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54743866
编写于
1月 31, 2016
作者:
S
Stephan Ewen
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差异文件
[FLINK-3049] [api breaking] Move 'Either' type to 'flink-core / org.apache.flink.types'
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360f02b1
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1
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1 changed file
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185 addition
and
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-0
flink-core/src/main/java/org/apache/flink/types/Either.java
flink-core/src/main/java/org/apache/flink/types/Either.java
+185
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未找到文件。
flink-core/src/main/java/org/apache/flink/types/Either.java
0 → 100644
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54743866
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*/
package
org.apache.flink.types
;
/**
* This type represents a value of one two possible types, Left or Right (a
* disjoint union), inspired by Scala's Either type.
*
* @param <L>
* the type of Left
* @param <R>
* the type of Right
*/
public
abstract
class
Either
<
L
,
R
>
{
/**
* Create a Left value of Either
*/
public
static
<
L
,
R
>
Either
<
L
,
R
>
Left
(
L
value
)
{
return
new
Left
<
L
,
R
>(
value
);
}
/**
* Create a Right value of Either
*/
public
static
<
L
,
R
>
Either
<
L
,
R
>
Right
(
R
value
)
{
return
new
Right
<
L
,
R
>(
value
);
}
/**
* Retrieve the Left value of Either.
*
* @return the Left value
* @throws IllegalStateException
* if called on a Right
*/
public
abstract
L
left
()
throws
IllegalStateException
;
/**
* Retrieve the Right value of Either.
*
* @return the Right value
* @throws IllegalStateException
* if called on a Left
*/
public
abstract
R
right
()
throws
IllegalStateException
;
/**
*
* @return true if this is a Left value, false if this is a Right value
*/
public
final
boolean
isLeft
()
{
return
getClass
()
==
Left
.
class
;
}
/**
*
* @return true if this is a Right value, false if this is a Left value
*/
public
final
boolean
isRight
()
{
return
getClass
()
==
Right
.
class
;
}
/**
* A left value of {@link Either}
*
* @param <L>
* the type of Left
* @param <R>
* the type of Right
*/
public
static
class
Left
<
L
,
R
>
extends
Either
<
L
,
R
>
{
private
final
L
value
;
public
Left
(
L
value
)
{
this
.
value
=
java
.
util
.
Objects
.
requireNonNull
(
value
);
}
@Override
public
L
left
()
{
return
value
;
}
@Override
public
R
right
()
{
throw
new
IllegalStateException
(
"Cannot retrieve Right value on a Left"
);
}
@Override
public
boolean
equals
(
Object
object
)
{
if
(
object
instanceof
Left
<?,
?>)
{
final
Left
<?,
?>
other
=
(
Left
<?,
?>)
object
;
return
value
.
equals
(
other
.
value
);
}
return
false
;
}
@Override
public
int
hashCode
()
{
return
value
.
hashCode
();
}
@Override
public
String
toString
()
{
return
"Left("
+
value
.
toString
()
+
")"
;
}
/**
* Creates a left value of {@link Either}
*
*/
public
static
<
L
,
R
>
Left
<
L
,
R
>
of
(
L
left
)
{
return
new
Left
<
L
,
R
>(
left
);
}
}
/**
* A right value of {@link Either}
*
* @param <L>
* the type of Left
* @param <R>
* the type of Right
*/
public
static
class
Right
<
L
,
R
>
extends
Either
<
L
,
R
>
{
private
final
R
value
;
public
Right
(
R
value
)
{
this
.
value
=
java
.
util
.
Objects
.
requireNonNull
(
value
);
}
@Override
public
L
left
()
{
throw
new
IllegalStateException
(
"Cannot retrieve Left value on a Right"
);
}
@Override
public
R
right
()
{
return
value
;
}
@Override
public
boolean
equals
(
Object
object
)
{
if
(
object
instanceof
Right
<?,
?>)
{
final
Right
<?,
?>
other
=
(
Right
<?,
?>)
object
;
return
value
.
equals
(
other
.
value
);
}
return
false
;
}
@Override
public
int
hashCode
()
{
return
value
.
hashCode
();
}
@Override
public
String
toString
()
{
return
"Right("
+
value
.
toString
()
+
")"
;
}
/**
* Creates a right value of {@link Either}
*
*/
public
static
<
L
,
R
>
Right
<
L
,
R
>
of
(
R
right
)
{
return
new
Right
<
L
,
R
>(
right
);
}
}
}
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