plastic/src/external/java/org/apache/tapestry5/internal/plastic/asm/commons/FieldRemapper.java

// 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.FieldVisitor;
import org.apache.tapestry5.internal.plastic.asm.Opcodes;
import org.apache.tapestry5.internal.plastic.asm.TypePath;

/**
 * A {@link FieldVisitor} that remaps types with a {@link Remapper}.
 *
 * @author Eugene Kuleshov
 */
public class FieldRemapper extends FieldVisitor {

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

  /**
   * Constructs a new {@link FieldRemapper}. <i>Subclasses must not use this constructor</i>.
   * Instead, they must use the {@link #FieldRemapper(int,FieldVisitor,Remapper)} version.
   *
   * @param fieldVisitor the field visitor this remapper must deleted to.
   * @param remapper the remapper to use to remap the types in the visited field.
   */
  public FieldRemapper(final FieldVisitor fieldVisitor, final Remapper remapper) {
    this(/* latest api = */ Opcodes.ASM8, fieldVisitor, remapper);
  }

  /**
   * Constructs a new {@link FieldRemapper}.
   *
   * @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 Opcodes#ASM7} or {@link Opcodes#ASM8}.
   * @param fieldVisitor the field visitor this remapper must deleted to.
   * @param remapper the remapper to use to remap the types in the visited field.
   */
  protected FieldRemapper(final int api, final FieldVisitor fieldVisitor, final Remapper remapper) {
    super(api, fieldVisitor);
    this.remapper = remapper;
  }

  @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);
  }

  /**
   * 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);
  }
}