org.apache.xerces.util
Class XMLGrammarPoolImpl

java.lang.Object
  extended by org.apache.xerces.util.XMLGrammarPoolImpl
All Implemented Interfaces:
org.apache.xerces.xni.grammars.XMLGrammarPool
Direct Known Subclasses:
CachingParserPool.ShadowedGrammarPool, XSGrammarPool

public class XMLGrammarPoolImpl
extends java.lang.Object
implements org.apache.xerces.xni.grammars.XMLGrammarPool

Stores grammars in a pool associated to a specific key. This grammar pool implementation stores two types of grammars: those keyed by the root element name, and those keyed by the grammar's target namespace. This is the default implementation of the GrammarPool interface. As we move forward, this will become more function-rich and robust.

Version:
$Id: XMLGrammarPoolImpl.java 447241 2006-09-18 05:12:57Z mrglavas $
Author:
Jeffrey Rodriguez, IBM, Andy Clark, IBM, Neil Graham, IBM, Pavani Mukthipudi, Sun Microsystems, Neeraj Bajaj, SUN Microsystems

Nested Class Summary
protected static class XMLGrammarPoolImpl.Entry
          This class is a grammar pool entry.
 
Field Summary
protected  int fGrammarCount
           
protected  XMLGrammarPoolImpl.Entry[] fGrammars
          Grammars.
protected  boolean fPoolIsLocked
           
protected static int TABLE_SIZE
          Default size.
 
Constructor Summary
XMLGrammarPoolImpl()
          Constructs a grammar pool with a default number of buckets.
XMLGrammarPoolImpl(int initialCapacity)
          Constructs a grammar pool with a specified number of buckets.
 
Method Summary
 void cacheGrammars(java.lang.String grammarType, org.apache.xerces.xni.grammars.Grammar[] grammars)
          return the final set of grammars that the validator ended up with.
 void clear()
          Removes all grammars from the pool.
 boolean containsGrammar(org.apache.xerces.xni.grammars.XMLGrammarDescription desc)
          Returns true if the grammar pool contains a grammar associated to the specified grammar description.
 boolean equals(org.apache.xerces.xni.grammars.XMLGrammarDescription desc1, org.apache.xerces.xni.grammars.XMLGrammarDescription desc2)
          This method checks whether two grammars are the same.
 org.apache.xerces.xni.grammars.Grammar getGrammar(org.apache.xerces.xni.grammars.XMLGrammarDescription desc)
          Returns the grammar associated to the specified grammar description.
 int hashCode(org.apache.xerces.xni.grammars.XMLGrammarDescription desc)
          Returns the hash code value for the given grammar description.
 void lockPool()
          Causes the XMLGrammarPool not to store any grammars when the cacheGrammars(String, Grammar[[]) method is called.
 void putGrammar(org.apache.xerces.xni.grammars.Grammar grammar)
          Puts the specified grammar into the grammar pool and associates it to its root element name or its target namespace.
 org.apache.xerces.xni.grammars.Grammar removeGrammar(org.apache.xerces.xni.grammars.XMLGrammarDescription desc)
          Removes the grammar associated to the specified grammar description from the grammar pool and returns the removed grammar.
 org.apache.xerces.xni.grammars.Grammar retrieveGrammar(org.apache.xerces.xni.grammars.XMLGrammarDescription desc)
           This method requests that the application retrieve a grammar corresponding to the given GrammarIdentifier from its cache.
 org.apache.xerces.xni.grammars.Grammar[] retrieveInitialGrammarSet(java.lang.String grammarType)
           retrieve the initial known set of grammars.
 void unlockPool()
          Allows the XMLGrammarPool to store grammars when its cacheGrammars(String, Grammar[]) method is called.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Field Detail

TABLE_SIZE

protected static final int TABLE_SIZE
Default size.

See Also:
Constant Field Values

fGrammars

protected XMLGrammarPoolImpl.Entry[] fGrammars
Grammars.


fPoolIsLocked

protected boolean fPoolIsLocked

fGrammarCount

protected int fGrammarCount
Constructor Detail

XMLGrammarPoolImpl

public XMLGrammarPoolImpl()
Constructs a grammar pool with a default number of buckets.


XMLGrammarPoolImpl

public XMLGrammarPoolImpl(int initialCapacity)
Constructs a grammar pool with a specified number of buckets.

Method Detail

retrieveInitialGrammarSet

public org.apache.xerces.xni.grammars.Grammar[] retrieveInitialGrammarSet(java.lang.String grammarType)
Description copied from interface: org.apache.xerces.xni.grammars.XMLGrammarPool

retrieve the initial known set of grammars. this method is called by a validator before the validation starts. the application can provide an initial set of grammars available to the current validation attempt.

