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.functions;
  
  import java.io.DataOutput;
  import java.util.ArrayList;
  import java.util.List;
  
  import org.apache.asterix.builders.OrderedListBuilder;
  import org.apache.asterix.common.annotations.MissingNullInOutFunction;
  import org.apache.asterix.common.exceptions.AsterixException;
  import org.apache.asterix.common.metadata.DataverseName;
  import org.apache.asterix.formats.nontagged.SerializerDeserializerProvider;
  import org.apache.asterix.om.base.AMutableString;
  import org.apache.asterix.om.exceptions.ExceptionUtil;
  import org.apache.asterix.om.functions.BuiltinFunctions;
  import org.apache.asterix.om.functions.IFunctionDescriptorFactory;
  import org.apache.asterix.om.types.AOrderedListType;
  import org.apache.asterix.om.types.ATypeTag;
  import org.apache.asterix.om.types.BuiltinType;
  import org.apache.asterix.runtime.evaluators.base.AbstractScalarFunctionDynamicDescriptor;
  import org.apache.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
  import org.apache.hyracks.algebricks.runtime.base.IScalarEvaluator;
  import org.apache.hyracks.algebricks.runtime.base.IScalarEvaluatorFactory;
  import org.apache.hyracks.api.context.IEvaluatorContext;
  import org.apache.hyracks.api.dataflow.value.ISerializerDeserializer;
  import org.apache.hyracks.api.exceptions.HyracksDataException;
  import org.apache.hyracks.data.std.api.IPointable;
  import org.apache.hyracks.data.std.primitive.UTF8StringPointable;
  import org.apache.hyracks.data.std.primitive.VoidPointable;
  import org.apache.hyracks.data.std.util.ArrayBackedValueStorage;
  import org.apache.hyracks.dataflow.common.data.accessors.IFrameTupleReference;
  
  @MissingNullInOutFunction
  public final class DecodeDataverseNameDescriptor extends AbstractScalarFunctionDynamicDescriptor {
      private static final long serialVersionUID = 1L;
  
      public static final IFunctionDescriptorFactory FACTORY = DecodeDataverseNameDescriptor::new;
  
      @Override
      public IScalarEvaluatorFactory createEvaluatorFactory(IScalarEvaluatorFactory[] args) {
          return new IScalarEvaluatorFactory() {
              private static final long serialVersionUID = 1L;
  
              @Override
              public IScalarEvaluator createScalarEvaluator(IEvaluatorContext ctx) throws HyracksDataException {
                  return new AbstractScalarEval(sourceLoc, getIdentifier()) {
                      private final IScalarEvaluator eval0 = args[0].createScalarEvaluator(ctx);
  
                      private final VoidPointable arg0 = VoidPointable.FACTORY.createPointable();
                      private final UTF8StringPointable strPtr = new UTF8StringPointable();
                      private final List<String> dataverseNameParts = new ArrayList<>();
  
                      private final AOrderedListType listType = new AOrderedListType(BuiltinType.ASTRING, null);
                      private final OrderedListBuilder listBuilder = new OrderedListBuilder();
                      private final ArrayBackedValueStorage itemStorage = new ArrayBackedValueStorage();
                      private final DataOutput itemOut = itemStorage.getDataOutput();
                      private final ArrayBackedValueStorage resultStorage = new ArrayBackedValueStorage();
                      private final DataOutput resultOut = resultStorage.getDataOutput();
  
                      @SuppressWarnings("rawtypes")
                      private final ISerializerDeserializer stringSerde =
                              SerializerDeserializerProvider.INSTANCE.getSerializerDeserializer(BuiltinType.ASTRING);
                      private final AMutableString aString = new AMutableString("");
  
                      @Override
                      public void evaluate(IFrameTupleReference tuple, IPointable result) throws HyracksDataException {
                          eval0.evaluate(tuple, arg0);
                          if (PointableHelper.checkAndSetMissingOrNull(result, arg0)) {
                              return;
                          }
  
                          byte[] bytes = arg0.getByteArray();
                          int offset = arg0.getStartOffset();
                          int len = arg0.getLength();
  
                          // Type check.
                          if (bytes[offset] != ATypeTag.SERIALIZED_STRING_TYPE_TAG) {
                              PointableHelper.setNull(result);
                              ExceptionUtil.warnTypeMismatch(ctx, srcLoc, getIdentifier(), bytes[offset], 0,
                                      ATypeTag.STRING);
                              return;
                          }
  
                          strPtr.set(bytes, offset + 1, len - 1);
                          String dataverseCanonicalName = strPtr.toString();
  
                          try {
                              dataverseNameParts.clear();
                              DataverseName.getPartsFromCanonicalForm(dataverseCanonicalName, dataverseNameParts);
                          } catch (AsterixException e) {
                              PointableHelper.setNull(result);
                              return;
                          }
  
                          resultStorage.reset();
                          listBuilder.reset(listType);
                          for (String part : dataverseNameParts) {
                              itemStorage.reset();
                              aString.setValue(part);
                              stringSerde.serialize(aString, itemOut);
                              listBuilder.addItem(itemStorage);
                          }
                          listBuilder.write(resultOut, true);
                          result.set(resultStorage);
                      }
                  };
              }
          };
      }
  
      @Override
      public FunctionIdentifier getIdentifier() {
          return BuiltinFunctions.DECODE_DATAVERSE_NAME;
      }
  }
  