| /* |
| * 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.dataflow.hadoop.mapreduce; |
| |
| import java.io.IOException; |
| import java.nio.ByteBuffer; |
| import java.util.List; |
| |
| import org.apache.hadoop.io.DataInputBuffer; |
| import org.apache.hadoop.mapred.RawKeyValueIterator; |
| import org.apache.hadoop.util.Progress; |
| |
| import edu.uci.ics.hyracks.api.context.IHyracksTaskContext; |
| import edu.uci.ics.hyracks.api.dataflow.value.RecordDescriptor; |
| import edu.uci.ics.hyracks.dataflow.common.comm.io.FrameTupleAccessor; |
| import edu.uci.ics.hyracks.dataflow.common.comm.util.FrameUtils; |
| |
| public class KVIterator implements RawKeyValueIterator { |
| private final HadoopHelper helper; |
| private FrameTupleAccessor accessor; |
| private DataInputBuffer kBuffer; |
| private DataInputBuffer vBuffer; |
| private List<ByteBuffer> buffers; |
| private int bSize; |
| private int bPtr; |
| private int tIdx; |
| private boolean eog; |
| |
| public KVIterator(IHyracksTaskContext ctx, HadoopHelper helper, RecordDescriptor recordDescriptor) { |
| this.helper = helper; |
| accessor = new FrameTupleAccessor(ctx.getFrameSize(), recordDescriptor); |
| kBuffer = new DataInputBuffer(); |
| vBuffer = new DataInputBuffer(); |
| } |
| |
| void reset(List<ByteBuffer> buffers, int bSize) { |
| this.buffers = buffers; |
| this.bSize = bSize; |
| bPtr = 0; |
| tIdx = 0; |
| eog = false; |
| if (bSize > 0) { |
| accessor.reset(buffers.get(0)); |
| tIdx = -1; |
| } else { |
| eog = true; |
| } |
| } |
| |
| @Override |
| public DataInputBuffer getKey() throws IOException { |
| return kBuffer; |
| } |
| |
| @Override |
| public DataInputBuffer getValue() throws IOException { |
| return vBuffer; |
| } |
| |
| @Override |
| public boolean next() throws IOException { |
| while (true) { |
| if (eog) { |
| return false; |
| } |
| ++tIdx; |
| if (accessor.getTupleCount() <= tIdx) { |
| ++bPtr; |
| if (bPtr >= bSize) { |
| eog = true; |
| continue; |
| } |
| tIdx = -1; |
| accessor.reset(buffers.get(bPtr)); |
| continue; |
| } |
| kBuffer.reset(accessor.getBuffer().array(), |
| FrameUtils.getAbsoluteFieldStartOffset(accessor, tIdx, helper.KEY_FIELD_INDEX), |
| accessor.getFieldLength(tIdx, helper.KEY_FIELD_INDEX)); |
| vBuffer.reset(accessor.getBuffer().array(), |
| FrameUtils.getAbsoluteFieldStartOffset(accessor, tIdx, helper.VALUE_FIELD_INDEX), |
| accessor.getFieldLength(tIdx, helper.VALUE_FIELD_INDEX)); |
| break; |
| } |
| return true; |
| } |
| |
| @Override |
| public void close() throws IOException { |
| |
| } |
| |
| @Override |
| public Progress getProgress() { |
| return null; |
| } |
| } |