Import BSDDB 4.7.25 (as of svn r89086)
This commit is contained in:
Zachary Ware
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docs/java/com/sleepycat/util/PackedInteger.html
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docs/java/com/sleepycat/util/PackedInteger.html
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<!-- Generated by javadoc (build 1.5.0) on Thu May 15 17:17:33 EDT 2008 -->
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PackedInteger (Oracle - Berkeley DB Java API)
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<TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM>
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<b>Berkeley DB</b><br><font size="-1"> version 4.7.25</font></EM>
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SUMMARY: NESTED | <A HREF="#field_summary">FIELD</A> | <A HREF="#constructor_summary">CONSTR</A> | <A HREF="#method_summary">METHOD</A></FONT></TD>
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com.sleepycat.util</FONT>
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<BR>
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Class PackedInteger</H2>
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<PRE>
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||||
<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html" title="class or interface in java.lang">java.lang.Object</A>
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<IMG SRC="../../../resources/inherit.gif" ALT="extended by "><B>com.sleepycat.util.PackedInteger</B>
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</PRE>
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<HR>
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<DL>
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<DT><PRE>public class <B>PackedInteger</B><DT>extends <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A></DL>
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</PRE>
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<P>
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Static methods for reading and writing packed integers.
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<p>Note that packed integers are not sorted naturally for a byte-by-byte
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comparison because they have a preceding length and are little endian;
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therefore, they are typically not used for keys.</p>
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<p>Values in the inclusive range [-119,119] are stored in a single byte.
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For values outside that range, the first byte stores the sign and the number
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of additional bytes. The additional bytes store (abs(value) - 119) as an
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unsigned little endian integer.</p>
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||||
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<p>To read and write packed integer values, call <A HREF="../../../com/sleepycat/util/PackedInteger.html#readInt(byte[], int)"><CODE>readInt(byte[], int)</CODE></A> and <A HREF="../../../com/sleepycat/util/PackedInteger.html#writeInt(byte[], int, int)"><CODE>writeInt(byte[], int, int)</CODE></A> or for long values <A HREF="../../../com/sleepycat/util/PackedInteger.html#readLong(byte[], int)"><CODE>readLong(byte[], int)</CODE></A> and <A HREF="../../../com/sleepycat/util/PackedInteger.html#writeLong(byte[], int, long)"><CODE>writeLong(byte[], int, long)</CODE></A>. To
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get the length of a packed integer without reading it, call <A HREF="../../../com/sleepycat/util/PackedInteger.html#getReadIntLength(byte[], int)"><CODE>getReadIntLength(byte[], int)</CODE></A> or <A HREF="../../../com/sleepycat/util/PackedInteger.html#getReadLongLength(byte[], int)"><CODE>getReadLongLength(byte[], int)</CODE></A>. To get the length of an
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||||
unpacked integer without writing it, call <A HREF="../../../com/sleepycat/util/PackedInteger.html#getWriteIntLength(int)"><CODE>getWriteIntLength(int)</CODE></A> or
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||||
<A HREF="../../../com/sleepycat/util/PackedInteger.html#getWriteLongLength(long)"><CODE>getWriteLongLength(long)</CODE></A>.</p>
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<p>Because the same packed format is used for int and long values, stored
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int values may be expanded to long values without introducing a format
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||||
incompatibility. You can treat previously stored packed int values as long
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||||
values by calling <A HREF="../../../com/sleepycat/util/PackedInteger.html#readLong(byte[], int)"><CODE>readLong(byte[], int)</CODE></A> and <A HREF="../../../com/sleepycat/util/PackedInteger.html#getReadLongLength(byte[], int)"><CODE>getReadLongLength(byte[], int)</CODE></A>.</p>
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<P>
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||||
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||||
<P>
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||||
<HR>
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||||
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||||
<P>
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<!-- =========== FIELD SUMMARY =========== -->
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||||
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||||
<A NAME="field_summary"><!-- --></A>
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<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
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<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
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<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
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<B>Field Summary</B></FONT></TH>
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</TR>
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||||
<TR BGCOLOR="white" CLASS="TableRowColor">
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||||
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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||||
<CODE>static int</CODE></FONT></TD>
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||||
<TD><CODE><B><A HREF="../../../com/sleepycat/util/PackedInteger.html#MAX_LENGTH">MAX_LENGTH</A></B></CODE>
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||||
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||||
<BR>
