TaskConfigurationChecker (Apache Ant API)
Date: 2012-02-26

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## org.apache.tools.ant
Class TaskConfigurationChecker

    java.lang.Object
      org.apache.tools.ant.TaskConfigurationChecker

    public class TaskConfigurationChecker

extends java.lang.Object

Helper class for the check of the configuration of a given task. This class provides methods for making assumptions about the task configuration. After collecting all violations with `assert*` and `fail` methods the `checkErrors` will throw a BuildException with all collected messages or does nothing if there wasn't any error.

Example:

         public class MyTask extends Task {
             ...
             public void execute() {
                 TaskConfigurationChecker checker = TaskConfigurationChecker(this);
                 checker.assertConfig(
                     srcdir != null,
                     "Attribute 'srcdir' must be set.
                 );
                 checker.assertConfig(
                     srcdir.exists(),
                     "Srcdir (" + srcdir + ") must exist."
                 );
                 if (someComplexCondition()) {
                     fail("Complex condition failed.");
                 }
                 checker.checkErrors();
             }
         }

See Also:
  Notification Pattern

Constructor Summary
`TaskConfigurationChecker(Task task)` Constructor.

Method Summary
`void` | `assertConfig(boolean condition, java.lang.String errormessage)` Asserts that a condition is true.
`void` | `checkErrors()` Checks if there are any collected errors and throws a BuildException with all messages if there was one or more.
`void` | `fail(java.lang.String errormessage)` Registers an error.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### TaskConfigurationChecker

    public TaskConfigurationChecker(Task task)

  Constructor.

  Parameters:
    `task` - which task should be checked

Method Detail

### assertConfig

    public void assertConfig(boolean condition,
                             java.lang.String errormessage)

  Asserts that a condition is true.

  Parameters:
    `condition` - which condition to check
    `errormessage` - errormessage to throw if a condition failed

### fail

    public void fail(java.lang.String errormessage)

  Registers an error.

  Parameters:
    `errormessage` - the message for the registered error

### checkErrors

    public void checkErrors()
                     throws BuildException

  Checks if there are any collected errors and throws a BuildException with all messages if there was one or more.

  Throws:
    `BuildException` - if one or more errors were registered

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