| /* |
| * 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.core.algebra.runtime.evaluators; |
| |
| import java.io.DataOutput; |
| import java.io.IOException; |
| |
| import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IEvaluator; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.runtime.base.IEvaluatorFactory; |
| import edu.uci.ics.hyracks.algebricks.core.api.exceptions.AlgebricksException; |
| import edu.uci.ics.hyracks.dataflow.common.data.accessors.IDataOutputProvider; |
| import edu.uci.ics.hyracks.dataflow.common.data.accessors.IFrameTupleReference; |
| |
| public class ConstantEvalFactory implements IEvaluatorFactory { |
| private static final long serialVersionUID = 1L; |
| |
| private byte[] value; |
| |
| public ConstantEvalFactory(byte[] value) { |
| this.value = value; |
| } |
| |
| @Override |
| public String toString() { |
| return "Constant"; |
| } |
| |
| @Override |
| public IEvaluator createEvaluator(final IDataOutputProvider output) throws AlgebricksException { |
| return new IEvaluator() { |
| |
| private DataOutput out = output.getDataOutput(); |
| |
| @Override |
| public void evaluate(IFrameTupleReference tuple) throws AlgebricksException { |
| try { |
| out.write(value, 0, value.length); |
| } catch (IOException ioe) { |
| throw new AlgebricksException(ioe); |
| } |
| } |
| }; |
| } |
| |
| } |