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| <h2 title="Class AbstractCompressionCodec" class="title">Class AbstractCompressionCodec</h2> |
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| <dt>All Implemented Interfaces:</dt> |
| <dd><a href="../../../../../org/apache/arrow/vector/compression/CompressionCodec.html" title="interface in org.apache.arrow.vector.compression">CompressionCodec</a></dd> |
| </dl> |
| <dl> |
| <dt>Direct Known Subclasses:</dt> |
| <dd><a href="../../../../../org/apache/arrow/compression/Lz4CompressionCodec.html" title="class in org.apache.arrow.compression">Lz4CompressionCodec</a>, <a href="../../../../../org/apache/arrow/compression/ZstdCompressionCodec.html" title="class in org.apache.arrow.compression">ZstdCompressionCodec</a></dd> |
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| <pre>public abstract class <span class="typeNameLabel">AbstractCompressionCodec</span> |
| extends <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html?is-external=true" title="class or interface in java.lang">Object</a> |
| implements <a href="../../../../../org/apache/arrow/vector/compression/CompressionCodec.html" title="interface in org.apache.arrow.vector.compression">CompressionCodec</a></pre> |
| <div class="block">The base class for concrete compression codecs, providing |
| common logic for all compression codecs.</div> |
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| <h3>Nested classes/interfaces inherited from interface org.apache.arrow.vector.compression.<a href="../../../../../org/apache/arrow/vector/compression/CompressionCodec.html" title="interface in org.apache.arrow.vector.compression">CompressionCodec</a></h3> |
| <code><a href="../../../../../org/apache/arrow/vector/compression/CompressionCodec.Factory.html" title="interface in org.apache.arrow.vector.compression">CompressionCodec.Factory</a></code></li> |
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| <td class="colOne"><code><span class="memberNameLink"><a href="../../../../../org/apache/arrow/vector/compression/AbstractCompressionCodec.html#AbstractCompressionCodec--">AbstractCompressionCodec</a></span>()</code> </td> |
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| <td class="colFirst"><code><a href="../../../../../org/apache/arrow/memory/ArrowBuf.html" title="class in org.apache.arrow.memory">ArrowBuf</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/arrow/vector/compression/AbstractCompressionCodec.html#compress-org.apache.arrow.memory.BufferAllocator-org.apache.arrow.memory.ArrowBuf-">compress</a></span>(<a href="../../../../../org/apache/arrow/memory/BufferAllocator.html" title="interface in org.apache.arrow.memory">BufferAllocator</a> allocator, |
| <a href="../../../../../org/apache/arrow/memory/ArrowBuf.html" title="class in org.apache.arrow.memory">ArrowBuf</a> uncompressedBuffer)</code> |
| <div class="block">Compress a buffer.</div> |
| </td> |
| </tr> |
| <tr id="i1" class="rowColor"> |
| <td class="colFirst"><code><a href="../../../../../org/apache/arrow/memory/ArrowBuf.html" title="class in org.apache.arrow.memory">ArrowBuf</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/arrow/vector/compression/AbstractCompressionCodec.html#decompress-org.apache.arrow.memory.BufferAllocator-org.apache.arrow.memory.ArrowBuf-">decompress</a></span>(<a href="../../../../../org/apache/arrow/memory/BufferAllocator.html" title="interface in org.apache.arrow.memory">BufferAllocator</a> allocator, |
| <a href="../../../../../org/apache/arrow/memory/ArrowBuf.html" title="class in org.apache.arrow.memory">ArrowBuf</a> compressedBuffer)</code> |
| <div class="block">Decompress a buffer.</div> |
| </td> |
| </tr> |
| <tr id="i2" class="altColor"> |
| <td class="colFirst"><code>protected abstract <a href="../../../../../org/apache/arrow/memory/ArrowBuf.html" title="class in org.apache.arrow.memory">ArrowBuf</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/arrow/vector/compression/AbstractCompressionCodec.html#doCompress-org.apache.arrow.memory.BufferAllocator-org.apache.arrow.memory.ArrowBuf-">doCompress</a></span>(<a href="../../../../../org/apache/arrow/memory/BufferAllocator.html" title="interface in org.apache.arrow.memory">BufferAllocator</a> allocator, |
