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<div class="subTitle">com.sleepycat.db</div>
<h2 title="Class DatabaseEntry" class="title">Class DatabaseEntry</h2>
</div>
<div class="contentContainer">
<ul class="inheritance">
<li>java.lang.Object</li>
<li>
<ul class="inheritance">
<li>com.sleepycat.db.DatabaseEntry</li>
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<dd><a href="../../../com/sleepycat/db/MultipleEntry.html" title="class in com.sleepycat.db">MultipleEntry</a></dd>
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<pre>public class <span class="strong">DatabaseEntry</span>
extends java.lang.Object</pre>
<div class="block">Encodes database key and data items as a byte array.
<p>
Storage and retrieval for the <a href="../../../com/sleepycat/db/Database.html" title="class in com.sleepycat.db"><code>Database</code></a> and <a href="../../../com/sleepycat/db/Cursor.html" title="class in com.sleepycat.db"><code>Cursor</code></a> methods
are based on key/data pairs. Both key and data items are represented by
DatabaseEntry objects. Key and data byte arrays may refer to arrays of zero
length up to arrays of essentially unlimited length.
<p>
The DatabaseEntry class provides simple access to an underlying object whose
elements can be examined or changed. DatabaseEntry objects can be
subclassed, providing a way to associate with it additional data or
references to other structures.
<p>
Access to DatabaseEntry objects is not re-entrant. In particular, if
multiple threads simultaneously access the same DatabaseEntry object using
<a href="../../../com/sleepycat/db/Database.html" title="class in com.sleepycat.db"><code>Database</code></a> or <a href="../../../com/sleepycat/db/Cursor.html" title="class in com.sleepycat.db"><code>Cursor</code></a> methods, the results are undefined.
<p>
DatabaseEntry objects may be used in conjunction with the object mapping
support provided in the <a href="../../../com/sleepycat/bind/package-summary.html"><code>com.sleepycat.bind</code></a> package.
<p>
<h3>Input and Output Parameters</h3>
<p>
DatabaseEntry objects are used for both input data (when writing to a
database or specifying a search parameter) and output data (when reading
from a database). For certain methods, one parameter may be an input
parameter and another may be an output parameter. For example, the
<a href="../../../com/sleepycat/db/Database.html#get(com.sleepycat.db.Transaction,%20com.sleepycat.db.DatabaseEntry,%20com.sleepycat.db.DatabaseEntry,%20com.sleepycat.db.LockMode)"><code>Database.get(com.sleepycat.db.Transaction, com.sleepycat.db.DatabaseEntry, com.sleepycat.db.DatabaseEntry, com.sleepycat.db.LockMode)</code></a> method has an input key parameter and an output
data parameter. The documentation for each method describes whether its
parameters are input or output parameters.
<p>
For DatabaseEntry input parameters, the caller is responsible for
initializing the data array of the DatabaseEntry. For DatabaseEntry
output parameters, the method called will initialize the data array.
<p>
For DatabaseEntry output parameters, by default the method called will
reuse the byte array in the DatabaseEntry, if the data returned fits in
the byte array. This behavior can be configured with <a href="../../../com/sleepycat/db/DatabaseEntry.html#setReuseBuffer(boolean)"><code>setReuseBuffer(boolean)</code></a> or <a href="../../../com/sleepycat/db/DatabaseEntry.html#setUserBuffer(int,%20boolean)"><code>setUserBuffer(int, boolean)</code></a>. If an entry is configured to
reuse the byte array (the default behavior), the length of the underlying
byte array should not be used to determine the amount of data returned each
time the entry is used as an output parameter, rather the <a href="../../../com/sleepycat/db/DatabaseEntry.html#getSize()"><code>getSize()</code></a>
call should be used. If an entry is configured to not reuse the byte array,
a new array is allocated each time the entry is used as an output parameter,
so
the application can safely keep a reference to the byte array returned
by <a href="../../../com/sleepycat/db/DatabaseEntry.html#getData()"><code>getData()</code></a> without danger that the array will be overwritten in
a subsequent call.
<p>
<h3>Offset and Size Properties</h3>
<p>
By default the Offset property is zero and the Size property is the length
of the byte array. However, to allow for optimizations involving the
partial use of a byte array, the Offset and Size may be set to non-default
values.
