package org.checkerframework.dataflow.cfg.node;

import com.sun.source.tree.UnaryTree;
import java.util.Collection;
import java.util.Collections;
import org.checkerframework.javacutil.TreeUtils;

/**
 * A node for a postfix or an unary expression.
 *
 * <p>For example:
 *
 * <pre>
 *   <em>operator</em> <em>expressionNode</em>
 *
 *   <em>expressionNode</em> <em>operator</em>
 * </pre>
 */
public abstract class UnaryOperationNode extends Node {

  protected final UnaryTree tree;
  protected final Node operand;

  protected UnaryOperationNode(UnaryTree tree, Node operand) {
    super(TreeUtils.typeOf(tree));
    this.tree = tree;
    this.operand = operand;
  }

  public Node getOperand() {
    return this.operand;
  }

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

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