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||||
The maximum number of bytes needed to store an int value (5).</TD>
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||||
</TR>
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||||
<TR BGCOLOR="white" CLASS="TableRowColor">
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||||
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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||||
<CODE>static int</CODE></FONT></TD>
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||||
<TD><CODE><B><A HREF="../../../com/sleepycat/util/PackedInteger.html#MAX_LONG_LENGTH">MAX_LONG_LENGTH</A></B></CODE>
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||||
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||||
<BR>
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||||
The maximum number of bytes needed to store a long value (9).</TD>
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||||
</TR>
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||||
</TABLE>
|
||||
|
||||
<!-- ======== CONSTRUCTOR SUMMARY ======== -->
|
||||
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||||
<A NAME="constructor_summary"><!-- --></A>
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||||
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
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||||
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
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||||
<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
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||||
<B>Constructor Summary</B></FONT></TH>
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||||
</TR>
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||||
<TR BGCOLOR="white" CLASS="TableRowColor">
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||||
<TD><CODE><B><A HREF="../../../com/sleepycat/util/PackedInteger.html#PackedInteger()">PackedInteger</A></B>()</CODE>
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||||
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||||
<BR>
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||||
</TD>
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||||
</TR>
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||||
</TABLE>
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||||
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||||
<!-- ========== METHOD SUMMARY =========== -->
|
||||
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||||
<A NAME="method_summary"><!-- --></A>
|
||||
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
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<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
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||||
<TH ALIGN="left" COLSPAN="2"><FONT SIZE="+2">
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||||
<B>Method Summary</B></FONT></TH>
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||||
</TR>
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||||
<TR BGCOLOR="white" CLASS="TableRowColor">
|
||||
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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||||
<CODE>static int</CODE></FONT></TD>
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||||
<TD><CODE><B><A HREF="../../../com/sleepycat/util/PackedInteger.html#getReadIntLength(byte[], int)">getReadIntLength</A></B>(byte[] buf,
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||||
int off)</CODE>
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||||
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||||
<BR>
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||||
Returns the number of bytes that would be read by <A HREF="../../../com/sleepycat/util/PackedInteger.html#readInt(byte[], int)"><CODE>readInt(byte[], int)</CODE></A>.</TD>
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||||
</TR>
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||||
<TR BGCOLOR="white" CLASS="TableRowColor">
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||||
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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||||
<CODE>static int</CODE></FONT></TD>
|
||||
<TD><CODE><B><A HREF="../../../com/sleepycat/util/PackedInteger.html#getReadLongLength(byte[], int)">getReadLongLength</A></B>(byte[] buf,
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||||
int off)</CODE>
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||||
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||||
<BR>
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||||
Returns the number of bytes that would be read by <A HREF="../../../com/sleepycat/util/PackedInteger.html#readLong(byte[], int)"><CODE>readLong(byte[], int)</CODE></A>.</TD>
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||||
</TR>
|
||||
<TR BGCOLOR="white" CLASS="TableRowColor">
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||||
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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||||
<CODE>static int</CODE></FONT></TD>
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||||
<TD><CODE><B><A HREF="../../../com/sleepycat/util/PackedInteger.html#getWriteIntLength(int)">getWriteIntLength</A></B>(int value)</CODE>
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||||
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||||
<BR>
|
||||
Returns the number of bytes that would be written by <A HREF="../../../com/sleepycat/util/PackedInteger.html#writeInt(byte[], int, int)"><CODE>writeInt(byte[], int, int)</CODE></A>.</TD>
|
||||
</TR>
|
||||
<TR BGCOLOR="white" CLASS="TableRowColor">
|
||||
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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||||
<CODE>static int</CODE></FONT></TD>
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||||
<TD><CODE><B><A HREF="../../../com/sleepycat/util/PackedInteger.html#getWriteLongLength(long)">getWriteLongLength</A></B>(long value)</CODE>
|
||||
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||||
<BR>
|
||||
Returns the number of bytes that would be written by <A HREF="../../../com/sleepycat/util/PackedInteger.html#writeLong(byte[], int, long)"><CODE>writeLong(byte[], int, long)</CODE></A>.</TD>
|
||||
</TR>
|
||||
<TR BGCOLOR="white" CLASS="TableRowColor">
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||||
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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||||
<CODE>static int</CODE></FONT></TD>
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||||
<TD><CODE><B><A HREF="../../../com/sleepycat/util/PackedInteger.html#readInt(byte[], int)">readInt</A></B>(byte[] buf,
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||||
int off)</CODE>
