reportbuilder/java/org/libreoffice/report/pentaho/StarReportData.java

   1 /*
   2  * This file is part of the LibreOffice project.
   3  *
   4  * This Source Code Form is subject to the terms of the Mozilla Public
   5  * License, v. 2.0. If a copy of the MPL was not distributed with this
   6  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   7  *
   8  * This file incorporates work covered by the following license notice:
   9  *
  10  *   Licensed to the Apache Software Foundation (ASF) under one or more
  11  *   contributor license agreements. See the NOTICE file distributed
  12  *   with this work for additional information regarding copyright
  13  *   ownership. The ASF licenses this file to you under the Apache
  14  *   License, Version 2.0 (the "License"); you may not use this file
  15  *   except in compliance with the License. You may obtain a copy of
  16  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  17  */
  18 package org.libreoffice.report.pentaho;
  19
  20 import org.libreoffice.report.DataSource;
  21
  22 import org.jfree.report.DataSourceException;
  23 import org.jfree.report.ReportData;
  24
  25 public class StarReportData implements ReportData
  26 {
  27
  28     private final DataSource dataSource;
  29     private int currentRow;
  30     private final int rowCount;
  31
  32     public StarReportData(final DataSource dataSource)
  33             throws org.libreoffice.report.DataSourceException
  34     {
  35         if (dataSource == null)
  36         {
  37             throw new NullPointerException();
  38         }
  39         this.dataSource = dataSource;
  40         this.currentRow = 0;
  41         this.rowCount = dataSource.getRowCount();
  42     }
  43
  44     public boolean setCursorPosition(final int row) throws DataSourceException
  45     {
  46         try
  47         {
  48             final boolean ret = dataSource.absolute(row);
  49             if (ret)
  50             {
  51                 currentRow = row;
  52             }
  53             return ret;
  54         }
  55         catch (org.libreoffice.report.DataSourceException e)
  56         {
  57             throw new DataSourceException("Failed to move cursor", e);
  58         }
  59     }
  60
  61     public void close()
  62             throws DataSourceException
  63     {
  64         try
  65         {
  66             dataSource.close();
  67         }
  68         catch (org.libreoffice.report.DataSourceException e)
  69         {
  70             throw new DataSourceException("Failed to close datasource", e);
  71         }
  72     }
  73
  74     public int getCursorPosition()
  75             throws DataSourceException
  76     {
  77         return currentRow;
  78     }
  79
  80     /**
  81      * This operation checks, whether a call to next will be likely to succeed. If
  82      * there is a next data row, this should return true.
  83      */
  84     public boolean isAdvanceable() throws DataSourceException
  85     {
  86         return currentRow < rowCount;
  87     }
  88
  89     public boolean next()
  90             throws DataSourceException
  91     {
  92         try
  93         {
  94             if (dataSource.next())
  95             {
  96                 currentRow += 1;
  97                 return true;
  98             }
  99             return false;
 100         }
 101         catch (org.libreoffice.report.DataSourceException e)
 102         {
 103             throw new DataSourceException("Failed to move cursor", e);
 104         }
 105     }
 106
 107     public Object get(final int column)
 108             throws DataSourceException
 109     {
 110         if (!isReadable())
 111         {
 112             throw new DataSourceException("Failed to query column.");
 113         }
 114
 115         try
 116         {
 117             return dataSource.getObject(column + 1);
 118         }
 119         catch (org.libreoffice.report.DataSourceException e)
 120         {
 121             throw new DataSourceException("Failed to query column.", e);
 122         }
 123     }
 124
 125     public int getColumnCount()
 126             throws DataSourceException
 127     {
 128         try
 129         {
 130             return dataSource.getColumnCount();
 131         }
 132         catch (org.libreoffice.report.DataSourceException e)
 133         {
 134             throw new DataSourceException("Failed to query column count.", e);
 135         }
 136     }
 137
 138     public String getColumnName(final int column)
 139             throws DataSourceException
 140     {
 141         try
 142         {
 143             return dataSource.getColumnName(column + 1);
 144         }
 145         catch (org.libreoffice.report.DataSourceException e)
 146         {
 147             throw new DataSourceException("Failed to query column name.", e);
 148         }
 149     }
 150
 151     public boolean isReadable() throws DataSourceException
 152     {
 153         return currentRow > 0 && rowCount > 0;
 154     }
 155 }