/*
 * This file is part of the LibreOffice project.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * This file incorporates work covered by the following license notice:
 *
 *   Licensed to the Apache Software Foundation (ASF) under one or more
 *   contributor license agreements. See the NOTICE file distributed
 *   with this work for additional information regarding copyright
 *   ownership. The ASF licenses this file to you 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 .
 */
package org.libreoffice.report.pentaho;

import org.libreoffice.report.DataSourceException;
import org.libreoffice.report.DataSourceFactory;

import java.util.HashMap;

import org.jfree.report.DataSet;
import org.jfree.report.ReportData;
import org.jfree.report.ReportDataFactory;
import org.jfree.report.ReportDataFactoryException;


public class StarReportDataFactory implements ReportDataFactory, Cloneable
{

    private final DataSourceFactory backend;

    public StarReportDataFactory(DataSourceFactory backend)
    {
        this.backend = backend;
    }

    /**
     * Queries a datasource. The string 'query' defines the name of the query. The
     * Parameterset given here may contain more data than actually needed.
     *
     * <p>The dataset may change between two calls, do not assume anything!</p>
     */
    public ReportData queryData(final String query, final DataSet parameters)
            throws ReportDataFactoryException
    {
        try
        {
            final HashMap<String, Object> map = new HashMap<String, Object>();
            final int count = parameters.getColumnCount();
            for (int i = 0; i < count; i++)
            {
                final Object o = parameters.get(i);
                map.put(parameters.getColumnName(i), o);
            }
            return new StarReportData(backend.queryData(query, map));
        }
        catch (DataSourceException dse)
        {
            String message = dse.getMessage();
            if (message.length() == 0)
            {
                message = "Failed to create report data wrapper";
            }
            throw new ReportDataFactoryException(message, dse);
        }
        catch (org.jfree.report.DataSourceException e)
        {
            String message = e.getMessage();
            if (message.length() == 0)
            {
                message = "Failed to query data";
            }
            throw new ReportDataFactoryException(message, e);
        }
    }

    public void open()
    {
    }

    public void close()
    {
    }

    /**
     * Derives a freshly initialized report data factory, which is independent of
     * the original data factory. Opening or Closing one data factory must not
     * affect the other factories.
     */
    public ReportDataFactory derive()
    {
        try
        {
            return (ReportDataFactory) clone();
        }
        catch (CloneNotSupportedException e)
        {
            throw new IllegalStateException(e);
        }
    }

    @Override
    public Object clone() throws CloneNotSupportedException
    {
        return super.clone();
    }
}
