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 { /** comment/shared empty string */ private static final String emptyString = "".intern(); /** 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(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 Local part */ public String getLocalPart() { return localPart; } /** * Gets the Prefix for this QName * * @return 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 final boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (!(obj instanceof QName)) {
return false;
}
if ((namespaceURI == ((QName) obj).namespaceURI)
&& (localPart == ((QName) obj).localPart)) {
return true;
}
return false;
}
/**
* 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
* @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
* Object.hashCode method.
*
* @return a hash code value for this Qname object
*/
public final int hashCode() {
return namespaceURI.hashCode() ^ localPart.hashCode();
}
/**
* Ensure that deserialization properly interns the results.
* @param in the ObjectInputStream to be read
*/
private void readObject(ObjectInputStream in) throws
IOException, ClassNotFoundException {
in.defaultReadObject();
namespaceURI = namespaceURI.intern();
localPart = localPart.intern();
prefix = prefix.intern();
}
}