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.hive;
  
  import org.apache.calcite.adapter.enumerable.EnumerableRelImplementor;
  import org.apache.calcite.linq4j.tree.ClassDeclaration;
  import org.apache.calcite.linq4j.tree.DeclarationStatement;
  import org.apache.calcite.linq4j.tree.Expressions;
  import org.apache.calcite.linq4j.tree.MemberDeclaration;
  import org.apache.calcite.linq4j.tree.Statement;
  import org.apache.calcite.rex.RexBuilder;
  
  import com.google.common.collect.ImmutableList;
  
  import java.io.Serializable;
  import java.lang.reflect.Modifier;
  import java.lang.reflect.Type;
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.List;
  import java.util.Map;
  
  /**
   *
   */
  public class HiveEnumerableRelImplementor extends EnumerableRelImplementor {
  
    public HiveEnumerableRelImplementor(
        RexBuilder rexBuilder,
        Map<String, Object> internalParameters) {
      super(rexBuilder, internalParameters);
    }
  
    @Override protected Collection<Statement> buildInitialStatements() {
      List<Statement> initialStatements = new ArrayList<>();
      Type typeOfHiveUdfInstanceHolder = new Type() {
        @Override public String getTypeName() {
          return "HiveUDFInstanceHolder";
        }
  
        @Override public String toString() {
          return "HiveUDFInstanceHolder";
        }
      };
      DeclarationStatement hiveUdfInstanceHolder =
          Expressions.declare(Modifier.FINAL,
              Expressions.parameter(typeOfHiveUdfInstanceHolder,
                  "hiveUDFInstanceHolder"),
              Expressions.new_(typeOfHiveUdfInstanceHolder));
      initialStatements.add(hiveUdfInstanceHolder);
      return initialStatements;
    }
  
    @Override protected void addMemberDeclaration(
        List<MemberDeclaration> memberDeclarations) {
      ClassDeclaration classDeclaration =
          Expressions.classDecl(
              Modifier.PUBLIC | Modifier.STATIC,
              "HiveUDFInstanceHolder",
              null,
              ImmutableList.of(Serializable.class),
              new ArrayList<>());
      classDeclaration.memberDeclarations.addAll(
          HiveUDFInstanceCollecterPerSqlQuery.get()
              .getStashedFieldsForHiveUDFInstanceHolder());
      memberDeclarations.add(classDeclaration);
    }
  }
  
  // End HiveEnumerableRelImplementor.java
  