api/classiceberg_1_1FileIO.html - iceberg-cpp - Git at Google

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   <ul>
 <li class="navelem"><b>iceberg</b></li><li class="navelem"><a class="el" href="classiceberg_1_1FileIO.html">FileIO</a></li>  </ul>
 </div>
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 <div class="header">
   <div class="summary">
 <a href="#pub-methods">Public Member Functions</a> &#124;
 <a href="classiceberg_1_1FileIO-members.html">List of all members</a>  </div>
   <div class="headertitle"><div class="title">iceberg::FileIO Class Reference</div></div>
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 <p>Pluggable module for reading, writing, and deleting files.
  <a href="classiceberg_1_1FileIO.html#details">More...</a></p>

 <p><code>#include &lt;<a class="el" href="file__io_8h_source.html">file_io.h</a>&gt;</code></p>
 <div class="dynheader">
 Inheritance diagram for iceberg::FileIO:</div>
 <div class="dyncontent">
  <div class="center">
   <img src="classiceberg_1_1FileIO.png" usemap="#iceberg::FileIO_map" alt=""/>
   <map id="iceberg::FileIO_map" name="iceberg::FileIO_map">
 <area href="classiceberg_1_1MockFileIO.html" alt="iceberg::MockFileIO" shape="rect" coords="0,56,230,80"/>
 <area href="classiceberg_1_1arrow_1_1ArrowFileSystemFileIO.html" title="A concrete implementation of FileIO for Arrow file system." alt="iceberg::arrow::ArrowFileSystemFileIO" shape="rect" coords="240,56,470,80"/>
 <area href="classiceberg_1_1test_1_1StdFileIO.html" title="Simple local filesystem FileIO implementation for testing." alt="iceberg::test::StdFileIO" shape="rect" coords="480,56,710,80"/>
   </map>
 </div></div>
 <table class="memberdecls">
 <tr class="heading"><td colspan="2"><h2 class="groupheader"><a id="pub-methods" name="pub-methods"></a>
 Public Member Functions</h2></td></tr>
 <tr class="memitem:a714e3babeac9395ed6ef4b2f5c94a5cd" id="r_a714e3babeac9395ed6ef4b2f5c94a5cd"><td class="memItemLeft" align="right" valign="top">virtual Result&lt; std::string &gt;&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classiceberg_1_1FileIO.html#a714e3babeac9395ed6ef4b2f5c94a5cd">ReadFile</a> (const std::string &amp;file_location, std::optional&lt; size_t &gt; length)</td></tr>
 <tr class="memdesc:a714e3babeac9395ed6ef4b2f5c94a5cd"><td class="mdescLeft">&#160;</td><td class="mdescRight">Read the content of the file at the given location.  <br /></td></tr>
 <tr class="separator:a714e3babeac9395ed6ef4b2f5c94a5cd"><td class="memSeparator" colspan="2">&#160;</td></tr>
 <tr class="memitem:a527a78aca1045034250f50a51d8dc0f9" id="r_a527a78aca1045034250f50a51d8dc0f9"><td class="memItemLeft" align="right" valign="top">virtual Status&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classiceberg_1_1FileIO.html#a527a78aca1045034250f50a51d8dc0f9">WriteFile</a> (const std::string &amp;file_location, std::string_view content)</td></tr>
 <tr class="memdesc:a527a78aca1045034250f50a51d8dc0f9"><td class="mdescLeft">&#160;</td><td class="mdescRight">Write the given content to the file at the given location.  <br /></td></tr>
 <tr class="separator:a527a78aca1045034250f50a51d8dc0f9"><td class="memSeparator" colspan="2">&#160;</td></tr>
 <tr class="memitem:ace7c9ec329017d5a99082739e8578937" id="r_ace7c9ec329017d5a99082739e8578937"><td class="memItemLeft" align="right" valign="top">virtual Status&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="classiceberg_1_1FileIO.html#ace7c9ec329017d5a99082739e8578937">DeleteFile</a> (const std::string &amp;file_location)</td></tr>
 <tr class="memdesc:ace7c9ec329017d5a99082739e8578937"><td class="mdescLeft">&#160;</td><td class="mdescRight">Delete a file at the given location.  <br /></td></tr>
 <tr class="separator:ace7c9ec329017d5a99082739e8578937"><td class="memSeparator" colspan="2">&#160;</td></tr>
 </table>
 <a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
 <div class="textblock"><p>Pluggable module for reading, writing, and deleting files. </p>
 <p>This module only handle metadata files, not data files. The metadata files are typically small and are used to store schema, partition information, and other metadata about the table.</p>
 <p>Note that these functions are not atomic. For example, if a write fails, the file may be partially written. Implementations should be careful to avoid corrupting metadata files. </p>
 </div><h2 class="groupheader">Member Function Documentation</h2>
 <a id="ace7c9ec329017d5a99082739e8578937" name="ace7c9ec329017d5a99082739e8578937"></a>
 <h2 class="memtitle"><span class="permalink"><a href="#ace7c9ec329017d5a99082739e8578937">&#9670;&#160;</a></span>DeleteFile()</h2>

