/**
* ASM: a very small and fast Java bytecode manipulation framework
* Copyright (c) 2000,2002,2003 INRIA, France Telecom
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
package oracle.toplink.libraries.asm.attrs;
import oracle.toplink.libraries.asm.Attribute;
import oracle.toplink.libraries.asm.ByteVector;
import oracle.toplink.libraries.asm.ClassReader;
import oracle.toplink.libraries.asm.ClassWriter;
import oracle.toplink.libraries.asm.Label;
/**
* The Signature Attribute introduced in JSR-14 (Adding Generics to the
* Java Programming Language) and also defined in the Java Virtual Machine
* Specification, 3rd edition draft. This atribute is used for classes,
* fields and methods.
* <p>
* Classfiles need to carry generic type information in a backwards
* compatible way. This is accomplished by introducing a new "Signature"
* attribute for classes, methods and fields. The structure of this
* attribute is as follows:
* <pre>
* "Signature" (u4 attr-length, u2 signature-index)
* </pre>
* When used as an attribute of a method or field, a signature gives the
* full (possibly generic) type of that method or field.
* When used as a class attribute, a signature indicates the type
* parameters of the class, followed by its supertype, followed by
* all its interfaces.
* <p>
* The type syntax in signatures is extended to parameterized types and
* type variables. There is also a new signature syntax for formal type
* parameters. The syntax extensions for signature strings are as follows:
* <pre>
* MethodOrFieldSignature ::= TypeSignature
* ClassSignature ::= ParameterPartOpt super_TypeSignature interface_TypeSignatures
* TypeSignatures ::= TypeSignatures TypeSignature
* |
* TypeSignature ::= ...
* | ClassTypeSignature
* | MethodTypeSignature
* | TypeVariableSignature
* ClassTypeSignature ::= 'L' Ident TypeArgumentsOpt ';'
* | ClassTypeSignature '.' Ident ';' TypeArgumentsOpt
* MethodTypeSignature ::= TypeArgumentsOpt '(' TypeSignatures ')'
* TypeSignature ThrowsSignatureListOpt
* ThrowsSignatureList ::= ThrowsSignature ThrowsSignatureList
* | ThrowsSignature
* ThrowsSignature ::= '^' TypeSignature
* TypeVariableSignature ::= 'T' Ident ';'
* TypeArguments ::= '<' TypeSignature TypeSignatures '>'
* ParameterPart ::= '<' ParameterSignature ParameterSignatures '>'
* ParameterSignatures ::= ParameterSignatures ParameterSignature
* |
* ParameterSignature ::= Ident ':' bound_TypeSignature
* </pre>
*
* @see <a href="http://www.jcp.org/en/jsr/detail?id=14">JSR 14 : Add Generic
* Types To The JavaTM Programming Language</a>
*
* @author Eugene Kuleshov
*/
public class SignatureAttribute extends Attribute {
public String signature;
public SignatureAttribute () {
super("Signature");
}
public SignatureAttribute (String signature) {
this();
this.signature = signature;
}
protected Attribute read (ClassReader cr, int off,
int len, char[] buf, int codeOff, Label[] labels) {
return new SignatureAttribute(cr.readUTF8(off, buf));
}
protected ByteVector write (ClassWriter cw, byte[] code,
int len, int maxStack, int maxLocals) {
return new ByteVector().putShort(cw.newUTF8(signature));
}
public String toString () {
return signature;
}
}