plastic/src/external/java/org/apache/tapestry5/internal/plastic/asm/util/TraceAnnotationVisitor.java

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

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

/**
 * An {@link AnnotationVisitor} that prints the annotations it visits with a {@link Printer}.
 *
 * @author Eric Bruneton
 */
public final class TraceAnnotationVisitor extends AnnotationVisitor {

  /** The printer to convert the visited annotation into text. */
  private final Printer printer;

  /**
   * Constructs a new {@link TraceAnnotationVisitor}.
   *
   * @param printer the printer to convert the visited annotation into text.
   */
  public TraceAnnotationVisitor(final Printer printer) {
    this(null, printer);
  }

  /**
   * Constructs a new {@link TraceAnnotationVisitor}.
   *
   * @param annotationVisitor the annotation visitor to which to delegate calls. May be {@literal
   *     null}.
   * @param printer the printer to convert the visited annotation into text.
   */
  public TraceAnnotationVisitor(final AnnotationVisitor annotationVisitor, final Printer printer) {
    super(/* latest api = */ Opcodes.ASM8, annotationVisitor);
    this.printer = printer;
  }

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

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

  @Override
  public AnnotationVisitor visitAnnotation(final String name, final String descriptor) {
    Printer annotationPrinter = printer.visitAnnotation(name, descriptor);
    return new TraceAnnotationVisitor(super.visitAnnotation(name, descriptor), annotationPrinter);
  }

  @Override
  public AnnotationVisitor visitArray(final String name) {
    Printer arrayPrinter = printer.visitArray(name);
    return new TraceAnnotationVisitor(super.visitArray(name), arrayPrinter);
  }

  @Override
  public void visitEnd() {
    printer.visitAnnotationEnd();
    super.visitEnd();
  }
}