 <div class="memitem">
 <div class="memproto">
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   <tr>
   <td class="mlabels-left">
       <table class="memname">
         <tr>
           <td class="memname">virtual Status iceberg::FileIO::DeleteFile </td>
           <td>(</td>
           <td class="paramtype">const std::string &amp;&#160;</td>
           <td class="paramname"><em>file_location</em></td><td>)</td>
           <td></td>
         </tr>
       </table>
   </td>
   <td class="mlabels-right">
 <span class="mlabels"><span class="mlabel">inline</span><span class="mlabel">virtual</span></span>  </td>
   </tr>
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 <p>Delete a file at the given location. </p>
 <dl class="params"><dt>Parameters</dt><dd>
   <table class="params">
     <tr><td class="paramname">file_location</td><td>The location of the file to delete. </td></tr>
   </table>
   </dd>
 </dl>
 <dl class="section return"><dt>Returns</dt><dd>void if the delete succeeded, an error code if the delete failed. </dd></dl>

 <p>Reimplemented in <a class="el" href="classiceberg_1_1arrow_1_1ArrowFileSystemFileIO.html#a054c596530ea55f4e66155c46308ab74">iceberg::arrow::ArrowFileSystemFileIO</a>, and <a class="el" href="classiceberg_1_1test_1_1StdFileIO.html#a1050c568739393ef643f8601086a354e">iceberg::test::StdFileIO</a>.</p>

 </div>
 </div>
 <a id="a714e3babeac9395ed6ef4b2f5c94a5cd" name="a714e3babeac9395ed6ef4b2f5c94a5cd"></a>
 <h2 class="memtitle"><span class="permalink"><a href="#a714e3babeac9395ed6ef4b2f5c94a5cd">&#9670;&#160;</a></span>ReadFile()</h2>

 <div class="memitem">
 <div class="memproto">
 <table class="mlabels">
   <tr>
   <td class="mlabels-left">
       <table class="memname">
         <tr>
           <td class="memname">virtual Result&lt; std::string &gt; iceberg::FileIO::ReadFile </td>
           <td>(</td>
           <td class="paramtype">const std::string &amp;&#160;</td>
           <td class="paramname"><em>file_location</em>, </td>
         </tr>
         <tr>
           <td class="paramkey"></td>
           <td></td>
           <td class="paramtype">std::optional&lt; size_t &gt;&#160;</td>
           <td class="paramname"><em>length</em>&#160;</td>
         </tr>
         <tr>
           <td></td>
           <td>)</td>
           <td></td><td></td>
         </tr>
       </table>
   </td>
   <td class="mlabels-right">
 <span class="mlabels"><span class="mlabel">inline</span><span class="mlabel">virtual</span></span>  </td>
   </tr>
 </table>
 </div><div class="memdoc">

 <p>Read the content of the file at the given location. </p>
 <dl class="params"><dt>Parameters</dt><dd>
   <table class="params">
     <tr><td class="paramname">file_location</td><td>The location of the file to read. </td></tr>
     <tr><td class="paramname">length</td><td>The number of bytes to read. Some object storage need to specify the length to read, e.g. S3 <code>GetObject</code> has a Range parameter. </td></tr>
   </table>
   </dd>
 </dl>
 <dl class="section return"><dt>Returns</dt><dd>The content of the file if the read succeeded, an error code if the read failed. </dd></dl>

 <p>Reimplemented in <a class="el" href="classiceberg_1_1arrow_1_1ArrowFileSystemFileIO.html#aa023cae7f400db161e6d847c2bf6f2f3">iceberg::arrow::ArrowFileSystemFileIO</a>, and <a class="el" href="classiceberg_1_1test_1_1StdFileIO.html#acd86d18e3fb3a5dc6b86584953ec34f1">iceberg::test::StdFileIO</a>.</p>

