content: /**
   * 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.
   */
  
  package org.apache.hive.service.cli;
  
  import org.apache.log4j.Layout;
  import org.apache.log4j.PatternLayout;
  
  /**
   * CLIServiceUtils.
   *
   */
  public class CLIServiceUtils {
  
  
    private static final char SEARCH_STRING_ESCAPE = '\\';
    public static final Layout verboseLayout = new PatternLayout(
      "%d{yy/MM/dd HH:mm:ss} %p %c{2}: %m%n");
    public static final Layout nonVerboseLayout = new PatternLayout(
      "%-5p : %m%n");
  
    /**
     * Convert a SQL search pattern into an equivalent Java Regex.
     *
     * @param pattern input which may contain '%' or '_' wildcard characters, or
     * these characters escaped using {@link #getSearchStringEscape()}.
     * @return replace %/_ with regex search characters, also handle escaped
     * characters.
     */
    public static String patternToRegex(String pattern) {
      if (pattern == null) {
        return ".*";
      } else {
        StringBuilder result = new StringBuilder(pattern.length());
  
        boolean escaped = false;
        for (int i = 0, len = pattern.length(); i < len; i++) {
          char c = pattern.charAt(i);
          if (escaped) {
            if (c != SEARCH_STRING_ESCAPE) {
              escaped = false;
            }
            result.append(c);
          } else {
            if (c == SEARCH_STRING_ESCAPE) {
              escaped = true;
              continue;
            } else if (c == '%') {
              result.append(".*");
            } else if (c == '_') {
              result.append('.');
            } else {
              result.append(Character.toLowerCase(c));
            }
          }
        }
        return result.toString();
      }
    }
  
  }
  