Google Git
Sign in
apache / lucenenet-site / b7932cab2a602cd78b928b7dd2376969de9ab8e2 / . / docs / 3.0.3 / _buffered_index_input_8cs_source.html
blob: fd63795c1fdab41baca6f0013f5861b7af44ab92 [file] [log] [blame]
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/>
<meta http-equiv="X-UA-Compatible" content="IE=9"/>
<meta name="generator" content="Doxygen 1.8.3"/>
<title>Lucene.Net: core/Store/BufferedIndexInput.cs Source File</title>
<link href="tabs.css" rel="stylesheet" type="text/css"/>
<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript" src="dynsections.js"></script>
<link href="search/search.css" rel="stylesheet" type="text/css"/>
<script type="text/javascript" src="search/search.js"></script>
<script type="text/javascript">
$(document).ready(function() { searchBox.OnSelectItem(0); });
</script>
<link href="doxygen.css" rel="stylesheet" type="text/css" />
</head>
<body>
<div id="top"><!-- do not remove this div, it is closed by doxygen! -->
<div id="titlearea">
<table cellspacing="0" cellpadding="0">
<tbody>
<tr style="height: 56px;">
<td id="projectlogo"><img alt="Logo" src="lucene-net-icon-128x128.png"/></td>
<td style="padding-left: 0.5em;">
<div id="projectname">Lucene.Net
&#160;<span id="projectnumber">3.0.3</span>
</div>
<div id="projectbrief">Lucene.Net is a .NET port of the Java Lucene Indexing Library</div>
</td>
</tr>
</tbody>
</table>
</div>
<!-- end header part -->
<!-- Generated by Doxygen 1.8.3 -->
<script type="text/javascript">
var searchBox = new SearchBox("searchBox", "search",false,'Search');
</script>
<div id="navrow1" class="tabs">
<ul class="tablist">
<li><a href="Index.html"><span>Main&#160;Page</span></a></li>
<li><a href="namespaces.html"><span>Packages</span></a></li>
<li><a href="annotated.html"><span>Classes</span></a></li>
<li class="current"><a href="files.html"><span>Files</span></a></li>
<li>
<div id="MSearchBox" class="MSearchBoxInactive">
<span class="left">
<img id="MSearchSelect" src="search/mag_sel.png"
onmouseover="return searchBox.OnSearchSelectShow()"
onmouseout="return searchBox.OnSearchSelectHide()"
alt=""/>
<input type="text" id="MSearchField" value="Search" accesskey="S"
onfocus="searchBox.OnSearchFieldFocus(true)"
onblur="searchBox.OnSearchFieldFocus(false)"
onkeyup="searchBox.OnSearchFieldChange(event)"/>
</span><span class="right">
<a id="MSearchClose" href="javascript:searchBox.CloseResultsWindow()"><img id="MSearchCloseImg" border="0" src="search/close.png" alt=""/></a>
</span>
</div>
</li>
</ul>
</div>
<div id="navrow2" class="tabs2">
<ul class="tablist">
<li><a href="files.html"><span>File&#160;List</span></a></li>
<li><a href="globals.html"><span>File&#160;Members</span></a></li>
</ul>
</div>
<!-- window showing the filter options -->
<div id="MSearchSelectWindow"
onmouseover="return searchBox.OnSearchSelectShow()"
onmouseout="return searchBox.OnSearchSelectHide()"
onkeydown="return searchBox.OnSearchSelectKey(event)">
<a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(0)"><span class="SelectionMark">&#160;</span>All</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(1)"><span class="SelectionMark">&#160;</span>Classes</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(2)"><span class="SelectionMark">&#160;</span>Namespaces</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(3)"><span class="SelectionMark">&#160;</span>Files</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(4)"><span class="SelectionMark">&#160;</span>Functions</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(5)"><span class="SelectionMark">&#160;</span>Variables</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(6)"><span class="SelectionMark">&#160;</span>Typedefs</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(7)"><span class="SelectionMark">&#160;</span>Enumerations</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(8)"><span class="SelectionMark">&#160;</span>Properties</a></div>
<!-- iframe showing the search results (closed by default) -->
<div id="MSearchResultsWindow">
<iframe src="javascript:void(0)" frameborder="0"
name="MSearchResults" id="MSearchResults">
</iframe>
</div>
<div id="nav-path" class="navpath">
<ul>
<li class="navelem"><a class="el" href="dir_1efe588324fc547683bba4a3f1bac847.html">core</a></li><li class="navelem"><a class="el" href="dir_0fd6a22b48ba7ca96d8c1554e5fff3e1.html">Store</a></li> </ul>
</div>
</div><!-- top -->
<div class="header">
<div class="headertitle">
<div class="title">BufferedIndexInput.cs</div> </div>
</div><!--header-->
<div class="contents">
