package net.sourceforge.phpeclipse.phpeditor;

/*
 * (c) Copyright IBM Corp. 2000, 2001.
 * All Rights Reserved.
 */

import java.util.Iterator;

import org.eclipse.jface.text.source.IAnnotationModel;

/**
 * Filters problems based on their types.
 */
public class ProblemAnnotationIterator implements Iterator {

	private Iterator fIterator;

	private IProblemAnnotation fNext;

	private boolean fSkipIrrelevants;

	public ProblemAnnotationIterator(IAnnotationModel model,
			boolean skipIrrelevants) {
		fIterator = model.getAnnotationIterator();
		fSkipIrrelevants = skipIrrelevants;
		skip();
	}

	private void skip() {
		while (fIterator.hasNext()) {
			Object next = fIterator.next();
			if (next instanceof IProblemAnnotation) {
				IProblemAnnotation a = (IProblemAnnotation) next;
				if (fSkipIrrelevants) {
					if (a.isRelevant()) {
						fNext = a;
						return;
					}
				} else {
					fNext = a;
					return;
				}
			}
		}
		fNext = null;
	}

	/*
	 * @see Iterator#hasNext()
	 */
	public boolean hasNext() {
		return fNext != null;
	}

	/*
	 * @see Iterator#next()
	 */
	public Object next() {
		try {
			return fNext;
		} finally {
			skip();
		}
	}

	/*
	 * @see Iterator#remove()
	 */
	public void remove() {
		throw new UnsupportedOperationException();
	}
}