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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.
   */
  package org.apache.asterix.optimizer.rules.util;
  
  import java.util.List;
  
  import org.apache.asterix.om.functions.BuiltinFunctions;
  import org.apache.asterix.om.utils.ConstantExpressionUtil;
  import org.apache.asterix.optimizer.rules.am.IOptimizableFuncExpr;
  import org.apache.asterix.optimizer.rules.am.InvertedIndexAccessMethod;
  import org.apache.asterix.runtime.evaluators.functions.FullTextContainsFunctionDescriptor;
  import org.apache.commons.lang3.mutable.Mutable;
  import org.apache.hyracks.algebricks.core.algebra.base.ILogicalExpression;
  import org.apache.hyracks.algebricks.core.algebra.expressions.AbstractFunctionCallExpression;
  import org.apache.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
  
  public class FullTextUtil {
  
      public static boolean isFullTextContainsFunctionExpr(IOptimizableFuncExpr expr) {
          return isFullTextContainsFunctionExpr(expr.getFuncExpr());
      }
  
      public static boolean isFullTextContainsFunctionExpr(AbstractFunctionCallExpression expr) {
          FunctionIdentifier funcId = expr.getFunctionIdentifier();
          if (funcId.equals(BuiltinFunctions.FULLTEXT_CONTAINS)
                  || funcId.equals(BuiltinFunctions.FULLTEXT_CONTAINS_WO_OPTION)) {
              return true;
          }
          return false;
      }
  
      // If not a full-text function expression, then return null
      // Otherwise, return the full-text config if one exists in the expression, otherwise return the default config
      public static String getFullTextConfigNameFromExpr(IOptimizableFuncExpr expr) {
          return getFullTextConfigNameFromExpr(expr.getFuncExpr());
      }
  
      // ToDo: here we are parsing the expr manually, maybe we can find a better way to parse the arguments,
      //  e.g. convert the argument into an AdmObjectNode and then read from the object node
      public static String getFullTextConfigNameFromExpr(AbstractFunctionCallExpression funcExpr) {
          if (isFullTextContainsFunctionExpr(funcExpr) == false) {
              return null;
          }
  
          String configName = null;
          List<Mutable<ILogicalExpression>> arguments = funcExpr.getArguments();
  
          // The first two arguments are
          // 1) the full-text record field to be queried,
          // 2) the query keyword array
          // The next fields are the list of full-text search options,
          // say, the next 4 fields can be "mode", "all", "config", "my_full_text_config"
          // Originally, the full-text search option is an Asterix record such as
          //     {"mode": "all", "config": "my_full_text_config"}
          for (int i = 2; i < arguments.size(); i += 2) {
              // The the full-text search option arguments are already checked in FullTextContainsParameterCheckAndSetRule,
              String optionName = ConstantExpressionUtil.getStringConstant(arguments.get(i).getValue());
  
              if (optionName.equalsIgnoreCase(FullTextContainsFunctionDescriptor.FULLTEXT_CONFIG_OPTION)) {
                  configName = ConstantExpressionUtil.getStringConstant(arguments.get(i + 1).getValue());
                  break;
              }
          }
  
          return configName;
      }
  
      public static InvertedIndexAccessMethod.SearchModifierType getFullTextSearchModeFromExpr(
              AbstractFunctionCallExpression funcExpr) {
  
          // After the third argument, the following arguments are full-text search options.
          for (int i = 2; i < funcExpr.getArguments().size(); i = i + 2) {
              String optionName = ConstantExpressionUtil.getStringArgument(funcExpr, i);
  
              if (optionName.equals(FullTextContainsFunctionDescriptor.SEARCH_MODE_OPTION)) {
                  String searchType = ConstantExpressionUtil.getStringArgument(funcExpr, i + 1);
  
                  if (searchType.equals(FullTextContainsFunctionDescriptor.SearchMode.ALL.getValue())) {
                      return InvertedIndexAccessMethod.SearchModifierType.CONJUNCTIVE;
                  } else {
                      return InvertedIndexAccessMethod.SearchModifierType.DISJUNCTIVE;
                  }
              }
          }
  
          // Use CONJUNCTIVE by default
          return InvertedIndexAccessMethod.SearchModifierType.CONJUNCTIVE;
      }
  
  }
  