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||||
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||||
<BR>
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||||
Reads a packed integer at the given buffer offset and returns it.</TD>
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||||
</TR>
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||||
<TR BGCOLOR="white" CLASS="TableRowColor">
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||||
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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||||
<CODE>static long</CODE></FONT></TD>
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||||
<TD><CODE><B><A HREF="../../../com/sleepycat/util/PackedInteger.html#readLong(byte[], int)">readLong</A></B>(byte[] buf,
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||||
int off)</CODE>
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||||
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||||
<BR>
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||||
Reads a packed long integer at the given buffer offset and returns it.</TD>
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||||
</TR>
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||||
<TR BGCOLOR="white" CLASS="TableRowColor">
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||||
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
|
||||
<CODE>static int</CODE></FONT></TD>
|
||||
<TD><CODE><B><A HREF="../../../com/sleepycat/util/PackedInteger.html#writeInt(byte[], int, int)">writeInt</A></B>(byte[] buf,
|
||||
int offset,
|
||||
int value)</CODE>
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||||
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||||
<BR>
|
||||
Writes a packed integer starting at the given buffer offset and returns
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||||
the next offset to be written.</TD>
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||||
</TR>
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||||
<TR BGCOLOR="white" CLASS="TableRowColor">
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||||
<TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1">
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||||
<CODE>static int</CODE></FONT></TD>
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||||
<TD><CODE><B><A HREF="../../../com/sleepycat/util/PackedInteger.html#writeLong(byte[], int, long)">writeLong</A></B>(byte[] buf,
|
||||
int offset,
|
||||
long value)</CODE>
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||||
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||||
<BR>
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||||
Writes a packed long integer starting at the given buffer offset and
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returns the next offset to be written.</TD>
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||||
</TR>
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||||
</TABLE>
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||||
<A NAME="methods_inherited_from_class_java.lang.Object"><!-- --></A>
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||||
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
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||||
<TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor">
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||||
<TH ALIGN="left"><B>Methods inherited from class java.lang.<A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html" title="class or interface in java.lang">Object</A></B></TH>
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||||
</TR>
|
||||
<TR BGCOLOR="white" CLASS="TableRowColor">
|
||||
<TD><CODE><A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html#clone()" title="class or interface in java.lang">clone</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html#equals(java.lang.Object)" title="class or interface in java.lang">equals</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html#finalize()" title="class or interface in java.lang">finalize</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html#getClass()" title="class or interface in java.lang">getClass</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html#hashCode()" title="class or interface in java.lang">hashCode</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html#notify()" title="class or interface in java.lang">notify</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html#notifyAll()" title="class or interface in java.lang">notifyAll</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html#toString()" title="class or interface in java.lang">toString</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html#wait()" title="class or interface in java.lang">wait</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html#wait(long)" title="class or interface in java.lang">wait</A>, <A HREF="http://java.sun.com/j2se/1.5.0/docs/api/java/lang/Object.html#wait(long, int)" title="class or interface in java.lang">wait</A></CODE></TD>
|
||||
</TR>
|
||||
</TABLE>
|
||||
|
||||
<P>
|
||||
|
||||
<!-- ============ FIELD DETAIL =========== -->
|
||||
|
||||
<A NAME="field_detail"><!-- --></A>
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||||
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
|
||||
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
|
||||
<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
|
||||
<B>Field Detail</B></FONT></TH>
|
||||
</TR>
|
||||
</TABLE>
|
||||
|
||||
<A NAME="MAX_LENGTH"><!-- --></A><H3>
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||||
MAX_LENGTH</H3>
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||||
<PRE>
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||||
public static final int <B>MAX_LENGTH</B></PRE>
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<DL>
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||||
<DD>The maximum number of bytes needed to store an int value (5).
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||||
<P>
|
||||
<DL>
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||||
<DT><B>See Also:</B><DD><A HREF="../../../constant-values.html#com.sleepycat.util.PackedInteger.MAX_LENGTH">Constant Field Values</A></DL>
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||||
</DL>
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||||
<HR>
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||||
|
||||
<A NAME="MAX_LONG_LENGTH"><!-- --></A><H3>
|
||||
MAX_LONG_LENGTH</H3>
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||||
<PRE>
|
||||
public static final int <B>MAX_LONG_LENGTH</B></PRE>
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<DL>
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||||
<DD>The maximum number of bytes needed to store a long value (9).
