liquibase.change

Class CheckSum

java.lang.Object

liquibase.change.CheckSum

public final class CheckSum
extends Object

CheckSums are used by liquibase to determine if a Change has been modified since it was originally ran. CheckSums can be computed on either a String or an InputStream. The CheckSum contains a version number which can be used to determine whether the algorithm for computing a storedCheckSum has changed since the last time it was computed. If the algorithm changes, we cannot rely on the storedCheckSum value.

It is not up to this class to determine what should be storedCheckSum-ed, it simply hashes what is passed to it.

Field Summary

Fields

Modifier and Type	Field and Description
static int	CURRENT_CHECKSUM_ALGORITHM_VERSION

Method Summary

Methods

Modifier and Type	Method and Description
static CheckSum	compute(InputStream stream, boolean standardizeLineEndings) Compute a CheckSum of the given data stream (no normalization of line endings!)
static CheckSum	compute(String valueToChecksum) Compute a storedCheckSum of the given string.
boolean	equals(Object obj)
static int	getCurrentVersion() Return the current CheckSum algorithm version.
int	getVersion() Return the Checksum Algorithm version for this CheckSum
int	hashCode()
static CheckSum	parse(String checksumValue) Parse the given storedCheckSum string value and return a new CheckSum object.
String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

CURRENT_CHECKSUM_ALGORITHM_VERSION

public static final int CURRENT_CHECKSUM_ALGORITHM_VERSION

See Also:

Constant Field Values

Method Detail

parse

public static CheckSum parse(String checksumValue)

Parse the given storedCheckSum string value and return a new CheckSum object.

getCurrentVersion

public static int getCurrentVersion()

Return the current CheckSum algorithm version.

compute

public static CheckSum compute(String valueToChecksum)

Compute a storedCheckSum of the given string.

compute

public static CheckSum compute(InputStream stream,
               boolean standardizeLineEndings)

Compute a CheckSum of the given data stream (no normalization of line endings!)

toString

public String toString()

Overrides:

toString in class Object

getVersion

public int getVersion()

Return the Checksum Algorithm version for this CheckSum

hashCode

public int hashCode()

Overrides:

hashCode in class Object

equals

public boolean equals(Object obj)

Overrides:

equals in class Object