| /* |
| * 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.pregelix.dataflow.std; |
| |
| import java.io.DataOutput; |
| import java.io.IOException; |
| import java.nio.ByteBuffer; |
| |
| import edu.uci.ics.hyracks.api.context.IHyracksTaskContext; |
| import edu.uci.ics.hyracks.api.dataflow.IOperatorNodePushable; |
| import edu.uci.ics.hyracks.api.dataflow.value.IRecordDescriptorProvider; |
| import edu.uci.ics.hyracks.api.dataflow.value.RecordDescriptor; |
| import edu.uci.ics.hyracks.api.exceptions.HyracksDataException; |
| import edu.uci.ics.hyracks.api.job.JobSpecification; |
| import edu.uci.ics.hyracks.dataflow.common.comm.io.ArrayTupleBuilder; |
| import edu.uci.ics.hyracks.dataflow.common.comm.io.FrameTupleAccessor; |
| import edu.uci.ics.hyracks.dataflow.common.comm.io.FrameTupleAppender; |
| import edu.uci.ics.hyracks.dataflow.common.comm.util.FrameUtils; |
| import edu.uci.ics.hyracks.dataflow.std.base.AbstractSingleActivityOperatorDescriptor; |
| import edu.uci.ics.hyracks.dataflow.std.base.AbstractUnaryInputUnaryOutputOperatorNodePushable; |
| |
| public class ProjectOperatorDescriptor extends AbstractSingleActivityOperatorDescriptor { |
| private static final long serialVersionUID = 1L; |
| private final int[] projectFields; |
| |
| public ProjectOperatorDescriptor(JobSpecification spec, RecordDescriptor rDesc, int projectFields[]) { |
| super(spec, 1, 1); |
| this.recordDescriptors[0] = rDesc; |
| this.projectFields = projectFields; |
| } |
| |
| @Override |
| public IOperatorNodePushable createPushRuntime(final IHyracksTaskContext ctx, |
| final IRecordDescriptorProvider recordDescProvider, int partition, int nPartitions) |
| throws HyracksDataException { |
| return new AbstractUnaryInputUnaryOutputOperatorNodePushable() { |
| private final RecordDescriptor rd0 = recordDescProvider.getInputRecordDescriptor(getActivityId(), 0); |
| private final FrameTupleAccessor fta = new FrameTupleAccessor(ctx.getFrameSize(), rd0); |
| private final FrameTupleAppender appender = new FrameTupleAppender(ctx.getFrameSize()); |
| private final ArrayTupleBuilder tb = new ArrayTupleBuilder(projectFields.length); |
| private final DataOutput dos = tb.getDataOutput(); |
| private final ByteBuffer writeBuffer = ctx.allocateFrame(); |
| |
| @Override |
| public void close() throws HyracksDataException { |
| if (appender.getTupleCount() > 0) |
| FrameUtils.flushFrame(writeBuffer, writer); |
| writer.close(); |
| } |
| |
| @Override |
| public void fail() throws HyracksDataException { |
| writer.fail(); |
| } |
| |
| @Override |
| public void nextFrame(ByteBuffer frame) throws HyracksDataException { |
| fta.reset(frame); |
| int tupleCount = fta.getTupleCount(); |
| try { |
| for (int tIndex = 0; tIndex < tupleCount; tIndex++) { |
| tb.reset(); |
| for (int j = 0; j < projectFields.length; j++) { |
| int fIndex = projectFields[j]; |
| int tupleStart = fta.getTupleStartOffset(tIndex); |
| int fieldStart = fta.getFieldStartOffset(tIndex, fIndex); |
| int offset = fta.getFieldSlotsLength() + tupleStart + fieldStart; |
| int len = fta.getFieldEndOffset(tIndex, fIndex) - fieldStart; |
| dos.write(fta.getBuffer().array(), offset, len); |
| tb.addFieldEndOffset(); |
| } |
| if (!appender.append(tb.getFieldEndOffsets(), tb.getByteArray(), 0, tb.getSize())) { |
| FrameUtils.flushFrame(writeBuffer, writer); |
| appender.reset(writeBuffer, true); |
| if (!appender.append(tb.getFieldEndOffsets(), tb.getByteArray(), 0, tb.getSize())) { |
| throw new IllegalStateException(); |
| } |
| } |
| } |
| } catch (IOException e) { |
| throw new HyracksDataException(e); |
| } |
| } |
| |
| @Override |
| public void open() throws HyracksDataException { |
| writer.open(); |
| appender.reset(writeBuffer, true); |
| } |
| |
| }; |
| } |
| } |