javax.xml.namespace.QName Maven / Gradle / Ivy
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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 javax.xml.namespace;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.Serializable;
/**
* QName class represents the value of a qualified name as specified in XML Schema Part2: Datatypes specification.
*
* The value of a QName contains a namespaceURI, a localPart and a prefix. The
* localPart provides the local part of the qualified name. The namespaceURI is a URI reference
* identifying the namespace.
*
* @version 1.1
*/
public class QName implements Serializable {
private static final long serialVersionUID = -6756054858541526837L;
/** Comment/shared empty String. */
private static final String emptyString = "".intern();
private String namespaceURI;
private String localPart;
private String prefix;
/**
* Constructor for the QName.
*
* @param localPart local part of the QName
*/
public QName(String localPart) {
this(emptyString, localPart, emptyString);
}
/**
* Constructor for the QName.
*
* @param namespaceURI namespace URI for the QName
* @param localPart local part of the QName.
*/
public QName(String namespaceURI, String localPart) {
this(namespaceURI, localPart, emptyString);
}
/**
* Constructor for the QName.
*
* @param namespaceURI Namespace URI for the QName
* @param localPart Local part of the QName.
* @param prefix Prefix of the QName.
*/
public QName(String namespaceURI, String localPart, String prefix) {
this.namespaceURI = (namespaceURI == null)
? emptyString
: namespaceURI.intern();
if (localPart == null) {
throw new IllegalArgumentException("invalid QName local part");
} else {
this.localPart = localPart.intern();
}
if (prefix == null) {
throw new IllegalArgumentException("invalid QName prefix");
} else {
this.prefix = prefix.intern();
}
}
/**
* Gets the namespace URI for this QName.
*
* @return namespace URI
*/
public String getNamespaceURI() {
return namespaceURI;
}
/**
* Gets the local part for this QName.
*
* @return the local part
*/
public String getLocalPart() {
return localPart;
}
/**
* Gets the prefix for this QName.
*
* @return the prefix
*/
public String getPrefix() {
return prefix;
}
/**
* Returns a string representation of this QName.
*
* @return a string representation of the QName
*/
public String toString() {
return ((namespaceURI == emptyString)
? localPart
: '{' + namespaceURI + '}' + localPart);
}
/**
* Tests this QName for equality with another object.
*
* If the given object is not a QName or is null then this method returns false.
*
* For two QNames to be considered equal requires that both localPart and namespaceURI must be
* equal. This method uses String.equals to check equality of localPart and
* namespaceURI. Any class that extends QName is required to satisfy this equality contract.
*
* This method satisfies the general contract of the Object.equals method.
*
* @param obj the reference object with which to compare
* @return true if the given object is identical to this QName: false
* otherwise.
*/
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (!(obj instanceof QName)) {
return false;
}
return (namespaceURI.equals(((QName)obj).namespaceURI))
&& (localPart.equals(((QName)obj).localPart));
}
/**
* Returns a QName holding the value of the specified String.
*
* The string must be in the form returned by the QName.toString() method, i.e.
* "{namespaceURI}localPart", with the "{namespaceURI}" part being optional.
*
* This method doesn't do a full validation of the resulting QName. In particular, it doesn't
* check that the resulting namespace URI is a legal URI (per RFC 2396 and RFC 2732), nor that
* the resulting local part is a legal NCName per the XML Namespaces specification.
*
* @param s the string to be parsed
* @return QName corresponding to the given String
* @throws IllegalArgumentException
* If the specified String cannot be parsed as a QName
*/
public static QName valueOf(String s) {
if ((s == null) || "".equals(s)) {
throw new IllegalArgumentException("invalid QName literal");
}
if (s.charAt(0) == '{') {
int i = s.indexOf('}');
if (i == -1) {
throw new IllegalArgumentException("invalid QName literal");
}
if (i == s.length() - 1) {
throw new IllegalArgumentException("invalid QName literal");
} else {
return new QName(s.substring(1, i), s.substring(i + 1));
}
} else {
return new QName(s);
}
}
/**
* Returns a hash code value for this QName object. The hash code is based on both the localPart
* and namespaceURI parts of the QName. This method satisfies the general contract of the
* Object.hashCode method.
*
* @return a hash code value for this Qname object
*/
public int hashCode() {
return namespaceURI.hashCode() ^ localPart.hashCode();
}
/**
* Ensure that deserialization properly interns the results.
*
* @param in the ObjectInputStream to be read
* @throws IOException if there was a failure in the object input stream
* @throws ClassNotFoundException if the class of any sub-objects could not be found
*/
private void readObject(ObjectInputStream in) throws
IOException, ClassNotFoundException {
in.defaultReadObject();
namespaceURI = namespaceURI.intern();
localPart = localPart.intern();
prefix = prefix.intern();
}
}
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