 </div>
 </div>
 <a id="a527a78aca1045034250f50a51d8dc0f9" name="a527a78aca1045034250f50a51d8dc0f9"></a>
 <h2 class="memtitle"><span class="permalink"><a href="#a527a78aca1045034250f50a51d8dc0f9">&#9670;&#160;</a></span>WriteFile()</h2>

 <div class="memitem">
 <div class="memproto">
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   <tr>
   <td class="mlabels-left">
       <table class="memname">
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           <td class="memname">virtual Status iceberg::FileIO::WriteFile </td>
           <td>(</td>
           <td class="paramtype">const std::string &amp;&#160;</td>
           <td class="paramname"><em>file_location</em>, </td>
         </tr>
         <tr>
           <td class="paramkey"></td>
           <td></td>
           <td class="paramtype">std::string_view&#160;</td>
           <td class="paramname"><em>content</em>&#160;</td>
         </tr>
         <tr>
           <td></td>
           <td>)</td>
           <td></td><td></td>
         </tr>
       </table>
   </td>
   <td class="mlabels-right">
 <span class="mlabels"><span class="mlabel">inline</span><span class="mlabel">virtual</span></span>  </td>
   </tr>
 </table>
 </div><div class="memdoc">

 <p>Write the given content to the file at the given location. </p>
 <dl class="params"><dt>Parameters</dt><dd>
   <table class="params">
     <tr><td class="paramname">file_location</td><td>The location of the file to write. </td></tr>
     <tr><td class="paramname">content</td><td>The content to write to the file. </td></tr>
     <tr><td class="paramname">overwrite</td><td>If true, overwrite the file if it exists. If false, fail if the file exists. </td></tr>
   </table>
   </dd>
 </dl>
 <dl class="section return"><dt>Returns</dt><dd>void if the write succeeded, an error code if the write failed. </dd></dl>

 <p>Reimplemented in <a class="el" href="classiceberg_1_1arrow_1_1ArrowFileSystemFileIO.html#a989c72cecf8dc2463cc90f947d36ba50">iceberg::arrow::ArrowFileSystemFileIO</a>, and <a class="el" href="classiceberg_1_1test_1_1StdFileIO.html#a42ed781e4a4eedf4538d8e1c8da28680">iceberg::test::StdFileIO</a>.</p>

 </div>
 </div>
 <hr/>The documentation for this class was generated from the following file:<ul>
 <li>iceberg/<a class="el" href="file__io_8h_source.html">file_io.h</a></li>
 </ul>
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	<ul>
	<li class="navelem"><b>iceberg</b></li><li class="navelem"><a class="el" href="classiceberg_1_1FileIO.html">FileIO</a></li> </ul>
	</div>
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	<div class="header">
	<div class="summary">
	<a href="#pub-methods">Public Member Functions</a> \|
	<a href="classiceberg_1_1FileIO-members.html">List of all members</a> </div>
	<div class="headertitle"><div class="title">iceberg::FileIO Class Reference</div></div>
	</div><!--header-->
	<div class="contents">

	<p>Pluggable module for reading, writing, and deleting files.
	<a href="classiceberg_1_1FileIO.html#details">More...</a></p>

