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

java.lang.Object
  org.apache.jdo.impl.model.java.AbstractJavaField
      org.apache.jdo.impl.model.java.BaseReflectionJavaField
          org.apache.jdo.impl.model.java.reflection.ReflectionJavaField

All Implemented Interfaces:

JavaField

public class ReflectionJavaField
extends BaseReflectionJavaField

A reflection based JavaField implementation used at runtime. The implementation takes java.lang.reflect.Field instances to get Java related metadata about fields.

Since:

JDO 1.1

Author:

Michael Bouschen

Field Summary

protected JDOField

jdoField The corresponding JDO metadata.

Fields inherited from class org.apache.jdo.impl.model.java.BaseReflectionJavaField

type

Constructor Summary

ReflectionJavaField(java.lang.reflect.Field field, JavaType declaringClass)
Constructor for fields w/o JDO metadata.

ReflectionJavaField(JDOField jdoField, JavaType declaringClass)
Constructor for fields having JDO metadata.

ReflectionJavaField(JDOField jdoField, JavaType type, JavaType declaringClass)
Constructor for fields having JDO metadata.

Method Summary

protected JavaType	getJavaTypeInternal(java.lang.Class clazz) Returns a JavaType instance for the specified Class object.
JDOField	getJDOField() Returns the JDOField instance if this JavaField represents a managed field of a persistence capable class.
JavaType	getType() Returns the JavaType representation of the field type.

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

ensureInitializedField, getDeclaredFieldPrivileged, getField, getModifiers

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

equals, getDeclaringClass, getName, hashCode, toString

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

jdoField

protected JDOField jdoField

The corresponding JDO metadata.

Constructor Detail

ReflectionJavaField

public ReflectionJavaField(java.lang.reflect.Field field,
                           JavaType declaringClass)

Constructor for fields w/o JDO metadata.

Parameters:

field - the reflection field representation.

declaringClass - the JavaType of the class that declares the field.

ReflectionJavaField

public ReflectionJavaField(JDOField jdoField,
                           JavaType declaringClass)

Constructor for fields having JDO metadata. The constructor takes the field type from the JDO metadata.

Parameters:

jdoField - the JDO field metadata.

declaringClass - the JavaType of the class that declares the field.

ReflectionJavaField

public ReflectionJavaField(JDOField jdoField,
                           JavaType type,
                           JavaType declaringClass)

Constructor for fields having JDO metadata.

Parameters:

jdoField - the JDO field metadata.

type - the field type.

declaringClass - the JavaType of the class that declares the field.

Method Detail

getType

public JavaType getType()

Returns the JavaType representation of the field type.

Specified by:

getType in interface JavaField

Overrides:

getType in class BaseReflectionJavaField

Returns:

field type

getJDOField

public JDOField getJDOField()

Returns the JDOField instance if this JavaField represents a managed field of a persistence capable class. The method returns null, if this JavaField does not represent a managed field.

The method throws a ModelFatalException, if there is a problem accessing the JDO meta data for this JavaField.

Specified by:

getJDOField in interface JavaField

Overrides:

getJDOField in class AbstractJavaField

Returns:

the JDOField instance if this JavaField represents a managed field; null otherwise.

getJavaTypeInternal

protected JavaType getJavaTypeInternal(java.lang.Class clazz)

Returns a JavaType instance for the specified Class object. This method provides a hook such that ReflectionJavaField subclasses can implement their own mapping of Class objects to JavaType instances.