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前往新版Gitcode,体验更适合开发者的 AI 搜索 >>
提交
2cf88ac6
编写于
6月 04, 2014
作者:
J
Juergen Hoeller
浏览文件
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Showing
2 changed file
with
76 addition
and
43 deletion
+76
-43
spring-core/src/main/java/org/springframework/util/CompositeIterator.java
...main/java/org/springframework/util/CompositeIterator.java
+24
-22
spring-core/src/test/java/org/springframework/util/CompositeIteratorTests.java
...java/org/springframework/util/CompositeIteratorTests.java
+52
-21
未找到文件。
spring-core/src/main/java/org/springframework/util/CompositeIterator.java
浏览文件 @
2cf88ac6
/*
* Copyright 2002-201
2
the original author or authors.
* Copyright 2002-201
4
the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
...
...
@@ -13,46 +13,48 @@
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package
org.springframework.util
;
import
java.util.Iterator
;
import
java.util.LinkedList
;
import
java.util.List
;
import
java.util.LinkedHashSet
;
import
java.util.NoSuchElementException
;
import
java.util.Set
;
/**
* Iterator that combines multiple other iterators.
* This implementation maintains a list of iterators which are invoked in sequence until all iterators are exhausted.
* Composite iterator that combines multiple other iterators,
* as registered via {@link #add(Iterator)}.
*
* <p>This implementation maintains a linked set of iterators
* which are invoked in sequence until all iterators are exhausted.
*
* @author Erwin Vervaet
* @author Juergen Hoeller
* @since 3.0
*/
public
class
CompositeIterator
<
E
>
implements
Iterator
<
E
>
{
private
List
<
Iterator
<
E
>>
iterators
=
new
LinkedLis
t
<
Iterator
<
E
>>();
private
final
Set
<
Iterator
<
E
>>
iterators
=
new
LinkedHashSe
t
<
Iterator
<
E
>>();
private
boolean
inUse
=
false
;
/**
* Create a new composite iterator. Add iterators using the {@link #add(Iterator)} method.
*/
public
CompositeIterator
()
{
}
/**
* Add given iterator to this composite.
*/
public
void
add
(
Iterator
<
E
>
iterator
)
{
Assert
.
state
(!
inUse
,
"You can no longer add iterator
to a composite iterator that's already in use"
);
if
(
iterators
.
contains
(
iterator
))
{
Assert
.
state
(!
this
.
inUse
,
"You can no longer add iterators
to a composite iterator that's already in use"
);
if
(
this
.
iterators
.
contains
(
iterator
))
{
throw
new
IllegalArgumentException
(
"You cannot add the same iterator twice"
);
}
iterators
.
add
(
iterator
);
this
.
iterators
.
add
(
iterator
);
}
@Override
public
boolean
hasNext
()
{
inUse
=
true
;
for
(
Iterator
<
Iterator
<
E
>>
it
=
iterators
.
iterator
();
it
.
hasNext
();
)
{
if
(
it
.
next
()
.
hasNext
())
{
this
.
inUse
=
true
;
for
(
Iterator
<
E
>
iterator
:
this
.
iterators
)
{
if
(
it
erator
.
hasNext
())
{
return
true
;
}
}
...
...
@@ -61,18 +63,18 @@ public class CompositeIterator<E> implements Iterator<E> {
@Override
public
E
next
()
{
inUse
=
true
;
for
(
Iterator
<
Iterator
<
E
>>
it
=
iterators
.
iterator
();
it
.
hasNext
();)
{
Iterator
<
E
>
iterator
=
it
.
next
();
this
.
inUse
=
true
;
for
(
Iterator
<
E
>
iterator
:
this
.
iterators
)
{
if
(
iterator
.
hasNext
())
{
return
iterator
.
next
();
}
}
throw
new
NoSuchElementException
(
"
Exhausted all iterators
"
);
throw
new
NoSuchElementException
(
"
All iterators exhausted
"
);
}
@Override
public
void
remove
()
{
throw
new
UnsupportedOperationException
(
"
Remove is not supported
"
);
throw
new
UnsupportedOperationException
(
"
CompositeIterator does not support remove()
"
);
}
}
spring-core/src/test/java/org/springframework/util/CompositeIteratorTests.java
浏览文件 @
2cf88ac6
/*
* Copyright 2002-2014 the original author or authors.
*
* 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.
*/
package
org.springframework.util
;
import
java.util.Arrays
;
...
...
@@ -5,29 +21,36 @@ import java.util.Iterator;
import
java.util.List
;
import
java.util.NoSuchElementException
;
import
junit.framework.TestCase
;
import
org.junit.Test
;
import
static
org
.
junit
.
