docs/3.0.3/_index_reader_8cs.html - lucenenet-site - Git at Google

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 <tr class="memitem:"><td class="memItemLeft" align="right" valign="top">class &#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="class_lucene_1_1_net_1_1_index_1_1_index_reader.html">Lucene.Net.Index.IndexReader</a></td></tr>
 <tr class="memdesc:"><td class="mdescLeft">&#160;</td><td class="mdescRight"><a class="el" href="class_lucene_1_1_net_1_1_index_1_1_index_reader.html" title="IndexReader is an abstract class, providing an interface for accessing an index. Search of an index i...">IndexReader</a> is an abstract class, providing an interface for accessing an index. <a class="el" href="namespace_lucene_1_1_net_1_1_search.html">Search</a> of an index is done entirely through this abstract interface, so that any subclass which implements it is searchable. Concrete subclasses of <a class="el" href="class_lucene_1_1_net_1_1_index_1_1_index_reader.html" title="IndexReader is an abstract class, providing an interface for accessing an index. Search of an index i...">IndexReader</a> are usually constructed with a call to one of the static <code>open()</code> methods, e.g. <a class="el" href="class_lucene_1_1_net_1_1_index_1_1_index_reader.html#ad51f1feca975e447b6486d01ed24e1ea" title="Returns an IndexReader reading the index in the given Directory. You should pass readOnly=true, since it gives much better concurrent performance, unless you intend to do write operations (delete documents or change norms) with the reader. ">Open(Lucene.Net.Store.Directory, bool)</a> For efficiency, in this API documents are often referred to via <em>document numbers</em>, non-negative integers which each name a unique document in the index. These document numbers are ephemeral&ndash;they may change as documents are added to and deleted from an index. Clients should thus not rely on a given document having the same number between sessions. An <a class="el" href="class_lucene_1_1_net_1_1_index_1_1_index_reader.html" title="IndexReader is an abstract class, providing an interface for accessing an index. Search of an index i...">IndexReader</a> can be opened on a directory for which an <a class="el" href="class_lucene_1_1_net_1_1_index_1_1_index_writer.html" title="An IndexWriter creates and maintains an index. The create argument to the constructor determines whet...">IndexWriter</a> is opened already, but it cannot be used to delete documents from the index then. <b>NOTE</b>: for backwards API compatibility, several methods are not listed as abstract, but have no useful implementations in this base class and instead always throw UnsupportedOperationException. Subclasses are strongly encouraged to override these methods, but in many cases may not need to. <b>NOTE</b>: as of 2.4, it's possible to open a read-only <a class="el" href="class_lucene_1_1_net_1_1_index_1_1_index_reader.html" title="IndexReader is an abstract class, providing an interface for accessing an index. Search of an index i...">IndexReader</a> using the static open methods that accepts the boolean readOnly parameter. Such a reader has better better concurrency as it's not necessary to synchronize on the isDeleted method. You must explicitly specify false if you want to make changes with the resulting <a class="el" href="class_lucene_1_1_net_1_1_index_1_1_index_reader.html" title="IndexReader is an abstract class, providing an interface for accessing an index. Search of an index i...">IndexReader</a>. <a class="anchor" id="thread-safety"></a><b>NOTE</b>: <a class="el" href="class_lucene_1_1_net_1_1_index_1_1_index_reader.html" title="IndexReader is an abstract class, providing an interface for accessing an index. Search of an index i...">IndexReader</a> instances are completely thread safe, meaning multiple threads can call any of its methods, concurrently. If your application requires external synchronization, you should <b>not</b> synchronize on the <code><a class="el" href="class_lucene_1_1_net_1_1_index_1_1_index_reader.html" title="IndexReader is an abstract class, providing an interface for accessing an index. Search of an index i...">IndexReader</a></code> instance; use your own (non-Lucene) objects instead.  <a href="class_lucene_1_1_net_1_1_index_1_1_index_reader.html#details">More...</a><br/></td></tr>
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 <tr class="memdesc:"><td class="mdescLeft">&#160;</td><td class="mdescRight">Constants describing field properties, for example used for <a class="el" href="class_lucene_1_1_net_1_1_index_1_1_index_reader.html#a8c4e81993a2de016248031c3766f3ab7" title="Get a list of unique field names that exist in this index and have the specified field option informa...">IndexReader.GetFieldNames(FieldOption)</a>.  <a href="class_lucene_1_1_net_1_1_index_1_1_index_reader_1_1_field_option.html#details">More...</a><br/></td></tr>
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 <p>Definition at line <a class="el" href="_index_reader_8cs_source.html#l00021">21</a> of file <a class="el" href="_index_reader_8cs_source.html">IndexReader.cs</a>.</p>

