edu.arizona.cs.mbel.signature
Class Constraint

java.lang.Object
  edu.arizona.cs.mbel.signature.Signature
      edu.arizona.cs.mbel.signature.Constraint

All Implemented Interfaces:

SignatureConstants

public class Constraint

extends edu.arizona.cs.mbel.signature.Signature

This class decsribes a constraint on a local var. As of right now, the only possible constraint is ELEMENT_TYPE_PINNED, so this class is kinda useless.

Field Summary

Fields inherited from interface edu.arizona.cs.mbel.signature.SignatureConstants

ELEMENT_TYPE_ARRAY, ELEMENT_TYPE_BOOLEAN, ELEMENT_TYPE_BYREF, ELEMENT_TYPE_CHAR, ELEMENT_TYPE_CLASS, ELEMENT_TYPE_CMOD_OPT, ELEMENT_TYPE_CMOD_REQD, ELEMENT_TYPE_END, ELEMENT_TYPE_FNPTR, ELEMENT_TYPE_I, ELEMENT_TYPE_I1, ELEMENT_TYPE_I2, ELEMENT_TYPE_I4, ELEMENT_TYPE_I8, ELEMENT_TYPE_INTERNAL, ELEMENT_TYPE_MODIFIER, ELEMENT_TYPE_OBJECT, ELEMENT_TYPE_PINNED, ELEMENT_TYPE_PTR, ELEMENT_TYPE_R4, ELEMENT_TYPE_R8, ELEMENT_TYPE_SENTINEL, ELEMENT_TYPE_STRING, ELEMENT_TYPE_SZARRAY, ELEMENT_TYPE_TYPEDBYREF, ELEMENT_TYPE_TYPEONLY, ELEMENT_TYPE_U, ELEMENT_TYPE_U1, ELEMENT_TYPE_U2, ELEMENT_TYPE_U4, ELEMENT_TYPE_U8, ELEMENT_TYPE_VALUETYPE, ELEMENT_TYPE_VOID

Constructor Summary

Constraint()
Makes a new Constraint (with type PINNED)

Method Summary

void	emit(ByteBuffer buffer, ClassEmitter emitter) Writes this signature out to a buffer in raw binary form
static byte[]	encodeInteger(long value) Converts an unsigned integer to its PackedLen integer equivalent
byte	getElementType() Returns the type of constraint this is (as of now, always ELEMENT_TYPE_PINNED)
static byte[]	makeTypeDefOrRefEncoded(int table, int row) Turns a {table num, row num} into a TypeDefOrRefEncoded integer value
static Constraint	parse(ByteBuffer buffer) Factory method for parsing a constraint from a raw binary blob
static int[]	parseTypeDefOrRefEncoded(ByteBuffer buffer) Reads a TypeDefOrRefEncoded blob from the given buffer, and returns an int array in the form of {table number, row number}
static int	readCodedInteger(ByteBuffer buffer) Parses a PackedLen coded integer from the given buffer
java.lang.String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

Constraint

public Constraint()

Makes a new Constraint (with type PINNED)

Method Detail

parse

public static Constraint parse(ByteBuffer buffer)

Factory method for parsing a constraint from a raw binary blob

Parameters:

buffer - the buffer to read from

Returns:

a Constraint representing the given blob, or null if there was a parse error

getElementType

public byte getElementType()

Returns the type of constraint this is (as of now, always ELEMENT_TYPE_PINNED)

emit

public void emit(ByteBuffer buffer,
                 ClassEmitter emitter)

Writes this signature out to a buffer in raw binary form

Parameters:

buffer - the buffer to write to

toString

public java.lang.String toString()

readCodedInteger

public static int readCodedInteger(ByteBuffer buffer)

Parses a PackedLen coded integer from the given buffer

Parameters:

buffer - the buffer

Returns:

the decoded integer value

parseTypeDefOrRefEncoded

public static int[] parseTypeDefOrRefEncoded(ByteBuffer buffer)

Reads a TypeDefOrRefEncoded blob from the given buffer, and returns an int array in the form of {table number, row number}

Parameters:

buffer - the buffer to read from

Returns:

an int array with {table num, row num}

makeTypeDefOrRefEncoded

public static byte[] makeTypeDefOrRefEncoded(int table,
                                             int row)

Turns a {table num, row num} into a TypeDefOrRefEncoded integer value

Parameters:

table - the table number (i.e. one of TypeDef, TypeRef, TypeSpec)

row - the row number within the given table (1-based index)

Returns:

the raw binary TypeDefOrRefEncoded blob

encodeInteger

public static byte[] encodeInteger(long value)

Converts an unsigned integer to its PackedLen integer equivalent

Parameters:

value - the value to convert to PackedLen form

Returns:

the raw binary PackedLen blob corresponding to value