Class: JavaClass::ClassFile::AccessFlags

Inherits:
Object
  • Object
show all
Defined in:
lib/javaclass/classfile/access_flags.rb

Overview

The access flags of a class or interface.

Author

Peter Kofler

Constant Summary collapse

ACC_PUBLIC =

Access flags as defined by JVM spec.

0x0001
ACC_FINAL = 
0x0010
ACC_SUPER =

old invokespecial instruction semantics

0x0020
ACC_INTERFACE = 
0x0200
ACC_ABSTRACT = 
0x0400
ACC_INNER =

TODO unknown access flag, find in spec

0x1000
ACC_OTHER = 
0xffff ^ ACC_PUBLIC ^ ACC_FINAL ^ ACC_SUPER ^ ACC_INTERFACE ^ ACC_ABSTRACT ^ ACC_INNER

Instance Method Summary collapse

Constructor Details

#initialize(data, pos) ⇒ AccessFlags

Returns a new instance of AccessFlags.



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# File 'lib/javaclass/classfile/access_flags.rb', line 19

def initialize(data, pos)
  @flags = data.u2(pos)
  raise "inconsistent flags #{@flags} (abstract and final)" if abstract? && final?
  if interface? && !abstract?
    # JDK 1.0 and 1.1 do have non abstract interfaces, fix it
    @flags = @flags | ACC_ABSTRACT
  end
  raise "inconsistent flags #{@flags} (interface not abstract)" if interface? && !abstract?
  raise "inconsistent flags #{@flags} (interface is final)" if interface? && final?
  raise "inconsistent flags #{@flags} (other value #{@flags & ACC_OTHER})" if (@flags & ACC_OTHER) != 0
end

Instance Method Details

#abstract? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/javaclass/classfile/access_flags.rb', line 41

def abstract?
 (@flags & ACC_ABSTRACT) != 0
end

#final? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/javaclass/classfile/access_flags.rb', line 37

def final?
 (@flags & ACC_FINAL) != 0
end

#interface? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/javaclass/classfile/access_flags.rb', line 45

def interface?
 (@flags & ACC_INTERFACE) != 0
end

#public? ⇒ Boolean Also known as: accessible?

Return true if the class is public.

Returns:

  • (Boolean) 


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# File 'lib/javaclass/classfile/access_flags.rb', line 32

def public?
 (@flags & ACC_PUBLIC) != 0
end