/*
    * Logback: the reliable, generic, fast and flexible logging framework.
    * Copyright (C) 1999-2026, QOS.ch. All rights reserved.
    *
    * This program and the accompanying materials are dual-licensed under
    * either the terms of the Eclipse Public License v2.0 as published by
    * the Eclipse Foundation
    *
    *   or (per the licensee's choosing)
   *
   * under the terms of the GNU Lesser General Public License version 2.1
   * as published by the Free Software Foundation.
   */
  package ch.qos.logback.classic.spi;
  
  import ch.qos.logback.classic.ClassicConstants;
  import ch.qos.logback.core.CoreConstants;
  
  import java.io.Serializable;
  import java.util.Objects;
  
  import static ch.qos.logback.classic.ClassicConstants.DECLARING_CLASS_NA;
  import static ch.qos.logback.classic.ClassicConstants.FILENAME_NA;
  import static ch.qos.logback.classic.ClassicConstants.LINE_NUMBER_NA;
  import static ch.qos.logback.classic.ClassicConstants.METHOD_NAME_NA;
  
  public class StackTraceElementProxy implements Serializable {
  
      private static final long serialVersionUID = -2374374378980555982L;
  
      final StackTraceElement ste;
      // save a byte or two during serialization, as we can
      // reconstruct this field from 'ste'
      transient private String steAsString;
  
      @Deprecated
      ClassPackagingData classPackagingData;
  
      // See https://github.com/qos-ch/logback/issues/1040
      static final StackTraceElement NA_SUBSTITUTE = new StackTraceElement(DECLARING_CLASS_NA, METHOD_NAME_NA,
                                                                          FILENAME_NA, LINE_NUMBER_NA);
  
      public StackTraceElementProxy(StackTraceElement ste) {
          // while null StackTraceElement is not expected, we defensively replace it with NA_SUBSTITUTE.
          this.ste = Objects.requireNonNullElse(ste, NA_SUBSTITUTE);
      }
  
      public String getSTEAsString() {
          if (steAsString == null) {
              steAsString = "at " + ste.toString();
          }
          return steAsString;
      }
  
      public StackTraceElement getStackTraceElement() {
          return ste;
      }
  
      public void setClassPackagingData(ClassPackagingData cpd) {
          if (this.classPackagingData != null) {
              throw new IllegalStateException("Packaging data has been already set");
          }
          this.classPackagingData = cpd;
      }
  
      public ClassPackagingData getClassPackagingData() {
          return classPackagingData;
      }
  
      @Override
      public int hashCode() {
          return ste.hashCode();
      }
  
      @Override
      public boolean equals(Object obj) {
          if (this == obj)
              return true;
          if (obj == null)
              return false;
          if (getClass() != obj.getClass())
              return false;
          final StackTraceElementProxy other = (StackTraceElementProxy) obj;
  
          if (!ste.equals(other.ste)) {
              return false;
          }
          if (classPackagingData == null) {
              if (other.classPackagingData != null) {
                  return false;
              }
          } else if (!classPackagingData.equals(other.classPackagingData)) {
              return false;
          }
          return true;
      }
  
      @Override
      public String toString() {
         return getSTEAsString();
     }
 }