org.apache.openjpa.meta
Class AccessCode

java.lang.Object
  org.apache.openjpa.meta.AccessCode

public class AccessCode
extends Object

Represents access styles for members of a class and field through a 5-bit integer.
The bits designate following aspects of access style being used at class level:

Bit position 0 (UNKNOWN): generally 0. All bits as zero represent that no access style has been set. 1 denotes that the class has no property at all and its access can not be determined.

Bit position 1 (FIELD): Field based access is default

Bit position 2 (PROPERTY): Property based access is default

Bit position 3 (EXPLICIT): whether explicit or implicit Explicit access style allows members to use mixed access style, implicit access style does not

Bit position 4 (MIXED): whether all members are using the same access style or not. Can only be set if EXPLICT bit is set. If set, then bit 1 or 2 denotes what is the default.
The same bits designate following aspects of access style being used at field level:

Bit position 0 (UNKNOWN): always 0. All bits as zero represent that no access style has been set.

Bit position 1 (FIELD): Field based access is default

Bit position 2 (PROPERTY): Property based access is default

Bit position 3 (EXPLICIT): whether the access is explicit or implicit

Bit position 4 (MIXED): not used

Validation Rules for the bits:

1. Only one of the position 1 (FIELD) and 2 (PROPERTY) can be set. A single bit is not used for legacy reason to cope with the access constants used in ClassMetaData which this class now refactors to address new behaviors specified in JPA 2.0 specification.

2. if position 3 (EXPLICIT) is set then one of position 1 (FIELD) and 2 (PROPERTY) must be set.

3. If position 4 (MIXED) is set then the set position of either FIELD or PROPERTY designates the default access of the member.

Since:

2.0.0

Author:

Pinaki Poddar

Field Summary

static int	EMPTY
static int	EXPLICIT
static int	FIELD
static int	MIXED
static int	PROPERTY
static int	UNKNOWN

Constructor Summary

AccessCode()

Method Summary

static int	getMixedCode(int cCode, int fCode)
static boolean	isCompatibleSuper(int subCode, int superCode) Affirms if the sub class access type is compatible with super class access style.
static boolean	isEmpty(ClassMetaData meta)
static boolean	isEmpty(int code)
static boolean	isExplicit(int code)
static boolean	isField(ClassMetaData meta)
static boolean	isField(FieldMetaData meta)
static boolean	isField(int code)
static boolean	isMixed(int code) Affirms if the given code designates that members can use both FIELD and PROPERTY based access.
static boolean	isProperty(ClassMetaData meta)
static boolean	isProperty(FieldMetaData meta)
static boolean	isProperty(int code)
static boolean	isUnknown(ClassMetaData meta)
static boolean	isUnknown(FieldMetaData meta)
static boolean	isUnknown(int code)
static boolean	isValidClassCode(int code) Affirms if the given code is valid.
static boolean	isValidFieldCode(int code)
static int	mergeFieldCode(ClassMetaData meta, FieldMetaData fmd, int fCode)
static int	mergeFieldCode(int cCode, int fCode) Merges the field access type with the class access type provided such merge is valid.
static String	toClassString(int code)
static int	toFieldCode(int code)
static String	toFieldString(int code)

Methods inherited from class java.lang.Object

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

Field Detail

UNKNOWN

public static int UNKNOWN

EMPTY

public static int EMPTY

FIELD

public static int FIELD

PROPERTY

public static int PROPERTY

EXPLICIT

public static int EXPLICIT

MIXED

public static int MIXED

Constructor Detail

AccessCode

public AccessCode()

Method Detail

isValidClassCode

public static boolean isValidClassCode(int code)

Affirms if the given code is valid.

isValidFieldCode

public static boolean isValidFieldCode(int code)

isMixed

public static boolean isMixed(int code)

Affirms if the given code designates that members can use both FIELD and PROPERTY based access.

isExplicit

public static boolean isExplicit(int code)

isProperty

public static boolean isProperty(int code)

isField

public static boolean isField(int code)

isUnknown

public static boolean isUnknown(int code)

isEmpty

public static boolean isEmpty(int code)

isField

public static boolean isField(ClassMetaData meta)

isProperty

public static boolean isProperty(ClassMetaData meta)

isUnknown

public static boolean isUnknown(ClassMetaData meta)

isEmpty

public static boolean isEmpty(ClassMetaData meta)

isField

public static boolean isField(FieldMetaData meta)

isProperty

public static boolean isProperty(FieldMetaData meta)

isUnknown

public static boolean isUnknown(FieldMetaData meta)

isCompatibleSuper

public static boolean isCompatibleSuper(int subCode,
                                        int superCode)

Affirms if the sub class access type is compatible with super class access style.

mergeFieldCode

public static int mergeFieldCode(ClassMetaData meta,
                                 FieldMetaData fmd,
                                 int fCode)

mergeFieldCode

public static int mergeFieldCode(int cCode,
                                 int fCode)

Merges the field access type with the class access type provided such merge is valid.

Returns:

the modified class access code.

Throws:

if - the given codes are not compatible

getMixedCode

public static int getMixedCode(int cCode,
                               int fCode)

toFieldCode

public static int toFieldCode(int code)

toFieldString

public static String toFieldString(int code)

toClassString

public static String toClassString(int code)