org.eclipse.collections.impl.lazy.AbstractLazyIterable Maven / Gradle / Ivy
/*
* Copyright (c) 2016 Goldman Sachs.
* 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.impl.lazy;
import java.util.Collection;
import java.util.Comparator;
import java.util.Iterator;
import java.util.Optional;
import org.eclipse.collections.api.LazyBooleanIterable;
import org.eclipse.collections.api.LazyByteIterable;
import org.eclipse.collections.api.LazyCharIterable;
import org.eclipse.collections.api.LazyDoubleIterable;
import org.eclipse.collections.api.LazyFloatIterable;
import org.eclipse.collections.api.LazyIntIterable;
import org.eclipse.collections.api.LazyIterable;
import org.eclipse.collections.api.LazyLongIterable;
import org.eclipse.collections.api.LazyShortIterable;
import org.eclipse.collections.api.RichIterable;
import org.eclipse.collections.api.block.function.Function;
import org.eclipse.collections.api.block.function.Function0;
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.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.Procedure2;
import org.eclipse.collections.api.map.MapIterable;
import org.eclipse.collections.api.map.MutableMap;
import org.eclipse.collections.api.map.primitive.MutableObjectDoubleMap;
import org.eclipse.collections.api.map.primitive.MutableObjectLongMap;
import org.eclipse.collections.api.map.primitive.ObjectDoubleMap;
import org.eclipse.collections.api.map.primitive.ObjectLongMap;
import org.eclipse.collections.api.multimap.Multimap;
import org.eclipse.collections.api.partition.list.PartitionMutableList;
import org.eclipse.collections.api.stack.MutableStack;
import org.eclipse.collections.api.tuple.Pair;
import org.eclipse.collections.impl.AbstractRichIterable;
import org.eclipse.collections.impl.block.factory.Functions;
import org.eclipse.collections.impl.block.factory.Predicates;
import org.eclipse.collections.impl.block.factory.PrimitiveFunctions;
import org.eclipse.collections.impl.block.factory.Procedures2;
import org.eclipse.collections.impl.block.procedure.MaxByProcedure;
import org.eclipse.collections.impl.block.procedure.MaxComparatorProcedure;
import org.eclipse.collections.impl.block.procedure.MaxProcedure;
import org.eclipse.collections.impl.block.procedure.MinByProcedure;
import org.eclipse.collections.impl.block.procedure.MinComparatorProcedure;
import org.eclipse.collections.impl.block.procedure.MinProcedure;
import org.eclipse.collections.impl.block.procedure.MutatingAggregationProcedure;
import org.eclipse.collections.impl.block.procedure.PartitionProcedure;
import org.eclipse.collections.impl.lazy.primitive.CollectBooleanIterable;
import org.eclipse.collections.impl.lazy.primitive.CollectByteIterable;
import org.eclipse.collections.impl.lazy.primitive.CollectCharIterable;
import org.eclipse.collections.impl.lazy.primitive.CollectDoubleIterable;
import org.eclipse.collections.impl.lazy.primitive.CollectFloatIterable;
import org.eclipse.collections.impl.lazy.primitive.CollectIntIterable;
import org.eclipse.collections.impl.lazy.primitive.CollectLongIterable;
import org.eclipse.collections.impl.lazy.primitive.CollectShortIterable;
import org.eclipse.collections.impl.map.mutable.UnifiedMap;
import org.eclipse.collections.impl.map.mutable.primitive.ObjectDoubleHashMap;
import org.eclipse.collections.impl.map.mutable.primitive.ObjectLongHashMap;
import org.eclipse.collections.impl.multimap.list.FastListMultimap;
import org.eclipse.collections.impl.partition.list.PartitionFastList;
import org.eclipse.collections.impl.stack.mutable.ArrayStack;
import org.eclipse.collections.impl.utility.LazyIterate;
/**
* AbstractLazyIterable provides a base from which deferred iterables such as SelectIterable,
* RejectIterable and CollectIterable can be derived.
