package org.apache.beam.sdk.extensions.sql.impl.utils;

import com.google.common.base.Optional;

import java.util.Collection;
import java.util.List;

import org.apache.beam.sdk.extensions.sql.impl.interpreter.operator.BeamSqlExpression;
import org.apache.calcite.sql.type.SqlTypeName;

/**
 * Utils to help with SqlTypes.
 */
public class SqlTypeUtils {
  /**
   * Finds an operand with provided type.
   * Returns Optional.absent() if no operand found with matching type
   */
  public static Optional<BeamSqlExpression> findExpressionOfType(
      List<BeamSqlExpression> operands, SqlTypeName type) {

    for (BeamSqlExpression operand : operands) {
      if (type.equals(operand.getOutputType())) {
        return Optional.of(operand);
      }
    }

    return Optional.absent();
  }

  /**
   * Finds an operand with the type in typesToFind.
   * Returns Optional.absent() if no operand found with matching type
   */
  public static Optional<BeamSqlExpression> findExpressionOfType(
      List<BeamSqlExpression> operands, Collection<SqlTypeName> typesToFind) {

    for (BeamSqlExpression operand : operands) {
      if (typesToFind.contains(operand.getOutputType())) {
        return Optional.of(operand);
      }
    }

    return Optional.absent();
  }
}

@@ -1,8 +1,814 @@
+/*%0A * Licensed to the Apache Software Foundation (ASF) under one%0A * or more contributor license agreements.  See the NOTICE file%0A * distributed with this work for additional information%0A * regarding copyright ownership.  The ASF licenses this file%0A * to you under the Apache License, Version 2.0 (the%0A * %22License%22); you may not use this file except in compliance%0A * with the License.  You may obtain a copy of the License at%0A *%0A *     http://www.apache.org/licenses/LICENSE-2.0%0A *%0A * Unless required by applicable law or agreed to in writing, software%0A * distributed under the License is distributed on an %22AS IS%22 BASIS,%0A * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.%0A * See the License for the specific language governing permissions and%0A * limitations under the License.%0A */%0A
 package 

Add License Header to SqlTypeUtils