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JZarr is a Java library providing an implementation of chunked, compressed, N-dimensional arrays close to the zarr-python package.
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/*
 *
 * MIT License
 *
 * Copyright (c) 2020. Brockmann Consult GmbH ([email protected])
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 */
package com.bc.zarr.chunk;

import com.bc.zarr.Compressor;
import com.bc.zarr.storage.Store;
import ucar.ma2.Array;
import ucar.ma2.DataType;

import javax.imageio.stream.ImageInputStream;
import javax.imageio.stream.ImageOutputStream;
import javax.imageio.stream.MemoryCacheImageInputStream;
import javax.imageio.stream.MemoryCacheImageOutputStream;
import java.io.*;
import java.nio.ByteOrder;

public class ChunkReaderWriterImpl_Double extends ChunkReaderWriter {

    public ChunkReaderWriterImpl_Double(ByteOrder order, Compressor compressor, int[] chunkShape, Number fill, Store store) {
        super(order, compressor, chunkShape, fill, store);
    }

    @Override
    public Array read(String storeKey) throws IOException {
        try (
                InputStream is = store.getInputStream(storeKey)
        ) {
            if (is != null) {
                try (
                        final ByteArrayOutputStream os = new ByteArrayOutputStream()
                ) {
                    compressor.uncompress(is, os);
                    final double[] doubles = new double[getSize()];
                    try (
                            final ByteArrayInputStream bais = new ByteArrayInputStream(os.toByteArray());
                            final ImageInputStream iis = new MemoryCacheImageInputStream(bais)
                    ) {
                        iis.setByteOrder(order);
                        iis.readFully(doubles, 0, doubles.length);
                    }
                    return Array.factory(DataType.DOUBLE, chunkShape, doubles);
                }
            } else {
                return createFilled(DataType.DOUBLE);
            }
        }
    }

    @Override
    public void write(String storeKey, Array array) throws IOException {
        try (
                final ImageOutputStream iis = new MemoryCacheImageOutputStream(new ByteArrayOutputStream());
                final InputStream is = new ZarrInputStreamAdapter(iis);
                final OutputStream os = store.getOutputStream(storeKey)
        ) {
            final double[] doubles = (double[]) array.get1DJavaArray(DataType.DOUBLE);
            iis.setByteOrder(order);
            iis.writeDoubles(doubles, 0, doubles.length);
            iis.seek(0);
            compressor.compress(is, os);
        }
    }
}