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Java Source Code / Java Documentation » 6.0 JDK Core » xml » javax.xml.namespace 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   javax.xml.namespace.QName

QName
public class QName implements Serializable(Code)

QName represents a qualified name as defined in the XML specifications: XML Schema Part2: Datatypes specification, Namespaces in XML, Namespaces in XML Errata.

The value of a QName contains a Namespace URI, local part and prefix.

The prefix is included in QName to retain lexical information when present in an javax.xml.transform.Source XML input source . The prefix is NOT used in QName.equals(Object)QName.equals(Object) or to compute the QName.hashCode()QName.hashCode() . Equality and the hash code are defined using only the Namespace URI and local part.

If not specified, the Namespace URI is set to javax.xml.XMLConstants.NULL_NS_URI XMLConstants.NULL_NS_URI . If not specified, the prefix is set to javax.xml.XMLConstants.DEFAULT_NS_PREFIXXMLConstants.DEFAULT_NS_PREFIX .

QName is immutable.


author:
   Jeff Suttor
version:
   $Revision: 1.5 $, $Date: 2005/11/03 19:34:20 $
See Also:    * XML Schema Part2: Datatypes specification
See Also:    * Namespaces in XML
See Also:    * Namespaces in XML Errata
since:
   1.5



Constructor Summary
public  QName(String namespaceURI, String localPart)
    

QName constructor specifying the Namespace URI and local part.

If the Namespace URI is null, it is set to javax.xml.XMLConstants.NULL_NS_URIXMLConstants.NULL_NS_URI .

public  QName(String namespaceURI, String localPart, String prefix)
    

QName constructor specifying the Namespace URI, local part and prefix.

If the Namespace URI is null, it is set to javax.xml.XMLConstants.NULL_NS_URIXMLConstants.NULL_NS_URI .

public  QName(String localPart)
    

QName constructor specifying the local part.

If the local part is null an IllegalArgumentException is thrown. A local part of "" is allowed to preserve compatible behavior with QName 1.0.


Method Summary
final public  booleanequals(Object objectToTest)
    

Test this QName for equality with another Object.

If the Object to be tested is not a QName or is null, then this method returns false.

Two QNames are considered equal if and only if both the Namespace URI and local part are equal.

public  StringgetLocalPart()
    
public  StringgetNamespaceURI()
    
public  StringgetPrefix()
    

Get the prefix of this QName.

The prefix assigned to a QName might NOT be valid in a different context.

final public  inthashCode()
    

Generate the hash code for this QName.

The hash code is calculated using both the Namespace URI and the local part of the QName.

public  StringtoString()
    

String representation of this QName.

The commonly accepted way of representing a QName as a String was defined by James Clark.

public static  QNamevalueOf(String qNameAsString)
    

QName derived from parsing the formatted String.

If the String is null or does not conform to QName.toString() QName.toString() formatting, an IllegalArgumentException is thrown.

The String MUST be in the form returned by QName.toString() QName.toString() .

The commonly accepted way of representing a QName as a String was defined by James Clark.



Constructor Detail
QName
public QName(String namespaceURI, String localPart)(Code)

QName constructor specifying the Namespace URI and local part.

If the Namespace URI is null, it is set to javax.xml.XMLConstants.NULL_NS_URIXMLConstants.NULL_NS_URI . This value represents no explicitly defined Namespace as defined by the Namespaces in XML specification. This action preserves compatible behavior with QName 1.0. Explicitly providing the javax.xml.XMLConstants.NULL_NS_URIXMLConstants.NULL_NS_URI value is the preferred coding style.

If the local part is null an IllegalArgumentException is thrown. A local part of "" is allowed to preserve compatible behavior with QName 1.0.

When using this constructor, the prefix is set to javax.xml.XMLConstants.DEFAULT_NS_PREFIXXMLConstants.DEFAULT_NS_PREFIX .

The Namespace URI is not validated as a URI reference. The local part is not validated as a NCName as specified in Namespaces in XML.


Parameters:
  namespaceURI - Namespace URI of the QName
Parameters:
  localPart - local part of the QName
throws:
  IllegalArgumentException - When localPart isnull
See Also:   QName.QName(String namespaceURI,String localPart,String prefix)
See Also:    QName(String namespaceURI, String localPart, String
See Also:   prefix)



QName
public QName(String namespaceURI, String localPart, String prefix)(Code)

QName constructor specifying the Namespace URI, local part and prefix.

If the Namespace URI is null, it is set to javax.xml.XMLConstants.NULL_NS_URIXMLConstants.NULL_NS_URI . This value represents no explicitly defined Namespace as defined by the Namespaces in XML specification. This action preserves compatible behavior with QName 1.0. Explicitly providing the javax.xml.XMLConstants.NULL_NS_URIXMLConstants.NULL_NS_URI value is the preferred coding style.

If the local part is null an IllegalArgumentException is thrown. A local part of "" is allowed to preserve compatible behavior with QName 1.0.

