org.springframework.scripting.bsh

## Class BshScriptFactory

- java.lang.Object
- - org.springframework.scripting.bsh.BshScriptFactory

- All Implemented Interfaces:
    Aware, BeanClassLoaderAware, ScriptFactory

      public class BshScriptFactory
      extends Object
      implements ScriptFactory, BeanClassLoaderAware

  `ScriptFactory` implementation for a BeanShell script.

  Typically used in combination with a `ScriptFactoryPostProcessor`; see the latter's javadoc for a configuration example.

  Since:
    2.0
  Author:
    Juergen Hoeller, Rob Harrop
  See Also:
    `BshScriptUtils`, `ScriptFactoryPostProcessor`

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `BshScriptFactory(String scriptSourceLocator)` Create a new BshScriptFactory for the given script source.
    `BshScriptFactory(String scriptSourceLocator, Class[] scriptInterfaces)` Create a new BshScriptFactory for the given script source.

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `Object` | `getScriptedObject(ScriptSource scriptSource, Class[] actualInterfaces)` Load and parse the BeanShell script via `BshScriptUtils`.
    `Class` | `getScriptedObjectType(ScriptSource scriptSource)` Determine the type of the scripted Java object.
    `Class[]` | `getScriptInterfaces()` Return the business interfaces that the script is supposed to implement.
    `String` | `getScriptSourceLocator()` Return a locator that points to the source of the script.
    `boolean` | `requiresConfigInterface()` BeanShell scripts do require a config interface.
    `boolean` | `requiresScriptedObjectRefresh(ScriptSource scriptSource)` Determine whether a refresh is required (e.g.
    `void` | `setBeanClassLoader(ClassLoader classLoader)` Callback that supplies the bean `class loader` to a bean instance.
    `String` | `toString()`

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

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

- - ### Constructor Detail

    - #### BshScriptFactory

          public BshScriptFactory(String scriptSourceLocator)

      Create a new BshScriptFactory for the given script source.

      With this `BshScriptFactory` variant, the script needs to declare a full class or return an actual instance of the scripted object.

      Parameters:
        `scriptSourceLocator` - a locator that points to the source of the script. Interpreted by the post-processor that actually creates the script.

    - #### BshScriptFactory

          public BshScriptFactory(String scriptSourceLocator,
                          Class[] scriptInterfaces)

      Create a new BshScriptFactory for the given script source.

      The script may either be a simple script that needs a corresponding proxy generated (implementing the specified interfaces), or declare a full class or return an actual instance of the scripted object (in which case the specified interfaces, if any, need to be implemented by that class/instance).

      Parameters:
        `scriptSourceLocator` - a locator that points to the source of the script. Interpreted by the post-processor that actually creates the script.
        `scriptInterfaces` - the Java interfaces that the scripted object is supposed to implement (may be `null`)

  - ### Method Detail

    - #### setBeanClassLoader

          public void setBeanClassLoader(ClassLoader classLoader)

      Description copied from interface: `BeanClassLoaderAware`
      Callback that supplies the bean `class loader` to a bean instance.

      Invoked after the population of normal bean properties but before an initialization callback such as `InitializingBean's` `InitializingBean.afterPropertiesSet()` method or a custom init-method.

      Specified by:
        `setBeanClassLoader` in interface `BeanClassLoaderAware`
      Parameters:
        `classLoader` - the owning class loader; may be `null` in which case a default `ClassLoader` must be used, for example the `ClassLoader` obtained via `ClassUtils.getDefaultClassLoader()`

    - #### getScriptSourceLocator

          public String getScriptSourceLocator()

      Description copied from interface: `ScriptFactory`
      Return a locator that points to the source of the script. Interpreted by the post-processor that actually creates the script.

      Typical supported locators are Spring resource locations (such as "file:C:/myScript.bsh" or "classpath:myPackage/myScript.bsh") and inline scripts ("inline:myScriptText...").

      Specified by:
        `getScriptSourceLocator` in interface `ScriptFactory`
      Returns:
        the script source locator
      See Also:
        `ScriptFactoryPostProcessor.convertToScriptSource(java.lang.String, java.lang.String, org.springframework.core.io.ResourceLoader)`, `ResourceLoader`

    - #### getScriptInterfaces

          public Class[] getScriptInterfaces()

      Description copied from interface: `ScriptFactory`
      Return the business interfaces that the script is supposed to implement.

      Can return `null` if the script itself determines its Java interfaces (such as in the case of Groovy).

      Specified by:
        `getScriptInterfaces` in interface `ScriptFactory`
      Returns:
        the interfaces for the script

    - #### requiresConfigInterface

          public boolean requiresConfigInterface()

      BeanShell scripts do require a config interface.
      Specified by:
        `requiresConfigInterface` in interface `ScriptFactory`
      Returns:
        whether the script requires a generated config interface
      See Also:
        `ScriptFactory.getScriptInterfaces()`

    - #### getScriptedObject

          public Object getScriptedObject(ScriptSource scriptSource,
                                 Class[] actualInterfaces)
                                   throws IOException,
                                          ScriptCompilationException

      Load and parse the BeanShell script via `BshScriptUtils`.
      Specified by:
        `getScriptedObject` in interface `ScriptFactory`
      Parameters:
        `scriptSource` - the actual ScriptSource to retrieve the script source text from (never `null`)
        `actualInterfaces` - the actual interfaces to expose, including script interfaces as well as a generated config interface (if applicable; may be `null`)
      Returns:
        the scripted Java object
      Throws:
        `IOException` - if script retrieval failed
        `ScriptCompilationException` - if script compilation failed
      See Also:
        `BshScriptUtils.createBshObject(String, Class[], ClassLoader)`

    - #### getScriptedObjectType

          public Class getScriptedObjectType(ScriptSource scriptSource)
                                      throws IOException,
                                             ScriptCompilationException

      Description copied from interface: `ScriptFactory`
      Determine the type of the scripted Java object.

      Implementations are encouraged to cache script metadata such as a generated script class. Note that this method may be invoked concurrently and must be implemented in a thread-safe fashion.

      Specified by:
        `getScriptedObjectType` in interface `ScriptFactory`
      Parameters:
        `scriptSource` - the actual ScriptSource to retrieve the script source text from (never `null`)
      Returns:
        the type of the scripted Java object, or `null` if none could be determined
      Throws:
        `IOException` - if script retrieval failed
        `ScriptCompilationException` - if script compilation failed

    - #### requiresScriptedObjectRefresh

          public boolean requiresScriptedObjectRefresh(ScriptSource scriptSource)

      Description copied from interface: `ScriptFactory`
      Determine whether a refresh is required (e.g. through ScriptSource's `isModified()` method).
      Specified by:
        `requiresScriptedObjectRefresh` in interface `ScriptFactory`
      Parameters:
        `scriptSource` - the actual ScriptSource to retrieve the script source text from (never `null`)
      Returns:
        whether a fresh `ScriptFactory.getScriptedObject(org.springframework.scripting.ScriptSource, java.lang.Class[])` call is required
      See Also:
        `ScriptSource.isModified()`

    - #### toString

          public String toString()

      Overrides:
        `toString` in class `Object`