org.eclipse.collections.api.ordered.ReversibleIterable Maven / Gradle / Ivy
/*
* Copyright (c) 2018 Goldman Sachs and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* and Eclipse Distribution License v. 1.0 which accompany this distribution.
* The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
* and the Eclipse Distribution License is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*/
package org.eclipse.collections.api.ordered;
import org.eclipse.collections.api.LazyIterable;
import org.eclipse.collections.api.block.function.Function;
import org.eclipse.collections.api.block.function.Function2;
import org.eclipse.collections.api.block.function.primitive.BooleanFunction;
import org.eclipse.collections.api.block.function.primitive.ByteFunction;
import org.eclipse.collections.api.block.function.primitive.CharFunction;
import org.eclipse.collections.api.block.function.primitive.DoubleFunction;
import org.eclipse.collections.api.block.function.primitive.FloatFunction;
import org.eclipse.collections.api.block.function.primitive.IntFunction;
import org.eclipse.collections.api.block.function.primitive.LongFunction;
import org.eclipse.collections.api.block.function.primitive.ObjectIntToObjectFunction;
import org.eclipse.collections.api.block.function.primitive.ShortFunction;
import org.eclipse.collections.api.block.predicate.Predicate;
import org.eclipse.collections.api.block.predicate.Predicate2;
import org.eclipse.collections.api.block.procedure.Procedure;
import org.eclipse.collections.api.block.procedure.primitive.ObjectIntProcedure;
import org.eclipse.collections.api.multimap.ordered.ReversibleIterableMultimap;
import org.eclipse.collections.api.ordered.primitive.ReversibleBooleanIterable;
import org.eclipse.collections.api.ordered.primitive.ReversibleByteIterable;
import org.eclipse.collections.api.ordered.primitive.ReversibleCharIterable;
import org.eclipse.collections.api.ordered.primitive.ReversibleDoubleIterable;
import org.eclipse.collections.api.ordered.primitive.ReversibleFloatIterable;
import org.eclipse.collections.api.ordered.primitive.ReversibleIntIterable;
import org.eclipse.collections.api.ordered.primitive.ReversibleLongIterable;
import org.eclipse.collections.api.ordered.primitive.ReversibleShortIterable;
import org.eclipse.collections.api.partition.ordered.PartitionReversibleIterable;
import org.eclipse.collections.api.tuple.Pair;
/**
* A ReversibleIterable is an ordered iterable that you can iterate over forwards or backwards. Besides being ordered,
* it has methods that support efficient iteration from the end, including {@link #asReversed()} and
* {@link #reverseForEach(Procedure)}.
*
* @since 5.0
*/
public interface ReversibleIterable extends OrderedIterable
{
/**
* Evaluates the procedure for each element of the list iterating in reverse order.
*
* e.g.
* people.reverseForEach(person -> LOGGER.info(person.getName()));
*
*/
default void reverseForEach(Procedure procedure)
{
if (this.notEmpty())
{
this.forEach(this.size() - 1, 0, procedure);
}
}
/**
* Evaluates the procedure for each element and it's index in reverse order.
* e.g.
* people.reverseForEachWithIndex((person, index) ->
* LOGGER.info("Index: " + index + " person: " + person.getName()));
*
*
* @since 9.0.0
*/
default void reverseForEachWithIndex(ObjectIntProcedure procedure)
{
if (this.notEmpty())
{
this.forEachWithIndex(this.size() - 1, 0, procedure);
}
}
/**
* Returns a reversed view of this ReversibleIterable.
*/
default LazyIterable asReversed()
{
throw new UnsupportedOperationException(this.getClass().getSimpleName() + ".asReversed() not implemented yet");
}
/**
* Returns a new ReversibleIterable in reverse order.
*
* @since 6.0.0
*/
ReversibleIterable toReversed();
/**
* Returns the index of the last element of the {@code ReversibleIterable} for which the {@code predicate} evaluates to true.
* Returns -1 if no element evaluates true for the {@code predicate}.
*
* @since 6.0
*/
int detectLastIndex(Predicate predicate);
/**
* Returns the first {@code count} elements of the iterable
* or all the elements in the iterable if {@code count} is greater than the length of
* the iterable.
*
* @param count the number of items to take.
* @throws IllegalArgumentException if {@code count} is less than zero
* @since 6.0
*/
ReversibleIterable take(int count);
/**
* Returns the initial elements that satisfy the Predicate. Short circuits at the first element which does not
* satisfy the Predicate.
*/
@Override
ReversibleIterable takeWhile(Predicate predicate);
/**
* Returns an iterable after skipping the first {@code count} elements
* or an empty iterable if the {@code count} is greater than the length of the iterable.
*
* @param count the number of items to drop.
* @throws IllegalArgumentException if {@code count} is less than zero
* @since 6.0
*/
ReversibleIterable drop(int count);
/**
* Returns the final elements that do not satisfy the Predicate. Short circuits at the first element which does
* satisfy the Predicate.
*/
@Override
ReversibleIterable dropWhile(Predicate predicate);
@Override
PartitionReversibleIterable partitionWhile(Predicate predicate);
@Override
ReversibleIterable distinct();
@Override
ReversibleIterable tap(Procedure procedure);
@Override
ReversibleIterable select(Predicate predicate);
@Override
ReversibleIterable selectWith(Predicate2 predicate, P parameter);
@Override
ReversibleIterable reject(Predicate predicate);
@Override
ReversibleIterable rejectWith(Predicate2 predicate, P parameter);
@Override
PartitionReversibleIterable partition(Predicate predicate);
@Override
PartitionReversibleIterable partitionWith(Predicate2 predicate, P parameter);
@Override
ReversibleIterable selectInstancesOf(Class clazz);
@Override
ReversibleIterable collect(Function function);
/**
* @since 9.1.
*/
@Override
default ReversibleIterable collectWithIndex(ObjectIntToObjectFunction function)
{
int[] index = {0};
return this.collect(each -> function.valueOf(each, index[0]++));
}
@Override
ReversibleIterable collectWith(Function2 function, P parameter);
@Override
ReversibleIterable collectIf(Predicate predicate, Function function);
@Override
ReversibleIterable flatCollect(Function> function);
/**
* @since 9.2
*/
@Override
default ReversibleIterable flatCollectWith(Function2> function, P parameter)
{
return this.flatCollect(each -> function.apply(each, parameter));
}
@Override
ReversibleBooleanIterable collectBoolean(BooleanFunction booleanFunction);
@Override
ReversibleByteIterable collectByte(ByteFunction byteFunction);
@Override
ReversibleCharIterable collectChar(CharFunction charFunction);
@Override
ReversibleDoubleIterable collectDouble(DoubleFunction doubleFunction);
@Override
ReversibleFloatIterable collectFloat(FloatFunction floatFunction);
@Override
ReversibleIntIterable collectInt(IntFunction intFunction);
@Override
ReversibleLongIterable collectLong(LongFunction longFunction);
@Override
ReversibleShortIterable collectShort(ShortFunction shortFunction);
@Override
ReversibleIterableMultimap groupBy(Function function);
@Override
ReversibleIterableMultimap groupByEach(Function> function);
@Override
ReversibleIterable> zip(Iterable that);
@Override
ReversibleIterable> zipWithIndex();
}