If the prefix is null, an IllegalArgumentException is thrown. Use javax.xml.XMLConstants.DEFAULT_NS_PREFIXXMLConstants.DEFAULT_NS_PREFIX to explicitly indicate that no prefix is present or the prefix is not relevant.

The Namespace URI is not validated as a URI reference. The local part and prefix are not validated as a NCName as specified in Namespaces in XML.


Parameters:
  namespaceURI - Namespace URI of the QName
Parameters:
  localPart - local part of the QName
Parameters:
  prefix - prefix of the QName
throws:
  IllegalArgumentException - When localPartor prefix is null



QName
public QName(String localPart)(Code)

QName constructor specifying the local part.

If the local part is null an IllegalArgumentException is thrown. A local part of "" is allowed to preserve compatible behavior with QName 1.0.

When using this constructor, the Namespace URI is set to javax.xml.XMLConstants.NULL_NS_URIXMLConstants.NULL_NS_URI and the prefix is set to javax.xml.XMLConstants.DEFAULT_NS_PREFIXXMLConstants.DEFAULT_NS_PREFIX .

In an XML context, all Element and Attribute names exist in the context of a Namespace. Making this explicit during the construction of a QName helps prevent hard to diagnosis XML validity errors. The constructors QName.QName(String namespaceURI,String localPart) QName(StringnamespaceURI, String localPart) and QName.QName(String namespaceURI,String localPart,String prefix) are preferred.

The local part is not validated as a NCName as specified in Namespaces in XML.


Parameters:
  localPart - local part of the QName
throws:
  IllegalArgumentException - When localPart isnull
See Also:   QName.QName(String namespaceURI,String localPart)
See Also:    QName(String
See Also:   namespaceURI, String localPart)
See Also:   QName.QName(String namespaceURI,String localPart,String prefix)
See Also:    QName(String namespaceURI, String localPart, String
See Also:   prefix)




Method Detail
equals
final public boolean equals(Object objectToTest)(Code)

Test this QName for equality with another Object.

If the Object to be tested is not a QName or is null, then this method returns false.

Two QNames are considered equal if and only if both the Namespace URI and local part are equal. This method uses String.equals() to check equality of the Namespace URI and local part. The prefix is NOT used to determine equality.

This method satisfies the general contract of java.lang.Object.equals(Object) Object.equals(Object)


Parameters:
  objectToTest - the Object to test forequality with this QName true if the given Object isequal to this QName else false



getLocalPart
public String getLocalPart()(Code)

Get the local part of this QName.

local part of this QName



getNamespaceURI
public String getNamespaceURI()(Code)

Get the Namespace URI of this QName.

Namespace URI of this QName



getPrefix
public String getPrefix()(Code)

Get the prefix of this QName.

The prefix assigned to a QName might NOT be valid in a different context. For example, a QName may be assigned a prefix in the context of parsing a document but that prefix may be invalid in the context of a different document.

prefix of this QName



hashCode
final public int hashCode()(Code)

Generate the hash code for this QName.

The hash code is calculated using both the Namespace URI and the local part of the QName. The prefix is NOT used to calculate the hash code.

This method satisfies the general contract of java.lang.Object.hashCode Object.hashCode() .

hash code for this QName Object



toString
public String toString()(Code)

String representation of this QName.

The commonly accepted way of representing a QName as a String was defined by James Clark. Although this is not a standard specification, it is in common use, e.g. javax.xml.transform.Transformer.setParameter(String nameObject value) . This implementation represents a QName as: "{" + Namespace URI + "}" + local part. If the Namespace URI .equals(XMLConstants.NULL_NS_URI), only the local part is returned. An appropriate use of this method is for debugging or logging for human consumption.

Note the prefix value is NOT returned as part of the String representation.

This method satisfies the general contract of java.lang.Object.toString Object.toString() .

String representation of this QName



valueOf
public static QName valueOf(String qNameAsString)(Code)

QName derived from parsing the formatted String.

If the String is null or does not conform to QName.toString() QName.toString() formatting, an IllegalArgumentException is thrown.

The String MUST be in the form returned by QName.toString() QName.toString() .

The commonly accepted way of representing a QName as a String was defined by James Clark. Although this is not a standard specification, it is in common use, e.g. javax.xml.transform.Transformer.setParameter(String nameObject value) . This implementation parses a String formatted as: "{" + Namespace URI + "}" + local part. If the Namespace URI .equals(XMLConstants.NULL_NS_URI), only the local part should be provided.

The prefix value CANNOT be represented in the String and will be set to javax.xml.XMLConstants.DEFAULT_NS_PREFIXXMLConstants.DEFAULT_NS_PREFIX .

This method does not do full validation of the resulting QName.

The Namespace URI is not validated as a URI reference. The local part is not validated as a NCName as specified in Namespaces in XML.


Parameters:
  qNameAsString - String representationof the QName
throws:
  IllegalArgumentException - When qNameAsString isnull or malformed QName corresponding to the given String
See Also:   QName.toString()
See Also:    QName.toString()



Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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