com.google.code.pentahoflashcharts.charts.PentahoOFC4JChartHelper.java Source code

Introduction

Here is the source code for com.google.code.pentahoflashcharts.charts.PentahoOFC4JChartHelper.java

Source

/*
 * This program is free software; you can redistribute it and/or modify it under the 
 * terms of the GNU Lesser General Public License, version 2.1 as published by the Free Software 
 * Foundation.
 *
 * You should have received a copy of the GNU Lesser General Public License along with this 
 * program; if not, you can obtain a copy at http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html 
 * or from the Free Software Foundation, Inc., 
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * This program 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.
 *
 * Copyright 2009 Pentaho Corporation.  All rights reserved.
 */
package com.google.code.pentahoflashcharts.charts;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.Collections;
import java.util.Enumeration;
import java.util.Map;
import java.util.Properties;
import java.util.ResourceBundle;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.dom4j.Node;
import org.pentaho.commons.connection.IPentahoResultSet;
import org.pentaho.commons.connection.PentahoDataTransmuter;
import org.pentaho.platform.api.repository.ISolutionRepository;
import org.pentaho.platform.engine.core.system.PentahoSystem;
import org.pentaho.platform.engine.core.system.StandaloneSession;
import com.google.code.pentahoflashcharts.Messages;

public class PentahoOFC4JChartHelper {

    private static final Log logger = LogFactory.getLog(PentahoOFC4JChartHelper.class);

    private static final String CHART_TYPE_NODE_LOC = "chart-type"; //$NON-NLS-1$
    private static final String CHART_TYPE_DEFAULT = "BarChart"; //$NON-NLS-1$

    private static final String PLUGIN_BUNDLE_NAME = "com.google.code.pentahoflashcharts.charts.chartfactories";//$NON-NLS-1$

    private static final String SOLUTION_PROPS = "system/openflashchart.properties"; //$NON-NLS-1$

    @SuppressWarnings("unchecked")
    static Map factories = null;

    @SuppressWarnings("unchecked")
    public static String generateChartJson(Node chartNode, IPentahoResultSet data, boolean byRow, Log log) {
        String chartType = null;
        String factoryClassString = null;
        try {
            Node temp = chartNode.selectSingleNode(CHART_TYPE_NODE_LOC);
            if (AbstractChartFactory.getValue(temp) != null) {
                chartType = AbstractChartFactory.getValue(temp);
            } else {
                // This should NEVER happen.
                chartType = CHART_TYPE_DEFAULT;
            }

            factoryClassString = (String) getChartFactories().get(chartType);
            if (factoryClassString == null) {
                throw new RuntimeException(Messages.getErrorString(
                        "PentahoOFC4JChartHelper.ERROR_0001_FACTORY_INIT", chartType, factoryClassString)); //$NON-NLS-1$
            } else {

                Class factoryClass = Class.forName(factoryClassString);

                // throw exception if factoryClass not found

                IChartFactory factory = (IChartFactory) factoryClass.getConstructor(new Class[0])
                        .newInstance(new Object[0]);
                factory.setChartNode(chartNode);
                factory.setLog(log);
                if (byRow) {
                    factory.setData(PentahoDataTransmuter.pivot(data));
                } else {
                    factory.setData(data);
                }
                return factory.convertToJson();
            }
        } catch (Exception e) {
            logger.error(Messages.getErrorString("PentahoOFC4JChartHelper.ERROR_0001_FACTORY_INIT", chartType, //$NON-NLS-1$
                    factoryClassString), e);
            throw new RuntimeException(e);
        }
    }

    @SuppressWarnings({ "unchecked" })
    protected static Map getChartFactories() {
        if (factories == null) {
            factories = Collections.synchronizedMap(createChartFactoryMap());
        }
        return factories;
    }

    @SuppressWarnings("unchecked")
    private static Map createChartFactoryMap() {
        Properties chartFactories = new Properties();
        // First, get known chart factories...
        try {
            ResourceBundle pluginBundle = ResourceBundle.getBundle(PLUGIN_BUNDLE_NAME);
            if (pluginBundle != null) { // Copy the bundle here...
                Enumeration keyEnum = pluginBundle.getKeys();
                String bundleKey = null;
                while (keyEnum.hasMoreElements()) {
                    bundleKey = (String) keyEnum.nextElement();
                    chartFactories.put(bundleKey, pluginBundle.getString(bundleKey));
                }
            }
        } catch (Exception ex) {
            logger.warn(Messages.getString("PentahoOFC4JChartHelper.WARN_NO_CHART_FACTORY_PROPERTIES_BUNDLE")); //$NON-NLS-1$
        }
        // Get overrides...
        //
        // Note - If the override wants to remove an existing "known" plugin, 
        // simply adding an empty value will cause the "known" plugin to be removed.
        //
        if (PentahoSystem.getObjectFactory() == null
                || !PentahoSystem.getObjectFactory().objectDefined(ISolutionRepository.class.getSimpleName())) {
            // this is ok
            return chartFactories;
        }
        ISolutionRepository solutionRepository = PentahoSystem.get(ISolutionRepository.class,
                new StandaloneSession("system")); //$NON-NLS-1$
        try {
            if (solutionRepository.resourceExists(SOLUTION_PROPS)) {
                InputStream is = solutionRepository.getResourceInputStream(SOLUTION_PROPS, false);
                Properties overrideChartFactories = new Properties();
                overrideChartFactories.load(is);
                chartFactories.putAll(overrideChartFactories); // load over the top of the known properties
            }
        } catch (FileNotFoundException ignored) {
            logger.warn(Messages.getString("PentahoOFC4JChartHelper.WARN_NO_CHART_FACTORY_PROPERTIES")); //$NON-NLS-1$
        } catch (IOException ignored) {
            logger.warn(Messages.getString("PentahoOFC4JChartHelper.WARN_BAD_CHART_FACTORY_PROPERTIES"), ignored); //$NON-NLS-1$
        }

        return chartFactories;
    }
}