Assert
.*;
/**
* Test case for {@link CompositeIterator}.
*
* @author Erwin Vervaet
* @author Juergen Hoeller
*/
public
class
CompositeIteratorTests
extends
TestCase
{
public
class
CompositeIteratorTests
{
@Test
public
void
testNoIterators
()
{
CompositeIterator
it
=
new
CompositeIterator
();
CompositeIterator
<
String
>
it
=
new
CompositeIterator
<
String
>
();
assertFalse
(
it
.
hasNext
());
try
{
it
.
next
();
fail
();
}
catch
(
NoSuchElementException
e
)
{
}
catch
(
NoSuchElementException
ex
)
{
// expected
}
}
@Test
public
void
testSingleIterator
()
{
CompositeIterator
it
=
new
CompositeIterator
();
it
.
add
(
Arrays
.
asList
(
new
String
[]
{
"0"
,
"1"
}
).
iterator
());
CompositeIterator
<
String
>
it
=
new
CompositeIterator
<
String
>
();
it
.
add
(
Arrays
.
asList
(
"0"
,
"1"
).
iterator
());
for
(
int
i
=
0
;
i
<
2
;
i
++)
{
assertTrue
(
it
.
hasNext
());
assertEquals
(
String
.
valueOf
(
i
),
it
.
next
());
...
...
@@ -36,16 +59,18 @@ public class CompositeIteratorTests extends TestCase {
try
{
it
.
next
();
fail
();
}
catch
(
NoSuchElementException
e
)
{
}
catch
(
NoSuchElementException
ex
)
{
// expected
}
}
@Test
public
void
testMultipleIterators
()
{
CompositeIterator
it
=
new
CompositeIterator
();
it
.
add
(
Arrays
.
asList
(
new
String
[]
{
"0"
,
"1"
}
).
iterator
());
it
.
add
(
Arrays
.
asList
(
new
String
[]
{
"2"
}
).
iterator
());
it
.
add
(
Arrays
.
asList
(
new
String
[]
{
"3"
,
"4"
}
).
iterator
());
CompositeIterator
<
String
>
it
=
new
CompositeIterator
<
String
>
();
it
.
add
(
Arrays
.
asList
(
"0"
,
"1"
).
iterator
());
it
.
add
(
Arrays
.
asList
(
"2"
).
iterator
());
it
.
add
(
Arrays
.
asList
(
"3"
,
"4"
).
iterator
());
for
(
int
i
=
0
;
i
<
5
;
i
++)
{
assertTrue
(
it
.
hasNext
());
assertEquals
(
String
.
valueOf
(
i
),
it
.
next
());
...
...
@@ -54,43 +79,49 @@ public class CompositeIteratorTests extends TestCase {
try
{
it
.
next
();
fail
();
}
catch
(
NoSuchElementException
e
)
{
}
catch
(
NoSuchElementException
ex
)
{
// expected
}
}
@Test
public
void
testInUse
()
{
List
list
=
Arrays
.
asList
(
new
String
[]
{
"0"
,
"1"
}
);
CompositeIterator
it
=
new
CompositeIterator
();
List
<
String
>
list
=
Arrays
.
asList
(
"0"
,
"1"
);
CompositeIterator
<
String
>
it
=
new
CompositeIterator
<
String
>
();
it
.
add
(
list
.
iterator
());
it
.
hasNext
();
try
{
it
.
add
(
list
.
iterator
());
fail
();
}
catch
(
IllegalStateException
e
)
{
}
catch
(
IllegalStateException
ex
)
{
// expected
}
it
=
new
CompositeIterator
();
it
=
new
CompositeIterator
<
String
>
();
it
.
add
(
list
.
iterator
());
it
.
next
();
try
{
it
.
add
(
list
.
iterator
());
fail
();
}
catch
(
IllegalStateException
e
)
{
}
catch
(
IllegalStateException
ex
)
{
// expected
}
}
@Test
public
void
testDuplicateIterators
()
{
List
list
=
Arrays
.
asList
(
new
String
[]
{
"0"
,
"1"
}
);
Iterator
iterator
=
list
.
iterator
();
CompositeIterator
it
=
new
CompositeIterator
();
List
<
String
>
list
=
Arrays
.
asList
(
"0"
,
"1"
);
Iterator
<
String
>
iterator
=
list
.
iterator
();
CompositeIterator
<
String
>
it
=
new
CompositeIterator
<
String
>
();
it
.
add
(
iterator
);
it
.
add
(
list
.
iterator
());
try
{
it
.
add
(
iterator
);
fail
();
}
catch
(
IllegalArgumentException
e
)
{
}
catch
(
IllegalArgumentException
ex
)
{
// expected
}
}
...
...
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