org.objectweb.asm

Class Type


public class Type
extends Object

A Java type. This class can be used to make it easier to manipulate type and method descriptors.
Author:
Eric Bruneton, Chris Nokleberg

Field Summary

static int
ARRAY
The sort of array reference types.
static int
BOOLEAN
The sort of the boolean type.
static Type
BOOLEAN_TYPE
The boolean type.
static int
BYTE
The sort of the byte type.
static Type
BYTE_TYPE
The byte type.
static int
CHAR
The sort of the char type.
static Type
CHAR_TYPE
The char type.
static int
DOUBLE
The sort of the double type.
static Type
DOUBLE_TYPE
The double type.
static int
FLOAT
The sort of the float type.
static Type
FLOAT_TYPE
The float type.
static int
INT
The sort of the int type.
static Type
INT_TYPE
The int type.
static int
LONG
The sort of the long type.
static Type
LONG_TYPE
The long type.
static int
OBJECT
The sort of object reference type.
static int
SHORT
The sort of the short type.
static Type
SHORT_TYPE
The short type.
static int
VOID
The sort of the void type.
static Type
VOID_TYPE
The void type.

Method Summary

boolean
equals(Object o)
Tests if the given object is equal to this type.
static Type[]
getArgumentTypes(Method method)
Returns the Java types corresponding to the argument types of the given method.
static Type[]
getArgumentTypes(String methodDescriptor)
Returns the Java types corresponding to the argument types of the given method descriptor.
String
getClassName()
Returns the name of the class corresponding to this type.
String
getDescriptor()
Returns the descriptor corresponding to this Java type.
static String
getDescriptor(Class c)
Returns the descriptor corresponding to the given Java type.
int
getDimensions()
Returns the number of dimensions of this array type.
Type
getElementType()
Returns the type of the elements of this array type.
String
getInternalName()
Returns the internal name of the class corresponding to this object type.
static String
getInternalName(Class c)
Returns the internal name of the given class.
static String
getMethodDescriptor(Method m)
Returns the descriptor corresponding to the given method.
static String
getMethodDescriptor(Type returnType, Type[] argumentTypes)
Returns the descriptor corresponding to the given argument and return types.
int
getOpcode(int opcode)
Returns a JVM instruction opcode adapted to this Java type.
static Type
getReturnType(Method method)
Returns the Java type corresponding to the return type of the given method.
static Type
getReturnType(String methodDescriptor)
Returns the Java type corresponding to the return type of the given method descriptor.
int
getSize()
Returns the size of values of this type.
int
getSort()
Returns the sort of this Java type.
static Type
getType(Class c)
Returns the Java type corresponding to the given class.
static Type
getType(String typeDescriptor)
Returns the Java type corresponding to the given type descriptor.
int
hashCode()
Returns a hash code value for this type.
String
toString()
Returns a string representation of this type.

Field Details

ARRAY

public static final int ARRAY
Field Value:
9

BOOLEAN

public static final int BOOLEAN
Field Value:
1

BOOLEAN_TYPE

public static final Type BOOLEAN_TYPE
The boolean type.

BYTE

public static final int BYTE
Field Value:
3

BYTE_TYPE

public static final Type BYTE_TYPE
The byte type.

CHAR

public static final int CHAR
Field Value:
2

CHAR_TYPE

public static final Type CHAR_TYPE
The char type.

DOUBLE

public static final int DOUBLE
Field Value:
8

DOUBLE_TYPE

public static final Type DOUBLE_TYPE
The double type.

FLOAT

public static final int FLOAT
Field Value:
6

FLOAT_TYPE

public static final Type FLOAT_TYPE
The float type.

INT

public static final int INT
Field Value:
5

INT_TYPE

public static final Type INT_TYPE
The int type.

LONG

public static final int LONG
Field Value:
7

LONG_TYPE

public static final Type LONG_TYPE
The long type.

OBJECT

public static final int OBJECT
Field Value:
10

SHORT

public static final int SHORT
Field Value:
4

SHORT_TYPE

public static final Type SHORT_TYPE
The short type.

VOID

public static final int VOID
Field Value:
0

VOID_TYPE

public static final Type VOID_TYPE
The void type.

