How to Develop an Application Using the Eclipse BIRT Design Engine API
Creating a customized report design application
Apr. 30, 2007 07:45 AM
How To Change a Complex Property of a Report Item
Adding a Report Item to a Report Design Programmatically
The class that creates new elements, such as report items, in a report design is ElementFactory. This class provides methods of the form, newXXX( ), where XXX is the report item or element to create. The method newElement( ) is a generic method that creates an element of any type. To access the element factory, call the ReportDesign.getElementFactory( ) method.
You can place new report items at the top level of the report design, directly in the Body slot, in containers such as a cell in a table or grid, or on the master page. You can add a simple item, such as a label, or complex items, such as a table with contents in its cells. Wherever you add a new report item, the location is a slot, such as the body slot of the report design or a cell slot in a row in a table. To add a report item to a slot, you use one of the SlotHandle.add( ) methods. The method has two signatures that support adding the report item to the end of a slot, or to a particular position in a slot.
Table and list elements are container items that iterate over the rows that a data set provides. For these report items to access the data rows, you must bind them to a data set. The table or list element provides data rows to the report items that it contains. For this reason, you usually bind only the container item to a data set, as described later in this article.
How To Add a Grid Item and Label Item to a Report Design
Accessing a Data Source and Data Set with the API
You access the report design's data sources and data sets from methods on the ReportDesignHandle instance in a way similar to other report elements. The model classes that define a data source and data set are DataSourceHandle and DataSetHandle, respectively. A data set provides a report item such as a table with data from a data source. For a report item to access the data set, use the setDataSet() method.
You can use a finder method on the report design handle to access a data source or data set by name. The finder methods are findDataSource( ) and findDataSet( ), respectively.
Alternatively, to access all the data sources or data sets, you can use a getter method that returns a slot handle. The getter methods are getDataSources( ) and getDataSets( ), respectively. To access the individual data sources or data sets in a slot handle, you iterate over the contents of the slot handle in the same way as for any other slot handle.
Data Source Classes
The two subclasses of DataSourceHandle, OdaDataSourceHandle and ScriptDataSourceHandle, provide the functionality for the two families of BIRT data sources. For more information about ODA data sources, see the Javadoc for the ODA API in the Open Data Access (ODA) 3.0.0 API Reference. The scripting methods for a scripted data source fully define the data source.
Data Set Classes
The two subclasses of DataSetHandle, OdaDataSetHandle and ScriptDataSetHandle, provide the functionality for the two families of BIRT data sets. For more information about ODA data sets, see the Javadoc for the ODA API.
Using a Data Set Programmatically
Changing the Properties of a Data Set
How To Change the Data Source for a Data Set
Alternatively, use the getDataSets( ) and getDataSources( ) methods. Then use the technique for iterating over the contents of a slot handle. The variable, design, is a ReportDesignHandle object.
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