<p>
For DatabaseEntry output parameters, the Size will always be set to the
length of the returned data and
the Offset will always be set to zero.
<p>
However, for DatabaseEntry input parameters the Offset and Size are set to
non-default values by the built-in tuple and serial bindings. For example,
with a tuple or serial binding the byte array is grown dynamically as data
is output, and the Size is set to the number of bytes actually used. For a
serial binding, the Offset is set to a non-zero value in order to implement
an optimization having to do with the serialization stream header.
<p>
Therefore, for output DatabaseEntry parameters the application can assume
that the Offset is zero and the Size is the length of the byte array.
However, for input DatabaseEntry parameters the application should not make
this assumption. In general, it is safest for the application to always
honor the Size and Offset properties, rather than assuming they have default
values.
<p>
<h3>Partial Offset and Length Properties</h3>
<p>
By default the specified data (byte array, offset and size) corresponds to
the full stored key or data item. Optionally, the Partial property can be
set to true, and the PartialOffset and PartialLength properties are used to
specify the portion of the key or data item to be read or written. For
details, see the <a href="../../../com/sleepycat/db/DatabaseEntry.html#setPartial(int,%20int,%20boolean)"><code>setPartial(int,int,boolean)</code></a> method.
<p>
Note that the Partial properties are set only by the caller. They will
never be set by a Database or Cursor method, nor will they every be set by
bindings. Therefore, the application can assume that the Partial properties
are not set, unless the application itself sets them explicitly.</div>
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<h3>Constructor Summary</h3>
<table class="overviewSummary" border="0" cellpadding="3" cellspacing="0" summary="Constructor Summary table, listing constructors, and an explanation">
<caption><span>Constructors</span><span class="tabEnd"> </span></caption>
<tr>
<th class="colOne" scope="col">Constructor and Description</th>
</tr>
<tr class="altColor">
<td class="colOne"><code><strong><a href="../../../com/sleepycat/db/DatabaseEntry.html#DatabaseEntry()">DatabaseEntry</a></strong>()</code>
<div class="block">Construct a DatabaseEntry with null data.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><code><strong><a href="../../../com/sleepycat/db/DatabaseEntry.html#DatabaseEntry(byte[])">DatabaseEntry</a></strong>(byte[] data)</code>
<div class="block">Construct a DatabaseEntry with a given byte array.</div>
</td>
</tr>
<tr class="altColor">
<td class="colOne"><code><strong><a href="../../../com/sleepycat/db/DatabaseEntry.html#DatabaseEntry(byte[],%20int,%20int)">DatabaseEntry</a></strong>(byte[] data,
int offset,
int size)</code>
<div class="block">Constructs a DatabaseEntry with a given byte array, offset and size.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colOne"><code><strong><a href="../../../com/sleepycat/db/DatabaseEntry.html#DatabaseEntry(java.nio.ByteBuffer)">DatabaseEntry</a></strong>(java.nio.ByteBuffer data)</code>
<div class="block">Construct a DatabaseEntry with a given native I/O buffer.</div>
</td>
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<h3>Method Summary</h3>
<table class="overviewSummary" border="0" cellpadding="3" cellspacing="0" summary="Method Summary table, listing methods, and an explanation">
<caption><span>Methods</span><span class="tabEnd"> </span></caption>
<tr>
<th class="colFirst" scope="col">Modifier and Type</th>
<th class="colLast" scope="col">Method and Description</th>
</tr>
<tr class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/DatabaseEntry.html#equals(java.lang.Object)">equals</a></strong>(java.lang.Object o)</code>
<div class="block">Compares the data of two entries for byte-by-byte equality.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/DatabaseEntry.html#getBlob()">getBlob</a></strong>()</code>
<div class="block">Return whether this DatabaseEntry is configured to be stored as a blob.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>byte[]</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/DatabaseEntry.html#getData()">getData</a></strong>()</code>
<div class="block">Return the byte array.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>java.nio.ByteBuffer</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/DatabaseEntry.html#getDataNIO()">getDataNIO</a></strong>()</code>
<div class="block">Return the java.nio.ByteBuffer.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/DatabaseEntry.html#getOffset()">getOffset</a></strong>()</code>
<div class="block">Return the byte offset into the data array.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/DatabaseEntry.html#getPartial()">getPartial</a></strong>()</code>
<div class="block">Return whether this DatabaseEntry is configured to read or write partial
records.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/DatabaseEntry.html#getPartialLength()">getPartialLength</a></strong>()</code>
<div class="block">Return the byte length of the partial record being read or written by
the application, in bytes.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/DatabaseEntry.html#getPartialOffset()">getPartialOffset</a></strong>()</code>
<div class="block">Return the offset of the partial record being read or written by the
application, in bytes.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/DatabaseEntry.html#getReadOnly()">getReadOnly</a></strong>()</code>