*/
public abstract class AbstractLazyIterable
extends AbstractRichIterable
implements LazyIterable
{
@Override
public LazyIterable asLazy()
{
return this;
}
@Override
public > R into(R target)
{
this.forEachWith(Procedures2.addToCollection(), target);
return target;
}
@Override
public E[] toArray(E[] array)
{
return this.toList().toArray(array);
}
@Override
public int size()
{
return this.count(Predicates.alwaysTrue());
}
@Override
public boolean isEmpty()
{
return !this.anySatisfy(Predicates.alwaysTrue());
}
@Override
public T getFirst()
{
return this.detect(Predicates.alwaysTrue());
}
@Override
public T getLast()
{
T[] result = (T[]) new Object[1];
this.each(each -> result[0] = each);
return result[0];
}
@Override
public T getOnly()
{
Iterator iterator = this.iterator();
if (!iterator.hasNext())
{
throw new IllegalStateException("Size must be 1 but was 0");
}
T result = iterator.next();
if (iterator.hasNext())
{
throw new IllegalStateException("Size must be 1 but was greater than 1");
}
return result;
}
@Override
public LazyIterable select(Predicate predicate)
{
return LazyIterate.select(this, predicate);
}
@Override
public LazyIterable selectWith(Predicate2 predicate, P parameter)
{
return LazyIterate.select(this, Predicates.bind(predicate, parameter));
}
@Override
public LazyIterable reject(Predicate predicate)
{
return LazyIterate.reject(this, predicate);
}
@Override
public LazyIterable rejectWith(Predicate2 predicate, P parameter)
{
return LazyIterate.reject(this, Predicates.bind(predicate, parameter));
}
@Override
public PartitionMutableList partition(Predicate predicate)
{
PartitionMutableList partitionMutableList = new PartitionFastList<>();
this.forEach(new PartitionProcedure<>(predicate, partitionMutableList));
return partitionMutableList;
}
@Override
public PartitionMutableList partitionWith(Predicate2 predicate, P parameter)
{
return this.partition(Predicates.bind(predicate, parameter));
}
@Override
public LazyIterable selectInstancesOf(Class clazz)
{
return LazyIterate.selectInstancesOf(this, clazz);
}
@Override
public LazyIterable collect(Function function)
{
return LazyIterate.collect(this, function);
}
@Override
public LazyBooleanIterable collectBoolean(BooleanFunction booleanFunction)
{
return new CollectBooleanIterable<>(this, booleanFunction);
}
@Override
public LazyByteIterable collectByte(ByteFunction byteFunction)
{
return new CollectByteIterable<>(this, byteFunction);
}
@Override
public LazyCharIterable collectChar(CharFunction charFunction)
{
return new CollectCharIterable<>(this, charFunction);
}
@Override
public LazyDoubleIterable collectDouble(DoubleFunction doubleFunction)
{
return new CollectDoubleIterable<>(this, doubleFunction);
}
@Override
public LazyFloatIterable collectFloat(FloatFunction floatFunction)
{
return new CollectFloatIterable<>(this, floatFunction);
}
@Override
public LazyIntIterable collectInt(IntFunction intFunction)
{
return new CollectIntIterable<>(this, intFunction);
}
@Override
public LazyLongIterable collectLong(LongFunction longFunction)
{
return new CollectLongIterable<>(this, longFunction);
}
@Override
public LazyShortIterable collectShort(ShortFunction shortFunction)
{
return new CollectShortIterable<>(this, shortFunction);
}
@Override
public LazyIterable collectWith(Function2 function, P parameter)
{
return LazyIterate.collect(this, Functions.bind(function, parameter));
}
@Override
public LazyIterable flatCollect(Function> function)
{
return LazyIterate.flatCollect(this, function);
}
@Override
public LazyIterable concatenate(Iterable iterable)
{
return LazyIterate.concatenate(this, iterable);
}
@Override
public LazyIterable collectIf(Predicate predicate, Function function)
{
return LazyIterate.collectIf(this, predicate, function);