| <a href="../../../../../org/apache/arrow/memory/ArrowBuf.html" title="class in org.apache.arrow.memory">ArrowBuf</a> uncompressedBuffer)</code> |
| <div class="block">The method that actually performs the data compression.</div> |
| </td> |
| </tr> |
| <tr id="i3" class="rowColor"> |
| <td class="colFirst"><code>protected abstract <a href="../../../../../org/apache/arrow/memory/ArrowBuf.html" title="class in org.apache.arrow.memory">ArrowBuf</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/arrow/vector/compression/AbstractCompressionCodec.html#doDecompress-org.apache.arrow.memory.BufferAllocator-org.apache.arrow.memory.ArrowBuf-">doDecompress</a></span>(<a href="../../../../../org/apache/arrow/memory/BufferAllocator.html" title="interface in org.apache.arrow.memory">BufferAllocator</a> allocator, |
| <a href="../../../../../org/apache/arrow/memory/ArrowBuf.html" title="class in org.apache.arrow.memory">ArrowBuf</a> compressedBuffer)</code> |
| <div class="block">The method that actually performs the data decompression.</div> |
| </td> |
| </tr> |
| <tr id="i4" class="altColor"> |
| <td class="colFirst"><code>protected long</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/arrow/vector/compression/AbstractCompressionCodec.html#readUncompressedLength-org.apache.arrow.memory.ArrowBuf-">readUncompressedLength</a></span>(<a href="../../../../../org/apache/arrow/memory/ArrowBuf.html" title="class in org.apache.arrow.memory">ArrowBuf</a> compressedBuffer)</code> </td> |
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| <td class="colFirst"><code>protected void</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../../org/apache/arrow/vector/compression/AbstractCompressionCodec.html#writeUncompressedLength-org.apache.arrow.memory.ArrowBuf-long-">writeUncompressedLength</a></span>(<a href="../../../../../org/apache/arrow/memory/ArrowBuf.html" title="class in org.apache.arrow.memory">ArrowBuf</a> compressedBuffer, |
| long uncompressedLength)</code> </td> |
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| <h3>Methods inherited from interface org.apache.arrow.vector.compression.<a href="../../../../../org/apache/arrow/vector/compression/CompressionCodec.html" title="interface in org.apache.arrow.vector.compression">CompressionCodec</a></h3> |
| <code><a href="../../../../../org/apache/arrow/vector/compression/CompressionCodec.html#getCodecType--">getCodecType</a></code></li> |
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| <h4>AbstractCompressionCodec</h4> |
| <pre>public AbstractCompressionCodec()</pre> |
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| <h4>compress</h4> |
| <pre>public <a href="../../../../../org/apache/arrow/memory/ArrowBuf.html" title="class in org.apache.arrow.memory">ArrowBuf</a> compress(<a href="../../../../../org/apache/arrow/memory/BufferAllocator.html" title="interface in org.apache.arrow.memory">BufferAllocator</a> allocator, |
| <a href="../../../../../org/apache/arrow/memory/ArrowBuf.html" title="class in org.apache.arrow.memory">ArrowBuf</a> uncompressedBuffer)</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="../../../../../org/apache/arrow/vector/compression/CompressionCodec.html#compress-org.apache.arrow.memory.BufferAllocator-org.apache.arrow.memory.ArrowBuf-">CompressionCodec</a></code></span></div> |
| <div class="block">Compress a buffer.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../org/apache/arrow/vector/compression/CompressionCodec.html#compress-org.apache.arrow.memory.BufferAllocator-org.apache.arrow.memory.ArrowBuf-">compress</a></code> in interface <code><a href="../../../../../org/apache/arrow/vector/compression/CompressionCodec.html" title="interface in org.apache.arrow.vector.compression">CompressionCodec</a></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>allocator</code> - the allocator for allocating memory for compressed buffer.</dd> |
| <dd><code>uncompressedBuffer</code> - the buffer to compress. |
| Implementation of this method should take care of releasing this buffer.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the compressed buffer</dd> |
| </dl> |
| </li> |
| </ul> |
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| <h4>decompress</h4> |
