Package org.aspectj.org.eclipse.jdt.internal.core.nd.field

Class Field<T>

java.lang.Object

org.aspectj.org.eclipse.jdt.internal.core.nd.field.Field<T>

Type Parameters:

T -

All Implemented Interfaces:

IDestructableField, IField

public final class Field<T>
extends Object
implements IDestructableField

Used to represent a single field of an object stored in the database. Objects which store themselves in the database should store a set of static final FieldDefinitions at the top of their class definition to indicate their memory map. This serves as a standard way to document the memory map for such structs, provides access to the field offsets, and provides a convenience getter.

There are two ways to use this. Callers can either use the "get" method to access the value of the field, or can use the public "offset" attribute to perform the reads manually. The get function is more convenient but allocates objects and so should probably not be used for frequently-accessed fields or primitive types that would end up being autoboxed unnecessarily.

Field Summary

Fields

Modifier and Type	Field	Description
ITypeFactory<T>	factory
protected int	offset

Constructor Summary

Constructors

Constructor	Description
Field(ITypeFactory<T> objectFactory, String structName, int fieldNumber)

Method Summary

Modifier and Type	Method	Description
static <T> Field<T>	create(StructDef<?> struct, StructDef<T> fieldType)	Creates a new Field in the given struct with the given type.
void	destruct(Nd nd, long address)
T	get(Nd nd, long address)
int	getAlignment()	Returns the required byte alignment for the field.
String	getFieldName()	Returns the name of the field.
int	getOffset()	Returns the field offset, in bytes from the start of the struct.
int	getRecordSize()	Returns the size of the field, in bytes.
boolean	hasDestructor()
protected void	setFieldName(String fieldName)
void	setOffset(int offset)	Sets the field offset (bytes from the start of the struct).

Methods inherited from class java.lang.Object

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

Field Details

factory

public final ITypeFactory<T> factory

offset

protected int offset

Constructor Details

Field

public Field(ITypeFactory<T> objectFactory,
 String structName,
 int fieldNumber)

Method Details

get

public T get(Nd nd,
 long address)

hasDestructor

public boolean hasDestructor()

destruct

public void destruct(Nd nd,
 long address)

Specified by:

destruct in interface IDestructableField

getRecordSize

public int getRecordSize()

Description copied from interface: IField

Returns the size of the field, in bytes.

Specified by:

getRecordSize in interface IField

getAlignment

public int getAlignment()

Description copied from interface: IField

Returns the required byte alignment for the field.

Specified by:

getAlignment in interface IField

create

public static <T> Field<T> create(StructDef<?> struct,
 StructDef<T> fieldType)

Creates a new Field in the given struct with the given type.

Parameters:

struct - the struct that will contain the newly-created field (must not have had StructDef.done() called on it yet).

fieldType - the data type for the contents of the newly created field

Returns:

the newly-constructed field

setFieldName

protected final void setFieldName(String fieldName)

setOffset

public final void setOffset(int offset)

Description copied from interface: IField

Sets the field offset (bytes from the start of the struct). This is invoked some time after field construction, after the sizes of all preceeding fields are known.

Specified by:

setOffset in interface IField

getOffset

public final int getOffset()

Description copied from interface: IField

Returns the field offset, in bytes from the start of the struct.

Specified by:

getOffset in interface IField

getFieldName

public final String getFieldName()

Description copied from interface: IField

Returns the name of the field. This is mainly used for error messages, debug output, and diagnostic tools. Meant to be programmer-readable but not user-readable.

Specified by:

getFieldName in interface IField