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           <td class="memname">using <a class="el" href="interface_lucene_1_1_net_1_1_documents_1_1_field_selector.html">FieldSelector</a> =  <a class="el" href="interface_lucene_1_1_net_1_1_documents_1_1_field_selector.html">Lucene.Net.Documents.FieldSelector</a></td>
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 <p>Definition at line <a class="el" href="_index_reader_8cs_source.html#l00022">22</a> of file <a class="el" href="_index_reader_8cs_source.html">IndexReader.cs</a>.</p>

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 <p>Definition at line <a class="el" href="_index_reader_8cs_source.html#l00024">24</a> of file <a class="el" href="_index_reader_8cs_source.html">IndexReader.cs</a>.</p>

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	<tr class="memdesc:"><td class="mdescLeft"> </td><td class="mdescRight"><a class="el" href="class_lucene_1_1_net_1_1_index_1_1_index_reader.html" title="IndexReader is an abstract class, providing an interface for accessing an index. Search of an index i...">IndexReader</a> is an abstract class, providing an interface for accessing an index. <a class="el" href="namespace_lucene_1_1_net_1_1_search.html">Search</a> of an index is done entirely through this abstract interface, so that any subclass which implements it is searchable. Concrete subclasses of <a class="el" href="class_lucene_1_1_net_1_1_index_1_1_index_reader.html" title="IndexReader is an abstract class, providing an interface for accessing an index. Search of an index i...">IndexReader</a> are usually constructed with a call to one of the static <code>open()</code> methods, e.g. <a class="el" href="class_lucene_1_1_net_1_1_index_1_1_index_reader.html#ad51f1feca975e447b6486d01ed24e1ea" title="Returns an IndexReader reading the index in the given Directory. You should pass readOnly=true, since it gives much better concurrent performance, unless you intend to do write operations (delete documents or change norms) with the reader. ">Open(Lucene.Net.Store.Directory, bool)</a> For efficiency, in this API documents are often referred to via <em>document numbers</em>, non-negative integers which each name a unique document in the index. These document numbers are ephemeral–they may change as documents are added to and deleted from an index. Clients should thus not rely on a given document having the same number between sessions. An <a class="el" href="class_lucene_1_1_net_1_1_index_1_1_index_reader.html" title="IndexReader is an abstract class, providing an interface for accessing an index. Search of an index i...">IndexReader</a> can be opened on a directory for which an <a class="el" href="class_lucene_1_1_net_1_1_index_1_1_index_writer.html" title="An IndexWriter creates and maintains an index. The create argument to the constructor determines whet...">IndexWriter</a> is opened already, but it cannot be used to delete documents from the index then. <b>NOTE</b>: for backwards API compatibility, several methods are not listed as abstract, but have no useful implementations in this base class and instead always throw UnsupportedOperationException. Subclasses are strongly encouraged to override these methods, but in many cases may not need to. <b>NOTE</b>: as of 2.4, it's possible to open a read-only <a class="el" href="class_lucene_1_1_net_1_1_index_1_1_index_reader.html" title="IndexReader is an abstract class, providing an interface for accessing an index. Search of an index i...">IndexReader</a> using the static open methods that accepts the boolean readOnly parameter. Such a reader has better better concurrency as it's not necessary to synchronize on the isDeleted method. You must explicitly specify false if you want to make changes with the resulting <a class="el" href="class_lucene_1_1_net_1_1_index_1_1_index_reader.html" title="IndexReader is an abstract class, providing an interface for accessing an index. Search of an index i...">IndexReader</a>. <a class="anchor" id="thread-safety"></a><b>NOTE</b>: <a class="el" href="class_lucene_1_1_net_1_1_index_1_1_index_reader.html" title="IndexReader is an abstract class, providing an interface for accessing an index. Search of an index i...">IndexReader</a> instances are completely thread safe, meaning multiple threads can call any of its methods, concurrently. If your application requires external synchronization, you should <b>not</b> synchronize on the <code><a class="el" href="class_lucene_1_1_net_1_1_index_1_1_index_reader.html" title="IndexReader is an abstract class, providing an interface for accessing an index. Search of an index i...">IndexReader</a></code> instance; use your own (non-Lucene) objects instead. <a href="class_lucene_1_1_net_1_1_index_1_1_index_reader.html#details">More...</a><br/></td></tr>
