ClasspathUtils.Delegate (Apache Ant API)
Keywords: org.apache.tools.ant.util.ClasspathUtils.Delegate,ClasspathUtils.Delegate class

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## org.apache.tools.ant.util
Class ClasspathUtils.Delegate

    java.lang.Object
      |
      +--org.apache.tools.ant.util.ClasspathUtils.Delegate

Enclosing class:
  ClasspathUtils

public static class ClasspathUtils.Delegate
extends java.lang.Object

Delegate that helps out any specific ProjectComponent that needs dynamic classloading.

Ant ProjectComponents that need a to be able to dynamically load Classes and instantiate them often expose the following ant syntax sugar:

- nested <classpath>
- attribute @classpathref
- attribute @classname

This class functions as a delegate handling the configuration issues for this recuring pattern. Its usage pattern, as the name suggests is delegation, not inheritance.

Since:
  Ant 1.6

Method Summary
`Path` | `createClasspath()` Delegate method handling the <classpath> tag.
`java.lang.ClassLoader` | `getClassLoader()` Finds or creates the classloader for this object.
`java.lang.String` | `getClassLoadId()` Computes the loaderId based on the configuration of the component.
`Path` | `getClasspath()` The classpath.
`boolean` | `isReverseLoader()` Get the reverseLoader setting.
`java.lang.Object` | `newInstance()` Helper method obtaining a fresh instance of the class specified in the @classname and using the specified classpath.
`void` | `setClassname(java.lang.String fcqn)` Delegate method handling the @classname attribute.
`void` | `setClasspath(Path classpath)` This method is a Delegate method handling the @classpath attribute.
`void` | `setClasspathref(Reference r)` Delegate method handling the @classpathref attribute.
`void` | `setLoaderRef(Reference r)` Sets the loaderRef.
`void` | `setReverseLoader(boolean reverseLoader)` Delegate method handling the @reverseLoader attribute.

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

Method Detail

### setClasspath

    public void setClasspath(Path classpath)

  This method is a Delegate method handling the @classpath attribute.

  This attribute can set a path to add to the classpath.

  Parameters:
    `classpath` - the path to use for the classpath.

### createClasspath

    public Path createClasspath()

  Delegate method handling the <classpath> tag.

  This nested path-like structure can set a path to add to the classpath.

  Returns:
    the created path.

### setClassname

    public void setClassname(java.lang.String fcqn)

  Delegate method handling the @classname attribute.

  This attribute sets the full qualified class name of the class to load and instantiate.

  Parameters:
    `fcqn` - the name of the class to load.

### setClasspathref

    public void setClasspathref(Reference r)

  Delegate method handling the @classpathref attribute.

  This attribute can add a referenced path-like structure to the classpath.

  Parameters:
    `r` - the reference to the classpath.

### setReverseLoader

    public void setReverseLoader(boolean reverseLoader)

  Delegate method handling the @reverseLoader attribute.

  This attribute can set a boolean indicating that the used classloader should NOT follow the classical parent-first scheme.

  By default this is supposed to be false.

  Caution: this behaviour is contradictory to the normal way classloaders work. Do not let your ProjectComponent use it if you are not really sure.

  Parameters:
    `reverseLoader` - if true reverse the order of looking up a class.

### setLoaderRef

    public void setLoaderRef(Reference r)

  Sets the loaderRef.

  Parameters:
    `r` - the reference to the loader.

### getClassLoader

    public java.lang.ClassLoader getClassLoader()

  Finds or creates the classloader for this object.

  Returns:
    The class loader.

### getClassLoadId

    public java.lang.String getClassLoadId()

  Computes the loaderId based on the configuration of the component.

  Returns:
    a loader identifier.

### newInstance

    public java.lang.Object newInstance()

  Helper method obtaining a fresh instance of the class specified in the @classname and using the specified classpath.

  Returns:
    the fresh instantiated object.

### getClasspath

    public Path getClasspath()

  The classpath.

  Returns:
    the classpath.

### isReverseLoader

    public boolean isReverseLoader()

  Get the reverseLoader setting.

  Returns:
    true if looking up in reverse order.

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