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.EnumerableInterpretable;
  import org.apache.calcite.adapter.enumerable.EnumerableRel;
  import org.apache.calcite.avatica.Helper;
  import org.apache.calcite.jdbc.CalcitePrepare;
  import org.apache.calcite.linq4j.tree.ClassDeclaration;
  import org.apache.calcite.linq4j.tree.Expressions;
  import org.apache.calcite.prepare.CalcitePrepareImpl;
  import org.apache.calcite.runtime.ArrayBindable;
  import org.apache.calcite.runtime.Bindable;
  import org.apache.calcite.runtime.Hook;
  import org.apache.calcite.runtime.Typed;
  import org.apache.calcite.runtime.Utilities;
  import org.apache.calcite.util.Util;
  
  import org.codehaus.commons.compiler.CompileException;
  import org.codehaus.commons.compiler.CompilerFactoryFactory;
  import org.codehaus.commons.compiler.IClassBodyEvaluator;
  import org.codehaus.commons.compiler.ICompilerFactory;
  
  import java.io.IOException;
  import java.io.StringReader;
  import java.util.Map;
  
  /**
   *
   */
  public class HiveEnumerableInterpretable {
  
    private HiveEnumerableInterpretable() {
    }
  
    public static Bindable toBindable(Map<String, Object> parameters,
        CalcitePrepare.SparkHandler spark, EnumerableRel rel,
        EnumerableRel.Prefer prefer) {
      HiveEnumerableRelImplementor relImplementor =
          new HiveEnumerableRelImplementor(rel.getCluster().getRexBuilder(),
              parameters);
  
      final ClassDeclaration expr = relImplementor.implementRoot(rel, prefer);
      String s = Expressions.toString(expr.memberDeclarations, "\n", false);
  
      if (CalcitePrepareImpl.DEBUG) {
        Util.debugCode(System.out, s);
      }
  
      Hook.JAVA_PLAN.run(s);
  
      try {
        if (spark != null && spark.enabled()) {
          return spark.compile(expr, s);
        } else {
          return getBindable(expr, s,
              rel.getRowType().getFieldCount());
        }
      } catch (Exception e) {
        throw Helper.INSTANCE.wrap("Error while compiling generated Java code:\n"
            + s, e);
      }
    }
  
    static Bindable getBindable(ClassDeclaration expr, String s, int fieldCount)
        throws CompileException, IOException {
      ICompilerFactory compilerFactory;
      try {
        compilerFactory = CompilerFactoryFactory.getDefaultCompilerFactory();
      } catch (Exception e) {
        throw new IllegalStateException(
            "Unable to instantiate java compiler", e);
      }
      IClassBodyEvaluator cbe = compilerFactory.newClassBodyEvaluator();
      cbe.setClassName(expr.name);
      cbe.setExtendedClass(Utilities.class);
      cbe.setImplementedInterfaces(
          fieldCount == 1
              ? new Class[]{Bindable.class, Typed.class}
              : new Class[]{ArrayBindable.class});
      cbe.setParentClassLoader(EnumerableInterpretable.class.getClassLoader());
      if (CalcitePrepareImpl.DEBUG) {
        // Add line numbers to the generated janino class
        cbe.setDebuggingInformation(true, true, true);
      }
      return (Bindable) cbe.createInstance(new StringReader(s));
    }
  
  
  }
  
  // End HiveEnumerableInterpretable.java
  