org.springframework.scripting.bsh

Class BshScriptFactory

java.lang.Object

org.springframework.scripting.bsh.BshScriptFactory

All Implemented Interfaces:

Aware, BeanClassLoaderAware, ScriptFactory

public class BshScriptFactory
extends java.lang.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

Field Summary

Fields

Modifier and Type	Field and Description
private java.lang.ClassLoader	beanClassLoader
private java.lang.Class<?>	scriptClass
private java.lang.Object	scriptClassMonitor
private java.lang.Class<?>[]	scriptInterfaces
private java.lang.String	scriptSourceLocator
private boolean	wasModifiedForTypeCheck

Constructor Summary

Constructors

Constructor and Description
BshScriptFactory(java.lang.String scriptSourceLocator) Create a new BshScriptFactory for the given script source.
BshScriptFactory(java.lang.String scriptSourceLocator, java.lang.Class<?>... scriptInterfaces) Create a new BshScriptFactory for the given script source.

Method Summary

Modifier and Type	Method and Description
java.lang.Object	getScriptedObject(ScriptSource scriptSource, java.lang.Class<?>... actualInterfaces) Load and parse the BeanShell script via BshScriptUtils.
java.lang.Class<?>	getScriptedObjectType(ScriptSource scriptSource) Determine the type of the scripted Java object.
java.lang.Class<?>[]	getScriptInterfaces() Return the business interfaces that the script is supposed to implement.
java.lang.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(java.lang.ClassLoader classLoader) Callback that supplies the bean class loader to a bean instance.
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Field Detail

scriptSourceLocator

private final java.lang.String scriptSourceLocator

scriptInterfaces

private final java.lang.Class<?>[] scriptInterfaces

beanClassLoader

private java.lang.ClassLoader beanClassLoader

scriptClass

private java.lang.Class<?> scriptClass

scriptClassMonitor

private final java.lang.Object scriptClassMonitor

wasModifiedForTypeCheck

private boolean wasModifiedForTypeCheck

Constructor Detail

BshScriptFactory

public BshScriptFactory(java.lang.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(java.lang.String scriptSourceLocator,
                        java.lang.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(java.lang.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 java.lang.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 java.lang.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 java.lang.Object getScriptedObject(ScriptSource scriptSource,
                                          java.lang.Class<?>... actualInterfaces)
                                   throws java.io.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:

java.io.IOException - if script retrieval failed

ScriptCompilationException - if script compilation failed

See Also:

BshScriptUtils.createBshObject(String, Class[], ClassLoader)

getScriptedObjectType

public java.lang.Class<?> getScriptedObjectType(ScriptSource scriptSource)
                                         throws java.io.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:

java.io.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 java.lang.String toString()

Overrides:

toString in class java.lang.Object