/**
    * Logback: the reliable, generic, fast and flexible logging framework.
    * Copyright (C) 1999-2011, QOS.ch. All rights reserved.
    *
    * This program and the accompanying materials are dual-licensed under
    * either the terms of the Eclipse Public License v1.0 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 java.io.Serializable;
  
  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;
    private ClassPackagingData cpd;
  
    public StackTraceElementProxy(StackTraceElement ste) {
      if (ste == null) {
        throw new IllegalArgumentException("ste cannot be null");
      }
      this.ste = ste;
    }
  
    
    public String getSTEAsString() {
      if (steAsString == null) {
        steAsString = "at " + ste.toString();
      }
      return steAsString;
    }
    
    public StackTraceElement getStackTraceElement() {
      return ste;
    }
    
    public void setClassPackagingData(ClassPackagingData cpd) {
      if(this.cpd != null) {
        throw new IllegalStateException("Packaging data has been already set");
      }
      this.cpd = cpd;
    }
  
    public ClassPackagingData getClassPackagingData() {
      return cpd;
    }
  
    @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 (cpd == null) {
        if (other.cpd != null) {
          return false;
        }
      } else if (!cpd.equals(other.cpd)) {
        return false;
      }
      return true;
    }
  
    @Override
    public String toString() {
      return getSTEAsString();
    }
  }