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/* Qilin - a Java Pointer Analysis Framework
 * Copyright (C) 2021-2030 Qilin developers
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation, either version 3.0 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Lesser Public License for more details.
 *
 * You should have received a copy of the GNU General Lesser Public
 * License along with this program.  If not, see
 * .
 */

package qilin.core.pag;

import java.util.Objects;
import qilin.core.PointsToAnalysis;
import sootup.core.model.SootMethod;

/**
 * Represents a method parameter.
 *
 * @author Ondrej Lhotak
 */
public class Parm {
  private final int index;
  private final SootMethod method;

  public Parm(SootMethod m, int i) {
    index = i;
    method = m;
  }

  public String toString() {
    if (index == PointsToAnalysis.THIS_NODE) {
      return "Parm THIS_NODE to " + method;
    } else if (index == PointsToAnalysis.RETURN_NODE) {
      return "Parm RETURN to " + method;
    } else {
      return "Parm " + index + " to " + method;
    }
  }

  public int getIndex() {
    return index;
  }

  public boolean isThis() {
    return index == PointsToAnalysis.THIS_NODE;
  }

  public boolean isReturn() {
    return index == PointsToAnalysis.RETURN_NODE;
  }

  public boolean isThrowRet() {
    return index == PointsToAnalysis.THROW_NODE;
  }

  public SootMethod method() {
    return method;
  }

  @Override
  public boolean equals(Object o) {
    if (this == o) return true;
    if (o == null || getClass() != o.getClass()) return false;
    Parm parm = (Parm) o;
    return index == parm.index && method.equals(parm.method);
  }

  @Override
  public int hashCode() {
    return Objects.hash(index, method);
  }
}