/src/logging-log4cxx/src/main/cpp/nameabbreviator.cpp

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <log4cxx/pattern/nameabbreviator.h>
#include <log4cxx/helpers/exception.h>
#include <log4cxx/helpers/stringhelper.h>
#include <log4cxx/helpers/loglog.h>
#include <vector>
#include <limits.h>
#include <stdexcept>

using namespace LOG4CXX_NS;
using namespace LOG4CXX_NS::pattern;
using namespace LOG4CXX_NS::helpers;

IMPLEMENT_LOG4CXX_OBJECT(NameAbbreviator)

NameAbbreviator::NameAbbreviator()
{
}

NameAbbreviator::~NameAbbreviator()
{
}

namespace LOG4CXX_NS
{
namespace pattern
{
/**
 * Abbreviator that simply appends full name to buffer.
 */
class NOPAbbreviator : public NameAbbreviator
{
  public:
    DECLARE_ABSTRACT_LOG4CXX_OBJECT(NOPAbbreviator)
    BEGIN_LOG4CXX_CAST_MAP()
    LOG4CXX_CAST_ENTRY(NOPAbbreviator)
    LOG4CXX_CAST_ENTRY_CHAIN(NameAbbreviator)
    END_LOG4CXX_CAST_MAP()

    /**
     * Constructor.
     */
    NOPAbbreviator()
    {
    }

    /**
     * {@inheritDoc}
     */
    void abbreviate(LogString::size_type /* nameStart */, LogString& /* buf */) const override
    {
    }
};


/**
 * Abbreviator that drops starting path elements.
 */
class MaxElementAbbreviator : public NameAbbreviator
{
    /**
     * Maximum number of path elements to output.
     */
    const int count;

  public:
    DECLARE_ABSTRACT_LOG4CXX_OBJECT(MaxElementAbbreviator)
    BEGIN_LOG4CXX_CAST_MAP()
    LOG4CXX_CAST_ENTRY(MaxElementAbbreviator)
    LOG4CXX_CAST_ENTRY_CHAIN(NameAbbreviator)
    END_LOG4CXX_CAST_MAP()
    /**
     * Create new instance.
     * @param count maximum number of path elements to output.
     */
    MaxElementAbbreviator(const int count1) : count(count1)
    {
    }

    /**
     * Abbreviate name.
     * @param buf buffer to append abbreviation.
     * @param nameStart start of name to abbreviate.
     */
    void abbreviate(LogString::size_type nameStart, LogString& buf) const override
    {
      // We substract 1 from 'len' when assigning to 'end' to avoid out of
      // bounds exception in return r.substring(end+1, len). This can happen if
      // precision is 1 and the logger name ends with a dot.
      LogString::size_type end = buf.length() - 1;

      for (LogString::size_type i = count; i > 0; i--)
      {
        end = buf.rfind(0x2E /* '.' */, end - 1);

        if ((end == LogString::npos) || (end < nameStart))
        {
          return;
        }
      }

      buf.erase(buf.begin() + nameStart, buf.begin() + (end + 1));
    }
};

/**
 * Fragment of an pattern abbreviator.
 *
 */
class PatternAbbreviatorFragment
{
    /**
     * Count of initial characters of element to output.
     */
    LogString::size_type charCount;

    /**
     *  Character used to represent dropped characters.
     * '\0' indicates no representation of dropped characters.
     */
    logchar ellipsis;

  public:
    /**
     * Creates a PatternAbbreviatorFragment.
     * @param charCount number of initial characters to preserve.
     * @param ellipsis character to represent elimination of characters,
     *    '\0' if no ellipsis is desired.
     */
    PatternAbbreviatorFragment(
      const int charCount1, const logchar ellipsis1)
      : charCount(charCount1), ellipsis(ellipsis1)
    {
    }
    PatternAbbreviatorFragment() : charCount(0), ellipsis(0)
    {
    }

    PatternAbbreviatorFragment(const PatternAbbreviatorFragment& src)
      : charCount(src.charCount), ellipsis(src.ellipsis)
    {
    }

    PatternAbbreviatorFragment& operator=(const PatternAbbreviatorFragment& src)
    {
      charCount = src.charCount;
      ellipsis = src.ellipsis;
      return *this;
    }

    /**
     * Abbreviate element of name.
     * @param buf buffer to receive element.
     * @param startPos starting index of name element.
     * @return starting index of next element.
     */
    LogString::size_type abbreviate(LogString& buf, LogString::size_type startPos) const
    {
      LogString::size_type nextDot = buf.find(0x2E /* '.' */, startPos);

      if (nextDot != LogString::npos)
      {
        if ((nextDot - startPos) > charCount)
        {
          buf.erase(buf.begin() + (startPos + charCount), buf.begin() + nextDot);
          nextDot = startPos + charCount;

          if (ellipsis != 0x00)
          {
            buf.insert(nextDot, 1, ellipsis);
            nextDot++;
          }
        }

        nextDot++;
      }

      return nextDot;
    }
};

