/*
* Copyright 2015 Goldman Sachs.
*
* 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 com.gs.collections.impl.parallel;
import java.util.Collection;
import com.gs.collections.api.bag.Bag;
import com.gs.collections.api.block.procedure.Procedure;
import com.gs.collections.api.list.ListIterable;
import com.gs.collections.api.map.MapIterable;
import com.gs.collections.api.set.SetIterable;
import com.gs.collections.api.set.sorted.SortedSetIterable;
import com.gs.collections.impl.bag.mutable.HashBag;
import com.gs.collections.impl.list.mutable.CompositeFastList;
import com.gs.collections.impl.list.mutable.FastList;
import com.gs.collections.impl.set.mutable.UnifiedSet;
import com.gs.collections.impl.set.sorted.mutable.TreeSortedSet;
import com.gs.collections.impl.utility.internal.DefaultSpeciesNewStrategy;
public abstract class AbstractPredicateBasedCombiner<T, BT extends Procedure<T>>
extends AbstractProcedureCombiner<BT>
{
private static final long serialVersionUID = 1L;
protected final Collection<T> result;
protected AbstractPredicateBasedCombiner(
boolean useCombineOne,
Iterable<?> sourceCollection,
int initialCapacity,
Collection<T> targetCollection)
{
super(useCombineOne);
this.result = this.initializeResult(sourceCollection, targetCollection, initialCapacity);
}
protected final Collection<T> initializeResult(
Iterable<?> sourceCollection,
Collection<T> targetCollection,
int initialCapacity)
{
if (targetCollection != null)
{
return targetCollection;
}
if (sourceCollection instanceof ListIterable)
{
return new CompositeFastList<T>();
}
if (sourceCollection instanceof SortedSetIterable)
{
return TreeSortedSet.newSet(((SortedSetIterable<T>) sourceCollection).comparator());
}
if (sourceCollection instanceof SetIterable)
{
this.setCombineOne(true);
return UnifiedSet.newSet(initialCapacity);
}
if (sourceCollection instanceof Bag || sourceCollection instanceof MapIterable)
{
return HashBag.newBag();
}
return this.createResultForCollection(sourceCollection, initialCapacity);
}
private Collection<T> createResultForCollection(Iterable<?> sourceCollection, int initialCapacity)
{
if (sourceCollection instanceof Collection)
{
return DefaultSpeciesNewStrategy.INSTANCE.speciesNew((Collection<?>) sourceCollection, initialCapacity);
}
return FastList.newList(initialCapacity);
}
public Collection<T> getResult()
{
return this.result;
}
}