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A data source control is a .NET Framework class that facilitates the binding of data between data stores and data-bound controls both existing controls such as the DataGrid and new data-bound controls such as GridView, TreeView, and DetailsView. Let s have a look at the plumbing that makes data source controls work as expected. A data source control represents one or more named views of data. Each view provides an enumeration of data objects (such as collections, DataSet, or business objects). The contents of the data source are managed through SQLlike statements such as SELECT, INSERT, DELETE, and UPDATE. Data source controls inherit the base class Control and come in two flavors tabular and hierarchical. The DataSourceControl abstract class serves as the base class for all data source controls and defines the interface between data-bound controls and the underlying data. Although the data source control has no visual rendering, it is implemented as a control to allow for declarative persistence (automatic instantiation during the request processing) as a native part of the .aspx source code and to gain access to the page view state. A data source control exposes the contents of its underlying data source through a set of properties and methods. Some of these members are specific to

The BuildLogger interface builds upon its parent BuildListener by adding access to the output and error print streams. Two other additional methods that the BuildLogger interface extends beyond BuildListener allow for setting emacs mode and the message output level. The DefaultLogger uses the emacs mode to provide output formatted for IDE integration, as the emacs representation of error locations in files is something most IDEs can parse. The message output level is used by DefaultLogger to filter the output based on the logging level. An Ant project can only have one associated BuildLogger. Because the logger has access to the error and output print streams, only one attached logger makes sense. The command line allows specification of a BuildLogger via the -logger switch. Using -emacs enables emacs mode. The -quiet, -verbose, and -debug switches specify the logging level. The default output level used is informational, which is between the quiet and verbose options with respect to the output generated. The BuildLogger is attached internally as a listener to the project, so that it receives the events exactly like any attached listeners.

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There is some console output from Ant that occurs prior to the involvement of the logger or listeners that cannot be captured by using them. If an error occurs outside the scope of the project (e.g., a missing build.xml), this output will only be available in the console or log file.

Writing a custom listener The example listener we demonstrate here was written by Erik during the development of this book, contributed to the Ant codebase, and is already available in the Ant distribution. This custom listener is a wrapper for the Jakarta Commons Logging API, which itself is a fa ade over several popular logging APIs, including Log4j, LogKit, and Java 1.4 s logging facility. The documentation, source, and binaries of this library are available at http://jakarta.apache.org/commons/logging.html. Listing 20.2 shows our implementation of a BuildListener that hands off build events to this logging fa ade.

<!-- Extend clean process to delete created files --> <PropertyGroup> <CleanDependsOn> $(CleanDependsOn); CustomAfterClean </CleanDependsOn> </PropertyGroup>

the control; others are common to all source controls and are defined as part of the IDataSource interface.

package org.apache.tools.ant.listener; import import import import import import import import org.apache.commons.logging.Log; org.apache.commons.logging.LogConfigurationException; org.apache.commons.logging.LogFactory; org.apache.tools.ant.BuildEvent; org.apache.tools.ant.BuildListener; org.apache.tools.ant.Project; org.apache.tools.ant.Target; org.apache.tools.ant.Task;

* Note: do not use the SimpleLog as your logger implementation as it * causes an infinite loop since it writes to System.err, which Ant traps * and reroutes to the logger/listener layer. * * @author Erik Hatcher * @since Ant 1.5 */ public class CommonsLoggingListener implements BuildListener { private boolean initialized = false; private LogFactory logFactory; public CommonsLoggingListener() { try { logFactory = LogFactory.getFactory(); } catch (LogConfigurationException e) { e.printStackTrace(System.err); return; } initialized = true; } public void buildStarted(BuildEvent event) { if (initialized) { Log log = logFactory.getInstance(Project.class); log.info("Build started."); } } public void buildFinished(BuildEvent event) { if (initialized) { Log log = logFactory.getInstance(Project.class); if (event.getException() == null) { log.info("Build finished."); } else { log.error("Build finished with error.", event.getException()); } } } public void targetStarted(BuildEvent event) { if (initialized) { Log log = logFactory.getInstance(Target.class); log.info("Target \"" + event.getTarget().getName() + "\" started."); } } public void targetFinished(BuildEvent event) { if (initialized) { String targetName = event.getTarget().getName();

All data source controls implement the IDataSource interface. Therefore, this interface is the only prerequisite to creating your own custom ASP.NET data source control. A data source control uses the interface s properties and methods to expose the bound content as a set of named views. The IDataSource interface provides the basic set of capabilities to retrieve views of data out of a data source.

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