/*
* 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.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;
import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
import edu.uci.ics.hyracks.algebricks.runtime.base.IAggregateEvaluator;
import edu.uci.ics.hyracks.algebricks.runtime.base.IScalarEvaluator;
import edu.uci.ics.hyracks.algebricks.runtime.base.IScalarEvaluatorFactory;
import edu.uci.ics.hyracks.data.std.api.IPointable;
import edu.uci.ics.hyracks.data.std.primitive.VoidPointable;
import edu.uci.ics.hyracks.data.std.util.ArrayBackedValueStorage;
public class SequenceAggregateEvaluatorFactory extends AbstractTaggedValueArgumentAggregateEvaluatorFactory {
private static final long serialVersionUID = 1L;
public SequenceAggregateEvaluatorFactory(IScalarEvaluatorFactory[] args) {
super(args);
}
@Override
protected IAggregateEvaluator createEvaluator(IScalarEvaluator[] args) throws AlgebricksException {
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 AlgebricksException {
abvs.reset();
slots.clear();
dataArea.reset();
}
@Override
public void finishPartial(IPointable result) throws AlgebricksException {
finish(result);
}
@Override
public void finish(IPointable result) throws AlgebricksException {
if (slots.getSize() != 1) {
try {
assembleResult(abvs, slots, dataArea);
} catch (SystemException e) {
throw new AlgebricksException(e);
}
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);
}
}
};
}
}