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||||
<P>
|
||||
<DL>
|
||||
<DT><B>See Also:</B><DD><A HREF="../../../constant-values.html#com.sleepycat.util.PackedInteger.MAX_LONG_LENGTH">Constant Field Values</A></DL>
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||||
</DL>
|
||||
|
||||
<!-- ========= CONSTRUCTOR DETAIL ======== -->
|
||||
|
||||
<A NAME="constructor_detail"><!-- --></A>
|
||||
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
|
||||
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
|
||||
<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
|
||||
<B>Constructor Detail</B></FONT></TH>
|
||||
</TR>
|
||||
</TABLE>
|
||||
|
||||
<A NAME="PackedInteger()"><!-- --></A><H3>
|
||||
PackedInteger</H3>
|
||||
<PRE>
|
||||
public <B>PackedInteger</B>()</PRE>
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||||
<DL>
|
||||
</DL>
|
||||
|
||||
<!-- ============ METHOD DETAIL ========== -->
|
||||
|
||||
<A NAME="method_detail"><!-- --></A>
|
||||
<TABLE BORDER="1" WIDTH="100%" CELLPADDING="3" CELLSPACING="0" SUMMARY="">
|
||||
<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
|
||||
<TH ALIGN="left" COLSPAN="1"><FONT SIZE="+2">
|
||||
<B>Method Detail</B></FONT></TH>
|
||||
</TR>
|
||||
</TABLE>
|
||||
|
||||
<A NAME="readInt(byte[], int)"><!-- --></A><H3>
|
||||
readInt</H3>
|
||||
<PRE>
|
||||
public static int <B>readInt</B>(byte[] buf,
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||||
int off)</PRE>
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||||
<DL>
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||||
<DD>Reads a packed integer at the given buffer offset and returns it.
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||||
<P>
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||||
<DD><DL>
|
||||
<DT><B>Parameters:</B><DD><CODE>buf</CODE> - the buffer to read from.<DD><CODE>off</CODE> - the offset in the buffer at which to start reading.
|
||||
<DT><B>Returns:</B><DD>the integer that was read.</DL>
|
||||
</DD>
|
||||
</DL>
|
||||
<HR>
|
||||
|
||||
<A NAME="readLong(byte[], int)"><!-- --></A><H3>
|
||||
readLong</H3>
|
||||
<PRE>
|
||||
public static long <B>readLong</B>(byte[] buf,
|
||||
int off)</PRE>
|
||||
<DL>
|
||||
<DD>Reads a packed long integer at the given buffer offset and returns it.
|
||||
<P>
|
||||
<DD><DL>
|
||||
<DT><B>Parameters:</B><DD><CODE>buf</CODE> - the buffer to read from.<DD><CODE>off</CODE> - the offset in the buffer at which to start reading.
|
||||
<DT><B>Returns:</B><DD>the long integer that was read.</DL>
|
||||
</DD>
|
||||
</DL>
|
||||
<HR>
|
||||
|
||||
<A NAME="getReadIntLength(byte[], int)"><!-- --></A><H3>
|
||||
getReadIntLength</H3>
|
||||
<PRE>
|
||||
public static int <B>getReadIntLength</B>(byte[] buf,
|
||||
int off)</PRE>
|
||||
<DL>
|
||||
<DD>Returns the number of bytes that would be read by <A HREF="../../../com/sleepycat/util/PackedInteger.html#readInt(byte[], int)"><CODE>readInt(byte[], int)</CODE></A>.
|
||||
|
||||
<p>Because the length is stored in the first byte, this method may be
|
||||
called with only the first byte of the packed integer in the given
|
||||
buffer. This method only accesses one byte at the given offset.</p>
|
||||
<P>
|
||||
<DD><DL>
|
||||
<DT><B>Parameters:</B><DD><CODE>buf</CODE> - the buffer to read from.<DD><CODE>off</CODE> - the offset in the buffer at which to start reading.
|
||||
<DT><B>Returns:</B><DD>the number of bytes that would be read.</DL>
|
||||
</DD>
|
||||
</DL>
|
||||
<HR>
|
||||
|
||||
<A NAME="getReadLongLength(byte[], int)"><!-- --></A><H3>
|
||||
getReadLongLength</H3>
|
||||
<PRE>
|
||||
public static int <B>getReadLongLength</B>(byte[] buf,
|
||||
int off)</PRE>
|
||||
<DL>
|
||||
<DD>Returns the number of bytes that would be read by <A HREF="../../../com/sleepycat/util/PackedInteger.html#readLong(byte[], int)"><CODE>readLong(byte[], int)</CODE></A>.
