jawa.constants module

class jawa.constants.Constant(pool, index)

Bases: object

The base class for all Constant* types.

index

pool

class jawa.constants.ConstantClass(pool, index, name_index)

Bases: jawa.constants.Constant

TAG = 7

name

name_index

pack()

class jawa.constants.ConstantPool

Bases: object

append(constant)

Appends a new constant to the end of the pool.

create_class(name: str) → jawa.constants.ConstantClass

Creates a new ConstantClass, adding it to the pool and returning it.

Parameters:name – The name of the new class.

create_double(value: float) → jawa.constants.Double

Creates a new ConstantDouble, adding it to the pool and returning it.

Parameters:value – The value of the new Double.

create_field_ref(class_: str, field: str, descriptor: str) → jawa.constants.FieldReference

Creates a new ConstantFieldRef, adding it to the pool and returning it.

Parameters:

• class – The name of the class to which field belongs.
• field – The name of the field.
• descriptor – The descriptor for field.

create_float(value: float) → jawa.constants.Float

Creates a new ConstantFloat, adding it to the pool and returning it.

Parameters:value – The value of the new float.

create_integer(value: int) → jawa.constants.Integer

Creates a new ConstantInteger, adding it to the pool and returning it.

Parameters:value – The value of the new integer.

create_interface_method_ref(class_: str, if_method: str, descriptor: str) → jawa.constants.InterfaceMethodRef

Creates a new ConstantInterfaceMethodRef, adding it to the pool and returning it.

Parameters:

• class – The name of the class to which if_method belongs.
• if_method – The name of the interface method.
• descriptor – The descriptor for if_method.

create_long(value: int) → jawa.constants.Long

Creates a new ConstantLong, adding it to the pool and returning it.

Parameters:value – The value of the new long.

create_method_ref(class_: str, method: str, descriptor: str) → jawa.constants.MethodReference

Creates a new ConstantMethodRef, adding it to the pool and returning it.

Parameters:

• class – The name of the class to which method belongs.
• method – The name of the method.
• descriptor – The descriptor for method.

create_name_and_type(name: str, descriptor: str) → jawa.constants.NameAndType

Creates a new ConstantNameAndType, adding it to the pool and returning it.

Parameters:

• name – The name of the class.
• descriptor – The descriptor for name.

create_string(value: str) → jawa.constants.String

Creates a new ConstantString, adding it to the pool and returning it.

Parameters:value – The value of the new string as a UTF8 string.

create_utf8(value)

Creates a new ConstantUTF8, adding it to the pool and returning it.

Parameters:value – The value of the new UTF8 string.

find(type_=None, f=None)

Iterates over the pool, yielding each matching Constant. Calling without any arguments is equivalent to iterating over the pool.

Parameters:

• type – Any subclass of Constant or None.
• f – Any callable which takes one argument (the constant).

find_one(*args, **kwargs)

Same as find() but returns only the first result, or None if nothing was found.

get(index)

Returns the Constant at index, raising a KeyError if it does not exist.

pack(fout)

Write the ConstantPool to the file-like object fout.

Note

Advanced usage only. You will typically never need to call this method as it will be calle=d for you when saving a ClassFile.

Parameters:fout – Any file-like object providing write()

raw_count

The number of Constants in the ConstantPool, including padding.

unpack(fio)

Read the ConstantPool from the file-like object fio.

Note

Advanced usage only. You will typically never need to call this method as it will be called for you when loading a ClassFile.

Parameters:fio – Any file-like object providing read()

class jawa.constants.Double(pool, index, value)

Bases: jawa.constants.Number

TAG = 6

pack()

class jawa.constants.FieldReference(pool, index, class_index, name_and_type_index)

Bases: jawa.constants.Reference

TAG = 9

class jawa.constants.Float(pool, index, value)

Bases: jawa.constants.Number

TAG = 4

pack()

class jawa.constants.Integer(pool, index, value)

Bases: jawa.constants.Number

TAG = 3

pack()

class jawa.constants.InterfaceMethodRef(pool, index, class_index, name_and_type_index)

Bases: jawa.constants.Reference

TAG = 11

class jawa.constants.InvokeDynamic(pool, index, bootstrap_method_attr_index, name_and_type_index)

Bases: jawa.constants.Constant

TAG = 18

bootstrap_method_attr_index

method_attr_index

name_and_type

name_and_type_index

pack()

class jawa.constants.Long(pool, index, value)

Bases: jawa.constants.Number

TAG = 5

pack()

class jawa.constants.MethodHandle(pool, index, reference_kind, reference_index)

Bases: jawa.constants.Constant

TAG = 15

pack()

reference

reference_index

reference_kind

class jawa.constants.MethodReference(pool, index, class_index, name_and_type_index)

Bases: jawa.constants.Reference

TAG = 10

class jawa.constants.MethodType(pool, index, descriptor_index)

Bases: jawa.constants.Constant

TAG = 16

descriptor

descriptor_index

pack()

class jawa.constants.Module(pool, index, name_index)

Bases: jawa.constants.ConstantClass

TAG = 19

name_index

class jawa.constants.NameAndType(pool, index, name_index, descriptor_index)

Bases: jawa.constants.Constant

TAG = 12

descriptor

descriptor_index

name

name_index

pack()

class jawa.constants.Number(pool, index, value)

Bases: jawa.constants.Constant

value

class jawa.constants.PackageInfo(pool, index, name_index)

Bases: jawa.constants.ConstantClass

TAG = 20

name_index

class jawa.constants.Reference(pool, index, class_index, name_and_type_index)

Bases: jawa.constants.Constant

TAG = None

class_

class_index

name_and_type

name_and_type_index

pack()

class jawa.constants.String(pool, index, string_index)

Bases: jawa.constants.Constant

TAG = 8

pack()

string

string_index

class jawa.constants.UTF8(pool, index, value)

Bases: jawa.constants.Constant

TAG = 1

pack()

value