/**
 * Pattern abbreviator.
 *
 *
 */
class PatternAbbreviator : public NameAbbreviator
{
    /**
     * Element abbreviation patterns.
     */
    std::vector<PatternAbbreviatorFragment> fragments;

  public:
    DECLARE_ABSTRACT_LOG4CXX_OBJECT(PatternAbbreviator)
    BEGIN_LOG4CXX_CAST_MAP()
    LOG4CXX_CAST_ENTRY(PatternAbbreviator)
    LOG4CXX_CAST_ENTRY_CHAIN(NameAbbreviator)
    END_LOG4CXX_CAST_MAP()
    /**
     * Create PatternAbbreviator.
     *
     * @param fragments element abbreviation patterns.
     */
    PatternAbbreviator(const std::vector<PatternAbbreviatorFragment>& fragments1) :
      fragments(fragments1)
    {
      if (fragments1.size() == 0)
      {
        throw IllegalArgumentException(LOG4CXX_STR("fragments parameter must contain at least one element"));
      }
    }

    /**
     * Abbreviate name.
     * @param buf buffer that abbreviated name is appended.
     * @param nameStart start of name.
     */
    void abbreviate(LogString::size_type nameStart, LogString& buf) const override
    {
      //
      //  all non-terminal patterns are executed once
      //
      LogString::size_type pos = nameStart;

      for (LogString::size_type i = 0; (i < (fragments.size() - 1)) && (pos < buf.length());
        i++)
      {
        pos = fragments[i].abbreviate(buf, pos);
      }

      //
      //   last pattern in executed repeatedly
      //
      PatternAbbreviatorFragment terminalFragment =
        fragments[fragments.size() - 1];

      while (pos < buf.length())
      {
        pos = terminalFragment.abbreviate(buf, pos);
      }
    }
};
}
}

IMPLEMENT_LOG4CXX_OBJECT(NOPAbbreviator)
IMPLEMENT_LOG4CXX_OBJECT(MaxElementAbbreviator)
IMPLEMENT_LOG4CXX_OBJECT(PatternAbbreviator)



NameAbbreviatorPtr NameAbbreviator::getAbbreviator(const LogString& pattern)
{
  if (pattern.length() > 0)
  {
    //  if pattern is just spaces and numbers then
    //     use MaxElementAbbreviator
    LogString trimmed(StringHelper::trim(pattern));

    if (trimmed.length() == 0)
    {
      return getDefaultAbbreviator();
    }

    LogString::size_type i = 0;

    while (
      (i < trimmed.length()) && (trimmed[i] >= 0x30 /* '0' */)
      && (trimmed[i] <= 0x39 /* '9' */))
    {
      i++;
    }

    //
    //  if all blanks and digits
    //
    if (i == trimmed.length())
    {
      int len = 256;
      try
      {
        len = StringHelper::toInt(trimmed);
      }
      catch (const std::out_of_range& ex)
      {
        LogLog::warn(LOG4CXX_STR("Invalid name abreviator pattern: ") + pattern, ex);
      }

      if(len > 256){
        len = 256;
      }else if( len < 0 ){
        len = 0;
      }

      return std::make_shared<MaxElementAbbreviator>(len);
    }

    std::vector<PatternAbbreviatorFragment> fragments;
    logchar ellipsis;
    int charCount;
    LogString::size_type pos = 0;

    while (pos < trimmed.length())
    {
      LogString::size_type ellipsisPos = pos;

      if (trimmed[pos] == 0x2A /* '*' */)
      {
        charCount = INT_MAX;
        ellipsisPos++;
      }
      else
      {
        if ((trimmed[pos] >= 0x30 /* '0' */)
          && (trimmed[pos] <= 0x39 /* '9' */))
        {
          charCount = trimmed[pos] - 0x30 /* '0' */;
          ellipsisPos++;
        }
        else
        {
          charCount = 0;
        }
      }

      ellipsis = 0;

      if (ellipsisPos < trimmed.length())
      {
        ellipsis = trimmed[ellipsisPos];

        if (ellipsis == 0x2E /* '.' */)
        {
          ellipsis = 0;
        }
      }

      fragments.push_back(PatternAbbreviatorFragment(charCount, ellipsis));
      pos = trimmed.find(0x2E /* '.' */, pos);

      if (pos == LogString::npos)
      {
        break;
      }

      pos++;
    }

    return std::make_shared<PatternAbbreviator>(fragments);
  }

  //
  //  no matching abbreviation, return defaultAbbreviator
  //
  return getDefaultAbbreviator();
}

/**
 * Gets default abbreviator.
 *
 * @return default abbreviator.
 */
NameAbbreviatorPtr NameAbbreviator::getDefaultAbbreviator()
{
  static WideLife<NameAbbreviatorPtr> def = std::make_shared<NOPAbbreviator>();
  return def;
}


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Created: 2025-08-26 06:48