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.io.IOException;
  
  import org.apache.asterix.common.annotations.MissingNullInOutFunction;
  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.ATypeTag;
  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.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.data.std.util.GrowableArray;
  import org.apache.hyracks.data.std.util.UTF8StringBuilder;
  import org.apache.hyracks.dataflow.common.data.accessors.IFrameTupleReference;
  
  @MissingNullInOutFunction
  public class SubstringAfterDescriptor extends AbstractScalarFunctionDynamicDescriptor {
      private static final long serialVersionUID = 1L;
      public static final IFunctionDescriptorFactory FACTORY = SubstringAfterDescriptor::new;
  
      @Override
      public IScalarEvaluatorFactory createEvaluatorFactory(final IScalarEvaluatorFactory[] args) {
          return new IScalarEvaluatorFactory() {
              private static final long serialVersionUID = 1L;
  
              @Override
              public IScalarEvaluator createScalarEvaluator(final IEvaluatorContext ctx) throws HyracksDataException {
                  return new IScalarEvaluator() {
                      private ArrayBackedValueStorage resultStorage = new ArrayBackedValueStorage();
                      private DataOutput out = resultStorage.getDataOutput();
                      private IPointable array0 = new VoidPointable();
                      private IPointable array1 = new VoidPointable();
                      private IScalarEvaluator evalString = args[0].createScalarEvaluator(ctx);
                      private IScalarEvaluator evalPattern = args[1].createScalarEvaluator(ctx);
                      private final GrowableArray array = new GrowableArray();
                      private final UTF8StringBuilder builder = new UTF8StringBuilder();
                      private final UTF8StringPointable stringPtr = new UTF8StringPointable();
                      private final UTF8StringPointable patternPtr = new UTF8StringPointable();
  
                      @Override
                      public void evaluate(IFrameTupleReference tuple, IPointable result) throws HyracksDataException {
                          resultStorage.reset();
                          evalString.evaluate(tuple, array0);
                          evalPattern.evaluate(tuple, array1);
  
                          if (PointableHelper.checkAndSetMissingOrNull(result, array0, array1)) {
                              return;
                          }
  
                          byte[] src = array0.getByteArray();
                          int srcOffset = array0.getStartOffset();
                          int srcLen = array0.getLength();
                          byte[] pattern = array1.getByteArray();
                          int patternOffset = array1.getStartOffset();
                          int patternLen = array1.getLength();
  
                          if (src[srcOffset] != ATypeTag.SERIALIZED_STRING_TYPE_TAG) {
                              PointableHelper.setNull(result);
                              ExceptionUtil.warnTypeMismatch(ctx, sourceLoc, getIdentifier(), src[srcOffset], 0,
                                      ATypeTag.STRING);
                              return;
                          }
                          if (pattern[patternOffset] != ATypeTag.SERIALIZED_STRING_TYPE_TAG) {
                              PointableHelper.setNull(result);
                              ExceptionUtil.warnTypeMismatch(ctx, sourceLoc, getIdentifier(), pattern[patternOffset], 1,
                                      ATypeTag.STRING);
                              return;
                          }
  
                          try {
                              stringPtr.set(src, srcOffset + 1, srcLen - 1);
                              patternPtr.set(pattern, patternOffset + 1, patternLen - 1);
                              array.reset();
  
                              UTF8StringPointable.substrAfter(stringPtr, patternPtr, builder, array);
                              out.writeByte(ATypeTag.SERIALIZED_STRING_TYPE_TAG);
                              out.write(array.getByteArray(), 0, array.getLength());
                          } catch (IOException e) {
                              throw HyracksDataException.create(e);
                          }
                          result.set(resultStorage);
                      }
                  }
  
                  ;
              }
          }
  
          ;
      }
  
      @Override
      public FunctionIdentifier getIdentifier() {
          return BuiltinFunctions.SUBSTRING_AFTER;
      }
  }
  