plastic/src/external/java/org/apache/tapestry5/internal/plastic/asm/tree/TryCatchBlockNode.java

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

import java.util.List;
import org.apache.tapestry5.internal.plastic.asm.MethodVisitor;

/**
 * A node that represents a try catch block.
 *
 * @author Eric Bruneton
 */
public class TryCatchBlockNode {

  /** The beginning of the exception handler's scope (inclusive). */
  public LabelNode start;

  /** The end of the exception handler's scope (exclusive). */
  public LabelNode end;

  /** The beginning of the exception handler's code. */
  public LabelNode handler;

  /**
   * The internal name of the type of exceptions handled by the handler. May be {@literal null} to
   * catch any exceptions (for "finally" blocks).
   */
  public String type;

  /** The runtime visible type annotations on the exception handler type. May be {@literal null}. */
  public List<TypeAnnotationNode> visibleTypeAnnotations;

  /**
   * The runtime invisible type annotations on the exception handler type. May be {@literal null}.
   */
  public List<TypeAnnotationNode> invisibleTypeAnnotations;

  /**
   * Constructs a new {@link TryCatchBlockNode}.
   *
   * @param start the beginning of the exception handler's scope (inclusive).
   * @param end the end of the exception handler's scope (exclusive).
   * @param handler the beginning of the exception handler's code.
   * @param type the internal name of the type of exceptions handled by the handler, or {@literal
   *     null} to catch any exceptions (for "finally" blocks).
   */
  public TryCatchBlockNode(
      final LabelNode start, final LabelNode end, final LabelNode handler, final String type) {
    this.start = start;
    this.end = end;
    this.handler = handler;
    this.type = type;
  }

  /**
   * Updates the index of this try catch block in the method's list of try catch block nodes. This
   * index maybe stored in the 'target' field of the type annotations of this block.
   *
   * @param index the new index of this try catch block in the method's list of try catch block
   *     nodes.
   */
  public void updateIndex(final int index) {
    int newTypeRef = 0x42000000 | (index << 8);
    if (visibleTypeAnnotations != null) {
      for (int i = 0, n = visibleTypeAnnotations.size(); i < n; ++i) {
        visibleTypeAnnotations.get(i).typeRef = newTypeRef;
      }
    }
    if (invisibleTypeAnnotations != null) {
      for (int i = 0, n = invisibleTypeAnnotations.size(); i < n; ++i) {
        invisibleTypeAnnotations.get(i).typeRef = newTypeRef;
      }
    }
  }

  /**
   * Makes the given visitor visit this try catch block.
   *
   * @param methodVisitor a method visitor.
   */
  public void accept(final MethodVisitor methodVisitor) {
    methodVisitor.visitTryCatchBlock(
        start.getLabel(), end.getLabel(), handler == null ? null : handler.getLabel(), type);
    if (visibleTypeAnnotations != null) {
      for (int i = 0, n = visibleTypeAnnotations.size(); i < n; ++i) {
        TypeAnnotationNode typeAnnotation = visibleTypeAnnotations.get(i);
        typeAnnotation.accept(
            methodVisitor.visitTryCatchAnnotation(
                typeAnnotation.typeRef, typeAnnotation.typePath, typeAnnotation.desc, true));
      }
    }
    if (invisibleTypeAnnotations != null) {
      for (int i = 0, n = invisibleTypeAnnotations.size(); i < n; ++i) {
        TypeAnnotationNode typeAnnotation = invisibleTypeAnnotations.get(i);
        typeAnnotation.accept(
            methodVisitor.visitTryCatchAnnotation(
                typeAnnotation.typeRef, typeAnnotation.typePath, typeAnnotation.desc, false));
      }
    }
  }
}