<div class="block">Return whether this DatabaseEntry is configured as read only.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/DatabaseEntry.html#getRecordNumber()">getRecordNumber</a></strong>()</code>
<div class="block">Return the record number encoded in this entry's buffer.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/DatabaseEntry.html#getReuseBuffer()">getReuseBuffer</a></strong>()</code>
<div class="block">Return true if the whether the entry is configured to reuse the buffer.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/DatabaseEntry.html#getSize()">getSize</a></strong>()</code>
<div class="block">Return the byte size of the data array.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/DatabaseEntry.html#getUserBuffer()">getUserBuffer</a></strong>()</code>
<div class="block">Return true if the whether the buffer in this entry is owned by the
application.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/DatabaseEntry.html#getUserBufferLength()">getUserBufferLength</a></strong>()</code>
<div class="block">Return the length of the application's buffer.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>int</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/DatabaseEntry.html#hashCode()">hashCode</a></strong>()</code>
<div class="block">Returns a hash code based on the data value.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/DatabaseEntry.html#setBlob(boolean)">setBlob</a></strong>(boolean blob)</code>
<div class="block">Configure this DatabaseEntry to be stored as a blob.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/DatabaseEntry.html#setData(byte[])">setData</a></strong>(byte[] data)</code>
<div class="block">Sets the byte array.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/DatabaseEntry.html#setData(byte[],%20int,%20int)">setData</a></strong>(byte[] data,
int offset,
int size)</code>
<div class="block">Sets the byte array, offset and size.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/DatabaseEntry.html#setDataNIO(java.nio.ByteBuffer)">setDataNIO</a></strong>(java.nio.ByteBuffer data)</code>
<div class="block">Sets the java.nio.ByteBuffer.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/DatabaseEntry.html#setDataNIO(java.nio.ByteBuffer,%20int,%20int)">setDataNIO</a></strong>(java.nio.ByteBuffer data,
int offset,
int size)</code>
<div class="block">Sets the java.nio.ByteBuffer (or the backing array if passed a non-direct
ByteBuffer,) offset and size.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/DatabaseEntry.html#setOffset(int)">setOffset</a></strong>(int offset)</code>
<div class="block">Set the byte offset into the data array.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/DatabaseEntry.html#setPartial(boolean)">setPartial</a></strong>(boolean partial)</code>
<div class="block">Configure this DatabaseEntry to read or write partial records.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/DatabaseEntry.html#setPartial(int,%20int,%20boolean)">setPartial</a></strong>(int doff,
int dlen,
boolean partial)</code>
<div class="block">Configures this DatabaseEntry to read or write partial records.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/DatabaseEntry.html#setPartialLength(int)">setPartialLength</a></strong>(int dlen)</code>
<div class="block">Set the byte length of the partial record being read or written by
the application, in bytes.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/DatabaseEntry.html#setPartialOffset(int)">setPartialOffset</a></strong>(int doff)</code>
<div class="block">Set the offset of the partial record being read or written by the
application, in bytes.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/DatabaseEntry.html#setReadOnly(boolean)">setReadOnly</a></strong>(boolean readonly)</code>
<div class="block">Configure this DatabaseEntry as read only.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/DatabaseEntry.html#setRecordNumber(int)">setRecordNumber</a></strong>(int recno)</code>
<div class="block">Initialize the entry from a logical record number.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/DatabaseEntry.html#setReuseBuffer(boolean)">setReuseBuffer</a></strong>(boolean reuse)</code>
<div class="block">Configures the entry to try to reuse the buffer before allocating a new
one.</div>
</td>
</tr>
<tr class="altColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/DatabaseEntry.html#setSize(int)">setSize</a></strong>(int size)</code>
<div class="block">Set the byte size of the data array.</div>
</td>
</tr>
<tr class="rowColor">
<td class="colFirst"><code>void</code></td>
<td class="colLast"><code><strong><a href="../../../com/sleepycat/db/DatabaseEntry.html#setUserBuffer(int,%20boolean)">setUserBuffer</a></strong>(int length,
boolean usermem)</code>
<div class="block">Configures the entry with an application-owned buffer.</div>
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<h3>Methods inherited from class java.lang.Object</h3>
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<h3>Constructor Detail</h3>
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<h4>DatabaseEntry</h4>
<pre>public DatabaseEntry()</pre>
<div class="block">Construct a DatabaseEntry with null data. The offset and size are set to
zero.</div>
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<h4>DatabaseEntry</h4>
<pre>public DatabaseEntry(byte[] data)</pre>
<div class="block">Construct a DatabaseEntry with a given byte array. The offset is
set to zero; the size is set to the length of the array, or to zero if
null is passed.
