Package org.projog.core.predicate.builtin.db

Class RecordedDatabase

java.lang.Object

org.projog.core.predicate.builtin.db.RecordedDatabase

public class RecordedDatabase
extends java.lang.Object

Provides a mechanism to associate a term with a key.

Multiple terms can be associated with the same key.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
private static class	RecordedDatabase.Chain
private static class	RecordedDatabase.ChainIterator
private class	RecordedDatabase.DatabaseIterator
private static class	RecordedDatabase.Link

Field Summary

Fields

Modifier and Type	Field	Description
private java.util.SortedMap<PredicateKey,RecordedDatabase.Chain>	chains
private java.util.List<PredicateKey>	keys
private java.util.concurrent.atomic.AtomicLong	referenceCtr
private java.util.SortedMap<java.lang.Long,RecordedDatabase.Link>	references

Constructor Summary

Constructors

Constructor	Description
RecordedDatabase()

Method Summary

Modifier and Type	Method	Description
(package private) IntegerNumber	add(PredicateKey key, Term value, boolean addLast)	Associates a value with a key.
private void	addReference(IntegerNumber reference, RecordedDatabase.Link link, boolean addLast)
private RecordedDatabase.Chain	createChain(PredicateKey key)
private RecordedDatabase.Link	createLink(RecordedDatabase.Chain chain, Term value, boolean addLast)
private IntegerNumber	createReference()
(package private) boolean	erase(java.lang.Long reference)
(package private) java.util.Iterator<Record>	getAll()
(package private) java.util.Iterator<Record>	getChain(PredicateKey key)
private RecordedDatabase.Chain	getOrCreateChain(PredicateKey key)
private boolean	removeReference(java.lang.Long reference)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

referenceCtr

private final java.util.concurrent.atomic.AtomicLong referenceCtr

references

private final java.util.SortedMap<java.lang.Long,RecordedDatabase.Link> references

keys

private final java.util.List<PredicateKey> keys

chains

private final java.util.SortedMap<PredicateKey,RecordedDatabase.Chain> chains

Constructor Detail

RecordedDatabase

public RecordedDatabase()

Method Detail

add

IntegerNumber add(PredicateKey key,
                  Term value,
                  boolean addLast)

Associates a value with a key.

Parameters:

key - the key to associate the value with

value - the value to store

Returns:

reference for the newly added value

getAll

java.util.Iterator<Record> getAll()

getChain

java.util.Iterator<Record> getChain(PredicateKey key)

erase

boolean erase(java.lang.Long reference)

Parameters:

reference - the reference of the term to remove

Returns:

true if a term was removed else false (i.e. if there was no term associated with the specified reference)

getOrCreateChain

private RecordedDatabase.Chain getOrCreateChain(PredicateKey key)

createChain

private RecordedDatabase.Chain createChain(PredicateKey key)

createLink

private RecordedDatabase.Link createLink(RecordedDatabase.Chain chain,
                                         Term value,
                                         boolean addLast)

createReference

private IntegerNumber createReference()

addReference

private void addReference(IntegerNumber reference,
                          RecordedDatabase.Link link,
                          boolean addLast)

removeReference

private boolean removeReference(java.lang.Long reference)