// ASM: a very small and fast Java bytecode manipulation framework
// Copyright (c) 2000-2011 INRIA, France Telecom
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package org.objectweb.asm.commons;

import java.util.List;
import org.objectweb.asm.AnnotationVisitor;
import org.objectweb.asm.Attribute;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.FieldVisitor;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.ModuleVisitor;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.RecordComponentVisitor;
import org.objectweb.asm.TypePath;

A ClassVisitor that remaps types with a Remapper. 
This visitor has several limitations. A non-exhaustive list is the following:

  
it cannot remap type names in dynamically computed strings (remapping of type names in
      static values is supported).
  
it cannot remap values derived from type names at compile time, such as
      

        
type name hashcodes used by some Java compilers to implement the string switch
            statement.
        
some compound strings used by some Java compilers to implement lambda
            deserialization.
      

Author:
Eugene Kuleshov/**
 * A {@link ClassVisitor} that remaps types with a {@link Remapper}.
 *
 * <p><i>This visitor has several limitations</i>. A non-exhaustive list is the following:
 *
 * <ul>
 *   <li>it cannot remap type names in dynamically computed strings (remapping of type names in
 *       static values is supported).
 *   <li>it cannot remap values derived from type names at compile time, such as
 *       <ul>
 *         <li>type name hashcodes used by some Java compilers to implement the string switch
 *             statement.
 *         <li>some compound strings used by some Java compilers to implement lambda
 *             deserialization.
 *       </ul>
 * </ul>
 *
 * @author Eugene Kuleshov
 */
public class ClassRemapper extends ClassVisitor {

  
The remapper used to remap the types in the visited class. /** The remapper used to remap the types in the visited class. */
  protected final Remapper remapper;

  
The internal name of the visited class. /** The internal name of the visited class. */
  protected String className;

  
Constructs a new ClassRemapper. Subclasses must not use this constructor. Instead, they must use the ClassRemapper(int, ClassVisitor, Remapper) version. 
Params:
classVisitor – the class visitor this remapper must deleted to.
remapper – the remapper to use to remap the types in the visited class./**
   * Constructs a new {@link ClassRemapper}. <i>Subclasses must not use this constructor</i>.
   * Instead, they must use the {@link #ClassRemapper(int,ClassVisitor,Remapper)} version.
   *
   * @param classVisitor the class visitor this remapper must deleted to.
   * @param remapper the remapper to use to remap the types in the visited class.
   */
  public ClassRemapper(final ClassVisitor classVisitor, final Remapper remapper) {
    this(/* latest api = */ Opcodes.ASM9, classVisitor, remapper);
  }

  
Constructs a new ClassRemapper. 
Params:
api – the ASM API version supported by this remapper. Must be one of Opcodes.ASM4, Opcodes.ASM5, Opcodes.ASM6, Opcodes.ASM7, Opcodes.ASM8 or Opcodes.ASM9.
classVisitor – the class visitor this remapper must deleted to.
remapper – the remapper to use to remap the types in the visited class./**
   * Constructs a new {@link ClassRemapper}.
   *
   * @param api the ASM API version supported by this remapper. Must be one of {@link
   *     org.objectweb.asm.Opcodes#ASM4}, {@link org.objectweb.asm.Opcodes#ASM5}, {@link
   *     org.objectweb.asm.Opcodes#ASM6}, {@link org.objectweb.asm.Opcodes#ASM7}, {@link
   *     org.objectweb.asm.Opcodes#ASM8} or {@link org.objectweb.asm.Opcodes#ASM9}.
   * @param classVisitor the class visitor this remapper must deleted to.
   * @param remapper the remapper to use to remap the types in the visited class.
   */
  protected ClassRemapper(final int api, final ClassVisitor classVisitor, final Remapper remapper) {
    super(api, classVisitor);
    this.remapper = remapper;
  }

  @Override
  public void visit(
      final int version,
      final int access,
      final String name,
      final String signature,
      final String superName,
      final String[] interfaces) {
    this.className = name;
    super.visit(
        version,
        access,
        remapper.mapType(name),
        remapper.mapSignature(signature, false),
        remapper.mapType(superName),
        interfaces == null ? null : remapper.mapTypes(interfaces));
  }

  @Override
  public ModuleVisitor visitModule(final String name, final int flags, final String version) {
    ModuleVisitor moduleVisitor = super.visitModule(remapper.mapModuleName(name), flags, version);
    return moduleVisitor == null ? null : createModuleRemapper(moduleVisitor);
  }

  @Override
  public AnnotationVisitor visitAnnotation(final String descriptor, final boolean visible) {
    AnnotationVisitor annotationVisitor =
        super.visitAnnotation(remapper.mapDesc(descriptor), visible);
    return annotationVisitor == null ? null : createAnnotationRemapper(annotationVisitor);
  }

  @Override
  public AnnotationVisitor visitTypeAnnotation(
      final int typeRef, final TypePath typePath, final String descriptor, final boolean visible) {
    AnnotationVisitor annotationVisitor =
        super.visitTypeAnnotation(typeRef, typePath, remapper.mapDesc(descriptor), visible);
    return annotationVisitor == null ? null : createAnnotationRemapper(annotationVisitor);
  }

  @Override
  public void visitAttribute(final Attribute attribute) {
    if (attribute instanceof ModuleHashesAttribute) {
      ModuleHashesAttribute moduleHashesAttribute = (ModuleHashesAttribute) attribute;
      List<String> modules = moduleHashesAttribute.modules;
      for (int i = 0; i < modules.size(); ++i) {
        modules.set(i, remapper.mapModuleName(modules.get(i)));
      }
    }
    super.visitAttribute(attribute);
  }

