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/*******************************************************************************
* Copyright (c) 2009, 2010 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.iterables;
import java.util.List;
import java.util.ListIterator;
import org.eclipse.jpt.common.utility.internal.StringTools;
import org.eclipse.jpt.common.utility.internal.iterators.CompositeListIterator;
import org.eclipse.jpt.common.utility.internal.iterators.TransformationListIterator;
/**
* A <code>CompositeListIterable</code> wraps a {@link ListIterable}
* of {@link ListIterable}s and makes them appear to be a single
* {@link ListIterable}.
*
* @param <E> the type of elements returned by the list iterable's list iterator
*
* @see CompositeListIterator
* @see CompositeIterable
* @see ReadOnlyCompositeListIterable
*/
public class CompositeListIterable<E>
implements ListIterable<E>
{
private final ListIterable<? extends ListIterable<E>> iterables;
/**
* Construct a list iterable with the specified list of list iterables.
*/
public CompositeListIterable(List<ListIterable<E>> iterables) {
this(new ListListIterable<ListIterable<E>>(iterables));
}
/**
* Construct a list iterable with the specified list of list iterables.
*/
public CompositeListIterable(ListIterable<? extends ListIterable<E>> iterables) {
super();
this.iterables = iterables;
}
/**
* Construct a list iterable with the specified object prepended
* to the specified list.
*/
public CompositeListIterable(E object, List<E> list) {
this(object, new ListListIterable<E>(list));
}
/**
* Construct a list iterable with the specified object prepended
* to the specified list iterable.
*/
@SuppressWarnings("unchecked")
public CompositeListIterable(E object, ListIterable<E> iterable) {
this(new SingleElementListIterable<E>(object), iterable);
}
/**
* Construct a list iterable with the specified object appended
* to the specified list.
*/
public CompositeListIterable(List<E> list, E object) {
this(new ListListIterable<E>(list), object);
}
/**
* Construct a list iterable with the specified object appended
* to the specified list iterable.
*/
@SuppressWarnings("unchecked")
public CompositeListIterable(ListIterable<E> iterable, E object) {
this(iterable, new SingleElementListIterable<E>(object));
}
/**
* Construct a list iterable with the specified list iterables.
*/
public CompositeListIterable(ListIterable<E>... iterables) {
this(new ArrayListIterable<ListIterable<E>>(iterables));
}
/**
* Construct a list iterable with the specified lists.
*/
public CompositeListIterable(List<E>... lists) {
this(new TransformationListIterable<List<E>, ListIterable<E>>(new ArrayListIterable<List<E>>(lists)) {
@Override
protected ListIterable<E> transform(List<E> list) {
return new ListListIterable<E>(list);
}
});
}
/**
* combined list iterators
*/
public ListIterator<E> iterator() {
return new CompositeListIterator<E>(this.iterators());
}
/**
* list iterator of list iterators
*/
protected ListIterator<? extends ListIterator<E>> iterators() {
return new TransformationListIterator<ListIterable<E>, ListIterator<E>>(this.iterables()) {
@Override
protected ListIterator<E> transform(ListIterable<E> next) {
return next.iterator();
}
};
}
/**
* list iterator of list iterables
*/
protected ListIterator<? extends ListIterable<E>> iterables() {
return this.iterables.iterator();
}
@Override
public String toString() {
return StringTools.buildToStringFor(this, this.iterables);
}
}
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