org.apache.tools.ant

## Class ProjectHelperRepository

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

-     public class ProjectHelperRepository
      extends java.lang.Object

  Repository of `ProjectHelper` found in the classpath or via some System properties.

  See the ProjectHelper documentation in the manual.

  Since:
    Ant 1.8.0

- - ### Method Summary

    All Methods Static Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `java.util.Iterator<ProjectHelper>` | `getHelpers()` Get an iterator on the list of project helpers configured.
    `static ProjectHelperRepository` | `getInstance()`
    `ProjectHelper` | `getProjectHelperForAntlib(Resource antlib)` Get the helper that will be able to parse the specified antlib.
    `ProjectHelper` | `getProjectHelperForBuildFile(Resource buildFile)` Get the helper that will be able to parse the specified build file.
    `void` | `registerProjectHelper(java.lang.Class<? extends ProjectHelper> helperClass)` Register the specified project helper into the repository.
    `void` | `registerProjectHelper(java.lang.String helperClassName)` Register the specified project helper into the repository.

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

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

- - ### Method Detail

    - #### getInstance

          public static ProjectHelperRepository getInstance()

    - #### registerProjectHelper

          public void registerProjectHelper(java.lang.String helperClassName)
                                     throws BuildException

      Register the specified project helper into the repository.

      The helper will be added after all the already registered helpers, but before the default one (ProjectHelper2)

      Parameters:
        `helperClassName` - the fully qualified name of the helper
      Throws:
        `BuildException` - if the class cannot be loaded or if there is no constructor with no argument
      Since:
        Ant 1.8.2

    - #### registerProjectHelper

          public void registerProjectHelper(java.lang.Class<? extends ProjectHelper> helperClass)
                                     throws BuildException

      Register the specified project helper into the repository.

      The helper will be added after all the already registered helpers, but before the default one (ProjectHelper2)

      Parameters:
        `helperClass` - the class of the helper
      Throws:
        `BuildException` - if there is no constructor with no argument
      Since:
        Ant 1.8.2

    - #### getProjectHelperForBuildFile

          public ProjectHelper getProjectHelperForBuildFile(Resource buildFile)
                                                     throws BuildException

      Get the helper that will be able to parse the specified build file. The helper will be chosen among the ones found in the classpath
      Parameters:
        `buildFile` - Resource
      Returns:
        the first ProjectHelper that fit the requirement (never `null`).
      Throws:
        `BuildException`

    - #### getProjectHelperForAntlib

          public ProjectHelper getProjectHelperForAntlib(Resource antlib)
                                                  throws BuildException

      Get the helper that will be able to parse the specified antlib. The helper will be chosen among the ones found in the classpath
      Parameters:
        `antlib` - Resource
      Returns:
        the first ProjectHelper that fit the requirement (never `null`).
      Throws:
        `BuildException`

    - #### getHelpers

          public java.util.Iterator<ProjectHelper> getHelpers()

      Get an iterator on the list of project helpers configured. The iterator will always return at least one element as there will always be the default project helper configured.
      Returns:
        an iterator of `ProjectHelper`