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* 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.
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package org.apache.vxquery.runtime.functions.aggregate;
import org.apache.vxquery.context.DynamicContext;
import org.apache.vxquery.datamodel.accessors.SequencePointable;
import org.apache.vxquery.datamodel.accessors.TaggedValuePointable;
import org.apache.vxquery.datamodel.accessors.TypedPointables;
import org.apache.vxquery.datamodel.values.ValueTag;
import org.apache.vxquery.datamodel.values.XDMConstants;
import org.apache.vxquery.exceptions.SystemException;
import org.apache.vxquery.runtime.functions.base.AbstractTaggedValueArgumentScalarEvaluator;
import org.apache.vxquery.runtime.functions.base.AbstractTaggedValueArgumentScalarEvaluatorFactory;
import org.apache.vxquery.runtime.functions.comparison.AbstractValueComparisonOperation;
import org.apache.vxquery.runtime.functions.util.FunctionHelper;
import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException;
import edu.uci.ics.hyracks.algebricks.runtime.base.IScalarEvaluator;
import edu.uci.ics.hyracks.algebricks.runtime.base.IScalarEvaluatorFactory;
import edu.uci.ics.hyracks.api.context.IHyracksTaskContext;
import edu.uci.ics.hyracks.data.std.api.IPointable;
import edu.uci.ics.hyracks.data.std.primitive.VoidPointable;
public abstract class AbstractMaxMinScalarEvaluatorFactory extends AbstractTaggedValueArgumentScalarEvaluatorFactory {
private static final long serialVersionUID = 1L;
public AbstractMaxMinScalarEvaluatorFactory(IScalarEvaluatorFactory[] args) {
super(args);
}
@Override
protected IScalarEvaluator createEvaluator(IHyracksTaskContext ctx, IScalarEvaluator[] args)
throws AlgebricksException {
final DynamicContext dCtx = (DynamicContext) ctx.getJobletContext().getGlobalJobData();
final SequencePointable seqp = (SequencePointable) SequencePointable.FACTORY.createPointable();
final AbstractValueComparisonOperation aOp = createValueComparisonOperation();
final TaggedValuePointable tvpReturn = (TaggedValuePointable) TaggedValuePointable.FACTORY.createPointable();
final TaggedValuePointable tvpNext = (TaggedValuePointable) TaggedValuePointable.FACTORY.createPointable();
final VoidPointable p = (VoidPointable) VoidPointable.FACTORY.createPointable();
final TypedPointables tp1 = new TypedPointables();
final TypedPointables tp2 = new TypedPointables();
return new AbstractTaggedValueArgumentScalarEvaluator(args) {
@Override
protected void evaluate(TaggedValuePointable[] args, IPointable result) throws SystemException {
// TODO Update the results to be based on specs when different types in sequence.
TaggedValuePointable tvp = args[0];
if (tvp.getTag() == ValueTag.SEQUENCE_TAG) {
tvp.getValue(seqp);
int seqLen = seqp.getEntryCount();
if (seqLen == 0) {
XDMConstants.setEmptySequence(result);
} else {
for (int j = 0; j < seqLen; ++j) {
seqp.getEntry(j, p);
tvpNext.set(p.getByteArray(), p.getStartOffset(), p.getLength());
if (j == 0) {
// Init.
tvpReturn.set(tvpNext);
}
if (FunctionHelper.transformThenCompareMinMaxTaggedValues(aOp, tvpNext, tvpReturn, dCtx, tp1, tp2)) {
tvpReturn.set(tvpNext);
}
}
result.set(tvpReturn);
}
} else {
result.set(tvp);
}
}
};
}
protected abstract AbstractValueComparisonOperation createValueComparisonOperation();
}