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add support for java 1.5

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This commit is contained in:
Jonathan Leibiusky
2010-11-21 19:53:43 -03:00
parent 71eb4c5b4a
commit 098de44a07
21 changed files with 485 additions and 451 deletions
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130
src/main/java/redis/clients/util/MurmurHash.java
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@@ -20,8 +20,6 @@ package redis.clients.util;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import redis.clients.jedis.Protocol;
/**
* This is a very fast, non-cryptographic hash suitable for general hash-based
* lookup. See http://murmurhash.googlepages.com/ for more details.
@@ -42,7 +40,7 @@ public class MurmurHash implements Hashing {
* @return The 32 bit hash of the bytes in question.
*/
public static int hash(byte[] data, int seed) {
return hash(ByteBuffer.wrap(data), seed);
return hash(ByteBuffer.wrap(data), seed);
}
/**
@@ -59,7 +57,7 @@ public class MurmurHash implements Hashing {
* @return The 32-bit hash of the data in question.
*/
public static int hash(byte[] data, int offset, int length, int seed) {
return hash(ByteBuffer.wrap(data, offset, length), seed);
return hash(ByteBuffer.wrap(data, offset, length), seed);
}
/**
@@ -72,97 +70,97 @@ public class MurmurHash implements Hashing {
* @return The 32 bit murmur hash of the bytes in the buffer.
*/
public static int hash(ByteBuffer buf, int seed) {
// save byte order for later restoration
ByteOrder byteOrder = buf.order();
buf.order(ByteOrder.LITTLE_ENDIAN);
// save byte order for later restoration
ByteOrder byteOrder = buf.order();
buf.order(ByteOrder.LITTLE_ENDIAN);
int m = 0x5bd1e995;
int r = 24;
int m = 0x5bd1e995;
int r = 24;
int h = seed ^ buf.remaining();
int h = seed ^ buf.remaining();
int k;
while (buf.remaining() >= 4) {
k = buf.getInt();
int k;
while (buf.remaining() >= 4) {
k = buf.getInt();
k *= m;
k ^= k >>> r;
k *= m;
k *= m;
k ^= k >>> r;
k *= m;
h *= m;
h ^= k;
}
h *= m;
h ^= k;
}
if (buf.remaining() > 0) {
ByteBuffer finish = ByteBuffer.allocate(4).order(
ByteOrder.LITTLE_ENDIAN);
// for big-endian version, use this first:
// finish.position(4-buf.remaining());
finish.put(buf).rewind();
h ^= finish.getInt();
h *= m;
}
if (buf.remaining() > 0) {
ByteBuffer finish = ByteBuffer.allocate(4).order(
ByteOrder.LITTLE_ENDIAN);
// for big-endian version, use this first:
// finish.position(4-buf.remaining());
finish.put(buf).rewind();
h ^= finish.getInt();
h *= m;
}
h ^= h >>> 13;
h *= m;
h ^= h >>> 15;
h ^= h >>> 13;
h *= m;
h ^= h >>> 15;
buf.order(byteOrder);
return h;
buf.order(byteOrder);
return h;
}
public static long hash64A(byte[] data, int seed) {
return hash64A(ByteBuffer.wrap(data), seed);
return hash64A(ByteBuffer.wrap(data), seed);
}
public static long hash64A(byte[] data, int offset, int length, int seed) {
return hash64A(ByteBuffer.wrap(data, offset, length), seed);
return hash64A(ByteBuffer.wrap(data, offset, length), seed);
}
public static long hash64A(ByteBuffer buf, int seed) {
ByteOrder byteOrder = buf.order();
buf.order(ByteOrder.LITTLE_ENDIAN);
ByteOrder byteOrder = buf.order();
buf.order(ByteOrder.LITTLE_ENDIAN);
long m = 0xc6a4a7935bd1e995L;
int r = 47;
long m = 0xc6a4a7935bd1e995L;
int r = 47;
long h = seed ^ (buf.remaining() * m);
long h = seed ^ (buf.remaining() * m);
long k;
while (buf.remaining() >= 8) {
k = buf.getLong();
long k;
while (buf.remaining() >= 8) {
k = buf.getLong();
k *= m;
k ^= k >>> r;
k *= m;
k *= m;
k ^= k >>> r;
k *= m;
h ^= k;
h *= m;
}
h ^= k;
h *= m;
}
if (buf.remaining() > 0) {
ByteBuffer finish = ByteBuffer.allocate(8).order(
ByteOrder.LITTLE_ENDIAN);
// for big-endian version, do this first:
// finish.position(8-buf.remaining());
finish.put(buf).rewind();
h ^= finish.getLong();
h *= m;
}
if (buf.remaining() > 0) {
ByteBuffer finish = ByteBuffer.allocate(8).order(
ByteOrder.LITTLE_ENDIAN);
// for big-endian version, do this first:
// finish.position(8-buf.remaining());
finish.put(buf).rewind();
h ^= finish.getLong();
h *= m;
}
h ^= h >>> r;
h *= m;
h ^= h >>> r;
h ^= h >>> r;
h *= m;
h ^= h >>> r;
buf.order(byteOrder);
return h;
buf.order(byteOrder);
return h;
}
public long hash(byte[] key) {
return hash64A(key, 0x1234ABCD);
return hash64A(key, 0x1234ABCD);
}
public long hash(String key) {
return hash(key.getBytes(Protocol.UTF8));
return hash(SafeEncoder.encode(key));
}
}