Method Details

equals

public boolean equals(Object o)
Tests if the given object is equal to this type.
Parameters:
o - the object to be compared to this type.
Returns:
true if the given object is equal to this type.

getArgumentTypes

public static Type[] getArgumentTypes(Method method)
Returns the Java types corresponding to the argument types of the given method.
Parameters:
method - a method.
Returns:
the Java types corresponding to the argument types of the given method.

getArgumentTypes

public static Type[] getArgumentTypes(String methodDescriptor)
Returns the Java types corresponding to the argument types of the given method descriptor.
Parameters:
methodDescriptor - a method descriptor.
Returns:
the Java types corresponding to the argument types of the given method descriptor.

getClassName

public String getClassName()
Returns the name of the class corresponding to this type.
Returns:
the fully qualified name of the class corresponding to this type.

getDescriptor

public String getDescriptor()
Returns the descriptor corresponding to this Java type.
Returns:
the descriptor corresponding to this Java type.

getDescriptor

public static String getDescriptor(Class c)
Returns the descriptor corresponding to the given Java type.
Parameters:
c - an object class, a primitive class or an array class.
Returns:
the descriptor corresponding to the given class.

getDimensions

public int getDimensions()
Returns the number of dimensions of this array type. This method should only be used for an array type.
Returns:
the number of dimensions of this array type.

getElementType

public Type getElementType()
Returns the type of the elements of this array type. This method should only be used for an array type.
Returns:
Returns the type of the elements of this array type.

getInternalName

public String getInternalName()
Returns the internal name of the class corresponding to this object type. The internal name of a class is its fully qualified name, where '.' are replaced by '/'. This method should only be used for an object type.
Returns:
the internal name of the class corresponding to this object type.

getInternalName

public static String getInternalName(Class c)
Returns the internal name of the given class. The internal name of a class is its fully qualified name, where '.' are replaced by '/'.
Parameters:
c - an object class.
Returns:
the internal name of the given class.

getMethodDescriptor

public static String getMethodDescriptor(Method m)
Returns the descriptor corresponding to the given method.
Parameters:
m - a Method object.
Returns:
the descriptor of the given method.

getMethodDescriptor

public static String getMethodDescriptor(Type returnType,
                                         Type[] argumentTypes)
Returns the descriptor corresponding to the given argument and return types.
Parameters:
returnType - the return type of the method.
argumentTypes - the argument types of the method.
Returns:
the descriptor corresponding to the given argument and return types.

getOpcode

public int getOpcode(int opcode)
Returns a JVM instruction opcode adapted to this Java type.
Parameters:
opcode - a JVM instruction opcode. This opcode must be one of ILOAD, ISTORE, IALOAD, IASTORE, IADD, ISUB, IMUL, IDIV, IREM, INEG, ISHL, ISHR, IUSHR, IAND, IOR, IXOR and IRETURN.
Returns:
an opcode that is similar to the given opcode, but adapted to this Java type. For example, if this type is float and opcode is IRETURN, this method returns FRETURN.

getReturnType

public static Type getReturnType(Method method)
Returns the Java type corresponding to the return type of the given method.
Parameters:
method - a method.
Returns:
the Java type corresponding to the return type of the given method.

getReturnType

public static Type getReturnType(String methodDescriptor)
Returns the Java type corresponding to the return type of the given method descriptor.
Parameters:
methodDescriptor - a method descriptor.
Returns:
the Java type corresponding to the return type of the given method descriptor.

getSize

public int getSize()
Returns the size of values of this type.
Returns:
the size of values of this type, i.e., 2 for long and double, and 1 otherwise.

getSort

public int getSort()
Returns the sort of this Java type.

getType

public static Type getType(Class c)
Returns the Java type corresponding to the given class.
Parameters:
c - a class.
Returns:
the Java type corresponding to the given class.

getType

public static Type getType(String typeDescriptor)
Returns the Java type corresponding to the given type descriptor.
Parameters:
typeDescriptor - a type descriptor.
Returns:
the Java type corresponding to the given type descriptor.

hashCode

public int hashCode()
Returns a hash code value for this type.
Returns:
a hash code value for this type.

toString

public String toString()
Returns a string representation of this type.
Returns:
the descriptor of this type.