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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.
*/
/* $Id$ */
package org.apache.fop.util;
import java.io.Serializable;
/**
* Represents a qualified name of an XML element or an XML attribute.
* <p>
* Note: This class allows to carry a namespace prefix but it is not used in the equals() and
* hashCode() methods.
*/
public class QName implements Serializable {
private static final long serialVersionUID = -5225376740044770690L;
private String namespaceURI;
private String localName;
private String prefix;
private int hashCode;
/**
* Main constructor.
* @param namespaceURI the namespace URI
* @param prefix the namespace prefix, may be null
* @param localName the local name
*/
public QName(String namespaceURI, String prefix, String localName) {
if (localName == null) {
throw new NullPointerException("Parameter localName must not be null");
}
if (localName.length() == 0) {
throw new IllegalArgumentException("Parameter localName must not be empty");
}
this.namespaceURI = namespaceURI;
this.prefix = prefix;
this.localName = localName;
this.hashCode = toHashString().hashCode();
}
/**
* Main constructor.
* @param namespaceURI the namespace URI
* @param qName the qualified name
*/
public QName(String namespaceURI, String qName) {
if (qName == null) {
throw new NullPointerException("Parameter localName must not be null");
}
if (qName.length() == 0) {
throw new IllegalArgumentException("Parameter localName must not be empty");
}
this.namespaceURI = namespaceURI;
int p = qName.indexOf(':');
if (p > 0) {
this.prefix = qName.substring(0, p);
this.localName = qName.substring(p + 1);
} else {
this.prefix = null;
this.localName = qName;
}
this.hashCode = toHashString().hashCode();
}
/** @return the namespace URI */
public String getNamespaceURI() {
return this.namespaceURI;
}
/** @return the namespace prefix */
public String getPrefix() {
return this.prefix;
}
/** @return the local name */
public String getLocalName() {
return this.localName;
}
/** @return the fully qualified name */
public String getQName() {
return getPrefix() != null ? getPrefix() + ':' + getLocalName() : getLocalName();
}
/** @see java.lang.Object#hashCode() */
public int hashCode() {
return this.hashCode;
}
/** @see java.lang.Object#equals(java.lang.Object) */
public boolean equals(Object obj) {
if (obj == null) {
return false;
} else if (obj == this) {
return true;
} else {
if (obj instanceof QName) {
QName other = (QName)obj;
if ((getNamespaceURI() == null && other.getNamespaceURI() == null)
|| getNamespaceURI().equals(other.getNamespaceURI())) {
return getLocalName().equals(other.getLocalName());
}
}
}
return false;
}
/** @see java.lang.Object#toString() */
public String toString() {
return prefix != null
? (prefix + ":" + localName)
: toHashString();
}
private String toHashString() {
return (namespaceURI != null
? ("{" + namespaceURI + "}" + localName)
: localName);
}
}
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