org.apache.tools.ant

## Class XmlLogger

- java.lang.Object
- - org.apache.tools.ant.XmlLogger

- All Implemented Interfaces:
    java.util.EventListener, BuildListener, BuildLogger

      public class XmlLogger
      extends java.lang.Object
      implements BuildLogger

  Generates a file in the current directory with an XML description of what happened during a build. The default filename is "log.xml", but this can be overridden with the property `XmlLogger.file`. This implementation assumes in its sanity checking that only one thread runs a particular target/task at a time. This is enforced by the way that parallel builds and antcalls are done - and indeed all but the simplest of tasks could run into problems if executed in parallel.
  See Also:
    `Project.addBuildListener(BuildListener)`

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `XmlLogger()` Constructs a new BuildListener that logs build events to an XML file.

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `buildFinished(BuildEvent event)` Fired when the build finishes, this adds the time taken and any error stacktrace to the build element and writes the document to disk.
    `void` | `buildStarted(BuildEvent event)` Fired when the build starts, this builds the top-level element for the document and remembers the time of the start of the build.
    `void` | `messageLogged(BuildEvent event)` Fired when a message is logged, this adds a message element to the most appropriate parent element (task, target or build) and records the priority and text of the message.
    `void` | `setEmacsMode(boolean emacsMode)` Ignore emacs mode, as it has no meaning in XML format
    `void` | `setErrorPrintStream(java.io.PrintStream err)` Ignore error print stream.
    `void` | `setMessageOutputLevel(int level)` Set the logging level when using this as a Logger
    `void` | `setOutputPrintStream(java.io.PrintStream output)` Set the output stream to which logging output is sent when operating as a logger.
    `void` | `targetFinished(BuildEvent event)` Fired when a target finishes building, this adds the time taken and any error stacktrace to the appropriate target element in the log.
    `void` | `targetStarted(BuildEvent event)` Fired when a target starts building, this pushes a timed element for the target onto the stack of elements for the current thread, remembering the current time and the name of the target.
    `void` | `taskFinished(BuildEvent event)` Fired when a task finishes building, this adds the time taken and any error stacktrace to the appropriate task element in the log.
    `void` | `taskStarted(BuildEvent event)` Fired when a task starts building, this pushes a timed element for the task onto the stack of elements for the current thread, remembering the current time and the name of the task.

    - ### Methods inherited from class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Constructor Detail

    - #### XmlLogger

          public XmlLogger()

      Constructs a new BuildListener that logs build events to an XML file.

  - ### Method Detail

    - #### buildStarted

          public void buildStarted(BuildEvent event)

      Fired when the build starts, this builds the top-level element for the document and remembers the time of the start of the build.
      Specified by:
        `buildStarted` in interface `BuildListener`
      Parameters:
        `event` - Ignored.

    - #### buildFinished

          public void buildFinished(BuildEvent event)

      Fired when the build finishes, this adds the time taken and any error stacktrace to the build element and writes the document to disk.
      Specified by:
        `buildFinished` in interface `BuildListener`
      Parameters:
        `event` - An event with any relevant extra information. Will not be `null`.
      See Also:
        `BuildEvent.getException()`

    - #### targetStarted

          public void targetStarted(BuildEvent event)

      Fired when a target starts building, this pushes a timed element for the target onto the stack of elements for the current thread, remembering the current time and the name of the target.
      Specified by:
        `targetStarted` in interface `BuildListener`
      Parameters:
        `event` - An event with any relevant extra information. Will not be `null`.
      See Also:
        `BuildEvent.getTarget()`

    - #### targetFinished

          public void targetFinished(BuildEvent event)

      Fired when a target finishes building, this adds the time taken and any error stacktrace to the appropriate target element in the log.
      Specified by:
        `targetFinished` in interface `BuildListener`
      Parameters:
        `event` - An event with any relevant extra information. Will not be `null`.
      See Also:
        `BuildEvent.getException()`

    - #### taskStarted

          public void taskStarted(BuildEvent event)

      Fired when a task starts building, this pushes a timed element for the task onto the stack of elements for the current thread, remembering the current time and the name of the task.
      Specified by:
        `taskStarted` in interface `BuildListener`
      Parameters:
        `event` - An event with any relevant extra information. Will not be `null`.
      See Also:
        `BuildEvent.getTask()`

    - #### taskFinished

          public void taskFinished(BuildEvent event)

      Fired when a task finishes building, this adds the time taken and any error stacktrace to the appropriate task element in the log.
      Specified by:
        `taskFinished` in interface `BuildListener`
      Parameters:
        `event` - An event with any relevant extra information. Will not be `null`.
      See Also:
        `BuildEvent.getException()`

    - #### messageLogged

          public void messageLogged(BuildEvent event)

      Fired when a message is logged, this adds a message element to the most appropriate parent element (task, target or build) and records the priority and text of the message.
      Specified by:
        `messageLogged` in interface `BuildListener`
      Parameters:
        `event` - An event with any relevant extra information. Will not be `null`.
      See Also:
        `BuildEvent.getMessage()`, `BuildEvent.getException()`, `BuildEvent.getPriority()`

    - #### setMessageOutputLevel

          public void setMessageOutputLevel(int level)

      Set the logging level when using this as a Logger
      Specified by:
        `setMessageOutputLevel` in interface `BuildLogger`
      Parameters:
        `level` - the logging level - see `Project` class for level definitions

    - #### setOutputPrintStream

          public void setOutputPrintStream(java.io.PrintStream output)

      Set the output stream to which logging output is sent when operating as a logger.
      Specified by:
        `setOutputPrintStream` in interface `BuildLogger`
      Parameters:
        `output` - the output PrintStream.

    - #### setEmacsMode

          public void setEmacsMode(boolean emacsMode)

      Ignore emacs mode, as it has no meaning in XML format
      Specified by:
        `setEmacsMode` in interface `BuildLogger`
      Parameters:
        `emacsMode` - true if logger should produce emacs compatible output

    - #### setErrorPrintStream

          public void setErrorPrintStream(java.io.PrintStream err)

      Ignore error print stream. All output will be written to either the XML log file or the PrintStream provided to setOutputPrintStream
      Specified by:
        `setErrorPrintStream` in interface `BuildLogger`
      Parameters:
        `err` - the stream we are going to ignore.