // not-found has to be encoded.
} // findNamePoint(String):int
/** This findNamePoint is for DOM Level 2 Namespaces.
*/
protected int findNamePoint(String namespaceURI, String name) {
if (nodes == null) return -1;
if (name == null) return -1;
// This is a linear search through the same nodes ArrayList.
// The ArrayList is sorted on the DOM Level 1 nodename.
// The DOM Level 2 NS keys are namespaceURI and Localname,
// so we must linear search thru it.
// In addition, to get this to work with nodes without any namespace
// (namespaceURI and localNames are both null) we then use the nodeName
// as a secondary key.
final int size = nodes.size();
for (int i = 0; i < size; ++i) {
NodeImpl a = (NodeImpl)nodes.get(i);
String aNamespaceURI = a.getNamespaceURI();
String aLocalName = a.getLocalName();
if (namespaceURI == null) {
if (aNamespaceURI == null
&&
(name.equals(aLocalName)
||
(aLocalName == null && name.equals(a.getNodeName()))))
return i;
} else {
if (namespaceURI.equals(aNamespaceURI)
&&
name.equals(aLocalName))
return i;
}
}
return -1;
}
// compare 2 nodes in the map. If a precedes b, return true, otherwise
// return false
protected boolean precedes(Node a, Node b) {
if (nodes != null) {
final int size = nodes.size();
for (int i = 0; i < size; ++i) {
Node n = (Node)nodes.get(i);
if (n==a) return true;
if (n==b) return false;
}
}
return false;
}
/**
* NON-DOM: Remove attribute at specified index
*/
protected void removeItem(int index) {
if (nodes != null && index < nodes.size()){
nodes.remove(index);
}
}
protected Object getItem (int index){
if (nodes != null) {
return nodes.get(index);
}
return null;
}
protected int addItem (Node arg) {
int i = findNamePoint(arg.getNamespaceURI(), arg.getLocalName());
if (i >= 0) {
nodes.set(i, arg);
}
else {
// If we can't find by namespaceURI, localName, then we find by
// nodeName so we know where to insert.
i = findNamePoint(arg.getNodeName(),0);
if (i >= 0) {
nodes.add(i, arg);
}
else {
i = -1 - i; // Insert point (may be end of list)
if (null == nodes) {
nodes = new ArrayList(5);
}
nodes.add(i, arg);
}
}
return i;
}
/**
* NON-DOM: copy content of this map into the specified ArrayList
*
* @param list ArrayList to copy information into.
* @return A copy of this node named map
*/
protected ArrayList cloneMap(ArrayList list) {
if (list == null) {
list = new ArrayList(5);
}
list.clear();
if (nodes != null) {
final int size = nodes.size();
for (int i = 0; i < size; ++i) {
list.add(nodes.get(i));
}
}
return list;
}
protected int getNamedItemIndex(String namespaceURI, String localName) {
return findNamePoint(namespaceURI, localName);
}
/**
* NON-DOM remove all elements from this map
*/
public void removeAll (){
if (nodes != null) {
nodes.clear();
}
}
private void readObject(ObjectInputStream in)
throws IOException, ClassNotFoundException {
in.defaultReadObject();
if (nodes != null) {
nodes = new ArrayList(nodes);
}
}
private void writeObject(ObjectOutputStream out) throws IOException {
List oldNodes = this.nodes;
try {
if (oldNodes != null) {
this.nodes = new Vector(oldNodes);
}
out.defaultWriteObject();
}
// If the write fails for some reason ensure
// that we restore the original object.
finally {
this.nodes = oldNodes;
}
}
} // class NamedNodeMapImpl
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