/*
 * 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/logstring.h>
#include <log4cxx/pattern/formattinginfo.h>
#include <limits.h>

using namespace log4cxx;
using namespace log4cxx::pattern;

IMPLEMENT_LOG4CXX_OBJECT(FormattingInfo)

  /**
   * Creates new instance.
   * @param leftAlign left align if true.
   * @param minLength minimum length.
   * @param maxLength maximum length.
   */
FormattingInfo::FormattingInfo(
    const bool leftAlign1, const int minLength1, const int maxLength1) :
    minLength(minLength1),
    maxLength(maxLength1),
    leftAlign(leftAlign1) {
}

  /**
   * Gets default instance.
   * @return default instance.
   */
FormattingInfoPtr FormattingInfo::getDefault() {
    static FormattingInfoPtr def(new FormattingInfo(false, 0, INT_MAX));
    return def;
}

  /**
   * Adjust the content of the buffer based on the specified lengths and alignment.
   *
   * @param fieldStart start of field in buffer.
   * @param buffer buffer to be modified.
   */
void FormattingInfo::format(const int fieldStart, LogString& buffer) const {
    int rawLength = buffer.length() - fieldStart;

    if (rawLength > maxLength) {
      buffer.erase(buffer.begin() + fieldStart,
                   buffer.begin() + fieldStart + (rawLength - maxLength));
    } else if (rawLength < minLength) {
      if (leftAlign) {
        buffer.append(minLength - rawLength, (logchar) 0x20 /* ' ' */);
      } else {
        buffer.insert(fieldStart, minLength - rawLength, 0x20 /* ' ' */);
      }
    }
  }