package org.eclipse.collections.impl.lazy.parallel.list;
import java.util.Iterator;
import java.util.RandomAccess;
import java.util.concurrent.ExecutorService;
import org.eclipse.collections.api.LazyIterable;
import org.eclipse.collections.api.annotation.Beta;
import org.eclipse.collections.api.block.function.Function;
import org.eclipse.collections.api.block.predicate.Predicate;
import org.eclipse.collections.api.block.procedure.Procedure;
import org.eclipse.collections.api.list.ListIterable;
import org.eclipse.collections.api.map.MapIterable;
import org.eclipse.collections.api.multimap.list.ListMultimap;
import org.eclipse.collections.impl.lazy.AbstractLazyIterable;
import org.eclipse.collections.impl.lazy.parallel.AbstractParallelIterable;
@Beta
public final class ListIterableParallelIterable<T> extends AbstractParallelListIterable<T, RootListBatch<T>>
{
private final ListIterable<T> delegate;
private final ExecutorService executorService;
private final int batchSize;
public ListIterableParallelIterable(ListIterable<T> delegate, ExecutorService executorService, int batchSize)
{
if (executorService == null)
{
throw new NullPointerException();
}
if (batchSize < 1)
{
throw new IllegalArgumentException();
}
if (!(delegate instanceof RandomAccess))
{
throw new IllegalArgumentException();
}
this.delegate = delegate;
this.executorService = executorService;
this.batchSize = batchSize;
}
@Override
public ExecutorService getExecutorService()
{
return this.executorService;
}
@Override
public LazyIterable<RootListBatch<T>> split()
{
return new ListIterableParallelBatchLazyIterable();
}
@Override
public void forEach(Procedure<? super T> procedure)
{
AbstractParallelIterable.forEach(this, procedure);
}
@Override
public boolean anySatisfy(Predicate<? super T> predicate)
{
return AbstractParallelIterable.anySatisfy(this, predicate);
}
@Override
public boolean allSatisfy(Predicate<? super T> predicate)
{
return AbstractParallelIterable.allSatisfy(this, predicate);
}
@Override
public T detect(Predicate<? super T> predicate)
{
return AbstractParallelIterable.detect(this, predicate);
}
@Override
public Object[] toArray()
{
return this.delegate.toArray();
}
@Override
public <E> E[] toArray(E[] array)
{
return this.delegate.toArray(array);
}
@Override
public <V> ListMultimap<V, T> groupBy(Function<? super T, ? extends V> function)
{
return this.delegate.groupBy(function);
}
@Override
public <V> ListMultimap<V, T> groupByEach(Function<? super T, ? extends Iterable<V>> function)
{
return this.delegate.groupByEach(function);
}
@Override
public <V> MapIterable<V, T> groupByUniqueKey(Function<? super T, ? extends V> function)
{
return this.delegate.groupByUniqueKey(function);
}
@Override
public int getBatchSize()
{
return this.batchSize;
}
private class ListIterableParallelBatchIterator implements Iterator<RootListBatch<T>>
{
protected int chunkIndex;
@Override
public boolean hasNext()
{
return this.chunkIndex * ListIterableParallelIterable.this.getBatchSize() < ListIterableParallelIterable.this.delegate.size();
}
@Override
public RootListBatch<T> next()
{
int chunkStartIndex = this.chunkIndex * ListIterableParallelIterable.this.getBatchSize();
int chunkEndIndex = (this.chunkIndex + 1) * ListIterableParallelIterable.this.getBatchSize();
int truncatedChunkEndIndex = Math.min(chunkEndIndex, ListIterableParallelIterable.this.delegate.size());
this.chunkIndex++;
return new ListIterableBatch<>(ListIterableParallelIterable.this.delegate, chunkStartIndex, truncatedChunkEndIndex);
}
@Override
public void remove()
{
throw new UnsupportedOperationException("Cannot call remove() on " + ListIterableParallelIterable.this.delegate.getClass().getSimpleName());
}
}
private class ListIterableParallelBatchLazyIterable
extends AbstractLazyIterable<RootListBatch<T>>
{
@Override
public void each(Procedure<? super RootListBatch<T>> procedure)
{
for (RootListBatch<T> chunk : this)
{
procedure.value(chunk);
}
}
@Override
public Iterator<RootListBatch<T>> iterator()
{
return new ListIterableParallelBatchIterator();
}
}
}