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/** | ||
* The MIT License (MIT) | ||
* | ||
* Copyright (c) 2017-2018 Yegor Bugayenko | ||
* | ||
* Permission is hereby granted, free of charge, to any person obtaining a copy | ||
* of this software and associated documentation files (the "Software"), to deal | ||
* in the Software without restriction, including without limitation the rights | ||
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
* copies of the Software, and to permit persons to whom the Software is | ||
* furnished to do so, subject to the following conditions: | ||
* | ||
* The above copyright notice and this permission notice shall be included | ||
* in all copies or substantial portions of the Software. | ||
* | ||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE | ||
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | ||
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | ||
* SOFTWARE. | ||
*/ | ||
package org.cactoos.map; | ||
|
||
import java.util.List; | ||
import java.util.Map; | ||
import java.util.function.Function; | ||
import java.util.stream.Collectors; | ||
import java.util.stream.Stream; | ||
import java.util.stream.StreamSupport; | ||
|
||
/** | ||
* Iterable as {@link Map}. | ||
* | ||
* <p>This class groups objects from iterable by applying | ||
* functions for keys and values</p> | ||
* | ||
* <p>There is no thread-safety guarantee. | ||
* | ||
* @author Nikita Salomatin (nsalomatin@hotmail.com) | ||
* @version $Id$ | ||
* @param <K> Type of key | ||
* @param <V> Type of value | ||
* @param <T> Type of entry objects of functions | ||
* @since 0.30 | ||
*/ | ||
public final class Grouped<K, V, T> extends MapEnvelope<K, List<V>> { | ||
|
||
/** | ||
* Ctor. | ||
* | ||
* @param list Iterable which is used to retrieve data from | ||
* @param keys Function to get a key | ||
* @param values Function to get a value | ||
*/ | ||
public Grouped( | ||
final Iterable<T> list, | ||
final Function<T, K> keys, | ||
final Function<T, V> values | ||
) { | ||
super(() -> { | ||
final Stream<T> stream = StreamSupport.stream( | ||
list.spliterator(), false | ||
); | ||
return stream.collect( | ||
Collectors.groupingBy( | ||
keys, | ||
Collectors.mapping(values, Collectors.toList()) | ||
) | ||
); | ||
}); | ||
} | ||
} |
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/** | ||
* The MIT License (MIT) | ||
* | ||
* Copyright (c) 2017-2018 Yegor Bugayenko | ||
* | ||
* Permission is hereby granted, free of charge, to any person obtaining a copy | ||
* of this software and associated documentation files (the "Software"), to deal | ||
* in the Software without restriction, including without limitation the rights | ||
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
* copies of the Software, and to permit persons to whom the Software is | ||
* furnished to do so, subject to the following conditions: | ||
* | ||
* The above copyright notice and this permission notice shall be included | ||
* in all copies or substantial portions of the Software. | ||
* | ||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE | ||
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | ||
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | ||
* SOFTWARE. | ||
*/ | ||
package org.cactoos.scalar; | ||
|
||
import org.cactoos.Scalar; | ||
|
||
/** | ||
* Constant value. | ||
* | ||
* <p>This {@link Scalar} represents a constant value which never changes.</p> | ||
* | ||
* <p>Contrary to {@link StickyScalar} this constant is always | ||
* pre-computed.</p> | ||
* | ||
* <p>This class implements {@link Scalar}, which throws a checked | ||
* {@link Exception}. Despite that this class does NOT throw a checked | ||
* exception as it only returns a pre-computed value.</p> | ||
* | ||
* <p>Example: | ||
* <pre> | ||
* final Scalar<String> constant = new Constant≶>("Value"); | ||
* System.out.print("Constant is always the same: "); | ||
* System.out.println(constant.value() == constant.value()); | ||
* </pre> | ||
* </p> | ||
* | ||
* <p>This class is thread-safe.</p> | ||
* | ||
* @author Aliceice (elena.ihde-simon@posteo.de) | ||
* @version $Id$ | ||
* @param <T> Type of result | ||
* @see StickyScalar | ||
* @since 0.30 | ||
*/ | ||
public final class Constant<T> implements Scalar<T> { | ||
|
||
/** | ||
* Pre-computed value. | ||
*/ | ||
private final T val; | ||
|
||
/** | ||
* Ctor. | ||
* @param value The pre-computed constant. | ||
*/ | ||
public Constant(final T value) { | ||
this.val = value; | ||
} | ||
|
||
@Override | ||
public T value() { | ||
return this.val; | ||
} | ||
} |
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