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Java Source Code / Java Documentation » XML » XPath Saxon » net.sf.saxon.trans 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   net.sf.saxon.trans.KeyManager

KeyManager
public class KeyManager implements Serializable(Code)
KeyManager manages the set of key definitions in a stylesheet, and the indexes associated with these key definitions. It handles xsl:sort-key as well as xsl:key definitions.

The memory management in this class is subtle, with extensive use of weak references. The idea is that an index should continue to exist in memory so long as both the compiled stylesheet and the source document exist in memory: if either is removed, the index should go too. The document itself holds no reference to the index. The compiled stylesheet (which owns the KeyManager) holds a weak reference to the index. The index, of course, holds strong references to the nodes in the document. The Controller holds a strong reference to the list of indexes used for each document, so that indexes remain in memory for the duration of a transformation even if the documents themselves are garbage collected.

Potentially there is a need for more than one index for a given key name, depending on the primitive type of the value provided to the key() function. An index is built corresponding to the type of the requested value; if subsequently the key() function is called with the same name and a different type of value, then a new index is built.


author:
   Michael H. Kay



Constructor Summary
public  KeyManager(Configuration config)
    

Method Summary
public  voidaddKeyDefinition(int fingerprint, KeyDefinition keydef, NamePool namePool)
     Register a key definition.
public  ListgetKeyDefinitions(int fingerprint)
    
public  SequenceIteratorselectByKey(int fingerprint, DocumentInfo doc, AtomicValue value, XPathContext context)
    


Constructor Detail
KeyManager
public KeyManager(Configuration config)(Code)
create a KeyManager and initialise variables




Method Detail
addKeyDefinition
public void addKeyDefinition(int fingerprint, KeyDefinition keydef, NamePool namePool) throws TransformerConfigurationException(Code)
Register a key definition. Note that multiple key definitions with the same name are allowed
Parameters:
  fingerprint - Integer representing the name of the key
Parameters:
  keydef - The details of the key's definition
Parameters:
  namePool -



getKeyDefinitions
public List getKeyDefinitions(int fingerprint)(Code)
Get all the key definitions that match a particular fingerprint
Parameters:
  fingerprint - The fingerprint of the name of the required key The key definition of the named key if there is one, or null otherwise.



selectByKey
public SequenceIterator selectByKey(int fingerprint, DocumentInfo doc, AtomicValue value, XPathContext context) throws XPathException(Code)
Get the nodes with a given key value
Parameters:
  fingerprint - The fingerprint of the name of the required key
Parameters:
  doc - The source document in question
Parameters:
  value - The required key value
Parameters:
  context - The dynamic context, needed only the first time when the key is being built an enumeration of nodes, always in document order



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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