oracle.jdeveloper.java.legacy
Class JotNames

java.lang.Object
  oracle.jdeveloper.java.legacy.JotNames

public class JotNames
extends java.lang.Object

This class contains the legacy routines from oracle.jdeveloper.jot.JotNames for manipulating Java names and identifiers.

From JotNames:

Provides utility methods for manipulating Java names and identifiers.

Java class names are expressed in three forms: Java names, as used in Java source code; signature descriptors; and modified signature descriptors. The relationship between the three forms is shown in this table.

Java source	Signature Descriptor	Modified Signature Descriptor
byte	B	B
char	C	C
double	D	D
float	F	F
int	I	I
long	J	J
short	S	S
boolean	Z	Z
package.Class	Lpackage/Class;	Lpackage.Class;
type[]	[type	[type

The signature formats differ only in the choice of a class delimiter character.

See Also:

"The Java Virtual Machine Specification, section 4.3.2"

Field Summary

static java.lang.Class[]	PRIMITIVE_CLASSES An array of the Java class objects that represent primitive types.
static java.lang.String	SIGS The string of type descriptors: "L[BCDFIJSVZ".
static java.lang.String[]	TYPES An array of Java type names.

Constructor Summary

JotNames()

Method Summary

static java.lang.Class	classForName(java.lang.String type) Loads the named class using the default loader.
static java.lang.String	dotSignatureToType(java.lang.String signature) Converts a modified signature descriptor into a Java type name.
static java.lang.String	getClassName(java.lang.String pkg, java.lang.String name) Concatenates a package name and a class name to produce a class name.
static java.lang.String	getPackageFromFullClassName(java.lang.String fullName) Extracts the package name from a qualified name.
static java.lang.String	getShortClassName(java.lang.String fullName) Extracts a class name from a qualified name.
static int	getSignatureItemCount(java.lang.String signature) Retrieves the number of field descriptors in a signature.
static boolean	isKeyword(java.lang.String name) Returns true if name is a Java keyword.
static boolean	isValidClassName(java.lang.String name) Returns true if name is a valid Java class name.
static boolean	isValidIdentifier(java.lang.String name) Returns true if name is a valid Java identifier.
static java.lang.Class	primitiveClassForName(java.lang.String dotSignature) Retrieves the class object representing a primitive type.
static java.lang.String	signatureToType(java.lang.String signature) Converts a signature descriptor into a Java type name.
static java.lang.String[]	signatureToTypes(java.lang.String signature) Converts a string of signature descriptors into an array of Java type names.
static java.lang.String	typeToDotSignature(java.lang.String type) Converts a Java type name into a modified signature descriptor.

Methods inherited from class java.lang.Object

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

Field Detail

SIGS

public static final java.lang.String SIGS

The string of type descriptors: "L[BCDFIJSVZ". Each character is a code for a type. This list is arranged to be parallel to TYPES.

See Also:

"The Java Virtual Machine Specification, section 4.3.2", TYPES, Constant Field Values

TYPES

public static final java.lang.String[] TYPES

An array of Java type names. The elements are the names of primitive types plus "<class>" and "<array>"

PRIMITIVE_CLASSES

public static final java.lang.Class[] PRIMITIVE_CLASSES

An array of the Java class objects that represent primitive types. This array is arranged to be parallel to TYPES.

See Also:

TYPES

Constructor Detail

JotNames

public JotNames()

Method Detail

getClassName

public static final java.lang.String getClassName(java.lang.String pkg,
                                                  java.lang.String name)

Concatenates a package name and a class name to produce a class name.

Parameters:

pkg - a package name or null.

name - an identifier.

Returns:

pkg + "." + name, or name alone if pkg is null or empty.

getShortClassName

public static final java.lang.String getShortClassName(java.lang.String fullName)

Extracts a class name from a qualified name.

Parameters:

fullName - a Java name; a sequence of identifiers with interspersed '.' tokens.

Returns:

the identifier that follows the last '.' token, or all of fullName if it contains no '.' tokens.

getPackageFromFullClassName

public static final java.lang.String getPackageFromFullClassName(java.lang.String fullName)

Extracts the package name from a qualified name.

Parameters:

fullName - a Java name; a sequence of identifiers with interspersed '.' tokens.

Returns:

the portion of fullName that precedes the last '.' token, or the empty string if fullName contains no '.' tokens.

isKeyword

public static boolean isKeyword(java.lang.String name)

Returns true if name is a Java keyword.

Parameters:

name - a string.

isValidIdentifier

public static boolean isValidIdentifier(java.lang.String name)

Returns true if name is a valid Java identifier.

Parameters:

name - a string.

isValidClassName

public static boolean isValidClassName(java.lang.String name)

Returns true if name is a valid Java class name. A class name is a sequence of identifiers with interspersed '.' tokens.

Parameters:

name - a string.

typeToDotSignature

public static final java.lang.String typeToDotSignature(java.lang.String type)

Converts a Java type name into a modified signature descriptor.

Parameters:

type - a qualified name of a Java primitive, class, or array type.

Returns:

a descriptor string in which '.' tokens are substituted for '/' tokens.

See Also:

"The Java Virtual Machine Specification, section 4.3.2"

dotSignatureToType

public static java.lang.String dotSignatureToType(java.lang.String signature)

Converts a modified signature descriptor into a Java type name.

Parameters:

signature - a descriptor string in which '.' tokens are substituted for '/' tokens.

Returns:

a qualified Java primitive, class, or array type name, or signature unchanged if signature is not a descriptor.

See Also:

"The Java Virtual Machine Specification, section 4.3.2"

signatureToType

public static java.lang.String signatureToType(java.lang.String signature)

Converts a signature descriptor into a Java type name.

Parameters:

signature - a descriptor string.

Returns:

a qualified Java primitive, class, or array type name. Return null if signature is not a descriptor.

See Also:

"The Java Virtual Machine Specification, section 4.3.2"

getSignatureItemCount

public static int getSignatureItemCount(java.lang.String signature)

Retrieves the number of field descriptors in a signature. For example, the signature ILjava/lang/String;[Ljava/lang/String; has three descriptors, I, Ljava/lang/String;, and [Ljava/lang/String;. These would correspond to the types int, java.lang.String, and java.lang.String[].

Parameters:

signature - the signature, expressed as a String composed of field descriptors.

Returns:

the number of field descriptors in the signature.

See Also:

"Section 4.3.2 of the Java Virtual Machine Specification Second Edition"

signatureToTypes

public static java.lang.String[] signatureToTypes(java.lang.String signature)

Converts a string of signature descriptors into an array of Java type names.

Parameters:

signature - a descriptor string.

Returns:

an array of qualified Java primitive, class, or array type names.

See Also:

"The Java Virtual Machine Specification, section 4.3.2"

classForName

public static final java.lang.Class classForName(java.lang.String type)
                                          throws java.lang.ClassNotFoundException

Loads the named class using the default loader.

Parameters:

type - a qualified Java primitive, class, or array type name.

Returns:

the named class.

Throws:

java.lang.ClassNotFoundException - if the class could not be found.

See Also:

"The Java Virtual Machine Specification, section 4.3.2"

primitiveClassForName

public static final java.lang.Class primitiveClassForName(java.lang.String dotSignature)

Retrieves the class object representing a primitive type.

Parameters:

dotSignature - a one-character string containing a type descriptor character for a primitive type.

Returns:

the class representation of a primitive type, or null if dotSignature does not contain a descriptor for a primitive type.

See Also:

SIGS