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1   /**
2    * Logback: the reliable, generic, fast and flexible logging framework.
3    * Copyright (C) 1999-2015, QOS.ch. All rights reserved.
4    *
5    * This program and the accompanying materials are dual-licensed under
6    * either the terms of the Eclipse Public License v1.0 as published by
7    * the Eclipse Foundation
8    *
9    *   or (per the licensee's choosing)
10   *
11   * under the terms of the GNU Lesser General Public License version 2.1
12   * as published by the Free Software Foundation.
13   */
14  package ch.qos.logback.classic.pattern;
15  
16  import ch.qos.logback.classic.spi.IThrowableProxy;
17  import ch.qos.logback.classic.spi.ThrowableProxyUtil;
18  import ch.qos.logback.core.CoreConstants;
19  
20  /**
21   * @author Tomasz Nurkiewicz
22   * @since 0.9.30
23   */
24  public class RootCauseFirstThrowableProxyConverter extends ExtendedThrowableProxyConverter {
25  
26      @Override
27      protected String throwableProxyToString(IThrowableProxy tp) {
28          StringBuilder buf = new StringBuilder(BUILDER_CAPACITY);
29          recursiveAppendRootCauseFirst(buf, null, ThrowableProxyUtil.REGULAR_EXCEPTION_INDENT, tp);
30          return buf.toString();
31      }
32  
33      protected void recursiveAppendRootCauseFirst(StringBuilder sb, String prefix, int indent, IThrowableProxy tp) {
34          if (tp.getCause() != null) {
35              recursiveAppendRootCauseFirst(sb, prefix, indent, tp.getCause());
36              prefix = null; // to avoid adding it more than once
37          }
38          ThrowableProxyUtil.indent(sb, indent - 1);
39          if (prefix != null) {
40              sb.append(prefix);
41          }
42          ThrowableProxyUtil.subjoinFirstLineRootCauseFirst(sb, tp);
43          sb.append(CoreConstants.LINE_SEPARATOR);
44          subjoinSTEPArray(sb, indent, tp);
45          IThrowableProxy[] suppressed = tp.getSuppressed();
46          if (suppressed != null) {
47              for (IThrowableProxy current : suppressed) {
48                  recursiveAppendRootCauseFirst(sb, CoreConstants.SUPPRESSED, indent + ThrowableProxyUtil.SUPPRESSED_EXCEPTION_INDENT, current);
49              }
50          }
51      }
52  }