|
||||
|
||||
<p>Because the length is stored in the first byte, this method may be
|
||||
called with only the first byte of the packed integer in the given
|
||||
buffer. This method only accesses one byte at the given offset.</p>
|
||||
<P>
|
||||
<DD><DL>
|
||||
<DT><B>Parameters:</B><DD><CODE>buf</CODE> - the buffer to read from.<DD><CODE>off</CODE> - the offset in the buffer at which to start reading.
|
||||
<DT><B>Returns:</B><DD>the number of bytes that would be read.</DL>
|
||||
</DD>
|
||||
</DL>
|
||||
<HR>
|
||||
|
||||
<A NAME="writeInt(byte[], int, int)"><!-- --></A><H3>
|
||||
writeInt</H3>
|
||||
<PRE>
|
||||
public static int <B>writeInt</B>(byte[] buf,
|
||||
int offset,
|
||||
int value)</PRE>
|
||||
<DL>
|
||||
<DD>Writes a packed integer starting at the given buffer offset and returns
|
||||
the next offset to be written.
|
||||
<P>
|
||||
<DD><DL>
|
||||
<DT><B>Parameters:</B><DD><CODE>buf</CODE> - the buffer to write to.<DD><CODE>offset</CODE> - the offset in the buffer at which to start writing.<DD><CODE>value</CODE> - the integer to be written.
|
||||
<DT><B>Returns:</B><DD>the offset past the bytes written.</DL>
|
||||
</DD>
|
||||
</DL>
|
||||
<HR>
|
||||
|
||||
<A NAME="writeLong(byte[], int, long)"><!-- --></A><H3>
|
||||
writeLong</H3>
|
||||
<PRE>
|
||||
public static int <B>writeLong</B>(byte[] buf,
|
||||
int offset,
|
||||
long value)</PRE>
|
||||
<DL>
|
||||
<DD>Writes a packed long integer starting at the given buffer offset and
|
||||
returns the next offset to be written.
|
||||
<P>
|
||||
<DD><DL>
|
||||
<DT><B>Parameters:</B><DD><CODE>buf</CODE> - the buffer to write to.<DD><CODE>offset</CODE> - the offset in the buffer at which to start writing.<DD><CODE>value</CODE> - the long integer to be written.
|
||||
<DT><B>Returns:</B><DD>the offset past the bytes written.</DL>
|
||||
</DD>
|
||||
</DL>
|
||||
<HR>
|
||||
|
||||
<A NAME="getWriteIntLength(int)"><!-- --></A><H3>
|
||||
getWriteIntLength</H3>
|
||||
<PRE>
|
||||
public static int <B>getWriteIntLength</B>(int value)</PRE>
|
||||
<DL>
|
||||
<DD>Returns the number of bytes that would be written by <A HREF="../../../com/sleepycat/util/PackedInteger.html#writeInt(byte[], int, int)"><CODE>writeInt(byte[], int, int)</CODE></A>.
|
||||
<P>
|
||||
<DD><DL>
|
||||
<DT><B>Parameters:</B><DD><CODE>value</CODE> - the integer to be written.
|
||||
<DT><B>Returns:</B><DD>the number of bytes that would be used to write the given
|
||||
integer.</DL>
|
||||
</DD>
|
||||
</DL>
|
||||
<HR>
|
||||
|
||||
<A NAME="getWriteLongLength(long)"><!-- --></A><H3>
|
||||
getWriteLongLength</H3>
|
||||
<PRE>
|
||||
public static int <B>getWriteLongLength</B>(long value)</PRE>
|
||||
<DL>
|
||||
<DD>Returns the number of bytes that would be written by <A HREF="../../../com/sleepycat/util/PackedInteger.html#writeLong(byte[], int, long)"><CODE>writeLong(byte[], int, long)</CODE></A>.
|
||||
<P>
|
||||
<DD><DL>
|
||||
<DT><B>Parameters:</B><DD><CODE>value</CODE> - the long integer to be written.
|
||||
<DT><B>Returns:</B><DD>the number of bytes that would be used to write the given long
|
||||
integer.</DL>
|
||||
</DD>
|
||||
</DL>
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<b>Berkeley DB</b><br><font size="-1"> version 4.7.25</font></EM>
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