create barcode image c# Manually applying an analyzer to a query in Java

Print ECC200 in Java Manually applying an analyzer to a query

Manually applying an analyzer to a query
Generating Data Matrix ECC200 In Java
Using Barcode drawer for Java Control to generate, create Data Matrix image in Java applications.
www.OnBarcode.com
Decode DataMatrix In Java
Using Barcode scanner for Java Control to read, scan read, scan image in Java applications.
www.OnBarcode.com
Some query types allow the application of an analyzer out of the box. At the same time, many more queries don t allow it. This section demonstrates how to apply an analyzer to a query by taking a query string and manually applying a StandardAnalyzer analyzer to it. This enables you to apply whatever analyzers you wish to a multifield query and combine them into a BooleanQuery query. Listing 7.3 shows how to do this.
EAN128 Printer In Java
Using Barcode creator for Java Control to generate, create UCC-128 image in Java applications.
www.OnBarcode.com
Print PDF417 In Java
Using Barcode generator for Java Control to generate, create PDF-417 2d barcode image in Java applications.
www.OnBarcode.com
Listing 7.3 Manually applying an analyzer to a query
Encode Linear 1D Barcode In Java
Using Barcode printer for Java Control to generate, create Linear 1D Barcode image in Java applications.
www.OnBarcode.com
Code 39 Printer In Java
Using Barcode maker for Java Control to generate, create Code39 image in Java applications.
www.OnBarcode.com
public class TestManualAnalyzer { public void testManualAnalyzer() throws Exception { String search = "The Little Pony"; Reader reader = new StringReader(search); Analyzer analyzer = new StandardAnalyzer();
Data Matrix Encoder In Java
Using Barcode printer for Java Control to generate, create DataMatrix image in Java applications.
www.OnBarcode.com
RM4SCC Encoder In Java
Using Barcode printer for Java Control to generate, create RoyalMail4SCC image in Java applications.
www.OnBarcode.com
Build query from this string Generate a reader for the Analyzer stream
ECC200 Reader In None
Using Barcode scanner for Software Control to read, scan read, scan image in Software applications.
www.OnBarcode.com
ECC200 Generator In None
Using Barcode creation for Word Control to generate, create Data Matrix image in Microsoft Word applications.
www.OnBarcode.com
Writing a Lucene query
QR Code ISO/IEC18004 Generation In Java
Using Barcode printer for Android Control to generate, create QR image in Android applications.
www.OnBarcode.com
UPC-A Supplement 2 Maker In VB.NET
Using Barcode generator for VS .NET Control to generate, create UPC-A Supplement 5 image in Visual Studio .NET applications.
www.OnBarcode.com
TokenStream stream = analyzer.tokenStream("title", reader); Token token = new Token(); token = stream.next(token);
Print EAN / UCC - 13 In None
Using Barcode generation for Online Control to generate, create EAN / UCC - 13 image in Online applications.
www.OnBarcode.com
Barcode Generation In Java
Using Barcode encoder for Android Control to generate, create Barcode image in Android applications.
www.OnBarcode.com
C TokenStream D
Create QR Code ISO/IEC18004 In None
Using Barcode printer for Font Control to generate, create QR Code image in Font applications.
www.OnBarcode.com
Barcode Generator In Visual Studio .NET
Using Barcode generation for VS .NET Control to generate, create Barcode image in .NET framework applications.
www.OnBarcode.com
Grab the first token
Data Matrix 2d Barcode Scanner In Visual C#
Using Barcode scanner for Visual Studio .NET Control to read, scan read, scan image in .NET applications.
www.OnBarcode.com
Decode Code 3 Of 9 In VS .NET
Using Barcode scanner for Visual Studio .NET Control to read, scan read, scan image in .NET applications.
www.OnBarcode.com
Instantiate a
Decoding Code 128B In Visual C#
Using Barcode scanner for .NET framework Control to read, scan read, scan image in .NET framework applications.
www.OnBarcode.com
Encode QR-Code In .NET Framework
Using Barcode maker for Visual Studio .NET Control to generate, create Quick Response Code image in .NET framework applications.
www.OnBarcode.com
BooleanQuery query = new BooleanQuery(); while (token != null) { if (token.termLength() != 0) { String term = new String(token.termBuffer(), 0, token.termLength()); //add it to the query by creating a TermQuery query.add(new TermQuery(new Term("title", term)), BooleanClause.Occur.SHOULD); } token = stream.next(token); } assert query.toString().equals( "title:little title:pony"): "incorrect query generated"; } }
E Create a term from the token F Build a TermQuery
G token and loop H generated query
Assert the
Grab the next
Because analyzers need input in the form of a Reader, we create one B for our input string. With this reader we can generate a TokenStream C and retrieve the first token from it D. We create the first term by creating a copy of the contents of the term buffer E. This way we can safely reuse the token. With this term we create a new TermQuery and add it to the BooleanQuery as the first clause F. We ve jumped the gun a little at F by programmatically creating an instance of a BooleanQuery before we discussed it. If you have a problem understanding it, hang in there because we talk about that in the next section. We re sure you ll understand it by the end of that section. We then get the next token and loop until the token stream is exhausted G; H asserts that the query equals "title:little title:pony". Now for what we talked about at the end of section 7.2.4, the fact that Hibernate Search allows you to retrieve at query time which analyzer was employed at index time. When you use separate analyzers per field to build an index, Hibernate Search provides a ScopedAnalyzer. The org.hibernate.search.util.ScopedAnalyzer class keeps track of all the analyzers specified in an entity and allows you to recall them as needed. An analyzer specified on all entities through the configuration specification is known as a global analyzer. In the event no explicit analyzer exists for a particular field, the global analyzer is returned. The next section contains an example of the ScopedAnalyzer and a discussion of when to use it and when not to.
Tokenization and fields
Using multiple analyzers in the same query
Once we retrieve the analyzers that were used to build the query, how do we employ them so that they can be applied to their individual fields as needed during a query If you use the QueryParser to build your query and that is a big if the ScopedAnalyzer class will automatically apply the specified analyzer to its matching field. Everything will be taken care of without the need for any intervention on your part. If you chose not to use the query parser, you re on your own, sort of. The ScopedAnalyzer class is your friend in this case. Why did we say, sort of Because you must manually implement the appropriate analyzer on your query. Listing 7.4 gives an example utilizing the ScopedEntity class from listing 7.2.
SearchTestCase
Listing 7.4, along with almost all of the tests in chapters 11, 12, and 13 and the remaining tests in this chapter, inherit from the SearchTestCase class. This class provides several utility methods used in the tests. SearchTestCase also inherits from HsiATestCase, and this class also provides several methods such as buildSessionFactory and configure. The individual test classes will override the methods in these two superclasses as needed to perform the tests.
Copyright © OnBarcode.com . All rights reserved.