org.hypergraphdb.type.javaprimitive

Class BooleanPrimitiveArrayType

java.lang.Object

org.hypergraphdb.type.javaprimitive.PrimitiveArrayType

org.hypergraphdb.type.javaprimitive.BooleanPrimitiveArrayType

All Implemented Interfaces:

HGGraphHolder, HGAtomType

public class BooleanPrimitiveArrayType
extends PrimitiveArrayType

Boolean arrays are stored using a byte for each boolean value (as usual, 0 for false and 1 for true). There is aways one byte in front of the actual array to indicate whether we have an empty array or not. If the array is empty, the first and only byte has a value of 0; otherwise, its value is one.

Author:

Borislav Iordanov

Field Summary

Fields inherited from class org.hypergraphdb.type.javaprimitive.PrimitiveArrayType

hg

Constructor Summary

Constructors

Constructor and Description
BooleanPrimitiveArrayType()

Method Summary

Methods

Modifier and Type	Method and Description
Object	make(HGPersistentHandle handle, LazyRef<HGHandle[]> targetSet, IncidenceSetRef incidenceSet) Construct a new run-time instance of a hypergraph atom.
HGPersistentHandle	store(Object instance) Store a run-time instance of a hypergraph atom into the hypergraph HGStore as a new atom.

Methods inherited from class org.hypergraphdb.type.javaprimitive.PrimitiveArrayType

release, setHyperGraph, subsumes

Methods inherited from class java.lang.Object

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

Constructor Detail

BooleanPrimitiveArrayType

public BooleanPrimitiveArrayType()

Method Detail

make

public Object make(HGPersistentHandle handle,
          LazyRef<HGHandle[]> targetSet,
          IncidenceSetRef incidenceSet)

Description copied from interface: HGAtomType

Construct a new run-time instance of a hypergraph atom. A plain node must be constructed whenever the targetSet parameter is null or of length 0. Otherwise, a HGLink instance must be constructed.

It is not required that all atom types be able to construct both plain (node) atoms and HGLinks. It is up to an HGAtomType implementation to support either or both. When a HGLink counterpart is not available for a particular run-time type, an implementation may choose to create an instance of the default link value holder implementation HGValuedLink, provided by HyperGraph.

Parameters:

handle - The HGPersistentHandle of the atom value.

targetSet - When the atom is a link, this parameter holds the target set of the link. When the atom is a node, the parameter is an array of 0 length.

incidenceSet - A lazy reference to the set of links pointing to this atom. This is null if we are constructing an internal/nested value of some complex type.

Returns:

The run-time atom instance. The return value should never be null. In case the handle points to an invalid instance (inexisting or with a erronous layout), the method should throw a HGException.

store

public HGPersistentHandle store(Object instance)

Description copied from interface: HGAtomType

Store a run-time instance of a hypergraph atom into the hypergraph HGStore as a new atom.

Parameters:

instance - The atom instance.

Returns:

The persistent handle of the stored value.