/*
* 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 groovy.xml;
import java.io.
Serializable;
/**
* <code>QName</code> class represents the value of a qualified name
* as specified in <a href="http://www.w3.org/TR/xmlschema-2/#QName">XML
* Schema Part2: Datatypes specification</a>.
* <p>
* The value of a QName contains a <b>namespaceURI</b>, a <b>localPart</b> and a <b>prefix</b>.
* The localPart provides the local part of the qualified name. The
* namespaceURI is a URI reference identifying the namespace.
*/
public class
QName implements
Serializable {
private static final long
serialVersionUID = -9029109610006696081L;
/** comment/shared empty string */
private static final
String EMPTY_STRING = "";
/** Field namespaceURI */
private
String namespaceURI;
/** Field localPart */
private
String localPart;
/** Field prefix */
private
String prefix;
/**
* Constructor for the QName.
*
* @param localPart Local part of the QName
*/
public
QName(
String localPart) {
this(
EMPTY_STRING,
localPart,
EMPTY_STRING);
}
/**
* 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,
EMPTY_STRING);
}
/**
* 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)
?
EMPTY_STRING
:
namespaceURI;
if (
localPart == null) {
throw new
IllegalArgumentException("invalid QName local part");
} else {
this.
localPart =
localPart;
}
if (
prefix == null) {
throw new
IllegalArgumentException("invalid QName prefix");
} else {
this.
prefix =
prefix;
}
}
/**
* Gets the Namespace URI for this QName
*
* @return Namespace URI
*/
public
String getNamespaceURI() {
return
namespaceURI;
}
/**
* Gets the Local part for this QName
*
* @return Local part
*/
public
String getLocalPart() {
return
localPart;
}
/**
* Gets the Prefix for this QName
*
* @return Prefix
*/
public
String getPrefix() {
return
prefix;
}
/**
* Returns the fully qualified name of this QName
*
* @return a string representation of the QName
*/
public
String getQualifiedName() {
return ((
prefix.
equals(
EMPTY_STRING))
?
localPart
:
prefix + ':' +
localPart);
}
/**
* Returns a string representation of this QName
*
* @return a string representation of the QName
*/
public
String toString() {
return ((
namespaceURI.
equals(
EMPTY_STRING))
?
localPart
: '{' +
namespaceURI + '}' +
localPart);
}
/**
* Tests this QName for equality with another object.
* <p>
* If the given object is not a QName or String equivalent or is null then this method
* returns <tt>false</tt>.
* <p>
* For two QNames to be considered equal requires that both
* localPart and namespaceURI must be equal. This method uses
* <code>String.equals</code> to check equality of localPart
* and namespaceURI. Any class that extends QName is required
* to satisfy this equality contract.
*
* If the supplied object is a String, then it is split in two on the last colon
* and the first half is compared against the prefix || namespaceURI
* and the second half is compared against the localPart
*
* i.e. assert new QName("namespace","localPart").equals("namespace:localPart")
*
* Intended Usage: for gpath accessors, e.g. root.'urn:mynamespace:node'
*
* Warning: this equivalence is not commutative,
* i.e. qname.equals(string) may be true/false but string.equals(qname) is always false
*
* <p>
* This method satisfies the general contract of the <code>Object.equals</code> method.
*
* @param o the reference object with which to compare
*
* @return <code>true</code> if the given object is identical to this
* QName: <code>false</code> otherwise.
*/
public boolean
equals(
Object o) {
if (this ==
o) return true;
if (
o == null) return false;
if (
o instanceof
QName) {
final
QName qName = (
QName)
o;
if (!
namespaceURI.
equals(
qName.
namespaceURI)) return false;
return
localPart.
equals(
qName.
localPart);
} else if (
o instanceof
String) {
final
String string = (
String)
o;
if (
string.
length() == 0) return false;
int
lastColonIndex =
string.
lastIndexOf(":");
if (
lastColonIndex < 0 ||
lastColonIndex ==
string.
length() - 1) return false;
final
String stringPrefix =
string.
substring(0,
lastColonIndex);
final
String stringLocalPart =
string.
substring(
lastColonIndex + 1);
if (
stringPrefix.
equals(
prefix) ||
stringPrefix.
equals(
namespaceURI)) {
return
localPart.
equals(
stringLocalPart);
}
return false;
}
return false;
}
/**
* Tests if this QName matches another object.
* <p>
* If the given object is not a QName or String equivalent or is null then this method
* returns <tt>false</tt>.
* <p>
* For two QNames to be considered matching requires that both
* localPart and namespaceURI must be equal or one of them is a wildcard.
*
* If the supplied object is a String, then it is split in two on the last colon
* and the first half is matched against the prefix || namespaceURI
* and the second half is matched against the localPart
*
* @param o the reference object with which to compare
*
* @return <code>true</code> if the given object matches
* this QName: <code>false</code> otherwise.
*/
public boolean
matches(
Object o) {
if (this ==
o) return true;
if (
o == null) return false;
if (
o instanceof
QName) {
final
QName qName = (
QName)
o;
if (!
namespaceURI.
equals(
qName.
namespaceURI) && !
namespaceURI.
equals("*") && !
qName.
namespaceURI.
equals("*")) return false;
return
localPart.
equals(
qName.
localPart) ||
localPart.
equals("*") ||
qName.
localPart.
equals("*");
} else if (
o instanceof
String) {
final
String string = (
String)
o;
if (
string.
length() == 0) return false;
// try matching against 'prefix:localname'
int
lastColonIndex =
string.
lastIndexOf(":");
if (
lastColonIndex < 0 &&
prefix.
length() == 0) return
string.
equals(
localPart);
if (
lastColonIndex < 0 ||
lastColonIndex ==
string.
length() - 1) return false;
final
String stringPrefix =
string.
substring(0,
lastColonIndex);
final
String stringLocalPart =
string.
substring(
lastColonIndex + 1);
if (
stringPrefix.
equals(
prefix) ||
stringPrefix.
equals(
namespaceURI) ||
stringPrefix.
equals("*")) {
return
localPart.
equals(
stringLocalPart) ||
stringLocalPart.
equals("*");
}
}
return false;
}
/**
* Returns a QName holding the value of the specified String.
* <p>
* The string must be in the form returned by the QName.toString()
* method, i.e. "{namespaceURI}localPart", with the "{namespaceURI}"
* part being optional.
* <p>
* 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
* @throws java.lang.IllegalArgumentException If the specified String cannot be parsed as a QName
* @return QName corresponding to the given String
*/
public static
QName valueOf(
String s) {
if ((
s == null) ||
s.
equals("")) {
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
* <code>Object.hashCode</code> method.
*
* @return a hash code value for this Qname object
*/
public int
hashCode() {
int
result;
result =
namespaceURI.
hashCode();
result = 29 *
result +
localPart.
hashCode();
return
result;
}
}