DTP ODA XML DRIVER DOWNLOAD

You must write each of the get column methods and get data type methods. The open method is one of the methods observed that you must override. That roughly describes all the objects that are used in the runtime plug-in. Using the plug-in and manifest Extensible Markup Language XML files, the plug-in registers itself as an observer with the data engine. The complete source for the plug-in is available in Download.

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View a larger version of Figure 8. But what is different about the ODA architecture is that several of the observed calls are actually factory calls, requiring the observer to create new objects that are themselves observers.

For a database query, you use a Structured Query Language query. This task allows an application to use a report document as a temporary cache that contains all the bindings, expressions, and aggregations.

Depending on the data source you retrieve, you can override the close method in the IResultSetas well. These plug-ins are fairly complex, but by referencing the ofa project, you can extend BIRT's data-retrieval capabilities.

The BIRT ODA extension point

Remember that editing a data source editor when you click a data source in the BIRT editor does not call this same set of classes: If you followed all of the steps in the wizard, you already set most of the configuration items. It is responsible for opening the data connection to the data source. However, the Connection object has a few methods for you to modify. The Driver class is the root observer for the ODA.

There are two types of plug-ins to write: Comments Sign in or register to add and subscribe to comments. Likewise, the DataSetWizardPage is the first page that is used in data set creation. You can then apply sorts during the retrieval process.

Index of /pub/verinice/target-platform/dtp-sdk/plugins

It serves as a factory object that creates the Connection object. The open method is one of the methods observed that you must override. John Ward Published on November 27, The observer method that you must overwrite is the prepare method, which is responsible for preparing the IQuery odw for execution. At a high level, a few basic types of factories create observers.

The composite that is created calls the DataSourceWizardPage. The task requires the name of a report document and the name of a table with a data set binding. The method returns true if there are remaining rows and false if there are no other rows to return. The factories must generate observers for data source connections, data set queries, parameters, and result sets see Figure 1. The SWT designer goes a long way in easing the development of the layouts of views. The design time UI plug-in is not required, but it is helpful.

The Connection object also serves as a factory for IQuery objects through the newQuery method. I described a mostly straightforward Eclipse view development. BIRT's internal data engine serves as the observed object, and the developer is responsible for creating the observer. Sign in or register to add and subscribe to comments.

It also calls the DataSourceWizardPage.

Pay attention to that little tidbit about the plugin. In the example code, the RptDocPropertyPage. This article walked you through the process of creating two plug-in projects—one for design time and one for runtime. Several different extension points are defined in BIRT.

In previous articles I covered the aggregation and the emitter frameworks see Related topics for links.

Let's consider the runtime plug-in first.