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.optimizer.rules.pushdown.schema;
  
  import static org.apache.asterix.optimizer.rules.pushdown.schema.AbstractComplexExpectedSchemaNode.createNestedNode;
  
  import org.apache.hyracks.algebricks.core.algebra.base.ILogicalExpression;
  import org.apache.hyracks.algebricks.core.algebra.expressions.AbstractFunctionCallExpression;
  
  public class AnyExpectedSchemaNode extends AbstractExpectedSchemaNode {
      private boolean replaceable;
  
      public AnyExpectedSchemaNode(AbstractComplexExpectedSchemaNode parent, AbstractFunctionCallExpression expression) {
          super(parent, expression, expression);
          replaceable = true;
      }
  
      protected AnyExpectedSchemaNode(AbstractComplexExpectedSchemaNode parent, AbstractFunctionCallExpression expression,
              boolean replaceable) {
          super(parent, expression, expression);
          this.replaceable = replaceable;
      }
  
      @Override
      public boolean allowsReplacing() {
          return replaceable;
      }
  
      public void preventReplacing() {
          replaceable = false;
      }
  
      @Override
      public IExpectedSchemaNode replaceIfNeeded(ExpectedSchemaNodeType expectedNodeType,
              AbstractFunctionCallExpression parentExpression, ILogicalExpression expression) {
          if (expectedNodeType == ExpectedSchemaNodeType.ANY) {
              return this;
          }
          /*
           * ANY node is typeless (i.e., we do not know what is the possible type of ANY node) when we created it.
           * However, now the query says it is (possibly) a nested value. We know that because there is a field
           * access expression or an array access expression on that node. So, we should replace the ANY node to
           * the given nested type.
           */
          AbstractComplexExpectedSchemaNode parent = getParent();
          AbstractComplexExpectedSchemaNode nestedNode =
                  createNestedNode(expectedNodeType, parent, this.parentExpression, expression);
          return parent.replaceChild(this, nestedNode);
      }
  
      @Override
      public ExpectedSchemaNodeType getType() {
          return ExpectedSchemaNodeType.ANY;
      }
  
      @Override
      public <R, T> R accept(IExpectedSchemaNodeVisitor<R, T> visitor, T arg) {
          return visitor.visit(this, arg);
      }
  }
  