利用Java写birt的eventhandler

birt的各种对象，包括数据源（datasource）、数据集（dataset）及各种报表元素（report item）都可以添加eventhandler对象，实现对这些对象的事件的响应。eventhandler实现的方式有两种：JavaScript语言和Java语言。由于Java的可调试性，开发起来相对方便一些，我这里利用Java开发了dataset的一个eventhandler：

mport java.util.List;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.eclipse.birt.report.engine.api.script.IUpdatableDataSetRow;
import org.eclipse.birt.report.engine.api.script.ScriptException;
import org.eclipse.birt.report.engine.api.script.eventadapter.ScriptedDataSetEventAdapter;
import org.eclipse.birt.report.engine.api.script.instance.IDataSetInstance;

import com.tkxing.htmlparser.buss.report.model.BaseReportModel;
import com.tkxing.htmlparser.buss.report.model.SingleStockDataReportModel;

public class ScriptedDataSetEventHandler extends ScriptedDataSetEventAdapter {

 Log log = LogFactory.getLog(ScriptedDataSetEventHandler.class);
 private int num = 0;
 private int total = 0;
 private List dataList;

 @Override
 public void open(IDataSetInstance dataSet) {
  // TODO Auto-generated method stub
  super.open(dataSet);

  BaseReportModel reportModel = new SingleStockDataReportModel();
  dataList = (List) reportModel.getModel();
  this.total = dataList.size();

 }

 @Override
 public boolean fetch(IDataSetInstance dataSet, IUpdatableDataSetRow row) {
  // TODO Auto-generated method stub
  try {
   if (num >= total) {
    return false;
   }
   String[] dataRow = (String[]) this.dataList.get(num);
   for (int i = 1; i <= dataRow.length; i++) {
    row.setColumnValue(i, dataRow[i - 1]);
    System.out.println(i + " = " + dataRow[i - 1]);
    
   }
   num++;
  } catch (ScriptException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }

  return true;
  // return super.fetch(dataSet, row);

 }

}

 

数据模式reportModel代码如下：

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

public class SingleStockDataReportModel extends BaseReportModel {
 
 private List dataList;

 public SingleStockDataReportModel() {
  // TODO Auto-generated constructor stub
  
  this.dataList = new ArrayList();

  
  for(int i=0;i<10;i++)
  {
   String []rowData = new String[3];
   for(int j=0;j<rowData.length;j++)
   {
    rowData[j] = new String(new Integer(i*10+j).toString());
   }
   this.dataList.add(rowData);
  }
  
 }

 public List getDataList() {

/*  
  this.dataList = new ArrayList();
  
  
  for(int i=0;i<10;i++)
  {
   String []rowData = new String[3];

   for(int j=0;j<rowData.length;j++)
   {
    rowData[j] = new String(new Integer(i*10+j).toString());
   }
   
   dataList.add(rowData);
  }
*/
  return (dataList);
 }

 public void setDataList(List dataList) {
  this.dataList = dataList;
 }

 @Override
 public Object getModel() {
  // TODO Auto-generated method stub
  return this.dataList;
 }