<p></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>data</code> - Byte array wrapped by the DatabaseEntry.</dd></dl>
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<h4>DatabaseEntry</h4>
<pre>public DatabaseEntry(byte[] data,
int offset,
int size)</pre>
<div class="block">Constructs a DatabaseEntry with a given byte array, offset and size.
<p></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>data</code> - Byte array wrapped by the DatabaseEntry.</dd><dd><code>offset</code> - Offset in the first byte in the byte array to be included.</dd><dd><code>size</code> - Number of bytes in the byte array to be included.</dd></dl>
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<pre>public DatabaseEntry(java.nio.ByteBuffer data)</pre>
<div class="block">Construct a DatabaseEntry with a given native I/O buffer. If the buffer is
non-direct, the buffer's backing array is used. If the buffer is direct,
the DatabaseEntry is configured with an application-owned buffer whose
length is set to the ByteBuffer's capacity less its position. The
DatabaseEntry's size is set to the ByteBuffer's limit less its position and
the offset is set to buffer's position (adjusted by arrayOffset if the
buffer is non-direct.)
<p></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>data</code> - NIO byte buffer wrapped by the DatabaseEntry.</dd></dl>
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<h4>setBlob</h4>
<pre>public void setBlob(boolean blob)</pre>
<div class="block">Configure this DatabaseEntry to be stored as a blob.
<p></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>blob</code> - Whether this DatabaseEntry is configured to be stored as a blob.</dd></dl>
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<pre>public boolean getBlob()</pre>
<div class="block">Return whether this DatabaseEntry is configured to be stored as a blob.
<p></div>
<dl><dt><span class="strong">Returns:</span></dt><dd>Whether this DatabaseEntry is configured to be stored as a blob.</dd></dl>
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<h4>getData</h4>
<pre>public byte[] getData()</pre>
<div class="block">Return the byte array.
<p>
For a DatabaseEntry that is used as an output parameter, the byte
array will always be a newly allocated array. The byte array specified
by the caller will not be used and may be null.
<p></div>
<dl><dt><span class="strong">Returns:</span></dt><dd>The byte array.</dd></dl>
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<pre>public java.nio.ByteBuffer getDataNIO()</pre>
<div class="block">Return the java.nio.ByteBuffer.
<p>
Used to access the underlying data when the DatabaseEntry is
configured to utilize a java.nio.ByteBuffer.
<p></div>
<dl><dt><span class="strong">Returns:</span></dt><dd>The underlying java.nio.ByteBuffer.</dd></dl>
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<h4>setData</h4>
<pre>public void setData(byte[] data,
int offset,
int size)</pre>
<div class="block">Sets the byte array, offset and size.
<p></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>data</code> - Byte array wrapped by the DatabaseEntry.</dd><dd><code>offset</code> - Offset in the first byte in the byte array to be included.</dd><dd><code>size</code> - Number of bytes in the byte array to be included.</dd></dl>
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<pre>public void setData(byte[] data)</pre>
<div class="block">Sets the byte array. The offset is set to zero; the size is set to the
length of the array, or to zero if null is passed.
