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## org.dom4j.tree
Class QNameCache

    java.lang.Object
      org.dom4j.tree.QNameCache

public class QNameCache
extends Object

`QNameCache` caches instances of `QName` for reuse both across documents and within documents.

< < < < < < < QNameCache.java

Version:
  $Revision: 1.16 $ =======, $Revision: 1.16 $ >>>>>>> 1.15
Author:
  James Strachan , James Strachan

Field Summary
`protected Map` | `namespaceCache` Cache of `Map`instances indexed by namespace which contain caches of `QName`for each name
`protected Map` | `noNamespaceCache` Cache of `QName`instances with no namespace

Constructor Summary
`QNameCache()`
`QNameCache(DocumentFactory documentFactory)`

Method Summary
`protected Map` | `createMap()` A factory method
`protected QName` | `createQName(String name)` Factory method to create a new QName object which can be overloaded to create derived QName instances
`protected QName` | `createQName(String name, Namespace namespace)` Factory method to create a new QName object which can be overloaded to create derived QName instances
`protected QName` | `createQName(String name, Namespace namespace, String qualifiedName)` Factory method to create a new QName object which can be overloaded to create derived QName instances
`QName` | `get(String name)` DOCUMENT ME!
`QName` | `get(String name, Namespace namespace)` DOCUMENT ME!
`QName` | `get(String localName, Namespace namespace, String qName)` DOCUMENT ME!
`QName` | `get(String qualifiedName, String uri)`
`protected Map` | `getNamespaceCache(Namespace namespace)` DOCUMENT ME!
`List` | `getQNames()` Returns a list of all the QName instances currently used
`QName` | `intern(QName qname)` DOCUMENT ME!

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### noNamespaceCache

    protected Map noNamespaceCache

  Cache of `QName`instances with no namespace

### namespaceCache

    protected Map namespaceCache

  Cache of `Map`instances indexed by namespace which contain caches of `QName`for each name

Constructor Detail

### QNameCache

    public QNameCache()

### QNameCache

    public QNameCache(DocumentFactory documentFactory)

Method Detail

### getQNames

    public List getQNames()

  Returns a list of all the QName instances currently used

  Returns:
    DOCUMENT ME!

### get

    public QName get(String name)

  DOCUMENT ME!

  Parameters:
    `name` - DOCUMENT ME!
  Returns:
    the QName for the given name and no namepsace

### get

    public QName get(String name,
                     Namespace namespace)

  DOCUMENT ME!

  Parameters:
    `name` - DOCUMENT ME!
    `namespace` - DOCUMENT ME!
  Returns:
    the QName for the given local name and namepsace

### get

    public QName get(String localName,
                     Namespace namespace,
                     String qName)

  DOCUMENT ME!

  Parameters:
    `localName` - DOCUMENT ME!
    `namespace` - DOCUMENT ME!
    `qName` - DOCUMENT ME!
  Returns:
    the QName for the given local name, qualified name and namepsace

### get

    public QName get(String qualifiedName,
                     String uri)

### intern

    public QName intern(QName qname)

  DOCUMENT ME!

  Parameters:
    `qname` - DOCUMENT ME!
  Returns:
    the cached QName instance if there is one or adds the given qname to the cache if not

### getNamespaceCache

    protected Map getNamespaceCache(Namespace namespace)

  DOCUMENT ME!

  Parameters:
    `namespace` - DOCUMENT ME!
  Returns:
    the cache for the given namespace. If one does not currently exist it is created.

### createMap

    protected Map createMap()

  A factory method

  Returns:
    a newly created `Map`instance.

### createQName

    protected QName createQName(String name)

  Factory method to create a new QName object which can be overloaded to create derived QName instances

  Parameters:
    `name` - DOCUMENT ME!
  Returns:
    DOCUMENT ME!

### createQName

    protected QName createQName(String name,
                                Namespace namespace)

  Factory method to create a new QName object which can be overloaded to create derived QName instances

  Parameters:
    `name` - DOCUMENT ME!
    `namespace` - DOCUMENT ME!
  Returns:
    DOCUMENT ME!

### createQName

    protected QName createQName(String name,
                                Namespace namespace,
                                String qualifiedName)

  Factory method to create a new QName object which can be overloaded to create derived QName instances

  Parameters:
    `name` - DOCUMENT ME!
    `namespace` - DOCUMENT ME!
    `qualifiedName` - DOCUMENT ME!
  Returns:
    DOCUMENT ME!

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