<a href="_buffered_index_input_8cs.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span>&#160;<span class="comment">/* </span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span>&#160;<span class="comment"> * Licensed to the Apache Software Foundation (ASF) under one or more</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span>&#160;<span class="comment"> * contributor license agreements. See the NOTICE file distributed with</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span>&#160;<span class="comment"> * this work for additional information regarding copyright ownership.</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span>&#160;<span class="comment"> * The ASF licenses this file to You under the Apache License, Version 2.0</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span>&#160;<span class="comment"> * (the &quot;License&quot;); you may not use this file except in compliance with</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span>&#160;<span class="comment"> * the License. You may obtain a copy of the License at</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span>&#160;<span class="comment"> * </span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span>&#160;<span class="comment"> * http://www.apache.org/licenses/LICENSE-2.0</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span>&#160;<span class="comment"> * </span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span>&#160;<span class="comment"> * Unless required by applicable law or agreed to in writing, software</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span>&#160;<span class="comment"> * distributed under the License is distributed on an &quot;AS IS&quot; BASIS,</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span>&#160;<span class="comment"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span>&#160;<span class="comment"> * See the License for the specific language governing permissions and</span></div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span>&#160;<span class="comment"> * limitations under the License.</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span>&#160;<span class="comment"> */</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span>&#160;</div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span>&#160;<span class="keyword">using</span> System;</div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span>&#160;</div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span>&#160;<span class="keyword">namespace </span>Lucene.Net.Store</div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span>&#160;{</div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span>&#160; </div>
<div class="line"><a name="l00024"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_store_1_1_buffered_index_input.html"> 24</a></span>&#160; <span class="keyword">public</span> <span class="keyword">abstract</span> <span class="keyword">class </span><a class="code" href="class_lucene_1_1_net_1_1_store_1_1_buffered_index_input.html" title="Base implementation class for buffered IndexInput. ">BufferedIndexInput</a> : <a class="code" href="class_lucene_1_1_net_1_1_store_1_1_index_input.html" title="Abstract base class for input from a file in a Directory. A random-access input stream. Used for all Lucene index input operations. ">IndexInput</a>, System.ICloneable</div>
<div class="line"><a name="l00025"></a><span class="lineno"> 25</span>&#160; {</div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>&#160; </div>
<div class="line"><a name="l00028"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_store_1_1_buffered_index_input.html#a57f50895a77d1f3942afac4a1df5a393"> 28</a></span>&#160; <span class="keyword">public</span> <span class="keyword">const</span> <span class="keywordtype">int</span> BUFFER_SIZE = 1024;</div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span>&#160; </div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span>&#160; <span class="keyword">private</span> <span class="keywordtype">int</span> _bufferSize = BUFFER_SIZE;</div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>&#160; </div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>&#160; <span class="keyword">protected</span> <span class="keyword">internal</span> byte[] buffer;</div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>&#160; </div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>&#160; <span class="keyword">private</span> <span class="keywordtype">long</span> bufferStart = 0; <span class="comment">// position in file of buffer</span></div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>&#160; <span class="keyword">private</span> <span class="keywordtype">int</span> bufferLength = 0; <span class="comment">// end of valid bytes</span></div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>&#160; <span class="keyword">private</span> <span class="keywordtype">int</span> bufferPosition = 0; <span class="comment">// next byte to read</span></div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>&#160; </div>
