HOGMQueryTask.java

/*
 * Copyright (c) 2015, SRI International
 * All rights reserved.
 * Licensed under the The BSD 3-Clause License;
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 * 
 * http://opensource.org/licenses/BSD-3-Clause
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 
 * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 * 
 * Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 * 
 * Neither the name of the aic-praise nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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package com.sri.ai.praise.sgsolver.demo.service;

import java.util.List;
import java.util.concurrent.atomic.AtomicReference;

import com.google.common.annotations.Beta;
import com.sri.ai.praise.sgsolver.solver.HOGMQueryRunner;
import com.sri.ai.expresso.api.Expression;
import com.sri.ai.praise.sgsolver.demo.SGSolverDemoController;
import com.sri.ai.praise.sgsolver.solver.HOGMQueryResult;

import javafx.concurrent.Task;

@Beta
public class HOGMQueryTask extends Task<HOGMQueryResult> {
	private String query;
	private String model;
	//
	private HOGMQueryRunner hogmQueryRunner = null;
	
	public HOGMQueryTask(String query, String model) {
		this.query = query;
		this.model = model;
	}
	
	@Override
	public HOGMQueryResult call() {
		final AtomicReference<HOGMQueryResult> result = new AtomicReference<>();
		
		SGSolverDemoController.computeExpressionWithDesiredPrecision(() -> {
			hogmQueryRunner = new HOGMQueryRunner(model, query);
			List<HOGMQueryResult> queryResults = hogmQueryRunner.query();
			if (queryResults.size() == 1) {
				HOGMQueryResult queryResult = queryResults.get(0);
				if (queryResult.isErrors()) {
					result.set(queryResult);
				}
				else {
					Expression answer = hogmQueryRunner.simplifyAnswer(queryResult.getResult(), queryResult.getQueryExpression());					
					result.set(new HOGMQueryResult(queryResult.getQueryString(), queryResult.getQueryExpression(), queryResult.getParsedModel(), answer, queryResult.getMillisecondsToCompute()));
				}
			}		
		});		
 
        return result.get();
    }
	
	@Override
	protected void cancelled() {
		if (hogmQueryRunner != null) {
			hogmQueryRunner.cancelQuery();
		}
	}
}