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.runtime.evaluators.visitors;
  
  import java.util.List;
  
  import org.apache.asterix.dataflow.data.nontagged.serde.AInt32SerializerDeserializer;
  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.runtime.evaluators.functions.BinaryHashMap;
  import org.apache.asterix.runtime.evaluators.functions.PointableHelper;
  import org.apache.hyracks.algebricks.common.utils.Pair;
  import org.apache.hyracks.api.exceptions.HyracksDataException;
  import org.apache.hyracks.data.std.primitive.IntegerPointable;
  import org.apache.hyracks.data.std.util.BinaryEntry;
  
  class RecordDeepEqualityChecker {
      private final Pair<IVisitablePointable, Boolean> nestedVisitorArg =
              new Pair<IVisitablePointable, Boolean>(null, false);
      private final DeepEqualityVisitorHelper deepEqualityVisitorHelper = new DeepEqualityVisitorHelper();
      private DeepEqualityVisitor visitor;
      private BinaryEntry keyEntry = new BinaryEntry();
      private BinaryEntry valEntry = new BinaryEntry();
      private BinaryHashMap hashMap;
  
      public RecordDeepEqualityChecker(int tableSize, int tableFrameSize) {
          hashMap = deepEqualityVisitorHelper.initializeHashMap(tableSize, tableFrameSize, valEntry);
      }
  
      public RecordDeepEqualityChecker() {
          hashMap = deepEqualityVisitorHelper.initializeHashMap(valEntry);
      }
  
      public boolean accessRecord(IVisitablePointable recPointableLeft, IVisitablePointable recPointableRight,
              DeepEqualityVisitor visitor) throws HyracksDataException {
  
          if (recPointableLeft.equals(recPointableRight)) {
              return true;
          }
  
          this.visitor = visitor;
  
          hashMap.clear();
  
          ARecordVisitablePointable recLeft = (ARecordVisitablePointable) recPointableLeft;
          List<IVisitablePointable> fieldNamesLeft = recLeft.getFieldNames();
  
          ARecordVisitablePointable recRight = (ARecordVisitablePointable) recPointableRight;
          List<IVisitablePointable> fieldNamesRight = recRight.getFieldNames();
  
          int sizeLeft = fieldNamesLeft.size();
          int sizeRight = fieldNamesRight.size();
          if (sizeLeft != sizeRight) {
              return false;
          }
  
          // Build phase: Add items into hash map, starting with first record.
          for (int i = 0; i < sizeLeft; i++) {
              IVisitablePointable fieldName = fieldNamesLeft.get(i);
              keyEntry.set(fieldName.getByteArray(), fieldName.getStartOffset(), fieldName.getLength());
              IntegerPointable.setInteger(valEntry.getBuf(), 0, i);
              hashMap.put(keyEntry, valEntry);
          }
  
          return compareValues(recLeft.getFieldValues(), fieldNamesRight, recRight.getFieldValues());
      }
  
      private boolean compareValues(List<IVisitablePointable> fieldValuesLeft, List<IVisitablePointable> fieldNamesRight,
              List<IVisitablePointable> fieldValuesRight) throws HyracksDataException {
  
          // Probe phase: Probe items from second record
          for (int i = 0; i < fieldNamesRight.size(); i++) {
              IVisitablePointable fieldName = fieldNamesRight.get(i);
              keyEntry.set(fieldName.getByteArray(), fieldName.getStartOffset(), fieldName.getLength());
              BinaryEntry entry = hashMap.get(keyEntry);
              if (entry == null) {
                  return false;
              }
  
              int fieldIdLeft = AInt32SerializerDeserializer.getInt(entry.getBuf(), entry.getOffset());
              IVisitablePointable fieldValLeft = fieldValuesLeft.get(fieldIdLeft);
              IVisitablePointable fieldValRight = fieldValuesRight.get(i);
              ATypeTag fieldTypeLeft = PointableHelper.getTypeTag(fieldValLeft);
              if (fieldTypeLeft.isDerivedType() && fieldTypeLeft != PointableHelper.getTypeTag(fieldValRight)) {
                  return false;
              }
              nestedVisitorArg.first = fieldValRight;
              fieldValLeft.accept(visitor, nestedVisitorArg);
              if (nestedVisitorArg.second == false) {
                  return false;
              }
          }
          return true;
      }
  }
  