}

利用birt的ReportEngine输出报表或者通过URL访问报表，在相应的位置设置断点，就可以实现对eventhandler的调试了。

测试的report.rptdesign如下：

<?xml version="1.0" encoding="UTF-8"?>
<report xmlns="http://www.eclipse.org/birt/2005/design" version="3.2.15" id="1">
    <data-sources>
        <script-data-source name="ScriptedDataSource" id="5"/>
    </data-sources>
    <data-sets>
        <script-data-set name="ScriptedDataSet" id="6">
            <property name="eventHandlerClass">com.tkxing.htmlparser.presentation.report.ScriptedDataSetEventHandler</property>
            <list-property name="resultSetHints">
                <structure>
                    <property name="position">1</property>
                    <property name="name">rs1</property>
                    <property name="dataType">string</property>
                </structure>
                <structure>
                    <property name="position">2</property>
                    <property name="name">rs2</property>
                    <property name="dataType">string</property>
                </structure>
                <structure>
                    <property name="position">3</property>
                    <property name="name">rs3</property>
                    <property name="dataType">string</property>
                </structure>
            </list-property>
            <list-property name="columnHints">
                <structure>
                    <property name="columnName">rs1</property>
                </structure>
                <structure>
                    <property name="columnName">rs2</property>
                </structure>
                <structure>
                    <property name="columnName">rs3</property>
                </structure>
            </list-property>
            <property name="dataSource">ScriptedDataSource</property>
        </script-data-set>
    </data-sets>
    <styles>
        <style name="crosstab" id="2">
            <property name="borderBottomColor">#CCCCCC</property>
            <property name="borderBottomStyle">solid</property>
            <property name="borderBottomWidth">1pt</property>
            <property name="borderLeftColor">#CCCCCC</property>
            <property name="borderLeftStyle">solid</property>
            <property name="borderLeftWidth">1pt</property>
            <property name="borderRightColor">#CCCCCC</property>
            <property name="borderRightStyle">solid</property>
            <property name="borderRightWidth">1pt</property>
            <property name="borderTopColor">#CCCCCC</property>
            <property name="borderTopStyle">solid</property>
            <property name="borderTopWidth">1pt</property>
        </style>
        <style name="crosstab-cell" id="3">
            <property name="borderBottomColor">#CCCCCC</property>
            <property name="borderBottomStyle">solid</property>
            <property name="borderBottomWidth">1pt</property>
            <property name="borderLeftColor">#CCCCCC</property>
            <property name="borderLeftStyle">solid</property>
            <property name="borderLeftWidth">1pt</property>
            <property name="borderRightColor">#CCCCCC</property>
            <property name="borderRightStyle">solid</property>
            <property name="borderRightWidth">1pt</property>
            <property name="borderTopColor">#CCCCCC</property>
            <property name="borderTopStyle">solid</property>
            <property name="borderTopWidth">1pt</property>
        </style>
    </styles>
    <page-setup>
        <simple-master-page name="Page Master" id="4"/>
    </page-setup>
    <body>
        <table name="table" id="7">
            <property name="width">100%</property>
            <property name="dataSet">ScriptedDataSet</property>
            <list-property name="boundDataColumns">
                <structure>
                    <property name="name">rs1</property>
                    <expression name="expression">dataSetRow["rs1"]</expression>
                </structure>
                <structure>
                    <property name="name">rs2</property>
                    <expression name="expression">dataSetRow["rs2"]</expression>
                </structure>
                <structure>
                    <property name="name">rs3</property>
                    <expression name="expression">dataSetRow["rs3"]</expression>
                </structure>
            </list-property>
            <column id="26"/>
            <column id="27"/>
            <column id="28"/>
            <header>
                <row id="8">
                    <cell id="9">
                        <label name="rs1" id="10">
                            <text-property name="text">rs1</text-property>
                        </label>
                    </cell>
                    <cell id="11">
                        <label name="rs2" id="12">
                            <text-property name="text">rs2</text-property>
                        </label>
                    </cell>
                    <cell id="13">
                        <label name="rs3" id="14">
                            <text-property name="text">rs3</text-property>
                        </label>
                    </cell>
                </row>
            </header>
            <detail>
                <row id="15">
                    <cell id="16">
                        <data name="data_rs1" id="17">
                            <property name="resultSetColumn">rs1</property>
                        </data>
                    </cell>
                    <cell id="18">
                        <data name="data_rs2" id="19">
                            <property name="resultSetColumn">rs2</property>
                        </data>
                    </cell>
                    <cell id="20">
                        <data name="data_rs3" id="21">
                            <property name="resultSetColumn">rs3</property>
                        </data>
                    </cell>
                </row>
            </detail>
            <footer>
                <row id="22">
                    <cell id="23"/>
                    <cell id="24"/>
                    <cell id="25"/>
                </row>
            </footer>
        </table>
    </body>
</report>
测试的结果如图：

 

rs1                      rs2                                 rs3

0                         1                                      2

10                       11                                  12

20                       21                                  22