pageviewcountdata.java

cewolf是个一个自动报表程序

/* ================================================================
 * Cewolf : Chart enabling Web Objects Framework
 * ================================================================
 *
 * Project Info:  http://cewolf.sourceforge.net
 * Project Lead:  Guido Laures ([e-mail]);
 *
 * (C) Copyright 2002, by Guido Laures
 *
 * This library is free software; you can redistribute it and/or modify it under the terms
 * of the GNU Lesser General Public License as published by the Free Software Foundation;
 * either version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License along with this
 * library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307, USA.
 */

package de.laures.cewolf.example;

import java.io.Serializable;
import java.util.Date;
import java.util.Map;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.jfree.data.category.CategoryDataset;
import org.jfree.data.category.DefaultCategoryDataset;

import de.laures.cewolf.DatasetProduceException;
import de.laures.cewolf.DatasetProducer;
import de.laures.cewolf.links.CategoryItemLinkGenerator;
import de.laures.cewolf.tooltips.CategoryToolTipGenerator;

/** 
 * An example data producer.
 * @author  Guido Laures 
 */
public class PageViewCountData implements DatasetProducer, CategoryToolTipGenerator, CategoryItemLinkGenerator, Serializable {

    private static final Log log = LogFactory.getLog(PageViewCountData.class);

    // These values would normally not be hard coded but produced by
    // some kind of data source like a database or a file
    private final String[] categories =    {"mon", "tue", "wen", "thu", "fri", "sat", "sun"};
    private final String[] seriesNames =    {"cewolfset.jsp", "tutorial.jsp", "testpage.jsp", "performancetest.jsp"};

	/**
	 *  Produces some random data.
	 */
    public Object produceDataset(Map params) throws DatasetProduceException {
    	log.debug("producing data.");
        DefaultCategoryDataset dataset = new DefaultCategoryDataset(){
			/**
			 * @see java.lang.Object#finalize()
			 */
			protected void finalize() throws Throwable {
				super.finalize();
				log.debug(this +" finalized.");
			}
        };
        for (int series = 0; series < seriesNames.length; series ++) {
            int lastY = (int)(Math.random() * 1000 + 1000);
            for (int i = 0; i < categories.length; i++) {
                final int y = lastY + (int)(Math.random() * 200 - 100);
                lastY = y;
                dataset.addValue(y, seriesNames[series], categories[i]);
            }
        }
        return dataset;
    }

    /**
     * This producer's data is invalidated after 5 seconds. By this method the
     * producer can influence Cewolf's caching behaviour the way it wants to.
     */
	public boolean hasExpired(Map params, Date since) {		
        log.debug(getClass().getName() + "hasExpired()");
		return (System.currentTimeMillis() - since.getTime())  > 5000;
	}

	/**
	 * Returns a unique ID for this DatasetProducer
	 */
	public String getProducerId() {
		return "PageViewCountData DatasetProducer";
	}

    /**
     * Returns a link target for a special data item.
     */
    public String generateLink(Object data, int series, Object category) {
        return seriesNames[series];
    }
    
	/**
	 * @see java.lang.Object#finalize()
	 */
	protected void finalize() throws Throwable {
		super.finalize();
		log.debug(this + " finalized.");
	}

	/**
	 * @see org.jfree.chart.tooltips.CategoryToolTipGenerator#generateToolTip(CategoryDataset, int, int)
	 */
	public String generateToolTip(CategoryDataset arg0, int series, int arg2) {
		return seriesNames[series];
	}

}