	<p><code>#include <<a class="el" href="file__io_8h_source.html">file_io.h</a>></code></p>
	<div class="dynheader">
	Inheritance diagram for iceberg::FileIO:</div>
	<div class="dyncontent">
	<div class="center">
	<img src="classiceberg_1_1FileIO.png" usemap="#iceberg::FileIO_map" alt=""/>
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	<area href="classiceberg_1_1MockFileIO.html" alt="iceberg::MockFileIO" shape="rect" coords="0,56,230,80"/>
	<area href="classiceberg_1_1arrow_1_1ArrowFileSystemFileIO.html" title="A concrete implementation of FileIO for Arrow file system." alt="iceberg::arrow::ArrowFileSystemFileIO" shape="rect" coords="240,56,470,80"/>
	<area href="classiceberg_1_1test_1_1StdFileIO.html" title="Simple local filesystem FileIO implementation for testing." alt="iceberg::test::StdFileIO" shape="rect" coords="480,56,710,80"/>
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	</div></div>
	<table class="memberdecls">
	<tr class="heading"><td colspan="2"><h2 class="groupheader"><a id="pub-methods" name="pub-methods"></a>
	Public Member Functions</h2></td></tr>
	<tr class="memitem:a714e3babeac9395ed6ef4b2f5c94a5cd" id="r_a714e3babeac9395ed6ef4b2f5c94a5cd"><td class="memItemLeft" align="right" valign="top">virtual Result< std::string > </td><td class="memItemRight" valign="bottom"><a class="el" href="classiceberg_1_1FileIO.html#a714e3babeac9395ed6ef4b2f5c94a5cd">ReadFile</a> (const std::string &file_location, std::optional< size_t > length)</td></tr>
	<tr class="memdesc:a714e3babeac9395ed6ef4b2f5c94a5cd"><td class="mdescLeft"> </td><td class="mdescRight">Read the content of the file at the given location. <br /></td></tr>
	<tr class="separator:a714e3babeac9395ed6ef4b2f5c94a5cd"><td class="memSeparator" colspan="2"> </td></tr>
	<tr class="memitem:a527a78aca1045034250f50a51d8dc0f9" id="r_a527a78aca1045034250f50a51d8dc0f9"><td class="memItemLeft" align="right" valign="top">virtual Status </td><td class="memItemRight" valign="bottom"><a class="el" href="classiceberg_1_1FileIO.html#a527a78aca1045034250f50a51d8dc0f9">WriteFile</a> (const std::string &file_location, std::string_view content)</td></tr>
	<tr class="memdesc:a527a78aca1045034250f50a51d8dc0f9"><td class="mdescLeft"> </td><td class="mdescRight">Write the given content to the file at the given location. <br /></td></tr>
	<tr class="separator:a527a78aca1045034250f50a51d8dc0f9"><td class="memSeparator" colspan="2"> </td></tr>
	<tr class="memitem:ace7c9ec329017d5a99082739e8578937" id="r_ace7c9ec329017d5a99082739e8578937"><td class="memItemLeft" align="right" valign="top">virtual Status </td><td class="memItemRight" valign="bottom"><a class="el" href="classiceberg_1_1FileIO.html#ace7c9ec329017d5a99082739e8578937">DeleteFile</a> (const std::string &file_location)</td></tr>
	<tr class="memdesc:ace7c9ec329017d5a99082739e8578937"><td class="mdescLeft"> </td><td class="mdescRight">Delete a file at the given location. <br /></td></tr>
	<tr class="separator:ace7c9ec329017d5a99082739e8578937"><td class="memSeparator" colspan="2"> </td></tr>
	</table>
	<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
	<div class="textblock"><p>Pluggable module for reading, writing, and deleting files. </p>
	<p>This module only handle metadata files, not data files. The metadata files are typically small and are used to store schema, partition information, and other metadata about the table.</p>
	<p>Note that these functions are not atomic. For example, if a write fails, the file may be partially written. Implementations should be careful to avoid corrupting metadata files. </p>
	</div><h2 class="groupheader">Member Function Documentation</h2>
	<a id="ace7c9ec329017d5a99082739e8578937" name="ace7c9ec329017d5a99082739e8578937"></a>
	<h2 class="memtitle"><span class="permalink"><a href="#ace7c9ec329017d5a99082739e8578937">◆ </a></span>DeleteFile()</h2>

	<div class="memitem">
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	<td class="mlabels-left">
	<table class="memname">
	<tr>
	<td class="memname">virtual Status iceberg::FileIO::DeleteFile </td>
	<td>(</td>
	<td class="paramtype">const std::string & </td>
	<td class="paramname"><em>file_location</em></td><td>)</td>
	<td></td>
	</tr>
	</table>
	</td>
	<td class="mlabels-right">
	<span class="mlabels"><span class="mlabel">inline</span><span class="mlabel">virtual</span></span> </td>
	</tr>
	</table>
	</div><div class="memdoc">

	<p>Delete a file at the given location. </p>
	<dl class="params"><dt>Parameters</dt><dd>
	<table class="params">
	<tr><td class="paramname">file_location</td><td>The location of the file to delete. </td></tr>
	</table>
	</dd>
	</dl>
	<dl class="section return"><dt>Returns</dt><dd>void if the delete succeeded, an error code if the delete failed. </dd></dl>

	<p>Reimplemented in <a class="el" href="classiceberg_1_1arrow_1_1ArrowFileSystemFileIO.html#a054c596530ea55f4e66155c46308ab74">iceberg::arrow::ArrowFileSystemFileIO</a>, and <a class="el" href="classiceberg_1_1test_1_1StdFileIO.html#a1050c568739393ef643f8601086a354e">iceberg::test::StdFileIO</a>.</p>

