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.binary;
  
  import java.io.IOException;
  
  import org.apache.asterix.om.functions.BuiltinFunctions;
  import org.apache.asterix.om.types.ATypeTag;
  import org.apache.asterix.om.types.hierachy.ATypeHierarchy;
  import org.apache.asterix.runtime.evaluators.functions.PointableHelper;
  import org.apache.hyracks.algebricks.core.algebra.functions.FunctionIdentifier;
  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.api.exceptions.SourceLocation;
  import org.apache.hyracks.data.std.api.IPointable;
  import org.apache.hyracks.data.std.primitive.ByteArrayPointable;
  import org.apache.hyracks.dataflow.common.data.accessors.IFrameTupleReference;
  import org.apache.hyracks.util.encoding.VarLenIntEncoderDecoder;
  
  public abstract class AbstractSubBinaryEvaluator extends AbstractBinaryScalarEvaluator {
  
      private ByteArrayPointable byteArrayPointable = new ByteArrayPointable();
      private byte[] metaBuffer = new byte[5];
  
      private static final ATypeTag[] EXPECTED_INPUT_TAGS = { ATypeTag.BINARY, ATypeTag.INTEGER };
  
      public AbstractSubBinaryEvaluator(IEvaluatorContext context, IScalarEvaluatorFactory[] copyEvaluatorFactories,
              FunctionIdentifier funcId, SourceLocation sourceLoc) throws HyracksDataException {
          super(context, copyEvaluatorFactories, funcId, sourceLoc);
      }
  
      @Override
      public void evaluate(IFrameTupleReference tuple, IPointable result) throws HyracksDataException {
          resultStorage.reset();
          boolean isReturnNull = false;
  
          for (int i = 0; i < pointables.length; ++i) {
              evaluators[i].evaluate(tuple, pointables[i]);
  
              if (PointableHelper.checkAndSetMissingOrNull(result, pointables[i])) {
                  if (result.getByteArray()[0] == ATypeTag.SERIALIZED_MISSING_TYPE_TAG) {
                      return;
                  }
  
                  // null value, but check other arguments for missing first (higher priority)
                  isReturnNull = true;
              }
          }
  
          if (isReturnNull) {
              PointableHelper.setNull(result);
              return;
          }
  
          try {
              ATypeTag argTag0 =
                      ATypeTag.VALUE_TYPE_MAPPING[pointables[0].getByteArray()[pointables[0].getStartOffset()]];
              ATypeTag argTag1 =
                      ATypeTag.VALUE_TYPE_MAPPING[pointables[1].getByteArray()[pointables[1].getStartOffset()]];
              checkTypeMachingThrowsIfNot(EXPECTED_INPUT_TAGS, argTag0, argTag1);
  
              byteArrayPointable.set(pointables[0].getByteArray(), pointables[0].getStartOffset() + 1,
                      pointables[0].getLength() - 1);
              byte[] startBytes = pointables[1].getByteArray();
              int offset = pointables[1].getStartOffset();
  
              int subStart;
  
              subStart = ATypeHierarchy.getIntegerValue(BuiltinFunctions.SUBBINARY_FROM.getName(), 1, startBytes, offset);
  
              int totalLength = byteArrayPointable.getContentLength();
              int subLength = getSubLength(tuple);
  
              if (subStart < 0) {
                  subStart = 0;
              }
  
              if (subStart >= totalLength) {
                  subStart = 0;
                  subLength = 0;
              } else if (subLength < 0) {
                  subLength = 0;
              } else if (subLength > totalLength // for the IntMax case
                      || subStart + subLength > totalLength) {
                  subLength = totalLength - subStart;
              }
  
              dataOutput.write(ATypeTag.BINARY.serialize());
              int metaLength = VarLenIntEncoderDecoder.encode(subLength, metaBuffer, 0);
              dataOutput.write(metaBuffer, 0, metaLength);
  
              dataOutput.write(byteArrayPointable.getByteArray(), byteArrayPointable.getContentStartOffset() + subStart,
                      subLength);
          } catch (IOException e) {
              throw HyracksDataException.create(e);
          }
          result.set(resultStorage);
      }
  
      protected abstract int getSubLength(IFrameTupleReference tuple) throws HyracksDataException;
  }
  