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/*******************************************************************************
 * Copyright (c) 2000, 2005 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
 *     Sergey Prigogin (Google)
 *******************************************************************************/
package org.eclipse.cdt.ui.text;

import org.eclipse.core.runtime.CoreException;

/**
 * Interface to be implemented by contributors to the extension point
 * <code>org.eclipse.cdt.ui.quickAssistProcessors</code>.
 *
 * @since 5.1
 */
public interface IQuickAssistProcessor {

	/**
	 * Evaluates if quick assists can be created for the given context. This evaluation must be precise.
	 *
	 * @param context The invocation context
	 * @return Returns <code>true</code> if quick assists can be created
	 * @throws CoreException CoreException can be thrown if the operation fails
	 */
	boolean hasAssists(IInvocationContext context) throws CoreException;

	/**
	 * Collects quick assists for the given context.
	 *
	 * @param context Defines current translation unit, position and a shared AST
	 * @param locations The locations of problems at the invocation offset. The processor can decide to only
	 * 			add assists when there are no errors at the selection offset.
	 * @return Returns the assists applicable at the location or <code>null</code> if no proposals
	 * 			can be offered.
	 * @throws CoreException CoreException can be thrown if the operation fails
	 */
	ICCompletionProposal[] getAssists(IInvocationContext context, IProblemLocation[] locations) throws CoreException;
}

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