| /* |
| * Copyright 2009-2010 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.hyracks.algebricks.runtime.evaluators; |
| |
| 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.dataflow.common.data.accessors.IFrameTupleReference; |
| |
| public class ConstantEvaluatorFactory implements IScalarEvaluatorFactory { |
| private static final long serialVersionUID = 1L; |
| |
| private byte[] value; |
| |
| public ConstantEvaluatorFactory(byte[] value) { |
| this.value = value; |
| } |
| |
| @Override |
| public String toString() { |
| return "Constant"; |
| } |
| |
| @Override |
| public IScalarEvaluator createScalarEvaluator(IHyracksTaskContext ctx) throws AlgebricksException { |
| return new IScalarEvaluator() { |
| @Override |
| public void evaluate(IFrameTupleReference tuple, IPointable result) throws AlgebricksException { |
| result.set(value, 0, value.length); |
| } |
| }; |
| } |
| |
| } |