abstract class AbstractHashFunction extends java.lang.Object implements HashFunction
HashFunction in terms of HashFunction.newHasher().
TODO(lowasser): make public
| Constructor and Description |
|---|
AbstractHashFunction() |
| Modifier and Type | Method and Description |
|---|---|
HashCode |
hashBytes(byte[] input)
Shortcut for
newHasher().putBytes(input).hash(). |
HashCode |
hashBytes(byte[] input,
int off,
int len)
Shortcut for
newHasher().putBytes(input, off, len).hash(). |
HashCode |
hashBytes(java.nio.ByteBuffer input)
Shortcut for
newHasher().putBytes(input).hash(). |
HashCode |
hashInt(int input)
Shortcut for
newHasher().putInt(input).hash(); returns the hash code for the given
int value, interpreted in little-endian byte order. |
HashCode |
hashLong(long input)
Shortcut for
newHasher().putLong(input).hash(); returns the hash code for the given
long value, interpreted in little-endian byte order. |
<T> HashCode |
hashObject(T instance,
Funnel<? super T> funnel)
Shortcut for
newHasher().putObject(instance, funnel).hash(). |
HashCode |
hashString(java.lang.CharSequence input,
java.nio.charset.Charset charset)
Shortcut for
newHasher().putString(input, charset).hash(). |
HashCode |
hashUnencodedChars(java.lang.CharSequence input)
Shortcut for
newHasher().putUnencodedChars(input).hash(). |
Hasher |
newHasher(int expectedInputSize)
Begins a new hash code computation as
HashFunction.newHasher(), but provides a hint of the expected
size of the input (in bytes). |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, waitbits, newHasherpublic <T> HashCode hashObject(T instance, Funnel<? super T> funnel)
HashFunctionnewHasher().putObject(instance, funnel).hash(). The implementation
might perform better than its longhand equivalent, but should not perform worse.hashObject in interface HashFunctionpublic HashCode hashUnencodedChars(java.lang.CharSequence input)
HashFunctionnewHasher().putUnencodedChars(input).hash(). The implementation
might perform better than its longhand equivalent, but should not perform worse. Note
that no character encoding is performed; the low byte and high byte of each char are
hashed directly (in that order).
Warning: This method will produce different output than most other languages do when
running the same hash function on the equivalent input. For cross-language compatibility, use
HashFunction.hashString(java.lang.CharSequence, java.nio.charset.Charset), usually with a charset of UTF-8. For other use cases, use hashUnencodedChars.
hashUnencodedChars in interface HashFunctionpublic HashCode hashString(java.lang.CharSequence input, java.nio.charset.Charset charset)
HashFunctionnewHasher().putString(input, charset).hash(). Characters are encoded using
the given Charset. The implementation might perform better than its longhand
equivalent, but should not perform worse.
Warning: This method, which reencodes the input before hashing it, is useful only for
cross-language compatibility. For other use cases, prefer HashFunction.hashUnencodedChars(java.lang.CharSequence), which is
faster, produces the same output across Java releases, and hashes every char in the
input, even if some are invalid.
hashString in interface HashFunctionpublic HashCode hashInt(int input)
HashFunctionnewHasher().putInt(input).hash(); returns the hash code for the given
int value, interpreted in little-endian byte order. The implementation might
perform better than its longhand equivalent, but should not perform worse.hashInt in interface HashFunctionpublic HashCode hashLong(long input)
HashFunctionnewHasher().putLong(input).hash(); returns the hash code for the given
long value, interpreted in little-endian byte order. The implementation might
perform better than its longhand equivalent, but should not perform worse.hashLong in interface HashFunctionpublic HashCode hashBytes(byte[] input)
HashFunctionnewHasher().putBytes(input).hash(). The implementation might
perform better than its longhand equivalent, but should not perform worse.hashBytes in interface HashFunctionpublic HashCode hashBytes(byte[] input, int off, int len)
HashFunctionnewHasher().putBytes(input, off, len).hash(). The implementation
might perform better than its longhand equivalent, but should not perform worse.hashBytes in interface HashFunctionpublic HashCode hashBytes(java.nio.ByteBuffer input)
HashFunctionnewHasher().putBytes(input).hash(). The implementation might
perform better than its longhand equivalent, but should not perform worse.hashBytes in interface HashFunctionpublic Hasher newHasher(int expectedInputSize)
HashFunctionHashFunction.newHasher(), but provides a hint of the expected
size of the input (in bytes). This is only important for non-streaming hash functions (hash
functions that need to buffer their whole input before processing any of it).newHasher in interface HashFunction