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.ARecordVisitablePointable;
  import org.apache.asterix.om.pointables.base.IVisitablePointable;
  import org.apache.asterix.om.types.ATypeTag;
  import org.apache.asterix.om.types.EnumDeserializer;
  import org.apache.hyracks.algebricks.common.utils.Pair;
  import org.apache.hyracks.api.exceptions.HyracksDataException;
  
  /**
   * This class is to print the content of a record.
   */
  public class ARecordPrinter {
      protected final String startRecord;
      protected final String endRecord;
      protected final String fieldSeparator;
      protected final String fieldNameSeparator;
  
      protected final Pair<PrintStream, ATypeTag> nameVisitorArg = new Pair<>(null, ATypeTag.STRING);
      protected final Pair<PrintStream, ATypeTag> itemVisitorArg = new Pair<>(null, null);
  
      public ARecordPrinter(final String startRecord, final String endRecord, final String fieldSeparator,
              final String fieldNameSeparator) {
          this.startRecord = startRecord;
          this.endRecord = endRecord;
          this.fieldSeparator = fieldSeparator;
          this.fieldNameSeparator = fieldNameSeparator;
      }
  
      public void printRecord(ARecordVisitablePointable recordAccessor, PrintStream ps, IPrintVisitor visitor)
              throws HyracksDataException {
          final List<IVisitablePointable> fieldNames = recordAccessor.getFieldNames();
          final List<IVisitablePointable> fieldValues = recordAccessor.getFieldValues();
  
          nameVisitorArg.first = ps;
          itemVisitorArg.first = ps;
  
          ps.print(startRecord);
  
          boolean first = true;
          final int size = fieldNames.size();
          for (int i = 0; i < size; ++i) {
              final IVisitablePointable fieldName = fieldNames.get(i);
              final IVisitablePointable fieldValue = fieldValues.get(i);
              final ATypeTag typeTag = EnumDeserializer.ATYPETAGDESERIALIZER
                      .deserialize(fieldValue.getByteArray()[fieldValue.getStartOffset()]);
  
              // Prints the current field.
              if (typeTag != ATypeTag.MISSING) {
                  if (first) {
                      //Skip printing field separator for the first field.
                      first = false;
                  } else {
                      ps.print(fieldSeparator);
                  }
                  printField(ps, visitor, fieldName, fieldValue, typeTag);
              }
          }
  
          ps.print(endRecord);
      }
  
      protected void printField(PrintStream ps, IPrintVisitor visitor, IVisitablePointable fieldName,
              IVisitablePointable fieldValue, ATypeTag fieldTypeTag) throws HyracksDataException {
          itemVisitorArg.second = fieldTypeTag;
          if (fieldNameSeparator != null) {
              printFieldName(ps, visitor, fieldName);
              ps.print(fieldNameSeparator);
          }
          printFieldValue(visitor, fieldValue);
      }
  
      protected void printFieldName(PrintStream ps, IPrintVisitor visitor, IVisitablePointable fieldName)
              throws HyracksDataException {
          fieldName.accept(visitor, nameVisitorArg);
      }
  
      protected void printFieldValue(IPrintVisitor visitor, IVisitablePointable fieldValue) throws HyracksDataException {
          fieldValue.accept(visitor, itemVisitorArg);
      }
  }
  