  @Override
  public RecordComponentVisitor visitRecordComponent(
      final String name, final String descriptor, final String signature) {
    RecordComponentVisitor recordComponentVisitor =
        super.visitRecordComponent(
            remapper.mapRecordComponentName(className, name, descriptor),
            remapper.mapDesc(descriptor),
            remapper.mapSignature(signature, true));
    return recordComponentVisitor == null
        ? null
        : createRecordComponentRemapper(recordComponentVisitor);
  }

  @Override
  public FieldVisitor visitField(
      final int access,
      final String name,
      final String descriptor,
      final String signature,
      final Object value) {
    FieldVisitor fieldVisitor =
        super.visitField(
            access,
            remapper.mapFieldName(className, name, descriptor),
            remapper.mapDesc(descriptor),
            remapper.mapSignature(signature, true),
            (value == null) ? null : remapper.mapValue(value));
    return fieldVisitor == null ? null : createFieldRemapper(fieldVisitor);
  }

  @Override
  public MethodVisitor visitMethod(
      final int access,
      final String name,
      final String descriptor,
      final String signature,
      final String[] exceptions) {
    String remappedDescriptor = remapper.mapMethodDesc(descriptor);
    MethodVisitor methodVisitor =
        super.visitMethod(
            access,
            remapper.mapMethodName(className, name, descriptor),
            remappedDescriptor,
            remapper.mapSignature(signature, false),
            exceptions == null ? null : remapper.mapTypes(exceptions));
    return methodVisitor == null ? null : createMethodRemapper(methodVisitor);
  }

  @Override
  public void visitInnerClass(
      final String name, final String outerName, final String innerName, final int access) {
    super.visitInnerClass(
        remapper.mapType(name),
        outerName == null ? null : remapper.mapType(outerName),
        innerName == null ? null : remapper.mapInnerClassName(name, outerName, innerName),
        access);
  }

  @Override
  public void visitOuterClass(final String owner, final String name, final String descriptor) {
    super.visitOuterClass(
        remapper.mapType(owner),
        name == null ? null : remapper.mapMethodName(owner, name, descriptor),
        descriptor == null ? null : remapper.mapMethodDesc(descriptor));
  }

  @Override
  public void visitNestHost(final String nestHost) {
    super.visitNestHost(remapper.mapType(nestHost));
  }

  @Override
  public void visitNestMember(final String nestMember) {
    super.visitNestMember(remapper.mapType(nestMember));
  }

  @Override
  public void visitPermittedSubclass(final String permittedSubclass) {
    super.visitPermittedSubclass(remapper.mapType(permittedSubclass));
  }

  
Constructs a new remapper for fields. The default implementation of this method returns a new FieldRemapper. 
Params:
fieldVisitor – the FieldVisitor the remapper must delegate to.
Returns:
the newly created remapper./**
   * Constructs a new remapper for fields. The default implementation of this method returns a new
   * {@link FieldRemapper}.
   *
   * @param fieldVisitor the FieldVisitor the remapper must delegate to.
   * @return the newly created remapper.
   */
  protected FieldVisitor createFieldRemapper(final FieldVisitor fieldVisitor) {
    return new FieldRemapper(api, fieldVisitor, remapper);
  }

  
Constructs a new remapper for methods. The default implementation of this method returns a new MethodRemapper. 
Params:
methodVisitor – the MethodVisitor the remapper must delegate to.
Returns:
the newly created remapper./**
   * Constructs a new remapper for methods. The default implementation of this method returns a new
   * {@link MethodRemapper}.
   *
   * @param methodVisitor the MethodVisitor the remapper must delegate to.
   * @return the newly created remapper.
   */
  protected MethodVisitor createMethodRemapper(final MethodVisitor methodVisitor) {
    return new MethodRemapper(api, methodVisitor, remapper);
  }

  
Constructs a new remapper for annotations. The default implementation of this method returns a new AnnotationRemapper. 
Params:
annotationVisitor – the AnnotationVisitor the remapper must delegate to.
Returns:
the newly created remapper./**
   * Constructs a new remapper for annotations. The default implementation of this method returns a
   * new {@link AnnotationRemapper}.
   *
   * @param annotationVisitor the AnnotationVisitor the remapper must delegate to.
   * @return the newly created remapper.
   */
  protected AnnotationVisitor createAnnotationRemapper(final AnnotationVisitor annotationVisitor) {
    return new AnnotationRemapper(api, annotationVisitor, remapper);
  }

  
Constructs a new remapper for modules. The default implementation of this method returns a new ModuleRemapper. 
Params:
moduleVisitor – the ModuleVisitor the remapper must delegate to.
Returns:
the newly created remapper./**
   * Constructs a new remapper for modules. The default implementation of this method returns a new
   * {@link ModuleRemapper}.
   *
   * @param moduleVisitor the ModuleVisitor the remapper must delegate to.
   * @return the newly created remapper.
   */
  protected ModuleVisitor createModuleRemapper(final ModuleVisitor moduleVisitor) {
    return new ModuleRemapper(api, moduleVisitor, remapper);
  }

  
Constructs a new remapper for record components. The default implementation of this method returns a new RecordComponentRemapper. 
Params:
recordComponentVisitor – the RecordComponentVisitor the remapper must delegate to.
Returns:
the newly created remapper./**
   * Constructs a new remapper for record components. The default implementation of this method
   * returns a new {@link RecordComponentRemapper}.
   *
   * @param recordComponentVisitor the RecordComponentVisitor the remapper must delegate to.
   * @return the newly created remapper.
   */
  protected RecordComponentVisitor createRecordComponentRemapper(
      final RecordComponentVisitor recordComponentVisitor) {
    return new RecordComponentRemapper(api, recordComponentVisitor, remapper);
  }
}