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.types.visitor;
  
  import org.apache.asterix.om.types.ARecordType;
  import org.apache.asterix.om.types.AUnionType;
  import org.apache.asterix.om.types.AbstractCollectionType;
  import org.apache.asterix.om.types.IAType;
  import org.apache.asterix.om.types.IATypeVisitor;
  import org.apache.hyracks.algebricks.common.exceptions.NotImplementedException;
  
  /**
   * Produces a path from a type
   */
  public class PathStringBuilderForIATypeVisitor implements IATypeVisitor<Void, StringBuilder> {
      private boolean root = true;
  
      @Override
      public Void visit(ARecordType recordType, StringBuilder arg) {
          // here we assume the record type has only one child
          if (root) {
              arg.append("$$root");
              root = false;
          }
          arg.append('.');
          arg.append(recordType.getFieldNames()[0]);
          recordType.getFieldTypes()[0].accept(this, arg);
          return null;
      }
  
      @Override
      public Void visit(AbstractCollectionType collectionType, StringBuilder arg) {
          arg.append("[*]");
          collectionType.getItemType().accept(this, arg);
          return null;
      }
  
      @Override
      public Void visit(AUnionType unionType, StringBuilder arg) {
          throw new NotImplementedException("Check how to represent this");
      }
  
      @Override
      public Void visitFlat(IAType flatType, StringBuilder arg) {
          return null;
      }
  }
  