Package com.amazonaws.services.glacier
Class TreeHashGenerator
- java.lang.Object
-
- com.amazonaws.services.glacier.TreeHashGenerator
-
public class TreeHashGenerator extends Object
Utility class for calculating tree hashes.For more information on tree hashing, see http://en.wikipedia.org/wiki/Hash_tree.
-
-
Constructor Summary
Constructors Constructor Description TreeHashGenerator()
-
Method Summary
All Methods Static Methods Concrete Methods Modifier and Type Method Description static String
calculateTreeHash(File file)
Calculates a hex encoded binary hash using a tree hashing algorithm for the data in the specified file.static String
calculateTreeHash(InputStream input)
Calculates a hex encoded binary hash using a tree hashing algorithm for the data in the specified input stream.static String
calculateTreeHash(List<byte[]> checksums)
Returns the hex encoded binary tree hash for the individual checksums given.
-
-
-
Method Detail
-
calculateTreeHash
public static String calculateTreeHash(File file) throws AmazonClientException
Calculates a hex encoded binary hash using a tree hashing algorithm for the data in the specified file.- Parameters:
file
- The file containing the data to hash.- Returns:
- The hex encoded binary tree hash for the data in the specified file.
- Throws:
AmazonClientException
- If any problems were encountered reading the data or computing the hash.
-
calculateTreeHash
public static String calculateTreeHash(InputStream input) throws AmazonClientException
Calculates a hex encoded binary hash using a tree hashing algorithm for the data in the specified input stream. The method will consume all the inputStream and close it when returned.- Parameters:
input
- The input stream containing the data to hash.- Returns:
- The hex encoded binary tree hash for the data in the specified input stream.
- Throws:
AmazonClientException
- If problems were encountered reading the data or calculating the hash.
-
calculateTreeHash
public static String calculateTreeHash(List<byte[]> checksums) throws AmazonClientException
Returns the hex encoded binary tree hash for the individual checksums given. The sums are assumed to have been generated from sequential 1MB portions of a larger file, with the possible exception of the last part, which may be less than a full MB.- Returns:
- The combined hex encoded binary tree hash for the individual checksums specified.
- Throws:
AmazonClientException
- If problems were encountered reading the data or calculating the hash.
-
-