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/*******************************************************************************
* Copyright (c) 2005, 2009 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.iterators;
import java.util.Arrays;
import java.util.Iterator;
import java.util.NoSuchElementException;
import org.eclipse.jpt.common.utility.internal.StringTools;
/**
* An <code>ArrayIterator</code> provides an {@link Iterator}
* for an array of objects of type <code>E</code>.
*
* @param <E> the type of elements returned by the iterator
*
* @see org.eclipse.jpt.common.utility.internal.iterables.ArrayIterable
*/
public class ArrayIterator<E>
implements Iterator<E>
{
final E[] array; // private-protected
int cursor; // private-protected
private final int max;
/**
* Construct an iterator for the specified array.
*/
public ArrayIterator(E... array) {
this(array, 0, array.length);
}
/**
* Construct an iterator for the specified array,
* starting at the specified start index and continuing for
* the rest of the array.
*/
public ArrayIterator(E[] array, int start) {
this(array, start, array.length - start);
}
/**
* Construct an iterator for the specified array,
* starting at the specified start index and continuing for
* the specified length.
*/
public ArrayIterator(E[] array, int start, int length) {
super();
if ((start < 0) || (start > array.length)) {
throw new IllegalArgumentException("start: " + start); //$NON-NLS-1$
}
if ((length < 0) || (length > array.length - start)) {
throw new IllegalArgumentException("length: " + length); //$NON-NLS-1$
}
this.array = array;
this.cursor = start;
this.max = start + length;
}
public boolean hasNext() {
return this.cursor != this.max;
}
public E next() {
if (this.hasNext()) {
return this.array[this.cursor++];
}
throw new NoSuchElementException();
}
public void remove() {
throw new UnsupportedOperationException();
}
@Override
public String toString() {
return StringTools.buildToStringFor(this, Arrays.toString(this.array));
}
}
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