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Revision 7588, 20.1 KB checked in by adir, 11 years ago (diff)
Ticket #000 - Adicionando a integracao de buscas com Solr na base a ser isnerida na comunidade

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91	org.apache.solr.common.util</FONT>
92	<BR>
93	Class Hash</H2>
94	<PRE>
95	<A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">java.lang.Object</A>
96	<IMG SRC="../../../../../resources/inherit.gif" ALT="extended by "><B>org.apache.solr.common.util.Hash</B>
97	</PRE>
98	<HR>
99	<DL>
100	<DT><PRE>public class <B>Hash</B><DT>extends <A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</A></DL>
101	</PRE>
102
103	<P>
104	<p>Fast, well distributed, cross-platform hash functions.
105	</p>
106
107	<p>Development background: I was surprised to discovered that there isn't a good cross-platform hash function defined for strings. MD5, SHA, FVN, etc, all define hash functions over bytes, meaning that it's under-specified for strings.
108	</p>
109
110	<p>So I set out to create a standard 32 bit string hash that would be well defined for implementation in all languages, have very high performance, and have very good hash properties such as distribution. After evaluating all the options, I settled on using Bob Jenkins' lookup3 as a base. It's a well studied and very fast hash function, and the hashword variant can work with 32 bits at a time (perfect for hashing unicode code points). It's also even faster on the latest JVMs which can translate pairs of shifts into native rotate instructions.
111	</p>
112	<p>The only problem with using lookup3 hashword is that it includes a length in the initial value. This would suck some performance out since directly hashing a UTF8 or UTF16 string (Java) would require a pre-scan to get the actual number of unicode code points. The solution was to simply remove the length factor, which is equivalent to biasing initVal by -(numCodePoints*4). This slightly modified lookup3 I define as lookup3ycs.
113	</p>
114	<p>So the definition of the cross-platform string hash lookup3ycs is as follows:
115	</p>
116	<p>The hash value of a character sequence (a string) is defined to be the hash of its unicode code points, according to lookup3 hashword, with the initval biased by -(length*4).
117	</p>
118	<p>So by definition
119	</p>
120	<pre>
121	lookup3ycs(k,offset,length,initval) == lookup3(k,offset,length,initval-(length*4))
122
123	AND
124
125	lookup3ycs(k,offset,length,initval+(length*4)) == lookup3(k,offset,length,initval)
126	</pre>
127	<p>An obvious advantage of this relationship is that you can use lookup3 if you don't have an implementation of lookup3ycs.
128	</p>
129	<P>
130
131	<P>
132	<HR>
133
134	<P>
135
136	<!-- ======== CONSTRUCTOR SUMMARY ======== -->
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145	<TD><CODE><B><A HREF="../../../../../org/apache/solr/common/util/Hash.html#Hash()">Hash</A></B>()</CODE>
146
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162	<CODE>static int</CODE></FONT></TD>
163	<TD><CODE><B><A HREF="../../../../../org/apache/solr/common/util/Hash.html#lookup3(int[], int, int, int)">lookup3</A></B>(int[] k,
164	int offset,
165	int length,
166	int initval)</CODE>
167
168	<BR>
169	A Java implementation of hashword from lookup3.c by Bob Jenkins
170	(<a href="http://burtleburtle.net/bob/c/lookup3.c">original source</a>).</TD>
171	</TR>
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174	<CODE>static int</CODE></FONT></TD>
175	<TD><CODE><B><A HREF="../../../../../org/apache/solr/common/util/Hash.html#lookup3ycs(java.lang.CharSequence, int, int, int)">lookup3ycs</A></B>(<A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/CharSequence.html?is-external=true" title="class or interface in java.lang">CharSequence</A> s,
176	int start,
177	int end,
178	int initval)</CODE>
179
180	<BR>
181	The hash value of a character sequence is defined to be the hash of
182	it's unicode code points, according to <A HREF="../../../../../org/apache/solr/common/util/Hash.html#lookup3ycs(int[], int, int, int)"><CODE>lookup3ycs(int[] k, int offset, int length, int initval)</CODE></A></TD>
183	</TR>
184	<TR BGCOLOR="white" CLASS="TableRowColor">
185	<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
186	<CODE>static int</CODE></FONT></TD>
187	<TD><CODE><B><A HREF="../../../../../org/apache/solr/common/util/Hash.html#lookup3ycs(int[], int, int, int)">lookup3ycs</A></B>(int[] k,
188	int offset,
189	int length,
190	int initval)</CODE>
191
192	<BR>
193	Identical to lookup3, except initval is biased by -(length<<2).</TD>
194	</TR>
195	<TR BGCOLOR="white" CLASS="TableRowColor">
196	<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
197	<CODE>static long</CODE></FONT></TD>
198	<TD><CODE><B><A HREF="../../../../../org/apache/solr/common/util/Hash.html#lookup3ycs64(java.lang.CharSequence, int, int, long)">lookup3ycs64</A></B>(<A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/CharSequence.html?is-external=true" title="class or interface in java.lang">CharSequence</A> s,
199	int start,
200	int end,
201	long initval)</CODE>
202
203	<BR>
204	This is the 64 bit version of lookup3ycs, corresponding to Bob Jenkin's
205	lookup3 hashlittle2 with initval biased by -(numCodePoints<<2).</TD>
206	</TR>
207	<TR BGCOLOR="white" CLASS="TableRowColor">
208	<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
209	<CODE>static int</CODE></FONT></TD>
210	<TD><CODE><B><A HREF="../../../../../org/apache/solr/common/util/Hash.html#murmurhash3_x86_32(byte[], int, int, int)">murmurhash3_x86_32</A></B>(byte[] data,
211	int offset,
212	int len,
213	int seed)</CODE>
214
215	<BR>
216	Returns the MurmurHash3_x86_32 hash.</TD>
217	</TR>
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240
241	<A NAME="Hash()"><!-- --></A><H3>
242	Hash</H3>
243	<PRE>
244	public <B>Hash</B>()</PRE>
245	<DL>
246	</DL>
247
248	<!-- ============ METHOD DETAIL ========== -->
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257
258	<A NAME="lookup3(int[], int, int, int)"><!-- --></A><H3>
259	lookup3</H3>
260	<PRE>
261	public static int <B>lookup3</B>(int[] k,
262	int offset,
263	int length,
264	int initval)</PRE>
265	<DL>
266	<DD>A Java implementation of hashword from lookup3.c by Bob Jenkins
267	(<a href="http://burtleburtle.net/bob/c/lookup3.c">original source</a>).
