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

import java.util.List;
import scala.tools.asm.Label;
import scala.tools.asm.MethodVisitor;
import scala.tools.asm.Opcodes;
import scala.tools.asm.TypePath;

/**
 * A node that represents a type annotation on a local or resource variable.
 *
 * @author Eric Bruneton
 */
public class LocalVariableAnnotationNode extends TypeAnnotationNode {

  /**
   * The fist instructions corresponding to the continuous ranges that make the scope of this local
   * variable (inclusive). Must not be {@literal null}.
   */
  public List<LabelNode> start;

  /**
   * The last instructions corresponding to the continuous ranges that make the scope of this local
   * variable (exclusive). This list must have the same size as the 'start' list. Must not be
   * {@literal null}.
   */
  public List<LabelNode> end;

  /**
   * The local variable's index in each range. This list must have the same size as the 'start'
   * list. Must not be {@literal null}.
   */
  public List<Integer> index;

  /**
   * Constructs a new {@link LocalVariableAnnotationNode}. <i>Subclasses must not use this
   * constructor</i>. Instead, they must use the {@link #LocalVariableAnnotationNode(int, TypePath,
   * LabelNode[], LabelNode[], int[], String)} version.
   *
   * @param typeRef a reference to the annotated type. See {@link scala.tools.asm.TypeReference}.
   * @param typePath the path to the annotated type argument, wildcard bound, array element type, or
   *     static inner type within 'typeRef'. May be {@literal null} if the annotation targets
   *     'typeRef' as a whole.
   * @param start the fist instructions corresponding to the continuous ranges that make the scope
   *     of this local variable (inclusive).
   * @param end the last instructions corresponding to the continuous ranges that make the scope of
   *     this local variable (exclusive). This array must have the same size as the 'start' array.
   * @param index the local variable's index in each range. This array must have the same size as
   *     the 'start' array.
   * @param descriptor the class descriptor of the annotation class.
   */
  public LocalVariableAnnotationNode(
      final int typeRef,
      final TypePath typePath,
      final LabelNode[] start,
      final LabelNode[] end,
      final int[] index,
      final String descriptor) {
    this(/* latest api = */ Opcodes.ASM9, typeRef, typePath, start, end, index, descriptor);
  }

  /**
   * Constructs a new {@link LocalVariableAnnotationNode}.
   *
   * @param api the ASM API version implemented by this visitor. Must be one of the {@code
   *     ASM}<i>x</i> values in {@link Opcodes}.
   * @param typeRef a reference to the annotated type. See {@link scala.tools.asm.TypeReference}.
   * @param start the fist instructions corresponding to the continuous ranges that make the scope
   *     of this local variable (inclusive).
   * @param end the last instructions corresponding to the continuous ranges that make the scope of
   *     this local variable (exclusive). This array must have the same size as the 'start' array.
   * @param index the local variable's index in each range. This array must have the same size as
   *     the 'start' array.
   * @param typePath the path to the annotated type argument, wildcard bound, array element type, or
   *     static inner type within 'typeRef'. May be {@literal null} if the annotation targets
   *     'typeRef' as a whole.
   * @param descriptor the class descriptor of the annotation class.
   */
  public LocalVariableAnnotationNode(
      final int api,
      final int typeRef,
      final TypePath typePath,
      final LabelNode[] start,
      final LabelNode[] end,
      final int[] index,
      final String descriptor) {
    super(api, typeRef, typePath, descriptor);
    this.start = Util.asArrayList(start);
    this.end = Util.asArrayList(end);
    this.index = Util.asArrayList(index);
  }

  /**
   * Makes the given visitor visit this type annotation.
   *
   * @param methodVisitor the visitor that must visit this annotation.
   * @param visible {@literal true} if the annotation is visible at runtime.
   */
  public void accept(final MethodVisitor methodVisitor, final boolean visible) {
    Label[] startLabels = new Label[this.start.size()];
    Label[] endLabels = new Label[this.end.size()];
    int[] indices = new int[this.index.size()];
    for (int i = 0, n = startLabels.length; i < n; ++i) {
      startLabels[i] = this.start.get(i).getLabel();
      endLabels[i] = this.end.get(i).getLabel();
      indices[i] = this.index.get(i);
    }
    accept(
        methodVisitor.visitLocalVariableAnnotation(
            typeRef, typePath, startLabels, endLabels, indices, desc, visible));
  }
}