	<tr class="separator:"><td class="memSeparator" colspan="2"> </td></tr>
	<tr class="memitem:"><td class="memItemLeft" align="right" valign="top">class  </td><td class="memItemRight" valign="bottom"><a class="el" href="class_lucene_1_1_net_1_1_index_1_1_index_reader_1_1_field_option.html">Lucene.Net.Index.IndexReader.FieldOption</a></td></tr>
	<tr class="memdesc:"><td class="mdescLeft"> </td><td class="mdescRight">Constants describing field properties, for example used for <a class="el" href="class_lucene_1_1_net_1_1_index_1_1_index_reader.html#a8c4e81993a2de016248031c3766f3ab7" title="Get a list of unique field names that exist in this index and have the specified field option informa...">IndexReader.GetFieldNames(FieldOption)</a>. <a href="class_lucene_1_1_net_1_1_index_1_1_index_reader_1_1_field_option.html#details">More...</a><br/></td></tr>
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	Namespaces</h2></td></tr>
	<tr class="memitem:namespace_lucene_1_1_net_1_1_index"><td class="memItemLeft" align="right" valign="top">package  </td><td class="memItemRight" valign="bottom"><a class="el" href="namespace_lucene_1_1_net_1_1_index.html">Lucene.Net.Index</a></td></tr>
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	Typedefs</h2></td></tr>
	<tr class="memitem:a2ad6aef8641c7b7a6cf9277f7d54b2cd"><td class="memItemLeft" align="right" valign="top">using </td><td class="memItemRight" valign="bottom"><a class="el" href="_index_reader_8cs.html#a2ad6aef8641c7b7a6cf9277f7d54b2cd">Document</a> = <a class="el" href="class_lucene_1_1_net_1_1_documents_1_1_document.html">Lucene.Net.Documents.Document</a></td></tr>
	<tr class="separator:a2ad6aef8641c7b7a6cf9277f7d54b2cd"><td class="memSeparator" colspan="2"> </td></tr>
	<tr class="memitem:a64b447ee53d30ce66ebd27b2715e7bca"><td class="memItemLeft" align="right" valign="top">using </td><td class="memItemRight" valign="bottom"><a class="el" href="_index_reader_8cs.html#a64b447ee53d30ce66ebd27b2715e7bca">FieldSelector</a> = <a class="el" href="interface_lucene_1_1_net_1_1_documents_1_1_field_selector.html">Lucene.Net.Documents.FieldSelector</a></td></tr>
	<tr class="separator:a64b447ee53d30ce66ebd27b2715e7bca"><td class="memSeparator" colspan="2"> </td></tr>
	<tr class="memitem:a5431a3a4edd067eec50ca39b5ea99c31"><td class="memItemLeft" align="right" valign="top">using </td><td class="memItemRight" valign="bottom"><a class="el" href="_index_reader_8cs.html#a5431a3a4edd067eec50ca39b5ea99c31">Similarity</a> = <a class="el" href="class_lucene_1_1_net_1_1_search_1_1_similarity.html">Lucene.Net.Search.Similarity</a></td></tr>
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	<h2 class="groupheader">Typedef Documentation</h2>
	<a class="anchor" id="a2ad6aef8641c7b7a6cf9277f7d54b2cd"></a>
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	<td class="memname">using <a class="el" href="class_lucene_1_1_net_1_1_documents_1_1_document.html">Document</a> = <a class="el" href="class_lucene_1_1_net_1_1_documents_1_1_document.html">Lucene.Net.Documents.Document</a></td>
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	<p>Definition at line <a class="el" href="_index_reader_8cs_source.html#l00021">21</a> of file <a class="el" href="_index_reader_8cs_source.html">IndexReader.cs</a>.</p>

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	<td class="memname">using <a class="el" href="interface_lucene_1_1_net_1_1_documents_1_1_field_selector.html">FieldSelector</a> = <a class="el" href="interface_lucene_1_1_net_1_1_documents_1_1_field_selector.html">Lucene.Net.Documents.FieldSelector</a></td>
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	</div><div class="memdoc">

	<p>Definition at line <a class="el" href="_index_reader_8cs_source.html#l00022">22</a> of file <a class="el" href="_index_reader_8cs_source.html">IndexReader.cs</a>.</p>

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	<td class="memname">using <a class="el" href="_documents_writer_8cs.html#a5431a3a4edd067eec50ca39b5ea99c31">Similarity</a> = <a class="el" href="class_lucene_1_1_net_1_1_search_1_1_similarity.html">Lucene.Net.Search.Similarity</a></td>
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	<p>Definition at line <a class="el" href="_index_reader_8cs_source.html#l00024">24</a> of file <a class="el" href="_index_reader_8cs_source.html">IndexReader.cs</a>.</p>

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