gaprule.java

EclipseTrader is a stock exchange analysis system, featuring shares pricing watch, intraday and hi

/*
 * Copyright (c) 2004-2006 Marco Maccaferri 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:
 *     Marco Maccaferri - initial API and implementation
 */

package net.sourceforge.eclipsetrader.trading.patterns;

import java.util.ArrayList;
import java.util.List;

import net.sourceforge.eclipsetrader.core.IPattern;
import net.sourceforge.eclipsetrader.core.Sentiment;
import net.sourceforge.eclipsetrader.core.db.Bar;
import net.sourceforge.eclipsetrader.core.db.Security;

public class GapRule implements IPattern
{
    List bars = new ArrayList();
    int minimumBars = 3;
    int maximumBars = 3;
    Sentiment sentiment = Sentiment.INVALID;

    public GapRule()
    {
    }

    /* (non-Javadoc)
     * @see net.sourceforge.eclipsetrader.core.IPattern#init(net.sourceforge.eclipsetrader.core.db.Security)
     */
    public void init(Security security)
    {
        bars = new ArrayList();
        sentiment = Sentiment.INVALID;
    }

    /* (non-Javadoc)
     * @see net.sourceforge.eclipsetrader.core.IPattern#getSentiment(net.sourceforge.eclipsetrader.core.db.Bar)
     */
    public void add(Bar bar)
    {
        bars.add(bar);
        if (bars.size() > maximumBars)
            bars.remove(0);

        if (bars.size() >= minimumBars)
        {
            sentiment = Sentiment.NEUTRAL;
            Bar[] recs = (Bar[])bars.toArray(new Bar[bars.size()]);

            if (recs[0].getHigh() < recs[1].getLow() // gap up
                    && closesInTopQuarter(recs[1]) && closesInTopQuarter(recs[2]))
            {
                sentiment = Sentiment.BULLISH;
            }
            else if (recs[1].getHigh() < recs[0].getLow() // gap down
                    && closesInBottomQuarter(recs[1]) && closesInBottomQuarter(recs[2]))
            {
                sentiment = Sentiment.BEARISH;
            }
        }
    }

    /* (non-Javadoc)
     * @see net.sourceforge.eclipsetrader.core.IPattern#getSentiment()
     */
    public Sentiment getSentiment()
    {
        return sentiment;
    }

    private boolean closesInTopQuarter(Bar rec)
    {
        return rec.getClose() >= (rec.getLow() + (rec.getHigh() - rec.getLow()) * 3 / 4);
    }

    private boolean closesInBottomQuarter(Bar rec)
    {
        return rec.getClose() <= (rec.getLow() + (rec.getHigh() - rec.getLow()) / 4);
    }
}