| /* |
| * 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.tests.pushruntime; |
| |
| import java.io.IOException; |
| |
| import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException; |
| import edu.uci.ics.hyracks.algebricks.runtime.base.IUnnestingEvaluator; |
| import edu.uci.ics.hyracks.algebricks.runtime.base.IUnnestingEvaluatorFactory; |
| import edu.uci.ics.hyracks.api.context.IHyracksTaskContext; |
| import edu.uci.ics.hyracks.data.std.api.IPointable; |
| import edu.uci.ics.hyracks.data.std.util.ArrayBackedValueStorage; |
| import edu.uci.ics.hyracks.dataflow.common.data.accessors.IFrameTupleReference; |
| |
| public class IntArrayUnnester implements IUnnestingEvaluatorFactory { |
| |
| private int[] x; |
| |
| public IntArrayUnnester(int[] x) { |
| this.x = x; |
| } |
| |
| private static final long serialVersionUID = 1L; |
| |
| @Override |
| public IUnnestingEvaluator createUnnestingEvaluator(IHyracksTaskContext ctx) throws AlgebricksException { |
| final ArrayBackedValueStorage abvs = new ArrayBackedValueStorage(); |
| return new IUnnestingEvaluator() { |
| |
| private int pos; |
| |
| @Override |
| public void init(IFrameTupleReference tuple) throws AlgebricksException { |
| pos = 0; |
| } |
| |
| @Override |
| public boolean step(IPointable result) throws AlgebricksException { |
| try { |
| if (pos < x.length) { |
| // Writes one byte to distinguish between null |
| // values and end of sequence. |
| abvs.reset(); |
| abvs.getDataOutput().writeInt(x[pos]); |
| result.set(abvs); |
| ++pos; |
| return true; |
| } else { |
| return false; |
| } |
| |
| } catch (IOException e) { |
| throw new AlgebricksException(e); |
| } |
| } |
| |
| }; |
| |
| } |
| |
| } |