Specified by:
retrieveInitialGrammarSet in interface org.apache.xerces.xni.grammars.XMLGrammarPool
Parameters:
grammarType - the type of the grammar, from the org.apache.xerces.xni.grammars.Grammar interface.
Returns:
the set of grammars the validator may put in its "bucket"

cacheGrammars

public void cacheGrammars(java.lang.String grammarType,
                          org.apache.xerces.xni.grammars.Grammar[] grammars)
Description copied from interface: org.apache.xerces.xni.grammars.XMLGrammarPool

return the final set of grammars that the validator ended up with. This method is called after the validation finishes. The application may then choose to cache some of the returned grammars.

Specified by:
cacheGrammars in interface org.apache.xerces.xni.grammars.XMLGrammarPool
Parameters:
grammarType - the type of the grammars being returned;
grammars - an array containing the set of grammars being returned; order is not significant.

retrieveGrammar

public org.apache.xerces.xni.grammars.Grammar retrieveGrammar(org.apache.xerces.xni.grammars.XMLGrammarDescription desc)
Description copied from interface: org.apache.xerces.xni.grammars.XMLGrammarPool

This method requests that the application retrieve a grammar corresponding to the given GrammarIdentifier from its cache. If it cannot do so it must return null; the parser will then call the EntityResolver. An application must not call its EntityResolver itself from this method; this may result in infinite recursions.

Specified by:
retrieveGrammar in interface org.apache.xerces.xni.grammars.XMLGrammarPool
Parameters:
desc - The description of the Grammar being requested.
Returns:
the Grammar corresponding to this description or null if no such Grammar is known.

putGrammar

public void putGrammar(org.apache.xerces.xni.grammars.Grammar grammar)
Puts the specified grammar into the grammar pool and associates it to its root element name or its target namespace.

Parameters:
grammar - The Grammar.

getGrammar

public org.apache.xerces.xni.grammars.Grammar getGrammar(org.apache.xerces.xni.grammars.XMLGrammarDescription desc)
Returns the grammar associated to the specified grammar description. Currently, the root element name is used as the key for DTD grammars and the target namespace is used as the key for Schema grammars.

Parameters:
desc - The Grammar Description.

removeGrammar

public org.apache.xerces.xni.grammars.Grammar removeGrammar(org.apache.xerces.xni.grammars.XMLGrammarDescription desc)
Removes the grammar associated to the specified grammar description from the grammar pool and returns the removed grammar. Currently, the root element name is used as the key for DTD grammars and the target namespace is used as the key for Schema grammars.

Parameters:
desc - The Grammar Description.
Returns:
The removed grammar.

containsGrammar

public boolean containsGrammar(org.apache.xerces.xni.grammars.XMLGrammarDescription desc)
Returns true if the grammar pool contains a grammar associated to the specified grammar description. Currently, the root element name is used as the key for DTD grammars and the target namespace is used as the key for Schema grammars.

Parameters:
desc - The Grammar Description.

lockPool

public void lockPool()
Description copied from interface: org.apache.xerces.xni.grammars.XMLGrammarPool
Causes the XMLGrammarPool not to store any grammars when the cacheGrammars(String, Grammar[[]) method is called.

Specified by:
lockPool in interface org.apache.xerces.xni.grammars.XMLGrammarPool

unlockPool

public void unlockPool()
Description copied from interface: org.apache.xerces.xni.grammars.XMLGrammarPool
Allows the XMLGrammarPool to store grammars when its cacheGrammars(String, Grammar[]) method is called. This is the default state of the object.

Specified by:
unlockPool in interface org.apache.xerces.xni.grammars.XMLGrammarPool

clear

public void clear()
Description copied from interface: org.apache.xerces.xni.grammars.XMLGrammarPool
Removes all grammars from the pool.

Specified by:
clear in interface org.apache.xerces.xni.grammars.XMLGrammarPool

equals

public boolean equals(org.apache.xerces.xni.grammars.XMLGrammarDescription desc1,
                      org.apache.xerces.xni.grammars.XMLGrammarDescription desc2)
This method checks whether two grammars are the same. Currently, we compare the root element names for DTD grammars and the target namespaces for Schema grammars. The application can override this behaviour and add its own logic.

Parameters:
desc1 - The grammar description
desc2 - The grammar description of the grammar to be compared to
Returns:
True if the grammars are equal, otherwise false

hashCode

public int hashCode(org.apache.xerces.xni.grammars.XMLGrammarDescription desc)
Returns the hash code value for the given grammar description.

Parameters:
desc - The grammar description
Returns:
The hash code value


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