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Java Source Code / Java Documentation » Science » javolution 5.2 » javolution.io 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   javolution.io.Struct
      javolution.io.Union

Union
abstract public class Union extends Struct (Code)

This class represents a C/C++ union; it works in the same way as Struct (sub-class) except that all members are mapped to the same location in memory.

Here is an example of C union: [code] union Number { int asInt; float asFloat; char asString[12]; };[/code] And its Java equivalent:[code] public class Number extends Union { Signed32 asInt = new Signed32(); Float32 asFloat = new Float32(); Utf8String asString = new Utf8String(12); }[/code] As for any Struct , fields are directly accessible:[code] Number num = new Number(); num.asInt.set(23); num.asString.set("23"); // Null terminated (C compatible) float f = num.asFloat.get();[/code]
author:
   Jean-Marie Dautelle
version:
   1.0, October 4, 2004




Constructor Summary
public  Union()
     Default constructor.

Method Summary
final public  booleanisUnion()
     Returns true.


Constructor Detail
Union
public Union()(Code)
Default constructor.




Method Detail
isUnion
final public boolean isUnion()(Code)
Returns true. true



Fields inherited from javolution.io.Struct
final public static Configurable MAXIMUM_ALIGNMENT(Code)(Java Doc)

Methods inherited from javolution.io.Struct
final public long address()(Code)(Java Doc)
protected Struct[] array(Struct[] structs)(Code)(Java Doc)
protected Struct[][] array(Struct[][] structs)(Code)(Java Doc)
protected Struct[][][] array(Struct[][][] structs)(Code)(Java Doc)
protected Member[] array(Member[] arrayMember)(Code)(Java Doc)
protected Member[][] array(Member[][] arrayMember)(Code)(Java Doc)
protected Member[][][] array(Member[][][] arrayMember)(Code)(Java Doc)
protected UTF8String[] array(UTF8String[] array, int stringLength)(Code)(Java Doc)
public ByteOrder byteOrder()(Code)(Java Doc)
final public ByteBuffer getByteBuffer()(Code)(Java Doc)
final public int getByteBufferPosition()(Code)(Java Doc)
protected Struct inner(Struct struct)(Code)(Java Doc)
public boolean isPacked()(Code)(Java Doc)
public boolean isUnion()(Code)(Java Doc)
public int read(InputStream in) throws IOException(Code)(Java Doc)
final public Struct setByteBuffer(ByteBuffer byteBuffer, int position)(Code)(Java Doc)
final public Struct setByteBufferPosition(int position)(Code)(Java Doc)
final public int size()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
public void write(OutputStream out) throws IOException(Code)(Java Doc)

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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