<p></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>data</code> - Byte array wrapped by the DatabaseEntry.</dd></dl>
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<pre>public void setDataNIO(java.nio.ByteBuffer data,
int offset,
int size)</pre>
<div class="block">Sets the java.nio.ByteBuffer (or the backing array if passed a non-direct
ByteBuffer,) offset and size. If passed a direct ByteBuffer, the entry is
configured with an application-owned buffer whose length is set to the
ByteBuffer's capacity less the offset.
<p></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>data</code> - java.nio.ByteBuffer wrapped by the DatabaseEntry.</dd><dd><code>offset</code> - int offset into the ByteBuffer where the DatabaseEntry data begins.</dd><dd><code>size</code> - int size of the ByteBuffer available.</dd></dl>
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<pre>public void setDataNIO(java.nio.ByteBuffer data)</pre>
<div class="block">Sets the java.nio.ByteBuffer. The offset is set to the ByteBuffer's
position; the size is set to the ByteBuffer's limit less its position, or to
zero if null is passed. If the ByteBuffer is non-direct, the backing array
will be used. If passed a direct ByteBuffer, the entry is configured with
an application-owned buffer whose length is set to the ByteBuffer's capacity
less its current position. No call to <a href="../../../com/sleepycat/db/DatabaseEntry.html#setUserBuffer(int,%20boolean)"><code>setUserBuffer(int, boolean)</code></a> is required
after setting the ByteBuffer.
<p></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>data</code> - java.nio.ByteBuffer wrapped by the DatabaseEntry.</dd></dl>
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<h4>getOffset</h4>
<pre>public int getOffset()</pre>
<div class="block">Return the byte offset into the data array.
<p>
For a DatabaseEntry that is used as an output parameter, the offset
will always be zero.
<p></div>
<dl><dt><span class="strong">Returns:</span></dt><dd>Offset in the first byte in the byte array to be included.</dd></dl>
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<h4>setOffset</h4>
<pre>public void setOffset(int offset)</pre>
<div class="block">Set the byte offset into the data array.
<p></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>offset</code> - Offset in the first byte in the byte array to be included.</dd></dl>
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<h4>getPartialLength</h4>
<pre>public int getPartialLength()</pre>
<div class="block">Return the byte length of the partial record being read or written by
the application, in bytes.
<p>
Note that the Partial properties are set only by the caller. They
will never be set by a Database or Cursor method.
<p></div>
<dl><dt><span class="strong">Returns:</span></dt><dd>The byte length of the partial record being read or written by the
application, in bytes.
<p></dd><dt><span class="strong">See Also:</span></dt><dd><a href="../../../com/sleepycat/db/DatabaseEntry.html#setPartial(int,%20int,%20boolean)"><code>setPartial(int,int,boolean)</code></a></dd></dl>
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<pre>public int getPartialOffset()</pre>
<div class="block">Return the offset of the partial record being read or written by the
application, in bytes.
<p>
Note that the Partial properties are set only by the caller. They
will never be set by a Database or Cursor method.
<p></div>
<dl><dt><span class="strong">Returns:</span></dt><dd>The offset of the partial record being read or written by the
application, in bytes.
<p></dd><dt><span class="strong">See Also:</span></dt><dd><a href="../../../com/sleepycat/db/DatabaseEntry.html#setPartial(int,%20int,%20boolean)"><code>setPartial(int,int,boolean)</code></a></dd></dl>
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<pre>public boolean getPartial()</pre>
<div class="block">Return whether this DatabaseEntry is configured to read or write partial
records.
<p>
Note that the Partial properties are set only by the caller. They
will never be set by a Database or Cursor method.
<p></div>
<dl><dt><span class="strong">Returns:</span></dt><dd>Whether this DatabaseEntry is configured to read or write partial
records.
<p></dd><dt><span class="strong">See Also:</span></dt><dd><a href="../../../com/sleepycat/db/DatabaseEntry.html#setPartial(int,%20int,%20boolean)"><code>setPartial(int,int,boolean)</code></a></dd></dl>
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<pre>public void setPartialOffset(int doff)</pre>
<div class="block">Set the offset of the partial record being read or written by the
application, in bytes.
<p>
Note that the Partial properties are set only by the caller. They
will never be set by a Database or Cursor method.
<p></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>doff</code> - The offset of the partial record being read or written by the
application, in bytes.
