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/*
* Copyright 2007 - 2018 ETH Zuerich, CISD and SIS.
*
* 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 at
*
* 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 ch.systemsx.cisd.hdf5;
import java.util.NoSuchElementException;
import hdf.hdf5lib.exceptions.HDF5JavaException;
/**
* A class for computing the parameters of one-dimensional natural blocks.
*
* @author Bernd Rinn
*/
final class HDF5NaturalBlock1DParameters
{
private final int naturalBlockSize;
private final long numberOfBlocks;
private final int lastBlockSize;
final class HDF5NaturalBlock1DIndex
{
private long index = 0;
private long offset;
private int blockSize;
boolean hasNext()
{
return index < numberOfBlocks;
}
long computeOffsetAndSizeGetOffset()
{
if (hasNext() == false)
{
throw new NoSuchElementException();
}
offset = naturalBlockSize * index;
blockSize = (index == numberOfBlocks - 1) ? lastBlockSize : naturalBlockSize;
return offset;
}
int getBlockSize()
{
return blockSize;
}
long getAndIncIndex()
{
return index++;
}
}
HDF5NaturalBlock1DParameters(final HDF5DataSetInformation info)
{
if (info.getRank() > 1)
{
throw new HDF5JavaException("Data Set is expected to be of rank 1 (rank="
+ info.getRank() + ")");
}
final long size = info.getDimensions()[0];
naturalBlockSize =
(info.getStorageLayout() == HDF5StorageLayout.CHUNKED) ? info.tryGetChunkSizes()[0]
: (int) size;
final int sizeModNaturalBlockSize = (int) (size % naturalBlockSize);
numberOfBlocks = (size / naturalBlockSize) + (sizeModNaturalBlockSize != 0 ? 1 : 0);
lastBlockSize = (sizeModNaturalBlockSize != 0) ? sizeModNaturalBlockSize : naturalBlockSize;
}
HDF5NaturalBlock1DIndex getNaturalBlockIndex()
{
return new HDF5NaturalBlock1DIndex();
}
}
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