<div class="line"><a name="l00038"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_store_1_1_buffered_index_input.html#a9b246c7d1caa549dfe3c845b422d7493"> 38</a></span>&#160; <span class="keyword">public</span> <span class="keyword">override</span> byte ReadByte()</div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>&#160; {</div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>&#160; <span class="keywordflow">if</span> (bufferPosition &gt;= bufferLength)</div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>&#160; Refill();</div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>&#160; <span class="keywordflow">return</span> buffer[bufferPosition++];</div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>&#160; }</div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>&#160;</div>
<div class="line"><a name="l00045"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_store_1_1_buffered_index_input.html#a36860af3edc5070bf23f5f1fd589c476"> 45</a></span>&#160; <span class="keyword">protected</span> <a class="code" href="_compound_file_reader_8cs.html#a4770f48c7bfb99d5245f65069d5ff4e0">BufferedIndexInput</a>()</div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>&#160; {</div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>&#160; }</div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>&#160; </div>
<div class="line"><a name="l00050"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_store_1_1_buffered_index_input.html#a66d4a75335786e4cf831e227c9ba88c4"> 50</a></span>&#160; <span class="keyword">protected</span> <a class="code" href="_compound_file_reader_8cs.html#a4770f48c7bfb99d5245f65069d5ff4e0">BufferedIndexInput</a>(<span class="keywordtype">int</span> bufferSize)</div>
<div class="line"><a name="l00051"></a><span class="lineno"> 51</span>&#160; {</div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>&#160; CheckBufferSize(bufferSize);</div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>&#160; this._bufferSize = bufferSize;</div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>&#160; }</div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>&#160; </div>
<div class="line"><a name="l00057"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_store_1_1_buffered_index_input.html#afb59e7f3d587cf2aeefe41da40ea7278"> 57</a></span>&#160; <span class="keyword">public</span> <span class="keyword">virtual</span> <span class="keywordtype">void</span> SetBufferSize(<span class="keywordtype">int</span> newSize)</div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>&#160; {</div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>&#160; System.Diagnostics.Debug.Assert(buffer == null || _bufferSize == buffer.Length, <span class="stringliteral">&quot;buffer=&quot;</span> + buffer + <span class="stringliteral">&quot; bufferSize=&quot;</span> + _bufferSize + <span class="stringliteral">&quot; buffer.length=&quot;</span> +(buffer != null ? buffer.Length: 0));</div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>&#160; <span class="keywordflow">if</span> (newSize != _bufferSize)</div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>&#160; {</div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>&#160; CheckBufferSize(newSize);</div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>&#160; _bufferSize = newSize;</div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>&#160; <span class="keywordflow">if</span> (buffer != null)</div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>&#160; {</div>
<div class="line"><a name="l00066"></a><span class="lineno"> 66</span>&#160; <span class="comment">// Resize the existing buffer and carefully save as</span></div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>&#160; <span class="comment">// many bytes as possible starting from the current</span></div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>&#160; <span class="comment">// bufferPosition</span></div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>&#160; byte[] newBuffer = <span class="keyword">new</span> byte[newSize];</div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>&#160; <span class="keywordtype">int</span> leftInBuffer = bufferLength - bufferPosition;</div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>&#160; <span class="keywordtype">int</span> numToCopy;</div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>&#160; <span class="keywordflow">if</span> (leftInBuffer &gt; newSize)</div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>&#160; numToCopy = newSize;</div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>&#160; <span class="keywordflow">else</span></div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>&#160; numToCopy = leftInBuffer;</div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>&#160; Array.Copy(buffer, bufferPosition, newBuffer, 0, numToCopy);</div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>&#160; bufferStart += bufferPosition;</div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>&#160; bufferPosition = 0;</div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>&#160; bufferLength = numToCopy;</div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>&#160; NewBuffer(newBuffer);</div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>&#160; }</div>