<p></dd><dt><span class="strong">See Also:</span></dt><dd><a href="../../../com/sleepycat/db/DatabaseEntry.html#setPartial(int,%20int,%20boolean)"><code>setPartial(int,int,boolean)</code></a></dd></dl>
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<pre>public void setPartialLength(int dlen)</pre>
<div class="block">Set the byte length of the partial record being read or written by
the application, in bytes.
<p>
Note that the Partial properties are set only by the caller. They
will never be set by a Database or Cursor method.
<p></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>dlen</code> - The byte length of the partial record being read or written by the
<p></dd><dt><span class="strong">See Also:</span></dt><dd><a href="../../../com/sleepycat/db/DatabaseEntry.html#setPartial(int,%20int,%20boolean)"><code>application, in bytes.</code></a></dd></dl>
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<pre>public void setPartial(boolean partial)</pre>
<div class="block">Configure this DatabaseEntry to read or write partial records.
<p>
Note that the Partial properties are set only by the caller. They
will never be set by a Database or Cursor method.
<p></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>partial</code> - Whether this DatabaseEntry is configured to read or write partial
records.
<p></dd><dt><span class="strong">See Also:</span></dt><dd><a href="../../../com/sleepycat/db/DatabaseEntry.html#setPartial(int,%20int,%20boolean)"><code>setPartial(int,int,boolean)</code></a></dd></dl>
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<pre>public void setPartial(int doff,
int dlen,
boolean partial)</pre>
<div class="block">Configures this DatabaseEntry to read or write partial records.
<p>
Do partial retrieval or storage of an item. If the calling
application is doing a retrieval, length bytes specified by
<tt>dlen</tt>, starting at the offset set by <tt>doff</tt> bytes from
the beginning of the retrieved data record are returned as if they
comprised the entire record. If any or all of the specified bytes do
not exist in the record, the get is successful, and any existing bytes
are returned.
<p>
For example, if the data portion of a retrieved record was 100 bytes,
and a partial retrieval was done using a DatabaseEntry having a partial
length of 20 and a partial offset of 85, the retrieval would succeed and
the retrieved data would be the last 15 bytes of the record.
<p>
If the calling application is storing an item, length bytes specified
by <tt>dlen</tt>, starting at the offset set by <tt>doff</tt>
bytes from the beginning of the specified key's data item are replaced
by the data specified by the DatabaseEntry. If the partial length is
smaller than the data, the record will grow; if the partial length is
larger than the data, the record will shrink. If the specified bytes do
not exist, the record will be extended using nul bytes as necessary, and
the store will succeed.
<p>
It is an error to specify a partial key when performing a put
operation of any kind.
<p>
It is an error to attempt a partial store using the <a href="../../../com/sleepycat/db/Database.html#put(com.sleepycat.db.Transaction,%20com.sleepycat.db.DatabaseEntry,%20com.sleepycat.db.DatabaseEntry)"><code>Database.put</code></a> method in a database that supports duplicate records. Partial
stores in databases supporting duplicate records must be done using a
cursor method.
<p>
Note that the Partial properties are set only by the caller. They
will never be set by a Database or Cursor method.
<p></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>doff</code> - The offset of the partial record being read or written by the
application, in bytes.
<p></dd><dd><code>dlen</code> - The byte length of the partial record being read or written by the
application, in bytes.
<p></dd><dd><code>partial</code> - Whether this DatabaseEntry is configured to read or write partial
records.</dd></dl>
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<h4>getReadOnly</h4>
<pre>public boolean getReadOnly()</pre>
<div class="block">Return whether this DatabaseEntry is configured as read only.
<p></div>
<dl><dt><span class="strong">Returns:</span></dt><dd>Whether this DatabaseEntry is configured as read only.
<p></dd><dt><span class="strong">See Also:</span></dt><dd><a href="../../../com/sleepycat/db/DatabaseEntry.html#setReadOnly(boolean)"><code>setReadOnly(boolean)</code></a></dd></dl>
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<h4>setReadOnly</h4>
<pre>public void setReadOnly(boolean readonly)</pre>
<div class="block">Configure this DatabaseEntry as read only.
<p></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>readonly</code> - Whether this DatabaseEntry is configured as read only.</dd></dl>
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<pre>public int getRecordNumber()</pre>
<div class="block">Return the record number encoded in this entry's buffer.
<p>
This method may be called at any time during the life of the application.