| <pre>public <a href="../../../../../org/apache/arrow/memory/ArrowBuf.html" title="class in org.apache.arrow.memory">ArrowBuf</a> decompress(<a href="../../../../../org/apache/arrow/memory/BufferAllocator.html" title="interface in org.apache.arrow.memory">BufferAllocator</a> allocator, |
| <a href="../../../../../org/apache/arrow/memory/ArrowBuf.html" title="class in org.apache.arrow.memory">ArrowBuf</a> compressedBuffer)</pre> |
| <div class="block"><span class="descfrmTypeLabel">Description copied from interface: <code><a href="../../../../../org/apache/arrow/vector/compression/CompressionCodec.html#decompress-org.apache.arrow.memory.BufferAllocator-org.apache.arrow.memory.ArrowBuf-">CompressionCodec</a></code></span></div> |
| <div class="block">Decompress a buffer.</div> |
| <dl> |
| <dt><span class="overrideSpecifyLabel">Specified by:</span></dt> |
| <dd><code><a href="../../../../../org/apache/arrow/vector/compression/CompressionCodec.html#decompress-org.apache.arrow.memory.BufferAllocator-org.apache.arrow.memory.ArrowBuf-">decompress</a></code> in interface <code><a href="../../../../../org/apache/arrow/vector/compression/CompressionCodec.html" title="interface in org.apache.arrow.vector.compression">CompressionCodec</a></code></dd> |
| <dt><span class="paramLabel">Parameters:</span></dt> |
| <dd><code>allocator</code> - the allocator for allocating memory for decompressed buffer.</dd> |
| <dd><code>compressedBuffer</code> - the buffer to be decompressed. |
| Implementation of this method should take care of releasing this buffer.</dd> |
| <dt><span class="returnLabel">Returns:</span></dt> |
| <dd>the decompressed buffer.</dd> |
| </dl> |
| </li> |
| </ul> |
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| <pre>protected void writeUncompressedLength(<a href="../../../../../org/apache/arrow/memory/ArrowBuf.html" title="class in org.apache.arrow.memory">ArrowBuf</a> compressedBuffer, |
| long uncompressedLength)</pre> |
| </li> |
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| <pre>protected long readUncompressedLength(<a href="../../../../../org/apache/arrow/memory/ArrowBuf.html" title="class in org.apache.arrow.memory">ArrowBuf</a> compressedBuffer)</pre> |
| </li> |
| </ul> |
| <a name="doCompress-org.apache.arrow.memory.BufferAllocator-org.apache.arrow.memory.ArrowBuf-"> |
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| <h4>doCompress</h4> |
| <pre>protected abstract <a href="../../../../../org/apache/arrow/memory/ArrowBuf.html" title="class in org.apache.arrow.memory">ArrowBuf</a> doCompress(<a href="../../../../../org/apache/arrow/memory/BufferAllocator.html" title="interface in org.apache.arrow.memory">BufferAllocator</a> allocator, |
| <a href="../../../../../org/apache/arrow/memory/ArrowBuf.html" title="class in org.apache.arrow.memory">ArrowBuf</a> uncompressedBuffer)</pre> |
| <div class="block">The method that actually performs the data compression. |
| The layout of the returned compressed buffer is the compressed data, |
| plus 8 bytes reserved at the beginning of the buffer for the uncompressed data size. |
| <p> |
| Please note that this method is not responsible for releasing the uncompressed buffer. |
| </p></div> |
| </li> |
| </ul> |
| <a name="doDecompress-org.apache.arrow.memory.BufferAllocator-org.apache.arrow.memory.ArrowBuf-"> |
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| <h4>doDecompress</h4> |
| <pre>protected abstract <a href="../../../../../org/apache/arrow/memory/ArrowBuf.html" title="class in org.apache.arrow.memory">ArrowBuf</a> doDecompress(<a href="../../../../../org/apache/arrow/memory/BufferAllocator.html" title="interface in org.apache.arrow.memory">BufferAllocator</a> allocator, |
| <a href="../../../../../org/apache/arrow/memory/ArrowBuf.html" title="class in org.apache.arrow.memory">ArrowBuf</a> compressedBuffer)</pre> |
| <div class="block">The method that actually performs the data decompression. |
| The layout of the compressed buffer is the compressed data, |
| plus 8 bytes at the beginning of the buffer storing the uncompressed data size. |
| <p> |
| Please note that this method is not responsible for releasing the compressed buffer. |
| </p></div> |
| </li> |
| </ul> |
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