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/*
 * This file is available under and governed by the GNU General Public
 * License version 2 only, as published by the Free Software Foundation.
 * However, the following notice accompanied the original version of this
 * file:
 *
 * ASM: a very small and fast Java bytecode manipulation framework
 * Copyright (c) 2000-2011 INRIA, France Telecom
 * All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
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 *    notice, this list of conditions and the following disclaimer in the
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 *    contributors may be used to endorse or promote products derived from
 *    this software without specific prior written permission.
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package jdk.internal.org.objectweb.asm.signature;

import jdk.internal.org.objectweb.asm.Opcodes;

A visitor to visit a generic signature. The methods of this interface must be called in one of the three following orders (the last one is the only valid order for a SignatureVisitor that is returned by a method of this interface): 

  
ClassSignature = ( visitFormalTypeParameter visitClassBound? 
      visitInterfaceBound* )* (visitSuperclass visitInterface* ) 
MethodSignature = ( visitFormalTypeParameter visitClassBound? 
      visitInterfaceBound* )* (visitParameterType* visitReturnType 
      visitExceptionType* ) 
TypeSignature = visitBaseType | visitTypeVariable | 
      visitArrayType | ( visitClassType visitTypeArgument* ( 
      visitInnerClassType visitTypeArgument* )* visitEnd ) ) 
Author:
Thomas Hallgren, Eric Bruneton/**
 * A visitor to visit a generic signature. The methods of this interface must be called in one of
 * the three following orders (the last one is the only valid order for a {@link SignatureVisitor}
 * that is returned by a method of this interface):
 *
 * <ul>
 *   <li><i>ClassSignature</i> = ( {@code visitFormalTypeParameter} {@code visitClassBound}? {@code
 *       visitInterfaceBound}* )* ({@code visitSuperclass} {@code visitInterface}* )
 *   <li><i>MethodSignature</i> = ( {@code visitFormalTypeParameter} {@code visitClassBound}? {@code
 *       visitInterfaceBound}* )* ({@code visitParameterType}* {@code visitReturnType} {@code
 *       visitExceptionType}* )
 *   <li><i>TypeSignature</i> = {@code visitBaseType} | {@code visitTypeVariable} | {@code
 *       visitArrayType} | ( {@code visitClassType} {@code visitTypeArgument}* ( {@code
 *       visitInnerClassType} {@code visitTypeArgument}* )* {@code visitEnd} ) )
 * </ul>
 *
 * @author Thomas Hallgren
 * @author Eric Bruneton
 */
public abstract class SignatureVisitor {

    
Wildcard for an "extends" type argument. /** Wildcard for an "extends" type argument. */
    public static final char EXTENDS = '+';

    
Wildcard for a "super" type argument. /** Wildcard for a "super" type argument. */
    public static final char SUPER = '-';

    
Wildcard for a normal type argument. /** Wildcard for a normal type argument. */
    public static final char INSTANCEOF = '=';

    
The ASM API version implemented by this visitor. The value of this field must be one of Opcodes.ASM4, Opcodes.ASM5, Opcodes.ASM6 or Opcodes.ASM7. /**
      * The ASM API version implemented by this visitor. The value of this field must be one of {@link
      * Opcodes#ASM4}, {@link Opcodes#ASM5}, {@link Opcodes#ASM6} or {@link Opcodes#ASM7}.
      */
    protected final int api;

    
Constructs a new SignatureVisitor. 
Params:
api – the ASM API version implemented by this visitor. Must be one of Opcodes.ASM4, Opcodes.ASM5, Opcodes.ASM6 or Opcodes.ASM7./**
      * Constructs a new {@link SignatureVisitor}.
      *
      * @param api the ASM API version implemented by this visitor. Must be one of {@link
      *     Opcodes#ASM4}, {@link Opcodes#ASM5}, {@link Opcodes#ASM6} or {@link Opcodes#ASM7}.
      */
    public SignatureVisitor(final int api) {
        if (api != Opcodes.ASM6 && api != Opcodes.ASM5 && api != Opcodes.ASM4 && api != Opcodes.ASM7) {
            throw new IllegalArgumentException();
        }
        this.api = api;
    }

    
Visits a formal type parameter.
Params:
name – the name of the formal parameter./**
      * Visits a formal type parameter.
      *
      * @param name the name of the formal parameter.
      */
    public void visitFormalTypeParameter(final String name) {}