<p></div>
<dl><dt><span class="strong">Returns:</span></dt><dd>The record number encoded in this entry's buffer.</dd></dl>
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<pre>public void setRecordNumber(int recno)</pre>
<div class="block">Initialize the entry from a logical record number. Record numbers
are integer keys starting at 1. When this method is called the data,
size and offset fields are implicitly set to hold a byte array
representation of the integer key.</div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>recno</code> - the record number to be encoded</dd></dl>
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<pre>public boolean getReuseBuffer()</pre>
<div class="block">Return true if the whether the entry is configured to reuse the buffer.
<p>
This method may be called at any time during the life of the application.
<p></div>
<dl><dt><span class="strong">Returns:</span></dt><dd>True if the whether the entry is configured to reuse the buffer.</dd></dl>
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<pre>public void setReuseBuffer(boolean reuse)</pre>
<div class="block">Configures the entry to try to reuse the buffer before allocating a new
one.
<p></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>reuse</code> - whether to reuse the buffer</dd></dl>
</li>
</ul>
<a name="getSize()">
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<h4>getSize</h4>
<pre>public int getSize()</pre>
<div class="block">Return the byte size of the data array.
<p>
For a DatabaseEntry that is used as an output parameter, the size
will always be the length of the data array.
<p></div>
<dl><dt><span class="strong">Returns:</span></dt><dd>Number of bytes in the byte array to be included.</dd></dl>
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<h4>setSize</h4>
<pre>public void setSize(int size)</pre>
<div class="block">Set the byte size of the data array.
<p></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>size</code> - Number of bytes in the byte array to be included.</dd></dl>
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<pre>public boolean getUserBuffer()</pre>
<div class="block">Return true if the whether the buffer in this entry is owned by the
application.
<p>
This method may be called at any time during the life of the application.
<p></div>
<dl><dt><span class="strong">Returns:</span></dt><dd>True if the whether the buffer in this entry is owned by the
application.</dd></dl>
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<h4>getUserBufferLength</h4>
<pre>public int getUserBufferLength()</pre>
<div class="block">Return the length of the application's buffer.
<p>
This method may be called at any time during the life of the application.
<p></div>
<dl><dt><span class="strong">Returns:</span></dt><dd>The length of the application's buffer.</dd></dl>
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<pre>public void setUserBuffer(int length,
boolean usermem)</pre>
<div class="block">Configures the entry with an application-owned buffer.
<p>
The <code>data</code> field of the entry must refer to a buffer that is
at least <code>length</code> bytes in length.
<p>
If the length of the requested item is less than or equal to that number
of bytes, the item is copied into the memory to which the
<code>data</code> field refers. Otherwise, the <code>size</code> field
is set to the length needed for the requested item, and a
<a href="../../../com/sleepycat/db/MemoryException.html" title="class in com.sleepycat.db"><code>MemoryException</code></a> is thrown.
<p>
Applications can determine the length of a record by setting
<code>length</code> to 0 and calling <a href="../../../com/sleepycat/db/DatabaseEntry.html#getSize()"><code>DatabaseEntry.getSize</code></a>
on the return value.
<p></div>
<dl><dt><span class="strong">Parameters:</span></dt><dd><code>length</code> - the length of the buffer
<p></dd><dd><code>usermem</code> - whether the buffer is owned by the application</dd></dl>
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<pre>public boolean equals(java.lang.Object o)</pre>
<div class="block">Compares the data of two entries for byte-by-byte equality.
<p>In either entry, if the offset is non-zero or the size is not equal
to the data array length, then only the data bounded by these values is
compared. The data array length and offset need not be the same in both
entries for them to be considered equal.</p>
<p>If the data array is null in one entry, then to be considered equal
both entries must have a null data array.</p>
<p>If the partial property is set in either entry, then to be considered
equal both entries must have the same partial properties: partial,
partialOffset and partialLength.</div>
<dl>
<dt><strong>Overrides:</strong></dt>
<dd><code>equals</code> in class <code>java.lang.Object</code></dd>
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<pre>public int hashCode()</pre>
<div class="block">Returns a hash code based on the data value.</div>
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<dt><strong>Overrides:</strong></dt>
<dd><code>hashCode</code> in class <code>java.lang.Object</code></dd>
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