org.apache.jackrabbit.oak.plugins.memory

Class AbstractBlob

java.lang.Object

org.apache.jackrabbit.oak.plugins.memory.AbstractBlob

All Implemented Interfaces:

Blob

Direct Known Subclasses:

ArrayBasedBlob, StringBasedBlob

public abstract class AbstractBlob
extends java.lang.Object
implements Blob

Abstract base class for Blob implementations. This base class provides default implementations for hashCode and equals.

Method Summary

Modifier and Type	Method and Description
static com.google.common.hash.HashCode	calculateSha256(Blob blob)
static boolean	equal(Blob a, Blob b)
boolean	equals(java.lang.Object other) To Blob instances are considered equal iff they have the same SHA-256 hash code are equal.
java.lang.String	getContentIdentity() A unique identifier of the content of this value.
@Nullable java.lang.String	getReference() Returns a secure reference to this blob, or null if such a reference is not available.
int	hashCode()
java.lang.String	toString()

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.apache.jackrabbit.oak.api.Blob

getNewStream, isInlined, length

Method Detail

equal

public static boolean equal(Blob a,
                            Blob b)

calculateSha256

public static com.google.common.hash.HashCode calculateSha256(Blob blob)

getReference

@Nullable
public @Nullable java.lang.String getReference()

Description copied from interface: Blob

Returns a secure reference to this blob, or null if such a reference is not available.

Specified by:

getReference in interface Blob

Returns:

binary reference, or null

See Also:

OAK-834

getContentIdentity

public java.lang.String getContentIdentity()

Description copied from interface: Blob

A unique identifier of the content of this value. Usually this is a message digest of the content (a cryptographically secure one-way hash). This allows to avoid processing large binary values multiple times.

This method returns null if the identifier is unknown. The identifier may not always be available, for example if the value has not yet been saved or processed. Once an identifier is available, it will never change because values are immutable.

If two values have the same identifier, the content of the value is guaranteed to be the same. However it is not guaranteed that two values with the same content will return the same identifier.

The identifier is opaque, meaning it can have any format and size.

Specified by:

getContentIdentity in interface Blob

Returns:

the unique identifier or null

equals

public boolean equals(java.lang.Object other)

To Blob instances are considered equal iff they have the same SHA-256 hash code are equal.

Overrides:

equals in class java.lang.Object

Parameters:

other -

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object