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Java Source Code / Java Documentation » Apache Harmony Java SE » org package » org.apache.harmony.kernel.vm 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   org.apache.harmony.kernel.vm.Objects

Objects
public class Objects (Code)

This class must be implemented by the VM to support Object manipulation.





Method Summary
public  booleancompareAndSwapInt(Object object, long fieldOffset, int expected, int update)
    

Compares and swaps the value of an int-typed field on an Object instance.


Parameters:
  object - The instance containing the field.
Parameters:
  fieldOffset - The offset value of the field.
Parameters:
  expected - The expected value of the field.
Parameters:
  update - The new value to write to the field.
public  booleancompareAndSwapLong(Object object, long fieldOffset, long expected, long update)
    

Compares and swaps the value of a long-typed field on an Object instance.


Parameters:
  object - The instance containing the field.
Parameters:
  fieldOffset - The offset value of the field.
Parameters:
  expected - The expected value of the field.
Parameters:
  update - The new value to write to the field.
public  booleancompareAndSwapObject(Object object, long fieldOffset, Object expected, Object update)
    

Compares and swaps the value of an Object-typed field on an Object instance.


Parameters:
  object - The instance containing the field.
Parameters:
  fieldOffset - The offset value of the field.
Parameters:
  expected - The expected value of the field.
Parameters:
  update - The new value to write to the field.
public  intgetArrayBaseOffset(Class clazz)
    

Retrieves the base offset for the array Class given.

public  intgetArrayIndexScale(Class clazz)
    

Retrieves the array index scale for the array Class given.

public  longgetFieldOffset(Field field)
    

Retrieves the offset value of the Field for use by other methods in this class.


Parameters:
  field - The Field to retrieve the offset for.
public static  ObjectsgetInstance()
    

Retrieves an instance of the Objects service.

public  intgetIntVolatile(Object object, long fieldOffset)
    

Reads an int value from an Object's field as though it were declared volatile.


Parameters:
  object - The instance containing the field to read from.
Parameters:
  fieldOffset - The offset of the field to read from.
public  longgetLong(Object object, long fieldOffset)
    

Reads a long value from an Object's field.


Parameters:
  object - The instance containing the field to read from.
Parameters:
  fieldOffset - The offset of the field to read from.
public  longgetLongVolatile(Object object, long fieldOffset)
    

Reads a long value from an Object's field as though it were declared volatile.


Parameters:
  object - The instance containing the field to read from.
Parameters:
  fieldOffset - The offset of the field to read from.
public  ObjectgetObjectVolatile(Object object, long fieldOffset)
    

Writes an int value to an Object's field as though it were declared volatile.

public  voidputIntVolatile(Object object, long fieldOffset, int newValue)
    

Writes an int value to an Object's field as though it were declared volatile.

public  voidputLong(Object object, long fieldOffset, long newValue)
    

Writes a long value to an Object's field.

public  voidputLongVolatile(Object object, long fieldOffset, long newValue)
    

Writes a long value to an Object's field as though it were declared volatile.

public  voidputObjectVolatile(Object object, long fieldOffset, Object newValue)
    

Writes an Object reference value to an Object's field as though it were declared volatile.




Method Detail
compareAndSwapInt
public boolean compareAndSwapInt(Object object, long fieldOffset, int expected, int update)(Code)

Compares and swaps the value of an int-typed field on an Object instance.


Parameters:
  object - The instance containing the field.
Parameters:
  fieldOffset - The offset value of the field.
Parameters:
  expected - The expected value of the field.
Parameters:
  update - The new value to write to the field. true if the field was updated, falseotherwise.



compareAndSwapLong
public boolean compareAndSwapLong(Object object, long fieldOffset, long expected, long update)(Code)

Compares and swaps the value of a long-typed field on an Object instance.


Parameters:
  object - The instance containing the field.
Parameters:
  fieldOffset - The offset value of the field.
Parameters:
  expected - The expected value of the field.
Parameters:
  update - The new value to write to the field. true if the field was updated, falseotherwise.



compareAndSwapObject
public boolean compareAndSwapObject(Object object, long fieldOffset, Object expected, Object update)(Code)

Compares and swaps the value of an Object-typed field on an Object instance.