    
Visits the class bound of the last visited formal type parameter.
Returns:
a non null visitor to visit the signature of the class bound./**
      * Visits the class bound of the last visited formal type parameter.
      *
      * @return a non null visitor to visit the signature of the class bound.
      */
    public SignatureVisitor visitClassBound() {
        return this;
    }

    
Visits an interface bound of the last visited formal type parameter.
Returns:
a non null visitor to visit the signature of the interface bound./**
      * Visits an interface bound of the last visited formal type parameter.
      *
      * @return a non null visitor to visit the signature of the interface bound.
      */
    public SignatureVisitor visitInterfaceBound() {
        return this;
    }

    
Visits the type of the super class.
Returns:
a non null visitor to visit the signature of the super class type./**
      * Visits the type of the super class.
      *
      * @return a non null visitor to visit the signature of the super class type.
      */
    public SignatureVisitor visitSuperclass() {
        return this;
    }

    
Visits the type of an interface implemented by the class.
Returns:
a non null visitor to visit the signature of the interface type./**
      * Visits the type of an interface implemented by the class.
      *
      * @return a non null visitor to visit the signature of the interface type.
      */
    public SignatureVisitor visitInterface() {
        return this;
    }

    
Visits the type of a method parameter.
Returns:
a non null visitor to visit the signature of the parameter type./**
      * Visits the type of a method parameter.
      *
      * @return a non null visitor to visit the signature of the parameter type.
      */
    public SignatureVisitor visitParameterType() {
        return this;
    }

    
Visits the return type of the method.
Returns:
a non null visitor to visit the signature of the return type./**
      * Visits the return type of the method.
      *
      * @return a non null visitor to visit the signature of the return type.
      */
    public SignatureVisitor visitReturnType() {
        return this;
    }

    
Visits the type of a method exception.
Returns:
a non null visitor to visit the signature of the exception type./**
      * Visits the type of a method exception.
      *
      * @return a non null visitor to visit the signature of the exception type.
      */
    public SignatureVisitor visitExceptionType() {
        return this;
    }

    
Visits a signature corresponding to a primitive type.
Params:
descriptor – the descriptor of the primitive type, or 'V' for void ./**
      * Visits a signature corresponding to a primitive type.
      *
      * @param descriptor the descriptor of the primitive type, or 'V' for {@code void} .
      */
    public void visitBaseType(final char descriptor) {}

    
Visits a signature corresponding to a type variable.
Params:
name – the name of the type variable./**
      * Visits a signature corresponding to a type variable.
      *
      * @param name the name of the type variable.
      */
    public void visitTypeVariable(final String name) {}

    
Visits a signature corresponding to an array type.
Returns:
a non null visitor to visit the signature of the array element type./**
      * Visits a signature corresponding to an array type.
      *
      * @return a non null visitor to visit the signature of the array element type.
      */
    public SignatureVisitor visitArrayType() {
        return this;
    }

    
Starts the visit of a signature corresponding to a class or interface type.
Params:
name – the internal name of the class or interface./**
      * Starts the visit of a signature corresponding to a class or interface type.
      *
      * @param name the internal name of the class or interface.
      */
    public void visitClassType(final String name) {}

    
Visits an inner class.
Params:
name – the local name of the inner class in its enclosing class./**
      * Visits an inner class.
      *
      * @param name the local name of the inner class in its enclosing class.
      */
    public void visitInnerClassType(final String name) {}

    
Visits an unbounded type argument of the last visited class or inner class type. /** Visits an unbounded type argument of the last visited class or inner class type. */
    public void visitTypeArgument() {}

    
Visits a type argument of the last visited class or inner class type.
Params:
wildcard – '+', '-' or '='.
Returns:
a non null visitor to visit the signature of the type argument./**
      * Visits a type argument of the last visited class or inner class type.
      *
      * @param wildcard '+', '-' or '='.
      * @return a non null visitor to visit the signature of the type argument.
      */
    public SignatureVisitor visitTypeArgument(final char wildcard) {
        return this;
    }

    
Ends the visit of a signature corresponding to a class or interface type. /** Ends the visit of a signature corresponding to a class or interface type. */
    public void visitEnd() {}
}