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.constructors;
  
  import java.io.DataOutput;
  import java.io.IOException;
  import java.util.regex.Pattern;
  
  import org.apache.asterix.common.annotations.MissingNullInOutFunction;
  import org.apache.asterix.dataflow.data.nontagged.serde.APointSerializerDeserializer;
  import org.apache.asterix.om.functions.BuiltinFunctions;
  import org.apache.asterix.om.functions.IFunctionDescriptorFactory;
  import org.apache.asterix.om.types.ATypeTag;
  import org.apache.asterix.runtime.evaluators.base.AbstractScalarFunctionDynamicDescriptor;
  import org.apache.asterix.runtime.evaluators.functions.PointableHelper;
  import org.apache.asterix.runtime.exceptions.InvalidDataFormatException;
  import org.apache.asterix.runtime.exceptions.TypeMismatchException;
  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.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 class APolygonConstructorDescriptor extends AbstractScalarFunctionDynamicDescriptor {
      private static final long serialVersionUID = 1L;
  
      private static final Pattern WS = Pattern.compile("\\s+");
      private static final Pattern COMMA = Pattern.compile(",");
  
      public static final IFunctionDescriptorFactory FACTORY = APolygonConstructorDescriptor::new;
  
      @Override
      public IScalarEvaluatorFactory createEvaluatorFactory(final IScalarEvaluatorFactory[] args) {
          return new IScalarEvaluatorFactory() {
              private static final long serialVersionUID = 1L;
  
              @Override
              public IScalarEvaluator createScalarEvaluator(IEvaluatorContext ctx) throws HyracksDataException {
                  return new IScalarEvaluator() {
  
                      private ArrayBackedValueStorage resultStorage = new ArrayBackedValueStorage();
                      private DataOutput out = resultStorage.getDataOutput();
                      private IPointable inputArg = new VoidPointable();
                      private IScalarEvaluator eval = args[0].createScalarEvaluator(ctx);
                      private final UTF8StringPointable utf8Ptr = new UTF8StringPointable();
  
                      @Override
                      public void evaluate(IFrameTupleReference tuple, IPointable result) throws HyracksDataException {
                          try {
                              eval.evaluate(tuple, inputArg);
  
                              if (PointableHelper.checkAndSetMissingOrNull(result, inputArg)) {
                                  return;
                              }
  
                              byte[] serString = inputArg.getByteArray();
                              int offset = inputArg.getStartOffset();
                              int len = inputArg.getLength();
  
                              byte tt = serString[offset];
                              if (tt == ATypeTag.SERIALIZED_POLYGON_TYPE_TAG) {
                                  result.set(inputArg);
                              } else if (tt == ATypeTag.SERIALIZED_STRING_TYPE_TAG) {
                                  resultStorage.reset();
                                  utf8Ptr.set(serString, offset + 1, len - 1);
                                  String s = utf8Ptr.toString();
                                  String[] points = WS.split(s.trim());
                                  if (points.length <= 2) {
                                      throw new InvalidDataFormatException(sourceLoc, getIdentifier(),
                                              ATypeTag.SERIALIZED_POLYGON_TYPE_TAG);
                                  }
                                  out.writeByte(ATypeTag.SERIALIZED_POLYGON_TYPE_TAG);
                                  out.writeShort(points.length);
                                  for (int i = 0; i < points.length; i++) {
                                      final String[] point = COMMA.split(points[i]);
                                      APointSerializerDeserializer.serialize(Double.parseDouble(point[0]),
                                              Double.parseDouble(point[1]), out);
                                  }
                                  result.set(resultStorage);
                              } else {
                                  throw new TypeMismatchException(sourceLoc, getIdentifier(), 0, tt,
                                          ATypeTag.SERIALIZED_STRING_TYPE_TAG);
                              }
                          } catch (IOException e) {
                              throw new InvalidDataFormatException(sourceLoc, getIdentifier(), e,
                                      ATypeTag.SERIALIZED_POLYGON_TYPE_TAG);
                          }
                      }
                  };
              }
          };
      }
  
      @Override
      public FunctionIdentifier getIdentifier() {
          return BuiltinFunctions.POLYGON_CONSTRUCTOR;
      }
  
  }
  