| /* |
| * 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.vxquery.runtime.functions.sequence; |
| |
| import java.io.DataOutput; |
| import java.io.IOException; |
| |
| import org.apache.hyracks.algebricks.runtime.base.IAggregateEvaluator; |
| 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.vxquery.datamodel.accessors.SequencePointable; |
| import org.apache.vxquery.datamodel.accessors.TaggedValuePointable; |
| import org.apache.vxquery.datamodel.values.ValueTag; |
| import org.apache.vxquery.exceptions.ErrorCode; |
| import org.apache.vxquery.exceptions.SystemException; |
| import org.apache.vxquery.runtime.functions.base.AbstractTaggedValueArgumentAggregateEvaluator; |
| import org.apache.vxquery.runtime.functions.base.AbstractTaggedValueArgumentAggregateEvaluatorFactory; |
| import org.apache.vxquery.util.GrowableIntArray; |
| |
| public class SequenceAggregateEvaluatorFactory extends AbstractTaggedValueArgumentAggregateEvaluatorFactory { |
| private static final long serialVersionUID = 1L; |
| |
| public SequenceAggregateEvaluatorFactory(IScalarEvaluatorFactory[] args) { |
| super(args); |
| } |
| |
| @Override |
| protected IAggregateEvaluator createEvaluator(IScalarEvaluator[] args) throws HyracksDataException { |
| final ArrayBackedValueStorage abvs = new ArrayBackedValueStorage(); |
| final GrowableIntArray slots = new GrowableIntArray(); |
| final ArrayBackedValueStorage dataArea = new ArrayBackedValueStorage(); |
| final SequencePointable seq = (SequencePointable) SequencePointable.FACTORY.createPointable(); |
| final VoidPointable p = (VoidPointable) VoidPointable.FACTORY.createPointable(); |
| return new AbstractTaggedValueArgumentAggregateEvaluator(args) { |
| @Override |
| public void init() throws HyracksDataException { |
| abvs.reset(); |
| slots.clear(); |
| dataArea.reset(); |
| } |
| |
| @Override |
| public void finishPartial(IPointable result) throws HyracksDataException { |
| finish(result); |
| } |
| |
| @Override |
| public void finish(IPointable result) throws HyracksDataException { |
| if (slots.getSize() != 1) { |
| assembleResult(abvs, slots, dataArea); |
| result.set(abvs); |
| } else { |
| result.set(dataArea); |
| } |
| } |
| |
| @Override |
| protected void step(TaggedValuePointable[] args) throws SystemException { |
| TaggedValuePointable tvp = args[0]; |
| if (tvp.getTag() == ValueTag.SEQUENCE_TAG) { |
| tvp.getValue(seq); |
| int seqLen = seq.getEntryCount(); |
| for (int j = 0; j < seqLen; ++j) { |
| seq.getEntry(j, p); |
| addItem(p); |
| } |
| } else { |
| addItem(tvp); |
| } |
| } |
| |
| private void assembleResult(ArrayBackedValueStorage abvs, GrowableIntArray slots, |
| ArrayBackedValueStorage dataArea) throws SystemException { |
| try { |
| DataOutput out = abvs.getDataOutput(); |
| out.write(ValueTag.SEQUENCE_TAG); |
| int size = slots.getSize(); |
| out.writeInt(size); |
| if (size > 0) { |
| int[] slotArray = slots.getArray(); |
| for (int i = 0; i < size; ++i) { |
| out.writeInt(slotArray[i]); |
| } |
| out.write(dataArea.getByteArray(), dataArea.getStartOffset(), dataArea.getLength()); |
| } |
| } catch (IOException e) { |
| throw new SystemException(ErrorCode.SYSE0001, e); |
| } |
| } |
| |
| private void addItem(final IPointable p) throws SystemException { |
| try { |
| dataArea.getDataOutput().write(p.getByteArray(), p.getStartOffset(), p.getLength()); |
| slots.append(dataArea.getLength()); |
| } catch (IOException e) { |
| throw new SystemException(ErrorCode.SYSE0001, e); |
| } |
| } |
| }; |
| } |
| } |