| /* |
| * 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.base.AMutableInt32; |
| import org.apache.asterix.om.exceptions.ExceptionUtil; |
| import org.apache.asterix.om.types.ATypeTag; |
| import org.apache.asterix.runtime.evaluators.common.ArgumentUtils; |
| import org.apache.hyracks.algebricks.core.algebra.functions.FunctionIdentifier; |
| import org.apache.hyracks.algebricks.runtime.base.IEvaluatorContext; |
| import org.apache.hyracks.algebricks.runtime.base.IScalarEvaluator; |
| import org.apache.hyracks.algebricks.runtime.base.IScalarEvaluatorFactory; |
| 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.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 |
| class Substring2Eval extends AbstractScalarEval { |
| |
| private final IEvaluatorContext context; |
| |
| private final ArrayBackedValueStorage resultStorage = new ArrayBackedValueStorage(); |
| private final DataOutput out = resultStorage.getDataOutput(); |
| private final IPointable argString = new VoidPointable(); |
| private final IPointable argStart = new VoidPointable(); |
| private final IScalarEvaluator evalString; |
| private final IScalarEvaluator evalStart; |
| private final GrowableArray array = new GrowableArray(); |
| private final UTF8StringBuilder builder = new UTF8StringBuilder(); |
| private final UTF8StringPointable string = new UTF8StringPointable(); |
| private final AMutableInt32 mutableInt = new AMutableInt32(0); |
| |
| private final int baseOffset; |
| |
| Substring2Eval(IEvaluatorContext context, IScalarEvaluatorFactory[] args, FunctionIdentifier functionIdentifier, |
| SourceLocation sourceLoc, int baseOffset) throws HyracksDataException { |
| super(sourceLoc, functionIdentifier); |
| this.context = context; |
| this.baseOffset = baseOffset; |
| evalString = args[0].createScalarEvaluator(context); |
| evalStart = args[1].createScalarEvaluator(context); |
| } |
| |
| @Override |
| public void evaluate(IFrameTupleReference tuple, IPointable result) throws HyracksDataException { |
| resultStorage.reset(); |
| evalString.evaluate(tuple, argString); |
| evalStart.evaluate(tuple, argStart); |
| |
| if (PointableHelper.checkAndSetMissingOrNull(result, argString, argStart)) { |
| return; |
| } |
| |
| byte[] bytes = argStart.getByteArray(); |
| int offset = argStart.getStartOffset(); |
| // check that the int argument is numeric without fractions (in case arg is double or float) |
| if (!ArgumentUtils.setInteger(context, srcLoc, funID, 1, bytes, offset, mutableInt)) { |
| PointableHelper.setNull(result); |
| return; |
| } |
| int start = mutableInt.getIntegerValue(); |
| bytes = argString.getByteArray(); |
| offset = argString.getStartOffset(); |
| int len = argString.getLength(); |
| if (bytes[offset] != ATypeTag.SERIALIZED_STRING_TYPE_TAG) { |
| PointableHelper.setNull(result); |
| ExceptionUtil.warnTypeMismatch(context, srcLoc, funID, bytes[offset], 0, ATypeTag.STRING); |
| return; |
| } |
| string.set(bytes, offset + 1, len - 1); |
| array.reset(); |
| try { |
| int actualStart = start >= 0 ? start - baseOffset : string.getStringLength() + start; |
| boolean success = UTF8StringPointable.substr(string, actualStart, Integer.MAX_VALUE, builder, array); |
| if (success) { |
| out.writeByte(ATypeTag.SERIALIZED_STRING_TYPE_TAG); |
| out.write(array.getByteArray(), 0, array.getLength()); |
| result.set(resultStorage); |
| } else { |
| PointableHelper.setNull(result); |
| } |
| } catch (IOException e) { |
| throw HyracksDataException.create(e); |
| } |
| } |
| } |