/*******************************************************************************
 * Copyright (c) 2006, 2008 IBM Corporation and others.
 * 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:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.jface.text.quickassist;

import org.eclipse.core.runtime.AssertionFailedException;

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


/**
 * Allows an annotation to tell whether there are quick fixes
 * for it and to cache that state.
 * <p>
 * Caching the state is important to improve overall performance as calling
 * {@link org.eclipse.jface.text.quickassist.IQuickAssistAssistant#canFix(Annotation)}
 * can be expensive.
 * </p>
 * <p>
 * This interface can be implemented by clients.</p>
 *
 * @since 3.2
 */
public interface IQuickFixableAnnotation {

	/**
	 * Sets whether there are quick fixes available for
	 * this annotation.
	 *
	 * @param state <code>true</code> if there are quick fixes available, false otherwise
	 */
	void setQuickFixable(boolean state);

	/**
	 * Tells whether the quick fixable state has been set.
	 * <p>
	 * Normally this means {@link #setQuickFixable(boolean)} has been
	 * called at least once but it can also be hard-coded, e.g. always
	 * return <code>true</code>.
	 * </p>
	 *
	 * @return <code>true</code> if the state has been set
	 */
	boolean isQuickFixableStateSet();

	/**
	 * Tells whether there are quick fixes for this annotation.
	 * <p>
	 * <strong>Note:</strong> This method must only be called
	 * if {@link #isQuickFixableStateSet()} returns <code>true</code>.</p>
	 *
	 * @return <code>true</code> if this annotation offers quick fixes
	 * @throws AssertionFailedException if called when {@link #isQuickFixableStateSet()} is <code>false</code>
	 */
	boolean isQuickFixable() throws AssertionFailedException;

}
