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.om.typecomputer.impl;
  
  import java.util.Objects;
  
  import org.apache.asterix.om.typecomputer.base.AbstractResultTypeComputer;
  import org.apache.asterix.om.types.AUnionType;
  import org.apache.asterix.om.types.IAType;
  import org.apache.hyracks.algebricks.common.exceptions.AlgebricksException;
  import org.apache.hyracks.algebricks.core.algebra.base.ILogicalExpression;
  
  public abstract class AbstractConstructorTypeComputer extends AbstractResultTypeComputer {
  
      protected final IAType primeType;
  
      protected final boolean nullable;
  
      protected AbstractConstructorTypeComputer(IAType primeType, boolean nullable) {
          this.primeType = Objects.requireNonNull(primeType);
          this.nullable = nullable;
      }
  
      @Override
      protected final IAType getResultType(ILogicalExpression expr, IAType... strippedInputTypes)
              throws AlgebricksException {
          if (!nullable || (strippedInputTypes.length == 1 && isAlwaysCastable(strippedInputTypes[0]))) {
              return primeType;
          } else {
              return AUnionType.createNullableType(primeType);
          }
      }
  
      protected boolean isAlwaysCastable(IAType inputType) {
          return primeType.deepEqual(inputType);
      }
  }
  