<div class="line"><a name="l00082"></a><span class="lineno"> 82</span>&#160; }</div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>&#160; }</div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>&#160; </div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>&#160; <span class="keyword">protected</span> <span class="keyword">internal</span> <span class="keyword">virtual</span> <span class="keywordtype">void</span> NewBuffer(byte[] newBuffer)</div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>&#160; {</div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>&#160; <span class="comment">// Subclasses can do something here</span></div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>&#160; buffer = newBuffer;</div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>&#160; }</div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>&#160;</div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>&#160; <span class="keyword">public</span> <span class="keyword">virtual</span> <span class="keywordtype">int</span> BufferSize</div>
<div class="line"><a name="l00094"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_store_1_1_buffered_index_input.html#aa08929b972c6598f159819db738198cd"> 94</a></span>&#160; {</div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>&#160; <span class="keyword">get</span> { <span class="keywordflow">return</span> _bufferSize; }</div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>&#160; }</div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>&#160;</div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>&#160; <span class="keyword">private</span> <span class="keywordtype">void</span> CheckBufferSize(<span class="keywordtype">int</span> bufferSize)</div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>&#160; {</div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>&#160; <span class="keywordflow">if</span> (bufferSize &lt;= 0)</div>
<div class="line"><a name="l00101"></a><span class="lineno"> 101</span>&#160; <span class="keywordflow">throw</span> <span class="keyword">new</span> System.ArgumentException(<span class="stringliteral">&quot;bufferSize must be greater than 0 (got &quot;</span> + bufferSize + <span class="stringliteral">&quot;)&quot;</span>);</div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>&#160; }</div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>&#160; </div>
<div class="line"><a name="l00104"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_store_1_1_buffered_index_input.html#ab72a40d6c16cd5c3d4e5919ac1279ffe"> 104</a></span>&#160; <span class="keyword">public</span> <span class="keyword">override</span> <span class="keywordtype">void</span> ReadBytes(byte[] b, <span class="keywordtype">int</span> offset, <span class="keywordtype">int</span> len)</div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>&#160; {</div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>&#160; ReadBytes(b, offset, len, <span class="keyword">true</span>);</div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>&#160; }</div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>&#160; </div>
<div class="line"><a name="l00109"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_store_1_1_buffered_index_input.html#a46d25b8c06552053cd0aff8a123e6cfd"> 109</a></span>&#160; <span class="keyword">public</span> <span class="keyword">override</span> <span class="keywordtype">void</span> ReadBytes(byte[] b, <span class="keywordtype">int</span> offset, <span class="keywordtype">int</span> len, <span class="keywordtype">bool</span> useBuffer)</div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>&#160; {</div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>&#160; </div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>&#160; <span class="keywordflow">if</span> (len &lt;= (bufferLength - bufferPosition))</div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>&#160; {</div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>&#160; <span class="comment">// the buffer contains enough data to satisfy this request</span></div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>&#160; <span class="keywordflow">if</span> (len &gt; 0)</div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>&#160; <span class="comment">// to allow b to be null if len is 0...</span></div>
