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.lang.common.util;
  
  import static org.apache.asterix.lang.common.statement.CreateFullTextConfigStatement.FIELD_NAME_FILTER_PIPELINE;
  import static org.apache.asterix.lang.common.statement.CreateFullTextConfigStatement.FIELD_NAME_TOKENIZER;
  
  import org.apache.asterix.common.exceptions.CompilationException;
  import org.apache.asterix.lang.common.expression.RecordConstructor;
  import org.apache.asterix.object.base.AdmObjectNode;
  import org.apache.asterix.om.types.AOrderedListType;
  import org.apache.asterix.om.types.ARecordType;
  import org.apache.asterix.om.types.BuiltinType;
  import org.apache.asterix.om.types.IAType;
  
  public class FullTextUtil {
  
      private FullTextUtil() {
      }
  
      //--------------------------------------- Full-text config --------------------------------------//
  
      // Example of full-text config create statement
      // CREATE FULLTEXT CONFIG my_second_stopword_config IF NOT EXISTS AS {
      //     "Tokenizer": "Word", // built-in tokenizers: "Word" or "NGram"
      //     "FilterPipeline": ["my_second_stopword_filter"]
      // };
      private static ARecordType getFullTextConfigRecordType() {
          final String[] fieldNames = { FIELD_NAME_TOKENIZER, FIELD_NAME_FILTER_PIPELINE };
          final IAType[] fieldTypes = { BuiltinType.ASTRING, new AOrderedListType(BuiltinType.ASTRING, null) };
          return new ARecordType("fullTextConfigRecordType", fieldNames, fieldTypes, true);
      }
  
      private static final ARecordType FULL_TEXT_CONFIG_RECORD_TYPE = getFullTextConfigRecordType();
  
      public static AdmObjectNode validateAndGetConfigNode(RecordConstructor recordConstructor)
              throws CompilationException {
          final ConfigurationTypeValidator validator = new ConfigurationTypeValidator();
          final AdmObjectNode node = ExpressionUtils.toNode(recordConstructor);
          validator.validateType(FULL_TEXT_CONFIG_RECORD_TYPE, node);
          return node;
      }
  
      //--------------------------------------- Full-text filter --------------------------------------//
  
      // Example of full-text filter create statement
      // Note that only the type field is a must, and other fields is filter-type-specific
      //
      // CREATE FULLTEXT FILTER my_stopword_filter IF NOT EXISTS AS {
      //     "Type": "stopwords",
      //     "StopwordsList": ["xxx", "yyy", "zzz"]
      // };
  
      public static AdmObjectNode getFilterNode(RecordConstructor recordConstructor) throws CompilationException {
          // Skip validation here because the current validator only supports CLOSED record validate
          // while the FULL_TEXT_FILTER_RECORD_TYPE is open and specific to the filter types,
          // e.g. stopwords filter and stemmer filter may have different fields
          final AdmObjectNode node = ExpressionUtils.toNode(recordConstructor);
          return node;
      }
  }
  