Parameters:
  object - The instance containing the field.
Parameters:
  fieldOffset - The offset value of the field.
Parameters:
  expected - The expected value of the field.
Parameters:
  update - The new value to write to the field. true if the field was updated, falseotherwise.



getArrayBaseOffset
public int getArrayBaseOffset(Class clazz)(Code)

Retrieves the base offset for the array Class given. The Class passed MUST me an array type, such that the method Class.isArray returns true. For example, int[].class.


Parameters:
  clazz - The array Class object. The base offset value.
throws:
  NullPointerException - if clazz is null.
throws:
  IllegalArgumentException - if clazz is not an array type.



getArrayIndexScale
public int getArrayIndexScale(Class clazz)(Code)

Retrieves the array index scale for the array Class given. The index scale is the value used to determine the offset of a particular element in the array given the array's base offset and an index. The following code snippet illustrates the usage.

 int base = Objects.getArrayBaseOffset(int[].class);
 int scale = Objects.getArrayIndexScale(int[].class);
 int elementIdx = 1;
 int[] array = { 0, 1, 2 };
 long offsetForIdx = base + (elementIdx * scale);
 

The Class passed MUST me an array type, such that the method Class.isArray returns true. For example, int[].class.


Parameters:
  clazz - The array Class object. The index scale value.
throws:
  NullPointerException - if clazz is null.
throws:
  IllegalArgumentException - if clazz is not an array type.



getFieldOffset
public long getFieldOffset(Field field)(Code)

Retrieves the offset value of the Field for use by other methods in this class.


Parameters:
  field - The Field to retrieve the offset for. The offset value.



getInstance
public static Objects getInstance()(Code)

Retrieves an instance of the Objects service.

An instance of Objects.



getIntVolatile
public int getIntVolatile(Object object, long fieldOffset)(Code)

Reads an int value from an Object's field as though it were declared volatile.


Parameters:
  object - The instance containing the field to read from.
Parameters:
  fieldOffset - The offset of the field to read from. The value that was read.



getLong
public long getLong(Object object, long fieldOffset)(Code)

Reads a long value from an Object's field.


Parameters:
  object - The instance containing the field to read from.
Parameters:
  fieldOffset - The offset of the field to read from. The value that was read.



getLongVolatile
public long getLongVolatile(Object object, long fieldOffset)(Code)

Reads a long value from an Object's field as though it were declared volatile.


Parameters:
  object - The instance containing the field to read from.
Parameters:
  fieldOffset - The offset of the field to read from. The value that was read.



getObjectVolatile
public Object getObjectVolatile(Object object, long fieldOffset)(Code)

Writes an int value to an Object's field as though it were declared volatile.


Parameters:
  object - The instance containing the field to write to.
Parameters:
  fieldOffset - The offset of the field to write to.
Parameters:
  newValue - The value to write.



putIntVolatile
public void putIntVolatile(Object object, long fieldOffset, int newValue)(Code)

Writes an int value to an Object's field as though it were declared volatile.


Parameters:
  object - The instance containing the field to write to.
Parameters:
  fieldOffset - The offset of the field to write to.
Parameters:
  newValue - The value to write.



putLong
public void putLong(Object object, long fieldOffset, long newValue)(Code)

Writes a long value to an Object's field.


Parameters:
  object - The instance containing the field to write to.
Parameters:
  fieldOffset - The offset of the field to write to.
Parameters:
  newValue - The value to write.



putLongVolatile
public void putLongVolatile(Object object, long fieldOffset, long newValue)(Code)

Writes a long value to an Object's field as though it were declared volatile.


Parameters:
  object - The instance containing the field to write to.
Parameters:
  fieldOffset - The offset of the field to write to.
Parameters:
  newValue - The value to write.



putObjectVolatile
public void putObjectVolatile(Object object, long fieldOffset, Object newValue)(Code)

Writes an Object reference value to an Object's field as though it were declared volatile.


Parameters:
  object - The instance containing the field to write to.
Parameters:
  fieldOffset - The offset of the field to write to.
Parameters:
  newValue - The value to write.



Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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