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.asterix.runtime.evaluators.functions;
  
  import java.util.Arrays;
  import java.util.regex.Pattern;
  
  import org.apache.hyracks.data.std.primitive.UTF8StringPointable;
  import org.apache.hyracks.data.std.util.ByteArrayAccessibleOutputStream;
  
  public final class StringEvaluatorUtils {
  
      private StringEvaluatorUtils() {
      }
  
      public static int toFlag(String pattern) {
          int flag = 0;
          for (int i = 0; i < pattern.length(); i++) {
              char c = pattern.charAt(i);
              switch (c) {
                  case 's':
                      flag |= Pattern.DOTALL;
                      break;
                  case 'm':
                      flag |= Pattern.MULTILINE;
                      break;
                  case 'i':
                      flag |= Pattern.CASE_INSENSITIVE;
                      break;
                  case 'x':
                      flag |= Pattern.COMMENTS;
                      break;
              }
          }
          return flag;
      }
  
      public static UTF8StringPointable copyResetUTF8Pointable(UTF8StringPointable srcString,
              ByteArrayAccessibleOutputStream destCopyStorage, UTF8StringPointable destString) {
          destCopyStorage.reset();
          destCopyStorage.write(srcString.getByteArray(), srcString.getStartOffset(),
                  srcString.getMetaDataLength() + srcString.getUTF8Length());
          destString.set(destCopyStorage.getByteArray(), 0, destCopyStorage.size());
          return destString;
      }
  
      public static final char[] RESERVED_REGEX_CHARS = new char[] { '\\', '(', ')', '[', ']', '{', '}', '.', '^', '$',
              '*', '|', '+', '?', '<', '>', '-', '=', '!' };
  
      static {
          Arrays.sort(RESERVED_REGEX_CHARS);
      }
  }
  