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/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 2000, 2011 Oracle and/or its affiliates. All rights reserved.
*
*/
package com.sleepycat.bind.tuple;
import com.sleepycat.db.DatabaseEntry;
import com.sleepycat.util.PackedInteger;
/**
* A concrete <code>TupleBinding</code> for a sorted <code>Long</code>
* primitive wrapper or a sorted <code>long</code> primitive, that stores the
* value in the smallest number of bytes possible.
*
* <p>There are two ways to use this class:</p>
* <ol>
* <li>When using the {@link com.sleepycat.db} package directly, the static
* methods in this class can be used to convert between primitive values and
* {@link DatabaseEntry} objects.</li>
* <li>When using the {@link com.sleepycat.collections} package, an instance of
* this class can be used with any stored collection.</li>
* </ol>
*
* @see <a href="package-summary.html#integerFormats">Integer Formats</a>
*/
public class SortedPackedLongBinding extends TupleBinding<Long> {
// javadoc is inherited
public Long entryToObject(TupleInput input) {
return input.readSortedPackedLong();
}
// javadoc is inherited
public void objectToEntry(Long object, TupleOutput output) {
output.writeSortedPackedLong(object);
}
// javadoc is inherited
protected TupleOutput getTupleOutput(Long object) {
return sizedOutput();
}
/**
* Converts an entry buffer into a simple <code>Long</code> value.
*
* @param entry is the source entry buffer.
*
* @return the resulting value.
*/
public static Long entryToLong(DatabaseEntry entry) {
return entryToInput(entry).readSortedPackedLong();
}
/**
* Converts a simple <code>Long</code> value into an entry buffer, using
* SortedPackedLong format.
*
* @param val is the source value.
*
* @param entry is the destination entry buffer.
*/
public static void longToEntry(long val, DatabaseEntry entry) {
outputToEntry(sizedOutput().writeSortedPackedLong(val), entry);
}
/**
* Returns a tuple output object of the maximum size needed, to avoid
* wasting space when a single primitive is output.
*/
private static TupleOutput sizedOutput() {
return new TupleOutput(new byte[PackedInteger.MAX_LONG_LENGTH]);
}
}
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