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/*
* @(#)DefaultSearchQuery.java 1.7 06/10/30
*
* Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Sun designates this
* particular file as subject to the "Classpath" exception as provided
* by Sun in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
* have any questions.
*/
/*
* @(#) DefaultSearchQuery.java 1.7 - last change made 10/30/06
*/
package com.sun.java.help.search;
import java.io.*;
import java.net.*;
import java.text.*;
import java.util.Vector;
import java.util.Hashtable;
import java.util.EventListener;
import java.util.Locale;
import javax.help.search.*;
import com.sun.java.help.search.*;
import java.security.InvalidParameterException;
/**
* DefaultSearchQuery is the query using the default search engine.
*
* Search results are returned through SearchEvents to
* listeners that register with this instance.
*
* @author Roger D. Brinkley
* @author Eduardo Pelegri-Llopart
* @version 1.7 10/30/06
*
* @see javax.help.search.SearchEngine
* @see javax.help.search.SearchQuery
* @see javax.help.search.SearchEvent
* @see javax.help.search.SearchListener
*/
public class DefaultSearchQuery extends SearchQuery implements Runnable {
private Thread thread = null;
private DefaultSearchEngine dhs;
/**
* Create a DefaultSearchEngine
*/
public DefaultSearchQuery(SearchEngine hs) {
super(hs);
if (hs instanceof DefaultSearchEngine) {
dhs = (DefaultSearchEngine) hs;
}
}
/**
* Starts the search. The implementation is up to subclasses of SearchEngine.
* This method will invoke searchStarted on SearchListeners.
* @exception IllegalArgumentException The parameters are not
* understood by this engine
* @exception IllegalStateException There is an active search in progress in this instance
*/
public void start(String searchparams, Locale l)
throws IllegalArgumentException, IllegalStateException
{
debug ("Starting Search");
if (isActive()) {
throw new IllegalStateException();
}
// initialization
super.start(searchparams, l);
// Actually do the search
thread = new Thread(this, "QueryThread");
thread.start();
}
/**
* Stops the search. The implementation is up to the subcalsses of
* SearchEngine. This method will invoke searchStopped on
* SearchListeners.
*/
public void stop() throws IllegalArgumentException, IllegalStateException {
debug ("Stop Search");
// Can no longer do a stop
// Let it continue to operate until it's completed
// on it's own. This is due to to the enherent problem
// with thread.stop
}
public boolean isActive() {
if (thread == null) {
return false;
}
return thread.isAlive();
}
public void run() throws IllegalArgumentException{
QueryEngine qe = dhs.getQueryEngine();
try {
qe.processQuery(searchparams, l, this);
} catch (Exception e) {
e.printStackTrace();
throw new IllegalArgumentException();
}
fireSearchFinished();
thread = null;
}
/**
* For printf debugging.
*/
private static final boolean debugFlag = false;
private static void debug(String str) {
if( debugFlag ) {
System.out.println("DefaultSearchQuery: " + str);
}
}
}
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