<div class="line"><a name="l00117"></a><span class="lineno"> 117</span>&#160; Array.Copy(buffer, bufferPosition, b, offset, len);</div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>&#160; bufferPosition += len;</div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>&#160; }</div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>&#160; <span class="keywordflow">else</span></div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>&#160; {</div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>&#160; <span class="comment">// the buffer does not have enough data. First serve all we&#39;ve got.</span></div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>&#160; <span class="keywordtype">int</span> available = bufferLength - bufferPosition;</div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>&#160; <span class="keywordflow">if</span> (available &gt; 0)</div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>&#160; {</div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>&#160; Array.Copy(buffer, bufferPosition, b, offset, available);</div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>&#160; offset += available;</div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>&#160; len -= available;</div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>&#160; bufferPosition += available;</div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>&#160; }</div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>&#160; <span class="comment">// and now, read the remaining &#39;len&#39; bytes:</span></div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span>&#160; <span class="keywordflow">if</span> (useBuffer &amp;&amp; len &lt; _bufferSize)</div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>&#160; {</div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>&#160; <span class="comment">// If the amount left to read is small enough, and</span></div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>&#160; <span class="comment">// we are allowed to use our buffer, do it in the usual</span></div>
<div class="line"><a name="l00136"></a><span class="lineno"> 136</span>&#160; <span class="comment">// buffered way: fill the buffer and copy from it:</span></div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>&#160; Refill();</div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>&#160; <span class="keywordflow">if</span> (bufferLength &lt; len)</div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>&#160; {</div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>&#160; <span class="comment">// Throw an exception when refill() could not read len bytes:</span></div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span>&#160; Array.Copy(buffer, 0, b, offset, bufferLength);</div>
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span>&#160; <span class="keywordflow">throw</span> <span class="keyword">new</span> System.IO.IOException(<span class="stringliteral">&quot;read past EOF&quot;</span>);</div>
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span>&#160; }</div>
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span>&#160; <span class="keywordflow">else</span></div>
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>&#160; {</div>
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span>&#160; Array.Copy(buffer, 0, b, offset, len);</div>
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span>&#160; bufferPosition = len;</div>
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span>&#160; }</div>
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>&#160; }</div>
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span>&#160; <span class="keywordflow">else</span></div>
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span>&#160; {</div>
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span>&#160; <span class="comment">// The amount left to read is larger than the buffer</span></div>
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span>&#160; <span class="comment">// or we&#39;ve been asked to not use our buffer -</span></div>
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span>&#160; <span class="comment">// there&#39;s no performance reason not to read it all</span></div>
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span>&#160; <span class="comment">// at once. Note that unlike the previous code of</span></div>
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span>&#160; <span class="comment">// this function, there is no need to do a seek</span></div>
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span>&#160; <span class="comment">// here, because there&#39;s no need to reread what we</span></div>
<div class="line"><a name="l00158"></a><span class="lineno"> 158</span>&#160; <span class="comment">// had in the buffer.</span></div>