}
@Override
public LazyIterable take(int count)
{
return LazyIterate.take(this, count);
}
@Override
public LazyIterable drop(int count)
{
return LazyIterate.drop(this, count);
}
@Override
public LazyIterable takeWhile(Predicate predicate)
{
return LazyIterate.takeWhile(this, predicate);
}
@Override
public LazyIterable dropWhile(Predicate predicate)
{
return LazyIterate.dropWhile(this, predicate);
}
@Override
public LazyIterable distinct()
{
return LazyIterate.distinct(this);
}
public MutableStack toStack()
{
return ArrayStack.newStack(this);
}
@Override
public Multimap groupBy(Function function)
{
return this.groupBy(function, FastListMultimap.newMultimap());
}
@Override
public Multimap groupByEach(Function> function)
{
return this.groupByEach(function, FastListMultimap.newMultimap());
}
@Override
public MapIterable groupByUniqueKey(Function function)
{
return this.groupByUniqueKey(function, UnifiedMap.newMap(this.size()));
}
@Override
public LazyIterable> zip(Iterable that)
{
return LazyIterate.zip(this, that);
}
@Override
public LazyIterable> zipWithIndex()
{
return LazyIterate.zipWithIndex(this);
}
@Override
public LazyIterable> chunk(int size)
{
return LazyIterate.chunk(this, size);
}
@Override
public LazyIterable tap(Procedure procedure)
{
return LazyIterate.tap(this, procedure);
}
@Override
public MapIterable aggregateInPlaceBy(
Function groupBy,
Function0 zeroValueFactory,
Procedure2 mutatingAggregator)
{
MutableMap map = UnifiedMap.newMap();
this.forEach(new MutatingAggregationProcedure<>(map, groupBy, zeroValueFactory, mutatingAggregator));
return map;
}
@Override
public ObjectLongMap sumByInt(Function groupBy, IntFunction function)
{
MutableObjectLongMap result = ObjectLongHashMap.newMap();
return this.injectInto(result, PrimitiveFunctions.sumByIntFunction(groupBy, function));
}
@Override
public ObjectDoubleMap sumByFloat(Function groupBy, FloatFunction function)
{
MutableObjectDoubleMap result = ObjectDoubleHashMap.newMap();
return this.injectInto(result, PrimitiveFunctions.sumByFloatFunction(groupBy, function));
}
@Override
public ObjectLongMap sumByLong(Function groupBy, LongFunction function)
{
MutableObjectLongMap result = ObjectLongHashMap.newMap();
return this.injectInto(result, PrimitiveFunctions.sumByLongFunction(groupBy, function));
}
@Override
public ObjectDoubleMap sumByDouble(Function groupBy, DoubleFunction function)
{
MutableObjectDoubleMap result = ObjectDoubleHashMap.newMap();
return this.injectInto(result, PrimitiveFunctions.sumByDoubleFunction(groupBy, function));
}
@Override
public Optional minOptional(Comparator comparator)
{
MinComparatorProcedure minComparatorProcedure = new MinComparatorProcedure<>(comparator);
this.forEach(minComparatorProcedure);
return minComparatorProcedure.getResultOptional();
}
@Override
public Optional maxOptional(Comparator comparator)
{
MaxComparatorProcedure maxComparatorProcedure = new MaxComparatorProcedure<>(comparator);
this.forEach(maxComparatorProcedure);
return maxComparatorProcedure.getResultOptional();
}
@Override
public Optional minOptional()
{
MinProcedure minProcedure = new MinProcedure<>();
this.forEach(minProcedure);
return minProcedure.getResultOptional();
}
@Override
public Optional maxOptional()
{
MaxProcedure maxProcedure = new MaxProcedure<>();
this.forEach(maxProcedure);
return maxProcedure.getResultOptional();
}
@Override
public > Optional minByOptional(Function function)
{
MinByProcedure minByProcedure = new MinByProcedure<>(function);
this.forEach(minByProcedure);
return minByProcedure.getResultOptional();
}
@Override
public > Optional maxByOptional(Function function)
{
MaxByProcedure maxByProcedure = new MaxByProcedure<>(function);
this.forEach(maxByProcedure);
return maxByProcedure.getResultOptional();
}
}