com.bigdata.rdf.internal

Class IVUtility

java.lang.Object

com.bigdata.rdf.internal.IVUtility

public class IVUtility
extends Object

Helper class for IVs.

Field Summary

Fields

Modifier and Type	Field and Description
static boolean	PACK_TIDS When true, we will pack term identifiers using LongPacker.

Constructor Summary

Constructors

Constructor and Description
IVUtility()

Method Summary

Methods

Modifier and Type	Method and Description
static int	compare(IV iv1, IV iv2) This provides a dumb comparison across IVs.
static IV	decode(byte[] key) Decode an IV from a byte[].
static IV[]	decode(byte[] key, int numTerms) Decodes up to numTerms IVs from a byte[].
static IV[]	decode(byte[] key, int offset, int numTerms) Decodes up to numTerms IVs from a byte[].
static IV[]	decodeAll(byte[] key) Decodes all IVs from a byte[].
static IV[]	decodeAll(byte[] key, int off, int len) Decodes IVs from a slice of a byte[].
static IV	decodeFromOffset(byte[] key, int offset) Decode one IV.
static IV	decodeFromOffset(byte[] key, int offset, boolean nullIsNullRef) Decode one IV.
static IKeyBuilder	encode(IKeyBuilder keyBuilder, IV iv) Encode an RDF value into a key for one of the statement indices.
static boolean	equals(IV iv1, IV iv2)

Methods inherited from class java.lang.Object

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

Field Detail

PACK_TIDS

public static final boolean PACK_TIDS

When true, we will pack term identifiers using LongPacker.

Note: This option requires that term identifiers are non-negative. That is not currently true for the cluster due to the TermIdEncoder.

See Also:

Pack TIDs, Constant Field Values

Constructor Detail

IVUtility

public IVUtility()

Method Detail

equals

public static boolean equals(IV iv1,
             IV iv2)

compare

public static int compare(IV iv1,
          IV iv2)

This provides a dumb comparison across IVs.

encode

public static IKeyBuilder encode(IKeyBuilder keyBuilder,
                 IV iv)

Encode an RDF value into a key for one of the statement indices. Handles null IV references gracefully.

Parameters:

keyBuilder - The key builder.

iv - The internal value (can be null).

Returns:

The key builder.

decode

public static IV decode(byte[] key)

Decode an IV from a byte[].

Parameters:

key - The byte[].

Returns:

The IV.

decode

public static IV[] decode(byte[] key,
          int numTerms)

Decodes up to numTerms IVs from a byte[].

Parameters:

key - The byte[].

numTerms - The number of terms to decode.

Returns:

The set of IVs.

decode

public static IV[] decode(byte[] key,
          int offset,
          int numTerms)

Decodes up to numTerms IVs from a byte[].

Parameters:

key - The byte[].

offset - The offset into the byte[] key.

numTerms - The number of terms to decode.

Returns:

The set of IVs.

decodeAll

public static IV[] decodeAll(byte[] key)

Decodes all IVs from a byte[].

Parameters:

key - The byte[].

Returns:

The set of IVs.

decodeAll

public static IV[] decodeAll(byte[] key,
             int off,
             int len)

Decodes IVs from a slice of a byte[].

Parameters:

key - The byte[].

off - The offset of the first encoded IV in the byte[].

len - The #of bytes of valid data to be decoded starting at that offset.

Returns:

The IVs in the order in which they were decoded.

decodeFromOffset

public static IV decodeFromOffset(byte[] key,
                  int offset)

Decode one IV.

Parameters:

key - The unsigned byte[] key.

offset - The offset.

Returns:

The IV decoded from that offset.

decodeFromOffset

public static IV decodeFromOffset(byte[] key,
                  int offset,
                  boolean nullIsNullRef)

Decode one IV.

Parameters:

key - The unsigned byte[] key.

offset - The offset.

nullIsNullRef - When true a termId:=0L IV is decoded as a null reference. Otherwise it is decoded using TermId.mockIV(VTE).

Returns:

The IV decoded from that offset.