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span>&#160; <span class="keywordtype">long</span> after = bufferStart + bufferPosition + len;</div>
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span>&#160; <span class="keywordflow">if</span> (after &gt; Length())</div>
<div class="line"><a name="l00161"></a><span class="lineno"> 161</span>&#160; <span class="keywordflow">throw</span> <span class="keyword">new</span> System.IO.IOException(<span class="stringliteral">&quot;read past EOF&quot;</span>);</div>
<div class="line"><a name="l00162"></a><span class="lineno"> 162</span>&#160; ReadInternal(b, offset, len);</div>
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span>&#160; bufferStart = after;</div>
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span>&#160; bufferPosition = 0;</div>
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span>&#160; bufferLength = 0; <span class="comment">// trigger refill() on read</span></div>
<div class="line"><a name="l00166"></a><span class="lineno"> 166</span>&#160; }</div>
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span>&#160; }</div>
<div class="line"><a name="l00168"></a><span class="lineno"> 168</span>&#160; }</div>
<div class="line"><a name="l00169"></a><span class="lineno"> 169</span>&#160; </div>
<div class="line"><a name="l00170"></a><span class="lineno"> 170</span>&#160; <span class="keyword">private</span> <span class="keywordtype">void</span> Refill()</div>
<div class="line"><a name="l00171"></a><span class="lineno"> 171</span>&#160; {</div>
<div class="line"><a name="l00172"></a><span class="lineno"> 172</span>&#160; <span class="keywordtype">long</span> start = bufferStart + bufferPosition;</div>
<div class="line"><a name="l00173"></a><span class="lineno"> 173</span>&#160; <span class="keywordtype">long</span> end = start + _bufferSize;</div>
<div class="line"><a name="l00174"></a><span class="lineno"> 174</span>&#160; <span class="keywordflow">if</span> (end &gt; Length())</div>
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span>&#160; <span class="comment">// don&#39;t read past EOF</span></div>
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span>&#160; end = Length();</div>
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span>&#160; <span class="keywordtype">int</span> newLength = (int) (end - start);</div>
<div class="line"><a name="l00178"></a><span class="lineno"> 178</span>&#160; <span class="keywordflow">if</span> (newLength &lt;= 0)</div>
<div class="line"><a name="l00179"></a><span class="lineno"> 179</span>&#160; <span class="keywordflow">throw</span> <span class="keyword">new</span> System.IO.IOException(<span class="stringliteral">&quot;read past EOF&quot;</span>);</div>
<div class="line"><a name="l00180"></a><span class="lineno"> 180</span>&#160; </div>
<div class="line"><a name="l00181"></a><span class="lineno"> 181</span>&#160; <span class="keywordflow">if</span> (buffer == null)</div>
<div class="line"><a name="l00182"></a><span class="lineno"> 182</span>&#160; {</div>
<div class="line"><a name="l00183"></a><span class="lineno"> 183</span>&#160; NewBuffer(<span class="keyword">new</span> byte[_bufferSize]); <span class="comment">// allocate buffer lazily</span></div>
<div class="line"><a name="l00184"></a><span class="lineno"> 184</span>&#160; SeekInternal(bufferStart);</div>
<div class="line"><a name="l00185"></a><span class="lineno"> 185</span>&#160; }</div>
<div class="line"><a name="l00186"></a><span class="lineno"> 186</span>&#160; ReadInternal(buffer, 0, newLength);</div>
<div class="line"><a name="l00187"></a><span class="lineno"> 187</span>&#160; bufferLength = newLength;</div>
<div class="line"><a name="l00188"></a><span class="lineno"> 188</span>&#160; bufferStart = start;</div>
<div class="line"><a name="l00189"></a><span class="lineno"> 189</span>&#160; bufferPosition = 0;</div>
<div class="line"><a name="l00190"></a><span class="lineno"> 190</span>&#160; }</div>
<div class="line"><a name="l00191"></a><span class="lineno"> 191</span>&#160; </div>
<div class="line"><a name="l00201"></a><span class="lineno"> 201</span>&#160; <span class="keyword">public</span> <span class="keyword">abstract</span> <span class="keywordtype">void</span> ReadInternal(byte[] b, <span class="keywordtype">int</span> offset, <span class="keywordtype">int</span> length);</div>
<div class="line"><a name="l00202"></a><span class="lineno"> 202</span>&#160;</div>
<div class="line"><a name="l00203"></a><span class="lineno"> 203</span>&#160; <span class="keyword">public</span> <span class="keyword">override</span> <span class="keywordtype">long</span> FilePointer</div>
<div class="line"><a name="l00204"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_store_1_1_buffered_index_input.html#a0c7dc4d8cb466311840a83265c5baafa"> 204</a></span>&#160; {</div>
