/*******************************************************************************
* Copyright (c) 2000, 2015 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.help.search;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IProgressMonitor;
/**
* A search engine that is a participant in the help search. All engines
* selected by the user to run are executed as background jobs using the same
* search expression. Engine is expected to accept the expression and the scope
* object. The results should be passed to the result collector object, and the
* search progress should be tracked by the progress monitor.
* <p>
* Search engines that have API access to the search server can provide a list
* of individual search results. Search engines for which only the URL is known
* are expected to return one search result containing a URL that is sufficient
* to open a web browser and see the search results there.
* <p>
* Search engine must be cancelable.
* <p>This interface is intended to be implemented by clients.
*
* @since 3.1
*/
public interface ISearchEngine {
/**
*
* @param query
* the search expression
* @param scope
* the engine-specific scope object that is used to narrow the
* search or <code>null</code> if the default scope is assumed.
* @param collector
* the search result collector handles results as they arrive
* @param monitor
* progress monitor to track the search progress
* @throws CoreException
* when there are problems in the engine
*/
void run(String query, ISearchScope scope,
ISearchEngineResultCollector collector, IProgressMonitor monitor)
throws CoreException;
}