package org.checkerframework.dataflow.livevariable;

import org.checkerframework.checker.nullness.qual.Nullable;
import org.checkerframework.dataflow.analysis.AbstractValue;
import org.checkerframework.dataflow.cfg.node.Node;
import org.checkerframework.javacutil.BugInCF;

/** A live variable (which is represented by a node) wrapper turning node into abstract value. */
public class LiveVarValue implements AbstractValue<LiveVarValue> {

  /**
   * A live variable is represented by a node, which can be a {@link
   * org.checkerframework.dataflow.cfg.node.LocalVariableNode} or {@link
   * org.checkerframework.dataflow.cfg.node.FieldAccessNode}.
   */
  protected final Node liveVariable;

  @Override
  public LiveVarValue leastUpperBound(LiveVarValue other) {
    throw new BugInCF("lub of LiveVar get called!");
  }

  /**
   * Create a new live variable.
   *
   * @param n a node
   */
  public LiveVarValue(Node n) {
    this.liveVariable = n;
  }

  @Override
  public int hashCode() {
    return this.liveVariable.hashCode();
  }

  @Override
  public boolean equals(@Nullable Object obj) {
    if (!(obj instanceof LiveVarValue)) {
      return false;
    }
    LiveVarValue other = (LiveVarValue) obj;
    return this.liveVariable.equals(other.liveVariable);
  }

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