groovy.lang
Class ProxyMetaClass

java.lang.Object
  groovy.lang.MetaClassImpl
      groovy.lang.ProxyMetaClass

All Implemented Interfaces:

AdaptingMetaClass

class ProxyMetaClass
extends MetaClassImpl

As subclass of MetaClass, ProxyMetaClass manages calls from Groovy Objects to POJOs. It enriches MetaClass with the feature of making method invokations interceptable by an Interceptor. To this end, it acts as a decorator (decorator pattern) allowing to add or withdraw this feature at runtime. See groovy/lang/InterceptorTest.groovy for details.

WARNING: This implementation of ProxyMetaClass is NOT threadsafe and hence should only be used for as a per-instance MetaClass running in a single thread. Do not place this MetaClass in the MetaClassRegistry as it will result in unpredictable behaviour

author:

Dierk Koenig

author:

Graeme Rocher

see:

MetaClassRegistry

adaptee

protected MetaClass adaptee

interceptor

protected Interceptor interceptor

ProxyMetaClass

public ProxyMetaClass(MetaClassRegistry registry, Class theClass, MetaClass adaptee)

param:

adaptee the MetaClass to decorate with interceptability

getAdaptee

public MetaClass getAdaptee()

getInstance

public static ProxyMetaClass getInstance(Class theClass)

convenience factory method for the most usual case.

getInterceptor

public Interceptor getInterceptor()

return:

the interceptor in use or null if no interceptor is used

getProperty

public Object getProperty(Class aClass, Object object, String property, boolean b, boolean b1)

Interceptors the call to getProperty if a PropertyAccessInterceptor is available

param:

object the object to invoke the getter on

param:

property the property name

return:

the value of the property

initialize

public void initialize()

invokeConstructor

public Object invokeConstructor(Object[] arguments)

Call invokeConstructor on adaptee with logic like in MetaClass unless we have an Interceptor. With Interceptor the call is nested in its beforeInvoke and afterInvoke methods. The method call is suppressed if Interceptor.doInvoke() returns false. See Interceptor for details.

invokeMethod

public Object invokeMethod(Object object, String methodName, Object[] arguments)

Call invokeMethod on adaptee with logic like in MetaClass unless we have an Interceptor. With Interceptor the call is nested in its beforeInvoke and afterInvoke methods. The method call is suppressed if Interceptor.doInvoke() returns false. See Interceptor for details.

invokeStaticMethod

public Object invokeStaticMethod(Object object, String methodName, Object[] arguments)

Call invokeStaticMethod on adaptee with logic like in MetaClass unless we have an Interceptor. With Interceptor the call is nested in its beforeInvoke and afterInvoke methods. The method call is suppressed if Interceptor.doInvoke() returns false. See Interceptor for details.

setAdaptee

public void setAdaptee(MetaClass metaClass)

setInterceptor

public void setInterceptor(Interceptor interceptor)

param:

interceptor may be null to reset any interception

setProperty

public void setProperty(Class aClass, Object object, String property, Object newValue, boolean b, boolean b1)

Interceptors the call to a property setter if a PropertyAccessInterceptor is available

param:

object The object to invoke the setter on

param:

property The property name to set

param:

newValue The new value of the property

use

public Object use(Closure closure)

Use the ProxyMetaClass for the given Closure. Cares for balanced register/unregister.

param:

closure piece of code to be executed with registered ProxyMetaClass

use

public Object use(GroovyObject object, Closure closure)

Use the ProxyMetaClass for the given Closure. Cares for balanced setting/unsetting ProxyMetaClass.

param:

closure piece of code to be executed with ProxyMetaClass

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