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UniformGenerator.java
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Created
Sun, Aug 18, 12:16
Size
3 KB
Mime Type
text/x-java
Expires
Tue, Aug 20, 12:16 (2 d)
Engine
blob
Format
Raw Data
Handle
19986011
Attached To
R7507 YCSB
UniformGenerator.java
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/**
* Copyright (c) 2010 Yahoo! Inc. All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License"); you
* may not use this file except in compliance with the License. You
* may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
* implied. See the License for the specific language governing
* permissions and limitations under the License. See accompanying
* LICENSE file.
*/
package
com.yahoo.ycsb.generator
;
import
java.util.ArrayList
;
import
java.util.Collection
;
import
java.util.List
;
/**
* An expression that generates a random value in the specified range
*/
public
class
UniformGenerator
extends
Generator
<
String
>
{
private
final
List
<
String
>
_values
;
private
String
_laststring
;
private
final
UniformIntegerGenerator
_gen
;
/**
* Creates a generator that will return strings from the specified set uniformly randomly
*/
public
UniformGenerator
(
Collection
<
String
>
values
)
{
_values
=
new
ArrayList
<>(
values
);
_laststring
=
null
;
_gen
=
new
UniformIntegerGenerator
(
0
,
values
.
size
()-
1
);
}
/**
* Generate the next string in the distribution.
*/
@Override
public
String
nextValue
()
{
_laststring
=
_values
.
get
(
_gen
.
nextValue
());
return
_laststring
;
}
/**
* Return the previous string generated by the distribution; e.g., returned from the last nextString() call.
* Calling lastString() should not advance the distribution or have any side effects. If nextString() has not yet
* been called, lastString() should return something reasonable.
*/
@Override
public
String
lastValue
()
{
if
(
_laststring
==
null
)
{
nextValue
();
}
return
_laststring
;
}
}
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