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.base;
  
  import org.apache.asterix.common.exceptions.CompilationException;
  import org.apache.asterix.om.exceptions.IncompatibleTypeException;
  import org.apache.asterix.om.typecomputer.impl.TypeComputeUtils;
  import org.apache.asterix.om.types.ATypeTag;
  import org.apache.asterix.om.types.IAType;
  import org.apache.asterix.om.types.hierachy.ATypeHierarchy;
  import org.apache.hyracks.algebricks.core.algebra.expressions.AbstractFunctionCallExpression;
  import org.apache.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
  
  public class TypeCastUtils {
  
      private TypeCastUtils() {
      }
  
      public static boolean setRequiredAndInputTypes(AbstractFunctionCallExpression expr, IAType requiredType,
              IAType inputType) throws CompilationException {
          return setRequiredAndInputTypes(expr, requiredType, inputType, true);
      }
  
      public static boolean setRequiredAndInputTypes(AbstractFunctionCallExpression expr, IAType requiredType,
              IAType inputType, boolean failIfTypeMismatch) throws CompilationException {
          boolean changed = false;
          Object[] opaqueParameters = expr.getOpaqueParameters();
          if (opaqueParameters == null) {
              opaqueParameters = new Object[2];
              opaqueParameters[0] = requiredType;
              opaqueParameters[1] = inputType;
              if (failIfTypeMismatch) {
                  ATypeTag requiredTypeTag = requiredType.getTypeTag();
                  ATypeTag actualTypeTag = TypeComputeUtils.getActualType(inputType).getTypeTag();
                  if (!ATypeHierarchy.isCompatible(requiredTypeTag, actualTypeTag)) {
                      FunctionIdentifier funcId = expr.getFunctionIdentifier();
                      throw new IncompatibleTypeException(expr.getSourceLocation(), funcId, actualTypeTag,
                              requiredTypeTag);
                  }
              }
              expr.setOpaqueParameters(opaqueParameters);
              changed = true;
          }
          return changed;
      }
  
      public static void resetRequiredAndInputTypes(AbstractFunctionCallExpression expr) {
          expr.setOpaqueParameters(null);
      }
  
      public static IAType getRequiredType(AbstractFunctionCallExpression expr) {
          Object[] type = expr.getOpaqueParameters();
          if (type != null) {
              IAType returnType = (IAType) type[0];
              return returnType;
          } else {
              return null;
          }
      }
  }
  