package org.checkerframework.dataflow.cfg.node;

import com.sun.source.tree.ArrayTypeTree;
import com.sun.source.tree.Tree;
import java.util.Collection;
import java.util.Collections;
import java.util.Objects;
import javax.lang.model.util.Types;
import org.checkerframework.checker.nullness.qual.Nullable;
import org.checkerframework.dataflow.qual.SideEffectFree;
import org.checkerframework.javacutil.TreeUtils;

/**
 * A node representing an array type used in an expression such as a field access.
 *
 * <p><em>type</em> .class
 */
public class ArrayTypeNode extends Node {

  protected final ArrayTypeTree tree;

  /** For Types.isSameType. */
  protected final Types types;

  public ArrayTypeNode(ArrayTypeTree tree, Types types) {
    super(TreeUtils.typeOf(tree));
    this.tree = tree;
    this.types = types;
  }

  @Override
  public Tree getTree() {
    return tree;
  }

  @Override
  public <R, P> R accept(NodeVisitor<R, P> visitor, P p) {
    return visitor.visitArrayType(this, p);
  }

  @Override
  public String toString() {
    return tree.toString();
  }

  @Override
  public boolean equals(@Nullable Object obj) {
    if (!(obj instanceof ArrayTypeNode)) {
      return false;
    }
    ArrayTypeNode other = (ArrayTypeNode) obj;
    return types.isSameType(getType(), other.getType());
  }

  @Override
  public int hashCode() {
    return Objects.hash(getType());
  }

  @Override
  @SideEffectFree
  public Collection<Node> getOperands() {
    return Collections.emptyList();
  }
}
