DistanceStream.java

/**
 * Copyright 2012 Kevin J. Jones (http://www.kevinjjones.co.uk)
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package uk.co.kevinjjones.vehicle;

import java.util.ArrayList;
import uk.co.kevinjjones.Log;
import uk.co.kevinjjones.model.*;

/**
 * Distance virtual stream.
 */
public class DistanceStream extends StreamBase {

    private View _view;
    private ROStream _speed;
    private ArrayList<Double> _distance = new ArrayList();

    public DistanceStream() {
    }

    @Override
    public void setView(View view, Object arg, ParamHandler handler, WithError<Boolean, BasicError> ok) {
        super.setView(view, arg, handler, ok);
        _view = view;
        _speed = _view.getStream(SpeedStream.NAME);
        if (_speed == null) {
            ok.setValue(false);
        }
    }

    @Override
    public String name() {
        return "Distance";
    }

    @Override
    public String description() {
        return "Distance";
    }

    @Override
    public String axis() {
        return "Distance";
    }

    @Override
    public String units() {
        return "Meters";
    }

    @Override
    public int size() {
        return _view.getStream(Log.TIME_STREAM).size();
    }

    @Override
    public double getNumeric(int position) throws NumberFormatException {

        while (_distance.size() < position + 1) {
            double speed = _speed.getNumeric(_distance.size());
            switch (isKPH(true)) {
                case 0:
                    speed = 0;    // No declared unit
                    break;
                case 2:         // In miles
                    speed = speed * 1.609;
            }

            if (_distance.isEmpty()) {
                _distance.add((speed * 1000) / 60 / 60 / 10);
            } else {
                _distance.add(_distance.get(_distance.size() - 1) + (speed * 1000) / 60 / 60 / 10);
            }
        }
        return _distance.get(position);
    }
}