org.apache.jdo.impl.model.java.reflection
Class ReflectionJavaModelFactory

java.lang.Object
  org.apache.jdo.impl.model.java.AbstractJavaModelFactory
      org.apache.jdo.impl.model.java.reflection.ReflectionJavaModelFactory

All Implemented Interfaces:

JavaModelFactory

public abstract class ReflectionJavaModelFactory

extends AbstractJavaModelFactory

A reflection based JavaModelFactory implementation. The implementation takes java.lang.Class and java.lang.reflect.Field instances to get Java related metadata about types and fields. This implementation caches JavaModel instances per ClassLoader.

Since:

JDO 2.0

Author:

Michael Bouschen

Constructor Summary

ReflectionJavaModelFactory()

Method Summary

JavaModel	createJavaModel(java.lang.Object key) Creates a new empty JavaModel instance.
java.lang.ClassLoader	getClassLoaderPrivileged(java.lang.Class clazz) Calls getClassLoader on the specified class instance in a doPrivileged block.
java.lang.Class	getJavaClass(JavaType javaType) Returns the java.lang.Class wrapped in the specified JavaType.
JavaModel	getJavaModel(java.lang.Object key) Returns the JavaModel instance for the specified key.
JavaType	getJavaType(java.lang.Object typeDesc) Returns a JavaType instance for the specified type description (optional operation).
protected JavaModel	newJavaModelInstance(java.lang.ClassLoader classLoader) Creates a new instance of the JavaModel implementation class.

Methods inherited from class org.apache.jdo.impl.model.java.AbstractJavaModelFactory

removeJavaModel, removeJavaModel

Methods inherited from class java.lang.Object

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

Constructor Detail

ReflectionJavaModelFactory

public ReflectionJavaModelFactory()

Method Detail

createJavaModel

public JavaModel createJavaModel(java.lang.Object key)
                          throws ModelException

Creates a new empty JavaModel instance. A factory implementation may use the specified key when caching the new JavaModel instance.

This implementation only accepts java.lang.ClassLoader instances as key and does not support null keys. A ModelException indicates an invalid key.

The method automatically sets the parent/child relationship for the created JavaModel according to the parent/child relationship of the ClassLoader passed as key.

Specified by:

createJavaModel in interface JavaModelFactory

Specified by:

createJavaModel in class AbstractJavaModelFactory

Parameters:

key - the key that may be used to cache the returned JavaModel instance.

Returns:

a new JavaModel instance.

Throws:

ModelException - if impossible; the key is of an inappropriate type or the key is null and this JavaModelFactory does not support null keys.

getJavaModel

public JavaModel getJavaModel(java.lang.Object key)

Returns the JavaModel instance for the specified key.

Specified by:

getJavaModel in interface JavaModelFactory

Overrides:

getJavaModel in class AbstractJavaModelFactory

Parameters:

key - the key used to cache the returned JavaModel instance

Returns:

a JavaModel instance for the specified key.

getJavaType

public JavaType getJavaType(java.lang.Object typeDesc)

Returns a JavaType instance for the specified type description (optional operation). This method is a convenience method and a short cut for getJavaModel(key).getJavaType(typeName).

The ReflectionJavaModelFactory supports this short cut and accepts java.lang.Class instances as valid arguments for this method. The method throws a ModelFatalException, if the specified type descriptor is not a java.lang.Class instance.

Specified by:

getJavaType in interface JavaModelFactory

Overrides:

getJavaType in class AbstractJavaModelFactory

Parameters:

typeDesc - the type description

Returns:

a JavaType instance for the specified type.

Throws:

ModelFatalException - the specified type description is not a java.lang.Class instance.

getClassLoaderPrivileged

public java.lang.ClassLoader getClassLoaderPrivileged(java.lang.Class clazz)

Calls getClassLoader on the specified class instance in a doPrivileged block. Any SecurityException is wrapped into a ModelFatalException.

Returns:

the class loader that loaded the specified class instance.

Throws:

ModelFatalException - wraps the SecurityException thrown by getClassLoader.

getJavaClass

public java.lang.Class getJavaClass(JavaType javaType)

Returns the java.lang.Class wrapped in the specified JavaType.

Returns:

the java.lang.Class for the specified JavaType.

Throws:

ModelFatalException - the specified JavaType does not wrap a java.lang.Class instance.

newJavaModelInstance

protected JavaModel newJavaModelInstance(java.lang.ClassLoader classLoader)

Creates a new instance of the JavaModel implementation class.

This implementation returns a ReflectionJavaModel instance.

Returns:

a new JavaModel instance.