| /* |
| * 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.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.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.data.std.api.IPointable; |
| 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; |
| import org.apache.hyracks.util.string.UTF8StringUtil; |
| |
| @MissingNullInOutFunction |
| public class StringRepeatDescriptor extends AbstractScalarFunctionDynamicDescriptor { |
| private static final long serialVersionUID = 1L; |
| public static final IFunctionDescriptorFactory FACTORY = StringRepeatDescriptor::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() { |
| // Argument evaluators. |
| private IScalarEvaluator evalString = args[0].createScalarEvaluator(ctx); |
| private IScalarEvaluator evalStart = args[1].createScalarEvaluator(ctx); |
| |
| // Argument pointers. |
| private IPointable argString = new VoidPointable(); |
| private IPointable argNumber = new VoidPointable(); |
| private final AMutableInt32 mutableInt = new AMutableInt32(0); |
| |
| // For outputting the result. |
| private ArrayBackedValueStorage resultStorage = new ArrayBackedValueStorage(); |
| private DataOutput out = resultStorage.getDataOutput(); |
| private byte[] tempLengthArray = new byte[5]; |
| |
| @Override |
| public void evaluate(IFrameTupleReference tuple, IPointable result) throws HyracksDataException { |
| resultStorage.reset(); |
| |
| // Calls argument evaluators. |
| evalString.evaluate(tuple, argString); |
| evalStart.evaluate(tuple, argNumber); |
| |
| if (PointableHelper.checkAndSetMissingOrNull(result, argString, argNumber)) { |
| return; |
| } |
| |
| // Gets the repeating times. |
| byte[] bytes = argNumber.getByteArray(); |
| int offset = argNumber.getStartOffset(); |
| if (!ArgumentUtils.checkWarnOrSetInteger(ctx, sourceLoc, getIdentifier(), 1, bytes, offset, |
| mutableInt)) { |
| PointableHelper.setNull(result); |
| return; |
| } |
| int repeatingTimes = mutableInt.getIntegerValue(); |
| // Checks repeatingTimes. It should be a non-negative value. |
| if (repeatingTimes < 0) { |
| PointableHelper.setNull(result); |
| ExceptionUtil.warnNegativeValue(ctx, sourceLoc, getIdentifier(), 1, repeatingTimes); |
| return; |
| } |
| |
| // Gets the input string. |
| bytes = argString.getByteArray(); |
| offset = argString.getStartOffset(); |
| // Checks the type of the string argument. |
| if (bytes[offset] != ATypeTag.SERIALIZED_STRING_TYPE_TAG) { |
| PointableHelper.setNull(result); |
| ExceptionUtil.warnTypeMismatch(ctx, sourceLoc, getIdentifier(), bytes[offset], 0, |
| ATypeTag.STRING); |
| return; |
| } |
| |
| // Calculates the result string length. |
| int inputLen = UTF8StringUtil.getUTFLength(bytes, offset + 1); |
| int resultLen = Math.multiplyExact(inputLen, repeatingTimes); // Can throw overflow exception. |
| int cbytes = UTF8StringUtil.encodeUTF8Length(resultLen, tempLengthArray, 0); |
| |
| // Writes the output string. |
| int inputStringStart = offset + 1 + UTF8StringUtil.getNumBytesToStoreLength(inputLen); |
| try { |
| out.writeByte(ATypeTag.SERIALIZED_STRING_TYPE_TAG); |
| out.write(tempLengthArray, 0, cbytes); |
| for (int numRepeats = 0; numRepeats < repeatingTimes; ++numRepeats) { |
| out.write(bytes, inputStringStart, inputLen); |
| } |
| } catch (IOException e) { |
| throw HyracksDataException.create(e); |
| } |
| result.set(resultStorage); |
| } |
| }; |
| } |
| }; |
| } |
| |
| @Override |
| public FunctionIdentifier getIdentifier() { |
| return BuiltinFunctions.STRING_REPEAT; |
| } |
| } |