268	<P>
269	<DD><DL>
270	<DT><B>Parameters:</B><DD><CODE>k</CODE> - the key to hash<DD><CODE>offset</CODE> - offset of the start of the key<DD><CODE>length</CODE> - length of the key<DD><CODE>initval</CODE> - initial value to fold into the hash
271	<DT><B>Returns:</B><DD>the 32 bit hash code</DL>
272	</DD>
273	</DL>
274	<HR>
275
276	<A NAME="lookup3ycs(int[], int, int, int)"><!-- --></A><H3>
277	lookup3ycs</H3>
278	<PRE>
279	public static int <B>lookup3ycs</B>(int[] k,
280	int offset,
281	int length,
282	int initval)</PRE>
283	<DL>
284	<DD>Identical to lookup3, except initval is biased by -(length<<2).
285	This is equivalent to leaving out the length factor in the initial state.
286	<code>lookup3ycs(k,offset,length,initval) == lookup3(k,offset,length,initval-(length<<2))</code>
287	and
288	<code>lookup3ycs(k,offset,length,initval+(length<<2)) == lookup3(k,offset,length,initval)</code>
289	<P>
290	<DD><DL>
291	</DL>
292	</DD>
293	</DL>
294	<HR>
295
296	<A NAME="lookup3ycs(java.lang.CharSequence, int, int, int)"><!-- --></A><H3>
297	lookup3ycs</H3>
298	<PRE>
299	public static int <B>lookup3ycs</B>(<A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/CharSequence.html?is-external=true" title="class or interface in java.lang">CharSequence</A> s,
300	int start,
301	int end,
302	int initval)</PRE>
303	<DL>
304	<DD><p>The hash value of a character sequence is defined to be the hash of
305	it's unicode code points, according to <A HREF="../../../../../org/apache/solr/common/util/Hash.html#lookup3ycs(int[], int, int, int)"><CODE>lookup3ycs(int[] k, int offset, int length, int initval)</CODE></A>
306	</p>
307	<p>If you know the number of code points in the <code>CharSequence</code>, you can
308	generate the same hash as the original lookup3
309	via <code>lookup3ycs(s, start, end, initval+(numCodePoints<<2))</code>
310	<P>
311	<DD><DL>
312	</DL>
313	</DD>
314	</DL>
315	<HR>
316
317	<A NAME="lookup3ycs64(java.lang.CharSequence, int, int, long)"><!-- --></A><H3>
318	lookup3ycs64</H3>
319	<PRE>
320	public static long <B>lookup3ycs64</B>(<A HREF="http://download.oracle.com/javase/6/docs/api/java/lang/CharSequence.html?is-external=true" title="class or interface in java.lang">CharSequence</A> s,
321	int start,
322	int end,
323	long initval)</PRE>
324	<DL>
325	<DD><p>This is the 64 bit version of lookup3ycs, corresponding to Bob Jenkin's
326	lookup3 hashlittle2 with initval biased by -(numCodePoints<<2). It is equivalent
327	to lookup3ycs in that if the high bits of initval==0, then the low bits of the
328	result will be the same as lookup3ycs.
329	</p>
330	<P>
331	<DD><DL>
332	</DL>
333	</DD>
334	</DL>
335	<HR>
336
337	<A NAME="murmurhash3_x86_32(byte[], int, int, int)"><!-- --></A><H3>
338	murmurhash3_x86_32</H3>
339	<PRE>
340	public static int <B>murmurhash3_x86_32</B>(byte[] data,
341	int offset,
342	int len,
343	int seed)</PRE>
344	<DL>
345	<DD>Returns the MurmurHash3_x86_32 hash.
346	Original source/tests at https://github.com/yonik/java_util/
347	<P>
348	<DD><DL>
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