<div class="line"><a name="l00205"></a><span class="lineno"> 205</span>&#160; <span class="keyword">get</span> { <span class="keywordflow">return</span> bufferStart + bufferPosition; }</div>
<div class="line"><a name="l00206"></a><span class="lineno"> 206</span>&#160; }</div>
<div class="line"><a name="l00207"></a><span class="lineno"> 207</span>&#160;</div>
<div class="line"><a name="l00208"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_store_1_1_buffered_index_input.html#a7e9a8492f0572972e2b41bc4f1121166"> 208</a></span>&#160; <span class="keyword">public</span> <span class="keyword">override</span> <span class="keywordtype">void</span> Seek(<span class="keywordtype">long</span> pos)</div>
<div class="line"><a name="l00209"></a><span class="lineno"> 209</span>&#160; {</div>
<div class="line"><a name="l00210"></a><span class="lineno"> 210</span>&#160; <span class="keywordflow">if</span> (pos &gt;= bufferStart &amp;&amp; pos &lt; (bufferStart + bufferLength))</div>
<div class="line"><a name="l00211"></a><span class="lineno"> 211</span>&#160; bufferPosition = (int) (pos - bufferStart);</div>
<div class="line"><a name="l00212"></a><span class="lineno"> 212</span>&#160; <span class="comment">// seek within buffer</span></div>
<div class="line"><a name="l00213"></a><span class="lineno"> 213</span>&#160; <span class="keywordflow">else</span></div>
<div class="line"><a name="l00214"></a><span class="lineno"> 214</span>&#160; {</div>
<div class="line"><a name="l00215"></a><span class="lineno"> 215</span>&#160; bufferStart = pos;</div>
<div class="line"><a name="l00216"></a><span class="lineno"> 216</span>&#160; bufferPosition = 0;</div>
<div class="line"><a name="l00217"></a><span class="lineno"> 217</span>&#160; bufferLength = 0; <span class="comment">// trigger refill() on read()</span></div>
<div class="line"><a name="l00218"></a><span class="lineno"> 218</span>&#160; SeekInternal(pos);</div>
<div class="line"><a name="l00219"></a><span class="lineno"> 219</span>&#160; }</div>
<div class="line"><a name="l00220"></a><span class="lineno"> 220</span>&#160; }</div>
<div class="line"><a name="l00221"></a><span class="lineno"> 221</span>&#160; </div>
<div class="line"><a name="l00227"></a><span class="lineno"> 227</span>&#160; <span class="keyword">public</span> <span class="keyword">abstract</span> <span class="keywordtype">void</span> SeekInternal(<span class="keywordtype">long</span> pos);</div>
<div class="line"><a name="l00228"></a><span class="lineno"> 228</span>&#160; </div>
<div class="line"><a name="l00229"></a><span class="lineno"><a class="code" href="class_lucene_1_1_net_1_1_store_1_1_buffered_index_input.html#a2af4a6df705c09aeebdd8cc580dc4b30"> 229</a></span>&#160; <span class="keyword">public</span> <span class="keyword">override</span> System.Object Clone()</div>
<div class="line"><a name="l00230"></a><span class="lineno"> 230</span>&#160; {</div>
<div class="line"><a name="l00231"></a><span class="lineno"> 231</span>&#160; <a class="code" href="class_lucene_1_1_net_1_1_store_1_1_buffered_index_input.html" title="Base implementation class for buffered IndexInput. ">BufferedIndexInput</a> clone = (<a class="code" href="_compound_file_reader_8cs.html#a4770f48c7bfb99d5245f65069d5ff4e0">BufferedIndexInput</a>) base.<a class="code" href="class_lucene_1_1_net_1_1_store_1_1_buffered_index_input.html#a2af4a6df705c09aeebdd8cc580dc4b30" title="Returns a clone of this stream.">Clone</a>();</div>
<div class="line"><a name="l00232"></a><span class="lineno"> 232</span>&#160; </div>
<div class="line"><a name="l00233"></a><span class="lineno"> 233</span>&#160; clone.buffer = null;</div>
<div class="line"><a name="l00234"></a><span class="lineno"> 234</span>&#160; clone.bufferLength = 0;</div>
<div class="line"><a name="l00235"></a><span class="lineno"> 235</span>&#160; clone.bufferPosition = 0;</div>
<div class="line"><a name="l00236"></a><span class="lineno"> 236</span>&#160; clone.bufferStart = FilePointer;</div>
<div class="line"><a name="l00237"></a><span class="lineno"> 237</span>&#160; </div>
<div class="line"><a name="l00238"></a><span class="lineno"> 238</span>&#160; <span class="keywordflow">return</span> clone;</div>
<div class="line"><a name="l00239"></a><span class="lineno"> 239</span>&#160; }</div>
<div class="line"><a name="l00240"></a><span class="lineno"> 240</span>&#160; }</div>
<div class="line"><a name="l00241"></a><span class="lineno"> 241</span>&#160;}</div>
</div><!-- fragment --></div><!-- contents -->
<!-- start footer part -->
<hr class="footer"/><address class="footer"><small>
Generated on Thu Jan 3 2013 02:12:46 for Lucene.Net by &#160;<a href="http://www.doxygen.org/index.html">
<img class="footer" src="doxygen.png" alt="doxygen"/>
</a> 1.8.3
</small></address>
</body>
</html>