java.io
Class ObjectInputStream.GetFieldImpl

java.lang.Object
  java.io.ObjectInputStream.GetField
      java.io.ObjectInputStream.GetFieldImpl

Enclosing class:

ObjectInputStream

private class ObjectInputStream.GetFieldImpl

extends ObjectInputStream.GetField

Default GetField implementation.

Field Summary

private ObjectStreamClass	desc class descriptor describing serializable fields
private int[]	objHandles object field value handles
private Object[]	objVals object field values
private byte[]	primVals primitive field values

Constructor Summary

(package private)

ObjectInputStream.GetFieldImpl(ObjectStreamClass desc) Creates GetFieldImpl object for reading fields defined in given class descriptor.

Method Summary

boolean	defaulted(String name) Return true if the named field is defaulted and has no value in this stream.
boolean	get(String name, boolean val) Get the value of the named boolean field from the persistent field.
byte	get(String name, byte val) Get the value of the named byte field from the persistent field.
char	get(String name, char val) Get the value of the named char field from the persistent field.
double	get(String name, double val) Get the value of the named double field from the persistent field.
float	get(String name, float val) Get the value of the named float field from the persistent field.
int	get(String name, int val) Get the value of the named int field from the persistent field.
long	get(String name, long val) Get the value of the named long field from the persistent field.
Object	get(String name, Object val) Get the value of the named Object field from the persistent field.
short	get(String name, short val) Get the value of the named short field from the persistent field.
private int	getFieldOffset(String name, Class type) Returns offset of field with given name and type.
ObjectStreamClass	getObjectStreamClass() Get the ObjectStreamClass that describes the fields in the stream.
(package private) void	readFields() Reads primitive and object field values from stream.

Methods inherited from class java.lang.Object

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

Field Detail

desc

private final ObjectStreamClass desc

class descriptor describing serializable fields

primVals

private final byte[] primVals

primitive field values

objVals

private final Object[] objVals

object field values

objHandles

private final int[] objHandles

object field value handles

Constructor Detail

ObjectInputStream.GetFieldImpl

ObjectInputStream.GetFieldImpl(ObjectStreamClass desc)

Creates GetFieldImpl object for reading fields defined in given class descriptor.

Method Detail

getObjectStreamClass

public ObjectStreamClass getObjectStreamClass()

Description copied from class: ObjectInputStream.GetField

Get the ObjectStreamClass that describes the fields in the stream.

Specified by:

getObjectStreamClass in class ObjectInputStream.GetField

Returns:

the descriptor class that describes the serializable fields

defaulted

public boolean defaulted(String name)
                  throws IOException

Description copied from class: ObjectInputStream.GetField

Return true if the named field is defaulted and has no value in this stream.

Specified by:

defaulted in class ObjectInputStream.GetField

Parameters:

name - the name of the field

Returns:

true, if and only if the named field is defaulted

Throws:

IOException - if there are I/O errors while reading from the underlying InputStream

get

public boolean get(String name,
                   boolean val)
            throws IOException

Description copied from class: ObjectInputStream.GetField

Get the value of the named boolean field from the persistent field.

Specified by:

get in class ObjectInputStream.GetField

Parameters:

name - the name of the field

val - the default value to use if name does not have a value

Returns:

the value of the named boolean field

Throws:

IOException - if there are I/O errors while reading from the underlying InputStream

get

public byte get(String name,
                byte val)
         throws IOException

Description copied from class: ObjectInputStream.GetField

Get the value of the named byte field from the persistent field.

Specified by:

get in class ObjectInputStream.GetField

Parameters:

name - the name of the field

val - the default value to use if name does not have a value

Returns:

the value of the named byte field

Throws:

IOException - if there are I/O errors while reading from the underlying InputStream

get

public char get(String name,
                char val)
         throws IOException

Description copied from class: ObjectInputStream.GetField

Get the value of the named char field from the persistent field.

Specified by:

get in class ObjectInputStream.GetField

Parameters:

name - the name of the field

val - the default value to use if name does not have a value

Returns:

the value of the named char field

Throws:

IOException - if there are I/O errors while reading from the underlying InputStream

get

public short get(String name,
                 short val)
          throws IOException

Description copied from class: ObjectInputStream.GetField

Get the value of the named short field from the persistent field.

Specified by:

get in class ObjectInputStream.GetField

Parameters:

name - the name of the field

val - the default value to use if name does not have a value

Returns:

the value of the named short field

Throws:

IOException - if there are I/O errors while reading from the underlying InputStream

get

public int get(String name,
               int val)
        throws IOException

Description copied from class: ObjectInputStream.GetField

Get the value of the named int field from the persistent field.

Specified by:

get in class ObjectInputStream.GetField

Parameters:

name - the name of the field

val - the default value to use if name does not have a value

Returns:

the value of the named int field

Throws:

IOException - if there are I/O errors while reading from the underlying InputStream

get

public float get(String name,
                 float val)
          throws IOException

Description copied from class: ObjectInputStream.GetField

Get the value of the named float field from the persistent field.

Specified by:

get in class ObjectInputStream.GetField

Parameters:

name - the name of the field

val - the default value to use if name does not have a value

Returns:

the value of the named float field

Throws:

IOException - if there are I/O errors while reading from the underlying InputStream

get

public long get(String name,
                long val)
         throws IOException

Description copied from class: ObjectInputStream.GetField

Get the value of the named long field from the persistent field.

Specified by:

get in class ObjectInputStream.GetField

Parameters:

name - the name of the field

val - the default value to use if name does not have a value

Returns:

the value of the named long field

Throws:

IOException - if there are I/O errors while reading from the underlying InputStream

get

public double get(String name,
                  double val)
           throws IOException

Description copied from class: ObjectInputStream.GetField

Get the value of the named double field from the persistent field.

Specified by:

get in class ObjectInputStream.GetField

Parameters:

name - the name of the field

val - the default value to use if name does not have a value

Returns:

the value of the named double field

Throws:

IOException - if there are I/O errors while reading from the underlying InputStream

get

public Object get(String name,
                  Object val)
           throws IOException

Description copied from class: ObjectInputStream.GetField

Get the value of the named Object field from the persistent field.

Specified by:

get in class ObjectInputStream.GetField

Parameters:

name - the name of the field

val - the default value to use if name does not have a value

Returns:

the value of the named Object field

Throws:

IOException - if there are I/O errors while reading from the underlying InputStream

readFields

void readFields()
          throws IOException

Reads primitive and object field values from stream.

Throws:

IOException

getFieldOffset

private int getFieldOffset(String name,
                           Class type)

Returns offset of field with given name and type. A specified type of null matches all types, Object.class matches all non-primitive types, and any other non-null type matches assignable types only. If no matching field is found in the (incoming) class descriptor but a matching field is present in the associated local class descriptor, returns -1. Throws IllegalArgumentException if neither incoming nor local class descriptor contains a match.