org.multijava.util.classfile
Class UniverseClassAttribute

java.lang.Object
  org.multijava.util.classfile.Attribute
      org.multijava.util.classfile.UniverseClassAttribute

public class UniverseClassAttribute

extends Attribute

This class implements a JUTS class attribute. It contains the JUTS version (e.g. "1.0") plus a boolean flag that indicates if the class has been compiled with run-time checks enabled. The format of the attribute (not including the standard initial six bytes): - the first two bytes are an index into the constant pool. The constant pool entry at that index must be String constant - the next byte is interpreted as a boolean value, and tells if the class has run-time checks enabled or not This attribute is recognized by UniverseAttributeParser. VMS 4.7.1: The attribute's name is org.multijava.universe_class

Author:

AHS

See Also:

UniverseAttributeParser

Field Summary
private static AsciiConstant	attr
private  boolean	runtimeSupport           does the class have run-time checks enabled?
(package private) static String	tagString           the name of the attribute
private  AsciiConstant	version           the version of JUTS used

 

Constructor Summary

UniverseClassAttribute(DataInput in, ConstantPool cp)           Constructs a universe version attribute from a classfile stream.

UniverseClassAttribute(String version, boolean runtimeSupport)           Create a Universe version attribute.

 

Method Summary
protected  int	getSize()           Returns the space in bytes used by this attribute in the classfile.
protected  int	getTag()           Returns the attribute's tag.
String	getVersion()           Return the version of the Universe Type System used.
boolean	hasRuntimeSupport()           Return if the class was compiled with run-time support enabled.
protected  void	resolveConstants(ConstantPool cp)           Insert or check location of constant value on constant pool.
protected  void	write(ConstantPool cp, DataOutput out)           Write this class into the the file (out) getting data position from the constant pool.

 

Methods inherited from class java.lang.Object

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

 

Field Detail

tagString

static final String tagString

the name of the attribute

attr

private static AsciiConstant attr

version

private AsciiConstant version

the version of JUTS used

runtimeSupport

private boolean runtimeSupport

does the class have run-time checks enabled?

UniverseClassAttribute

public UniverseClassAttribute(String version,
                              boolean runtimeSupport)

Create a Universe version attribute.

Parameters:

version - the version of the Universe Type System used

runtimeSupport - does the class have run-time checks

UniverseClassAttribute

public UniverseClassAttribute(DataInput in,
                              ConstantPool cp)
                       throws IOException,
                              ClassFileFormatException

Constructs a universe version attribute from a classfile stream.

Parameters:

in - the stream to read from

cp - the constant pool

Throws:

IOException - an IO problem has occured

ClassFileFormatException - the classfile is malformed

getTag

protected int getTag()

Returns the attribute's tag.

getSize

protected int getSize()

Returns the space in bytes used by this attribute in the classfile.

getVersion

public String getVersion()

Return the version of the Universe Type System used.

See Also:

version

hasRuntimeSupport

public boolean hasRuntimeSupport()

Return if the class was compiled with run-time support enabled.

See Also:

runtimeSupport

resolveConstants

protected void resolveConstants(ConstantPool cp)

Insert or check location of constant value on constant pool.

Parameters:

cp - the constant pool for this class

write

protected void write(ConstantPool cp,
                     DataOutput out)
              throws IOException

Write this class into the the file (out) getting data position from the constant pool.

Parameters:

cp - the constant pool

out - the output stream

Throws:

IOException - an IO problem has occurred