org.openjdk.jol.info

Class ClassLayout

java.lang.Object

org.openjdk.jol.info.ClassLayout

public class ClassLayout
extends Object

Handles the class data *with* the layout information.

Constructor Summary

Constructors

Constructor and Description
ClassLayout(ClassData classData, SortedSet<FieldLayout> fields, int headerSize, int instanceSize, boolean check) Builds the class layout.

Method Summary

Methods

Modifier and Type	Method and Description
SortedSet<FieldLayout>	fields() Answer the set of fields, including those in superclasses
int	headerSize() Answer header size
int	instanceSize() Answer instance size
static ClassLayout	parseClass(Class<?> klass) Produce the class layout for the given class.
static ClassLayout	parseClass(Class<?> klass, Layouter layouter) Produce the class layout for the given class, and given layouter.
String	toPrintable() Produce printable stringly representation of class layout.
String	toPrintable(Object instance) Produce printable stringly representation of class layout.
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

ClassLayout

public ClassLayout(ClassData classData,
           SortedSet<FieldLayout> fields,
           int headerSize,
           int instanceSize,
           boolean check)

Builds the class layout.

Parameters:

classData - class data

fields - field layouts

headerSize - header size

instanceSize - instance size

check - whether to check important invariants

Method Detail

parseClass

public static ClassLayout parseClass(Class<?> klass)

Produce the class layout for the given class. This produces the layout for the current VM.

Parameters:

klass - class to work on

Returns:

class layout

parseClass

public static ClassLayout parseClass(Class<?> klass,
                     Layouter layouter)

Produce the class layout for the given class, and given layouter.

Parameters:

klass - class to work on

layouter - class layouter

Returns:

class layout

fields

public SortedSet<FieldLayout> fields()

Answer the set of fields, including those in superclasses

Returns:

sorted set of fields

instanceSize

public int instanceSize()

Answer instance size

Returns:

instance size

headerSize

public int headerSize()

Answer header size

Returns:

header size

toString

public String toString()

Overrides:

toString in class Object

toPrintable

public String toPrintable()

Produce printable stringly representation of class layout. This method does not require alive instance, just the class.

Returns:

human-readable layout info

toPrintable

public String toPrintable(Object instance)

Produce printable stringly representation of class layout. This method accepts instance to read the actual data from.

Parameters:

instance - instance to work on

Returns:

human-readable layout info