| /* |
| * Copyright 2009-2013 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.asterix.runtime.evaluators.functions; |
| |
| import java.io.DataOutput; |
| import java.io.IOException; |
| |
| import edu.uci.ics.asterix.builders.RecordBuilder; |
| import edu.uci.ics.asterix.common.exceptions.AsterixException; |
| import edu.uci.ics.asterix.om.functions.AsterixBuiltinFunctions; |
| import edu.uci.ics.asterix.om.functions.IFunctionDescriptor; |
| import edu.uci.ics.asterix.om.functions.IFunctionDescriptorFactory; |
| import edu.uci.ics.asterix.om.types.ARecordType; |
| import edu.uci.ics.asterix.om.types.ATypeTag; |
| import edu.uci.ics.asterix.runtime.evaluators.base.AbstractScalarFunctionDynamicDescriptor; |
| import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.functions.FunctionIdentifier; |
| import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluator; |
| import edu.uci.ics.hyracks.algebricks.runtime.base.ICopyEvaluatorFactory; |
| import edu.uci.ics.hyracks.data.std.api.IDataOutputProvider; |
| import edu.uci.ics.hyracks.data.std.util.ArrayBackedValueStorage; |
| import edu.uci.ics.hyracks.dataflow.common.data.accessors.IFrameTupleReference; |
| |
| public class OpenRecordConstructorDescriptor extends AbstractScalarFunctionDynamicDescriptor { |
| |
| public static final IFunctionDescriptorFactory FACTORY = new IFunctionDescriptorFactory() { |
| public IFunctionDescriptor createFunctionDescriptor() { |
| return new OpenRecordConstructorDescriptor(); |
| } |
| }; |
| |
| private static final long serialVersionUID = 1L; |
| private ARecordType recType; |
| private boolean[] openFields; |
| |
| public void reset(ARecordType recType, boolean[] openFields) { |
| this.recType = recType; |
| this.openFields = openFields; |
| } |
| |
| @Override |
| public FunctionIdentifier getIdentifier() { |
| return AsterixBuiltinFunctions.OPEN_RECORD_CONSTRUCTOR; |
| } |
| |
| @Override |
| public ICopyEvaluatorFactory createEvaluatorFactory(final ICopyEvaluatorFactory[] args) { |
| return new ICopyEvaluatorFactory() { |
| private static final long serialVersionUID = 1L; |
| |
| @Override |
| public ICopyEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException { |
| int n = args.length / 2; |
| final ICopyEvaluator[] evalNames = new ICopyEvaluator[n]; |
| final ICopyEvaluator[] evalFields = new ICopyEvaluator[n]; |
| final ArrayBackedValueStorage fieldNameBuffer = new ArrayBackedValueStorage(); |
| final ArrayBackedValueStorage fieldValueBuffer = new ArrayBackedValueStorage(); |
| for (int i = 0; i < n; i++) { |
| evalNames[i] = args[2 * i].createEvaluator(fieldNameBuffer); |
| evalFields[i] = args[2 * i + 1].createEvaluator(fieldValueBuffer); |
| } |
| final DataOutput out = output.getDataOutput(); |
| return new ICopyEvaluator() { |
| private RecordBuilder recBuilder = new RecordBuilder(); |
| private int closedFieldId; |
| private boolean first = true; |
| |
| @Override |
| public void evaluate(IFrameTupleReference tuple) throws AlgebricksException { |
| try { |
| closedFieldId = 0; |
| if (first) { |
| first = false; |
| recBuilder.reset(recType); |
| } |
| recBuilder.init(); |
| for (int i = 0; i < evalFields.length; i++) { |
| fieldValueBuffer.reset(); |
| evalFields[i].evaluate(tuple); |
| if (openFields[i]) { |
| fieldNameBuffer.reset(); |
| evalNames[i].evaluate(tuple); |
| recBuilder.addField(fieldNameBuffer, fieldValueBuffer); |
| } else { |
| if (fieldValueBuffer.getByteArray()[0] != ATypeTag.NULL.serialize()) { |
| recBuilder.addField(closedFieldId, fieldValueBuffer); |
| } |
| closedFieldId++; |
| } |
| } |
| recBuilder.write(out, true); |
| } catch (IOException | AsterixException e) { |
| throw new AlgebricksException(e); |
| } |
| } |
| }; |
| } |
| }; |
| } |
| } |