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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.comparison;
import java.io.DataOutput;
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.ErrorCode;
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.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.LongPointable;
import edu.uci.ics.hyracks.data.std.util.ArrayBackedValueStorage;
public abstract class AbstractValueComparisonScalarEvaluatorFactory extends
AbstractTaggedValueArgumentScalarEvaluatorFactory {
private static final long serialVersionUID = 1L;
public AbstractValueComparisonScalarEvaluatorFactory(IScalarEvaluatorFactory[] args) {
super(args);
}
@Override
protected IScalarEvaluator createEvaluator(IHyracksTaskContext ctx, IScalarEvaluator[] args)
throws AlgebricksException {
final ArrayBackedValueStorage abvs = new ArrayBackedValueStorage();
final DataOutput dOut = abvs.getDataOutput();
final AbstractValueComparisonOperation aOp = createValueComparisonOperation();
final DynamicContext dCtx = (DynamicContext) ctx.getJobletContext().getGlobalJobData();
final SequencePointable seqp = (SequencePointable) SequencePointable.FACTORY.createPointable();
final ArrayBackedValueStorage abvsInteger1 = new ArrayBackedValueStorage();
final DataOutput dOutInteger1 = abvsInteger1.getDataOutput();
final ArrayBackedValueStorage abvsInteger2 = new ArrayBackedValueStorage();
final DataOutput dOutInteger2 = abvsInteger2.getDataOutput();
final TaggedValuePointable tvp1new = (TaggedValuePointable) TaggedValuePointable.FACTORY.createPointable();
final TaggedValuePointable tvp2new = (TaggedValuePointable) TaggedValuePointable.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 {
TaggedValuePointable tvp1 = args[0];
TaggedValuePointable tvp2 = args[1];
if (tvp1.getTag() == ValueTag.SEQUENCE_TAG) {
tvp1.getValue(seqp);
if (seqp.getEntryCount() == 0) {
XDMConstants.setEmptySequence(result);
return;
}
throw new SystemException(ErrorCode.XPTY0004);
}
if (tvp2.getTag() == ValueTag.SEQUENCE_TAG) {
tvp2.getValue(seqp);
if (seqp.getEntryCount() == 0) {
XDMConstants.setEmptySequence(result);
return;
}
throw new SystemException(ErrorCode.XPTY0004);
}
boolean booleanResult = transformThenCompareTaggedValues(aOp, tvp1, tvp2, dCtx);
try {
abvs.reset();
dOut.write(ValueTag.XS_BOOLEAN_TAG);
dOut.write(booleanResult ? 1 : 0);
result.set(abvs);
} catch (Exception e) {
throw new SystemException(ErrorCode.SYSE0001, e);
}
}
protected boolean transformThenCompareTaggedValues(AbstractValueComparisonOperation aOp,
TaggedValuePointable tvp1, TaggedValuePointable tvp2, DynamicContext dCtx) throws SystemException {
try {
if (tvp1.getTag() == ValueTag.XS_UNTYPED_ATOMIC_TAG) {
// Only need to change tag since the storage is the same for untyped atomic and string.
tvp1.getByteArray()[0] = ValueTag.XS_STRING_TAG;
tvp1new.set(tvp1);
} else if (FunctionHelper.isDerivedFromInteger(tvp1.getTag())) {
abvsInteger1.reset();
FunctionHelper.getIntegerPointable(tvp1, dOutInteger1, tp1);
tvp1new.set(abvsInteger1.getByteArray(), abvsInteger1.getStartOffset(),
LongPointable.TYPE_TRAITS.getFixedLength() + 1);
} else {
tvp1new.set(tvp1);
}
if (tvp2.getTag() == ValueTag.XS_UNTYPED_ATOMIC_TAG) {
// Only need to change tag since the storage is the same for untyped atomic and string.
tvp2.getByteArray()[0] = ValueTag.XS_STRING_TAG;
tvp2new.set(tvp2);
} else if (FunctionHelper.isDerivedFromInteger(tvp2.getTag())) {
abvsInteger2.reset();
FunctionHelper.getIntegerPointable(tvp2, dOutInteger2, tp2);
tvp2new.set(abvsInteger2.getByteArray(), abvsInteger2.getStartOffset(),
LongPointable.TYPE_TRAITS.getFixedLength() + 1);
} else {
tvp2new.set(tvp2);
}
return FunctionHelper.compareTaggedValues(aOp, tvp1new, tvp2new, dCtx, tp1, tp2);
} catch (SystemException se) {
throw se;
} catch (Exception e) {
throw new SystemException(ErrorCode.SYSE0001, e);
}
}
};
}
protected abstract AbstractValueComparisonOperation createValueComparisonOperation();
}