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/*******************************************************************************
* Copyright (c) 2009, 2013 Oracle. All rights reserved.
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0, which accompanies this distribution
* and is available at http://www.eclipse.org/legal/epl-v10.html.
*
* Contributors:
* Oracle - initial API and implementation
******************************************************************************/
package org.eclipse.jpt.common.utility.internal.iterable;
import java.util.Iterator;
import org.eclipse.jpt.common.utility.internal.collection.ListTools;
import org.eclipse.jpt.common.utility.internal.iterator.CompositeIterator;
import org.eclipse.jpt.common.utility.internal.iterator.IteratorTools;
import org.eclipse.jpt.common.utility.transformer.Transformer;
/**
* A <code>CompositeIterable</code> wraps an {@link Iterable}
* of {@link Iterable}s and makes them appear to be a single
* {@link Iterable}.
*
* @param <E> the type of elements returned by the iterable's iterator
*
* @see CompositeIterator
* @see CompositeListIterable
*/
public class CompositeIterable<E>
implements Iterable<E>
{
private final Iterable<? extends Iterable<? extends E>> iterables;
/**
* Construct an iterable with the specified collection of iterables.
*/
public CompositeIterable(Iterable<? extends Iterable<? extends E>> iterables) {
super();
if (iterables == null) {
throw new NullPointerException();
}
this.iterables = iterables;
}
/**
* combined iterators
*/
public Iterator<E> iterator() {
return new CompositeIterator<E>(this.iterators());
}
/**
* iterator of iterators
*/
protected Iterator<? extends Iterator<? extends E>> iterators() {
Transformer<Iterable<? extends E>, Iterator<E>> transformer = IterableTools.iteratorTransformer();
return IteratorTools.transform(this.iterables(), transformer);
}
/**
* iterator of iterables
*/
protected Iterator<? extends Iterable<? extends E>> iterables() {
return this.iterables.iterator();
}
@Override
public String toString() {
return ListTools.list(this).toString();
}
}
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