/*
* Copyright 2001-2005 (C) MetaStuff, Ltd. All Rights Reserved.
*
* This software is open source.
* See the bottom of this file for the licence.
*/
package org.dom4j;
import org.dom4j.tree.
AbstractNode;
import org.dom4j.tree.
DefaultNamespace;
import org.dom4j.tree.
NamespaceCache;
/**
* <p>
* <code>Namespace</code> is a Flyweight Namespace that can be shared amongst
* nodes.
* </p>
*
* @author <a href="mailto:jstrachan@apache.org">James Strachan </a>
* @version $Revision: 1.22 $
*/
public class
Namespace extends
AbstractNode {
/** Cache of Namespace instances */
protected static final
NamespaceCache CACHE = new
NamespaceCache();
/** XML Namespace */
public static final
Namespace XML_NAMESPACE =
CACHE.
get("xml",
"http://www.w3.org/XML/1998/namespace");
/** No Namespace present */
public static final
Namespace NO_NAMESPACE =
CACHE.
get("", "");
/** The prefix mapped to this namespace */
private
String prefix;
/** The URI for this namespace */
private
String uri;
/** A cached version of the hashcode for efficiency */
private int
hashCode;
/**
* DOCUMENT ME!
*
* @param prefix
* is the prefix for this namespace
* @param uri
* is the URI for this namespace
*/
public
Namespace(
String prefix,
String uri) {
this.
prefix = (
prefix != null) ?
prefix : "";
this.
uri = (
uri != null) ?
uri : "";
}
/**
* A helper method to return the Namespace instance for the given prefix and
* URI
*
* @param prefix
* DOCUMENT ME!
* @param uri
* DOCUMENT ME!
*
* @return an interned Namespace object
*/
public static
Namespace get(
String prefix,
String uri) {
return
CACHE.
get(
prefix,
uri);
}
/**
* A helper method to return the Namespace instance for no prefix and the
* URI
*
* @param uri
* DOCUMENT ME!
*
* @return an interned Namespace object
*/
public static
Namespace get(
String uri) {
return
CACHE.
get(
uri);
}
public short
getNodeType() {
return
NAMESPACE_NODE;
}
/**
* DOCUMENT ME!
*
* @return the hash code based on the qualified name and the URI of the
* namespace.
*/
public int
hashCode() {
if (
hashCode == 0) {
hashCode =
createHashCode();
}
return
hashCode;
}
/**
* Factory method to create the hashcode allowing derived classes to change
* the behaviour
*
* @return DOCUMENT ME!
*/
protected int
createHashCode() {
int
result =
uri.
hashCode() ^
prefix.
hashCode();
if (
result == 0) {
result = 0xbabe;
}
return
result;
}
/**
* Checks whether this Namespace equals the given Namespace. Two Namespaces
* are equals if their URI and prefix are equal.
*
* @param object
* DOCUMENT ME!
*
* @return DOCUMENT ME!
*/
public boolean
equals(
Object object) {
if (this ==
object) {
return true;
} else if (
object instanceof
Namespace) {
Namespace that = (
Namespace)
object;
// we cache hash codes so this should be quick
if (
hashCode() ==
that.
hashCode()) {
return
uri.
equals(
that.
getURI())
&&
prefix.
equals(
that.
getPrefix());
}
}
return false;
}
public
String getText() {
return
uri;
}
public
String getStringValue() {
return
uri;
}
/**
* DOCUMENT ME!
*
* @return the prefix for this <code>Namespace</code>.
*/
public
String getPrefix() {
return
prefix;
}
/**
* DOCUMENT ME!
*
* @return the URI for this <code>Namespace</code>.
*/
public
String getURI() {
return
uri;
}
public
String getXPathNameStep() {
if ((
prefix != null) && !"".
equals(
prefix)) {
return "namespace::" +
prefix;
}
return "namespace::*[name()='']";
}
public
String getPath(
Element context) {
StringBuffer path = new
StringBuffer(10);
Element parent =
getParent();
if ((
parent != null) && (
parent !=
context)) {
path.
append(
parent.
getPath(
context));
path.
append('/');
}
path.
append(
getXPathNameStep());
return
path.
toString();
}
public
String getUniquePath(
Element context) {
StringBuffer path = new
StringBuffer(10);
Element parent =
getParent();
if ((
parent != null) && (
parent !=
context)) {
path.
append(
parent.
getUniquePath(
context));
path.
append('/');
}
path.
append(
getXPathNameStep());
return
path.
toString();
}
public
String toString() {
return super.toString() + " [Namespace: prefix " +
getPrefix()
+ " mapped to URI \"" +
getURI() + "\"]";
}
public
String asXML() {
StringBuffer asxml = new
StringBuffer(10);
String pref =
getPrefix();
if ((
pref != null) && (
pref.
length() > 0)) {
asxml.
append("xmlns:");
asxml.
append(
pref);
asxml.
append("=\"");
} else {
asxml.
append("xmlns=\"");
}
asxml.
append(
getURI());
asxml.
append("\"");
return
asxml.
toString();
}
public void
accept(
Visitor visitor) {
visitor.
visit(this);
}
protected
Node createXPathResult(
Element parent) {
return new
DefaultNamespace(
parent,
getPrefix(),
getURI());
}
}
/*
* Redistribution and use of this software and associated documentation
* ("Software"), with or without modification, are permitted provided that the
* following conditions are met:
*
* 1. Redistributions of source code must retain copyright statements and
* notices. Redistributions must also contain a copy of this document.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* 3. The name "DOM4J" must not be used to endorse or promote products derived
* from this Software without prior written permission of MetaStuff, Ltd. For
* written permission, please contact dom4j-info@metastuff.com.
*
* 4. Products derived from this Software may not be called "DOM4J" nor may
* "DOM4J" appear in their names without prior written permission of MetaStuff,
* Ltd. DOM4J is a registered trademark of MetaStuff, Ltd.
*
* 5. Due credit should be given to the DOM4J Project - http://www.dom4j.org
*
* THIS SOFTWARE IS PROVIDED BY METASTUFF, LTD. AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL METASTUFF, LTD. OR ITS CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* Copyright 2001-2005 (C) MetaStuff, Ltd. All Rights Reserved.
*/