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.pointables.printer;
  
  import java.io.PrintStream;
  import java.util.List;
  
  import org.apache.asterix.om.pointables.AListVisitablePointable;
  import org.apache.asterix.om.pointables.base.IVisitablePointable;
  import org.apache.asterix.om.types.ATypeTag;
  import org.apache.asterix.om.utils.PointableHelper;
  import org.apache.hyracks.algebricks.common.utils.Pair;
  import org.apache.hyracks.api.exceptions.HyracksDataException;
  
  /**
   * This class is to print the content of a list.
   */
  public class AListPrinter {
      private final String startList;
      private final String endList;
      private final String separator;
  
      private final Pair<PrintStream, ATypeTag> itemVisitorArg = new Pair<>(null, null);
  
      public AListPrinter(String startList, String endList, String separator) {
          this.startList = startList;
          this.endList = endList;
          this.separator = separator;
      }
  
      public void printList(AListVisitablePointable listAccessor, PrintStream ps, IPrintVisitor visitor)
              throws HyracksDataException {
          List<IVisitablePointable> items = listAccessor.getItems();
          itemVisitorArg.first = ps;
          ps.print(startList);
  
          // print item 0 to n-2
          final int size = items.size();
          for (int i = 0; i < size - 1; i++) {
              printItem(visitor, items, i);
              ps.print(separator);
          }
  
          // print item n-1
          if (size > 0) {
              printItem(visitor, items, size - 1);
          }
  
          ps.print(endList);
      }
  
      private void printItem(IPrintVisitor visitor, List<IVisitablePointable> items, int i) throws HyracksDataException {
          IVisitablePointable item = items.get(i);
          ATypeTag typeTag = PointableHelper.getTypeTag(item);
          itemVisitorArg.second = getItemTypeTag(item, typeTag);
          item.accept(visitor, itemVisitorArg);
      }
  
      protected ATypeTag getItemTypeTag(IVisitablePointable item, ATypeTag typeTag) {
          return item.getLength() <= 1 ? ATypeTag.NULL : typeTag;
      }
  }
  