| /* |
| * 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.std.group; |
| |
| import java.nio.ByteBuffer; |
| |
| import edu.uci.ics.hyracks.api.comm.FrameHelper; |
| import edu.uci.ics.hyracks.api.exceptions.HyracksDataException; |
| import edu.uci.ics.hyracks.dataflow.common.comm.io.ArrayTupleBuilder; |
| |
| /** |
| * |
| */ |
| public class FrameToolsForGroupers { |
| |
| public static void writeFields(byte[] buf, int offset, int length, ArrayTupleBuilder tupleBuilder) |
| throws HyracksDataException { |
| writeFields(buf, offset, length, tupleBuilder.getFieldEndOffsets(), tupleBuilder.getByteArray(), 0, |
| tupleBuilder.getSize()); |
| } |
| |
| public static void writeFields(byte[] buf, int offset, int length, int[] fieldsOffset, byte[] data, int dataOffset, |
| int dataLength) throws HyracksDataException { |
| if (dataLength + 4 * fieldsOffset.length > length) { |
| throw new HyracksDataException("Out of buffer bound: try to write too much data (" + dataLength |
| + ") to the given bound (" + length + ")."); |
| } |
| |
| ByteBuffer buffer = ByteBuffer.wrap(buf, offset, length); |
| for (int i = 0; i < fieldsOffset.length; i++) { |
| buffer.putInt(fieldsOffset[i]); |
| } |
| buffer.put(data, dataOffset, dataLength); |
| } |
| |
| public static void updateFrameMetaForNewTuple(ByteBuffer buffer, int addedTupleLength) throws HyracksDataException { |
| int currentTupleCount = buffer.getInt(FrameHelper.getTupleCountOffset(buffer.capacity())); |
| int currentTupleEndOffset = buffer.getInt(FrameHelper.getTupleCountOffset(buffer.capacity()) - 4 |
| * currentTupleCount); |
| int newTupleEndOffset = currentTupleEndOffset + addedTupleLength; |
| |
| // update tuple end offset |
| buffer.putInt(FrameHelper.getTupleCountOffset(buffer.capacity()) - 4 * (currentTupleCount + 1), |
| newTupleEndOffset); |
| // Update the tuple count |
| buffer.putInt(FrameHelper.getTupleCountOffset(buffer.capacity()), currentTupleCount + 1); |
| } |
| |
| public static void updateFrameMetaForNewTuple(ByteBuffer buffer, int addedTupleLength, boolean isReset) |
| throws HyracksDataException { |
| int currentTupleCount; |
| int currentTupleEndOffset; |
| if (isReset) { |
| currentTupleCount = 0; |
| currentTupleEndOffset = 0; |
| } else { |
| currentTupleCount = buffer.getInt(FrameHelper.getTupleCountOffset(buffer.capacity())); |
| currentTupleEndOffset = buffer.getInt(FrameHelper.getTupleCountOffset(buffer.capacity()) - 4 |
| * currentTupleCount); |
| } |
| int newTupleEndOffset = currentTupleEndOffset + addedTupleLength; |
| |
| // update tuple end offset |
| buffer.putInt(FrameHelper.getTupleCountOffset(buffer.capacity()) - 4 * (currentTupleCount + 1), |
| newTupleEndOffset); |
| // Update the tuple count |
| buffer.putInt(FrameHelper.getTupleCountOffset(buffer.capacity()), currentTupleCount + 1); |
| } |
| |
| public static boolean isFrameOverflowing(ByteBuffer buffer, int length, boolean isReset) |
| throws HyracksDataException { |
| |
| int currentTupleCount = buffer.getInt(FrameHelper.getTupleCountOffset(buffer.capacity())); |
| if (currentTupleCount == 0 || isReset) { |
| return length + 4 + 4 > buffer.capacity(); |
| } |
| int currentTupleEndOffset = buffer.getInt(FrameHelper.getTupleCountOffset(buffer.capacity()) - 4 |
| * currentTupleCount); |
| return currentTupleEndOffset + length + 4 + (currentTupleCount + 1) * 4 > buffer.capacity(); |
| } |
| } |