/**
    * 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.pattern;
  
  import ch.qos.logback.classic.spi.IThrowableProxy;
  import ch.qos.logback.classic.spi.StackTraceElementProxy;
  import ch.qos.logback.classic.spi.ThrowableProxyUtil;
  import ch.qos.logback.core.CoreConstants;
  
  /**
   * @author Tomasz Nurkiewicz
   * @since 0.9.30
   */
  public class RootCauseFirstThrowableProxyConverter extends ExtendedThrowableProxyConverter {
  
    @Override
    protected String throwableProxyToString(IThrowableProxy tp) {
      StringBuilder buf = new StringBuilder(2048);
      subjoinRootCauseFirst(tp, buf);
      return buf.toString();
    }
  
    private void subjoinRootCauseFirst(IThrowableProxy tp, StringBuilder buf) {
      if (tp.getCause() != null)
        subjoinRootCauseFirst(tp.getCause(), buf);
      subjoinRootCause(tp, buf);
    }
  
    private void subjoinRootCause(IThrowableProxy tp, StringBuilder buf) {
      ThrowableProxyUtil.subjoinFirstLineRootCauseFirst(buf, tp);
      buf.append(CoreConstants.LINE_SEPARATOR);
      StackTraceElementProxy[] stepArray = tp.getStackTraceElementProxyArray();
      int commonFrames = tp.getCommonFrames();
  
      boolean unrestrictedPrinting = lengthOption > stepArray.length;
  
  
      int maxIndex = (unrestrictedPrinting) ? stepArray.length : lengthOption;
      if (commonFrames > 0 && unrestrictedPrinting) {
        maxIndex -= commonFrames;
      }
  
      for (int i = 0; i < maxIndex; i++) {
        String string = stepArray[i].toString();
        buf.append(CoreConstants.TAB);
        buf.append(string);
        extraData(buf, stepArray[i]); // allow other data to be added
        buf.append(CoreConstants.LINE_SEPARATOR);
      }
  
    }
  
  
  }