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.calcite.adapter.redis;
  
  import org.apache.calcite.DataContext;
  import org.apache.calcite.linq4j.AbstractEnumerable;
  import org.apache.calcite.linq4j.Enumerable;
  import org.apache.calcite.linq4j.Enumerator;
  import org.apache.calcite.rel.type.RelDataType;
  import org.apache.calcite.rel.type.RelDataTypeFactory;
  import org.apache.calcite.rel.type.RelProtoDataType;
  import org.apache.calcite.schema.ScannableTable;
  import org.apache.calcite.schema.Table;
  import org.apache.calcite.schema.impl.AbstractTable;
  import org.apache.calcite.util.Pair;
  
  import com.google.common.collect.ImmutableMap;
  
  import org.checkerframework.checker.nullness.qual.Nullable;
  
  import java.util.ArrayList;
  import java.util.List;
  import java.util.Map;
  
  /**
   * Table mapped onto a redis table.
   */
  public class RedisTable extends AbstractTable
      implements ScannableTable {
  
    final RedisSchema schema;
    final String tableName;
    final RelProtoDataType protoRowType;
    final ImmutableMap<String, Object> allFields;
    final String dataFormat;
    final RedisConfig redisConfig;
    RedisEnumerator redisEnumerator;
  
    public RedisTable(
        RedisSchema schema,
        String tableName,
        RelProtoDataType protoRowType,
        Map<String, Object> allFields,
        String dataFormat,
        RedisConfig redisConfig) {
      this.schema = schema;
      this.tableName = tableName;
      this.protoRowType = protoRowType;
      this.allFields =
          allFields == null ? ImmutableMap.of()
              : ImmutableMap.copyOf(allFields);
      this.dataFormat = dataFormat;
      this.redisConfig = redisConfig;
    }
  
    @Override public RelDataType getRowType(RelDataTypeFactory typeFactory) {
      if (protoRowType != null) {
        return protoRowType.apply(typeFactory);
      }
      final List<RelDataType> types = new ArrayList<RelDataType>(allFields.size());
      final List<String> names = new ArrayList<String>(allFields.size());
  
      for (Object key : allFields.keySet()) {
        final RelDataType type = typeFactory.createJavaType(allFields.get(key).getClass());
        names.add(key.toString());
        types.add(type);
      }
      return typeFactory.createStructType(Pair.zip(names, types));
    }
  
    static Table create(
        RedisSchema schema,
        String tableName,
        RedisConfig redisConfig,
        RelProtoDataType protoRowType) {
      RedisTableFieldInfo tableFieldInfo = schema.getTableFieldInfo(tableName);
      Map<String, Object> allFields = RedisEnumerator.deduceRowType(tableFieldInfo);
      return new RedisTable(schema, tableName, protoRowType,
          allFields, tableFieldInfo.getDataFormat(), redisConfig);
    }
  
    static Table create(
        RedisSchema schema,
        String tableName,
        Map operand,
        RelProtoDataType protoRowType) {
      RedisConfig redisConfig =
          new RedisConfig(schema.host, schema.port,
              schema.database, schema.password);
      return create(schema, tableName, redisConfig, protoRowType);
    }
  
    @Override public Enumerable<@Nullable Object[]> scan(DataContext root) {
      return new AbstractEnumerable<Object[]>() {
        @Override public Enumerator<Object[]> enumerator() {
          return new RedisEnumerator(redisConfig, schema, tableName);
        }
      };
    }
  }
  