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	<a id="a714e3babeac9395ed6ef4b2f5c94a5cd" name="a714e3babeac9395ed6ef4b2f5c94a5cd"></a>
	<h2 class="memtitle"><span class="permalink"><a href="#a714e3babeac9395ed6ef4b2f5c94a5cd">◆ </a></span>ReadFile()</h2>

	<div class="memitem">
	<div class="memproto">
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	<td class="mlabels-left">
	<table class="memname">
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	<td class="memname">virtual Result< std::string > iceberg::FileIO::ReadFile </td>
	<td>(</td>
	<td class="paramtype">const std::string & </td>
	<td class="paramname"><em>file_location</em>, </td>
	</tr>
	<tr>
	<td class="paramkey"></td>
	<td></td>
	<td class="paramtype">std::optional< size_t > </td>
	<td class="paramname"><em>length</em> </td>
	</tr>
	<tr>
	<td></td>
	<td>)</td>
	<td></td><td></td>
	</tr>
	</table>
	</td>
	<td class="mlabels-right">
	<span class="mlabels"><span class="mlabel">inline</span><span class="mlabel">virtual</span></span> </td>
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	<p>Read the content of the file at the given location. </p>
	<dl class="params"><dt>Parameters</dt><dd>
	<table class="params">
	<tr><td class="paramname">file_location</td><td>The location of the file to read. </td></tr>
	<tr><td class="paramname">length</td><td>The number of bytes to read. Some object storage need to specify the length to read, e.g. S3 <code>GetObject</code> has a Range parameter. </td></tr>
	</table>
	</dd>
	</dl>
	<dl class="section return"><dt>Returns</dt><dd>The content of the file if the read succeeded, an error code if the read failed. </dd></dl>

	<p>Reimplemented in <a class="el" href="classiceberg_1_1arrow_1_1ArrowFileSystemFileIO.html#aa023cae7f400db161e6d847c2bf6f2f3">iceberg::arrow::ArrowFileSystemFileIO</a>, and <a class="el" href="classiceberg_1_1test_1_1StdFileIO.html#acd86d18e3fb3a5dc6b86584953ec34f1">iceberg::test::StdFileIO</a>.</p>

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	<a id="a527a78aca1045034250f50a51d8dc0f9" name="a527a78aca1045034250f50a51d8dc0f9"></a>
	<h2 class="memtitle"><span class="permalink"><a href="#a527a78aca1045034250f50a51d8dc0f9">◆ </a></span>WriteFile()</h2>

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	<td class="memname">virtual Status iceberg::FileIO::WriteFile </td>
	<td>(</td>
	<td class="paramtype">const std::string & </td>
	<td class="paramname"><em>file_location</em>, </td>
	</tr>
	<tr>
	<td class="paramkey"></td>
	<td></td>
	<td class="paramtype">std::string_view </td>
	<td class="paramname"><em>content</em> </td>
	</tr>
	<tr>
	<td></td>
	<td>)</td>
	<td></td><td></td>
	</tr>
	</table>
	</td>
	<td class="mlabels-right">
	<span class="mlabels"><span class="mlabel">inline</span><span class="mlabel">virtual</span></span> </td>
	</tr>
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	</div><div class="memdoc">

	<p>Write the given content to the file at the given location. </p>
	<dl class="params"><dt>Parameters</dt><dd>
	<table class="params">
	<tr><td class="paramname">file_location</td><td>The location of the file to write. </td></tr>
	<tr><td class="paramname">content</td><td>The content to write to the file. </td></tr>
	<tr><td class="paramname">overwrite</td><td>If true, overwrite the file if it exists. If false, fail if the file exists. </td></tr>
	</table>
	</dd>
	</dl>
	<dl class="section return"><dt>Returns</dt><dd>void if the write succeeded, an error code if the write failed. </dd></dl>

	<p>Reimplemented in <a class="el" href="classiceberg_1_1arrow_1_1ArrowFileSystemFileIO.html#a989c72cecf8dc2463cc90f947d36ba50">iceberg::arrow::ArrowFileSystemFileIO</a>, and <a class="el" href="classiceberg_1_1test_1_1StdFileIO.html#a42ed781e4a4eedf4538d8e1c8da28680">iceberg::test::StdFileIO</a>.</p>

	</div>
	</div>
	<hr/>The documentation for this class was generated from the following file:<ul>
	<li>iceberg/<a class="el" href="file__io_8h_source.html">file_io.h</a></li>
	</ul>
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