// ASM: a very small and fast Java bytecode manipulation framework
// Copyright (c) 2000-2011 INRIA, France Telecom
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package org.apache.tapestry5.internal.plastic.asm.commons;

import org.apache.tapestry5.internal.plastic.asm.AnnotationVisitor;
import org.apache.tapestry5.internal.plastic.asm.Opcodes;

/**
 * An {@link AnnotationVisitor} that remaps types with a {@link Remapper}.
 *
 * @author Eugene Kuleshov
 */
public class AnnotationRemapper extends AnnotationVisitor {

  /**
   * The descriptor of the visited annotation. May be {@literal null}, for instance for
   * AnnotationDefault.
   */
  protected final String descriptor;

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

  /**
   * Constructs a new {@link AnnotationRemapper}. <i>Subclasses must not use this constructor</i>.
   * Instead, they must use the {@link #AnnotationRemapper(int,AnnotationVisitor,Remapper)} version.
   *
   * @param annotationVisitor the annotation visitor this remapper must delegate to.
   * @param remapper the remapper to use to remap the types in the visited annotation.
   * @deprecated use {@link #AnnotationRemapper(String, AnnotationVisitor, Remapper)} instead.
   */
  @Deprecated
  public AnnotationRemapper(final AnnotationVisitor annotationVisitor, final Remapper remapper) {
    this(/* descriptor = */ null, annotationVisitor, remapper);
  }

  /**
   * Constructs a new {@link AnnotationRemapper}. <i>Subclasses must not use this constructor</i>.
   * Instead, they must use the {@link #AnnotationRemapper(int,String,AnnotationVisitor,Remapper)}
   * version.
   *
   * @param descriptor the descriptor of the visited annotation. May be {@literal null}.
   * @param annotationVisitor the annotation visitor this remapper must delegate to.
   * @param remapper the remapper to use to remap the types in the visited annotation.
   */
  public AnnotationRemapper(
      final String descriptor, final AnnotationVisitor annotationVisitor, final Remapper remapper) {
    this(/* latest api = */ Opcodes.ASM9, descriptor, annotationVisitor, remapper);
  }

  /**
   * Constructs a new {@link AnnotationRemapper}.
   *
   * @param api the ASM API version supported by this remapper. Must be one of {@link
   *     org.apache.tapestry5.internal.plastic.asm.Opcodes#ASM4}, {@link org.apache.tapestry5.internal.plastic.asm.Opcodes#ASM5}, {@link
   *     org.apache.tapestry5.internal.plastic.asm.Opcodes#ASM6}, {@link org.apache.tapestry5.internal.plastic.asm.Opcodes#ASM7}, {@link
   *     org.apache.tapestry5.internal.plastic.asm.Opcodes#ASM8} or {@link org.apache.tapestry5.internal.plastic.asm.Opcodes#ASM9}.
   * @param annotationVisitor the annotation visitor this remapper must delegate to.
   * @param remapper the remapper to use to remap the types in the visited annotation.
   * @deprecated use {@link #AnnotationRemapper(int, String, AnnotationVisitor, Remapper)} instead.
   */
  @Deprecated
  protected AnnotationRemapper(
      final int api, final AnnotationVisitor annotationVisitor, final Remapper remapper) {
    this(api, /* descriptor = */ null, annotationVisitor, remapper);
  }

  /**
   * Constructs a new {@link AnnotationRemapper}.
   *
   * @param api the ASM API version supported by this remapper. Must be one of {@link
   *     org.apache.tapestry5.internal.plastic.asm.Opcodes#ASM4}, {@link org.apache.tapestry5.internal.plastic.asm.Opcodes#ASM5}, {@link
   *     org.apache.tapestry5.internal.plastic.asm.Opcodes#ASM6}, {@link org.apache.tapestry5.internal.plastic.asm.Opcodes#ASM7}, {@link
   *     org.apache.tapestry5.internal.plastic.asm.Opcodes#ASM8} or {@link org.apache.tapestry5.internal.plastic.asm.Opcodes#ASM9}.
   * @param descriptor the descriptor of the visited annotation. May be {@literal null}.
   * @param annotationVisitor the annotation visitor this remapper must delegate to.
   * @param remapper the remapper to use to remap the types in the visited annotation.
   */
  protected AnnotationRemapper(
      final int api,
      final String descriptor,
      final AnnotationVisitor annotationVisitor,
      final Remapper remapper) {
    super(api, annotationVisitor);
    this.descriptor = descriptor;
    this.remapper = remapper;
  }

  @Override
  public void visit(final String name, final Object value) {
    super.visit(mapAnnotationAttributeName(name), remapper.mapValue(value));
  }

  @Override
  public void visitEnum(final String name, final String descriptor, final String value) {
    super.visitEnum(mapAnnotationAttributeName(name), remapper.mapDesc(descriptor), value);
  }

  @Override
  public AnnotationVisitor visitAnnotation(final String name, final String descriptor) {
    AnnotationVisitor annotationVisitor =
        super.visitAnnotation(mapAnnotationAttributeName(name), remapper.mapDesc(descriptor));
    if (annotationVisitor == null) {
      return null;
    } else {
      return annotationVisitor == av
          ? this
          : createAnnotationRemapper(descriptor, annotationVisitor);
    }
  }

  @Override
  public AnnotationVisitor visitArray(final String name) {
    AnnotationVisitor annotationVisitor = super.visitArray(mapAnnotationAttributeName(name));
    if (annotationVisitor == null) {
      return null;
    } else {
      return annotationVisitor == av
          ? this
          : createAnnotationRemapper(/* descriptor = */ null, annotationVisitor);
    }
  }

  /**
   * 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.
   * @deprecated use {@link #createAnnotationRemapper(String, AnnotationVisitor)} instead.
   */
  @Deprecated
  protected AnnotationVisitor createAnnotationRemapper(final AnnotationVisitor annotationVisitor) {
    return new AnnotationRemapper(api, /* descriptor = */ null, annotationVisitor, remapper);
  }

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

  /**
   * Returns either this object, or the given one. If the given object is equal to the object
   * returned by the default implementation of the deprecated createAnnotationRemapper method,
   * meaning that this method has not been overridden (or only in minor ways, for instance to add
   * logging), then we can return this object instead, supposed to have been created by the new
   * createAnnotationRemapper method. Otherwise we must return the given object.
   *
   * @param deprecatedAnnotationVisitor the result of a call to the deprecated
   *     createAnnotationRemapper method.
   * @return either this object, or the given one.
   */
  final AnnotationVisitor orDeprecatedValue(final AnnotationVisitor deprecatedAnnotationVisitor) {
    if (deprecatedAnnotationVisitor.getClass() == getClass()) {
      AnnotationRemapper deprecatedAnnotationRemapper =
          (AnnotationRemapper) deprecatedAnnotationVisitor;
      if (deprecatedAnnotationRemapper.api == api
          && deprecatedAnnotationRemapper.av == av
          && deprecatedAnnotationRemapper.remapper == remapper) {
        return this;
      }
    }
    return deprecatedAnnotationVisitor;
  }

  /**
   * Maps an annotation attribute name with the remapper. Returns the original name unchanged if the
   * internal name of the annotation is {@literal null}.
   *
   * @param name the name of the annotation attribute.
   * @return the new name of the annotation attribute.
   */
  private String mapAnnotationAttributeName(final String name) {
    if (descriptor == null) {
      return name;
    }
    return remapper.mapAnnotationAttributeName(descriptor, name);
  }
}
