| /* |
| * Copyright 2009-2010 by The Regents of the University of California |
| * Licensed 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 from |
| * |
| * 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 edu.uci.ics.hyracks.algebricks.core.algebra.runtime.operators.aggreg; |
| |
| import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IAggregateFunction; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IAggregateFunctionFactory; |
| import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException; |
| import edu.uci.ics.hyracks.algebricks.core.utils.Pair; |
| import edu.uci.ics.hyracks.api.comm.IFrameTupleAccessor; |
| import edu.uci.ics.hyracks.api.context.IHyracksTaskContext; |
| import edu.uci.ics.hyracks.api.dataflow.value.RecordDescriptor; |
| import edu.uci.ics.hyracks.api.exceptions.HyracksDataException; |
| import edu.uci.ics.hyracks.dataflow.common.comm.io.ArrayTupleBuilder; |
| import edu.uci.ics.hyracks.dataflow.common.data.accessors.ArrayBackedValueStorage; |
| import edu.uci.ics.hyracks.dataflow.common.data.accessors.FrameTupleReference; |
| import edu.uci.ics.hyracks.dataflow.std.group.AggregateState; |
| import edu.uci.ics.hyracks.dataflow.std.group.IAggregatorDescriptor; |
| import edu.uci.ics.hyracks.dataflow.std.group.IAggregatorDescriptorFactory; |
| |
| public class SimpleAlgebricksAccumulatingAggregatorFactory implements IAggregatorDescriptorFactory { |
| |
| private static final long serialVersionUID = 1L; |
| private IAggregateFunctionFactory[] aggFactories; |
| |
| public SimpleAlgebricksAccumulatingAggregatorFactory(IAggregateFunctionFactory[] aggFactories, int[] keys, |
| int[] fdColumns) { |
| this.aggFactories = aggFactories; |
| } |
| |
| @SuppressWarnings("unchecked") |
| @Override |
| public IAggregatorDescriptor createAggregator(IHyracksTaskContext ctx, RecordDescriptor inRecordDesc, |
| RecordDescriptor outRecordDescriptor, int[] aggKeys, int[] partialKeys) throws HyracksDataException { |
| |
| return new IAggregatorDescriptor() { |
| |
| private FrameTupleReference ftr = new FrameTupleReference(); |
| |
| @Override |
| public void init(ArrayTupleBuilder tupleBuilder, IFrameTupleAccessor accessor, int tIndex, |
| AggregateState state) throws HyracksDataException { |
| Pair<ArrayBackedValueStorage[], IAggregateFunction[]> aggState = (Pair<ArrayBackedValueStorage[], IAggregateFunction[]>) state.state; |
| ArrayBackedValueStorage[] aggOutput = aggState.first; |
| IAggregateFunction[] agg = aggState.second; |
| |
| // initialize aggregate functions |
| for (int i = 0; i < agg.length; i++) { |
| aggOutput[i].reset(); |
| try { |
| agg[i].init(); |
| } catch (AlgebricksException e) { |
| throw new HyracksDataException(e); |
| } |
| } |
| |
| ftr.reset(accessor, tIndex); |
| for (int i = 0; i < agg.length; i++) { |
| try { |
| agg[i].step(ftr); |
| } catch (AlgebricksException e) { |
| throw new HyracksDataException(e); |
| } |
| } |
| } |
| |
| @Override |
| public void aggregate(IFrameTupleAccessor accessor, int tIndex, IFrameTupleAccessor stateAccessor, |
| int stateTupleIndex, AggregateState state) throws HyracksDataException { |
| Pair<ArrayBackedValueStorage[], IAggregateFunction[]> aggState = (Pair<ArrayBackedValueStorage[], IAggregateFunction[]>) state.state; |
| IAggregateFunction[] agg = aggState.second; |
| ftr.reset(accessor, tIndex); |
| for (int i = 0; i < agg.length; i++) { |
| try { |
| agg[i].step(ftr); |
| } catch (AlgebricksException e) { |
| throw new HyracksDataException(e); |
| } |
| } |
| } |
| |
| @Override |
| public void outputFinalResult(ArrayTupleBuilder tupleBuilder, IFrameTupleAccessor accessor, int tIndex, |
| AggregateState state) throws HyracksDataException { |
| Pair<ArrayBackedValueStorage[], IAggregateFunction[]> aggState = (Pair<ArrayBackedValueStorage[], IAggregateFunction[]>) state.state; |
| ArrayBackedValueStorage[] aggOutput = aggState.first; |
| IAggregateFunction[] agg = aggState.second; |
| for (int i = 0; i < agg.length; i++) { |
| try { |
| agg[i].finish(); |
| tupleBuilder.addField(aggOutput[i].getBytes(), aggOutput[i].getStartIndex(), |
| aggOutput[i].getLength()); |
| } catch (AlgebricksException e) { |
| throw new HyracksDataException(e); |
| } |
| } |
| } |
| |
| @Override |
| public AggregateState createAggregateStates() { |
| IAggregateFunction[] agg = new IAggregateFunction[aggFactories.length]; |
| ArrayBackedValueStorage[] aggOutput = new ArrayBackedValueStorage[aggFactories.length]; |
| for (int i = 0; i < agg.length; i++) { |
| aggOutput[i] = new ArrayBackedValueStorage(); |
| try { |
| agg[i] = aggFactories[i].createAggregateFunction(aggOutput[i]); |
| } catch (AlgebricksException e) { |
| throw new IllegalStateException(e); |
| } |
| } |
| return new AggregateState(new Pair<ArrayBackedValueStorage[], IAggregateFunction[]>(aggOutput, agg)); |
| } |
| |
| @Override |
| public void reset() { |
| |
| } |
| |
| @Override |
| public void outputPartialResult(ArrayTupleBuilder tupleBuilder, IFrameTupleAccessor accessor, int tIndex, |
| AggregateState state) throws HyracksDataException { |
| throw new IllegalStateException("this method should not be called"); |
| } |
| |
| @Override |
| public void close() { |
| |
| } |
| |
| }; |
| } |
| } |