C from the Term in Java

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C from the Term
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org.hibernate.search.FullTextQuery hibQuery = session.createFullTextQuery(query, Dvd.class); List<Dvd> results = hibQuery.list(); assert results.size() == 5 : "incorrect hit count"; assert results.get(0).getDescription() .equals("he's not a computer salesman"); for (Dvd dvd : results) { System.out.println(dvd.getDescription()); }
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Dvd.class.getName()).list())
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for (Object element : session.createQuery("from " + session.delete(element); tx.commit();
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CHAPTER 7 finally { session.close(); }
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Writing a Lucene query
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private void buildIndex(FullTextSession session, Transaction tx) { for (int x = 0; x < descs.length; x++) { Dvd dvd = new Dvd(); dvd.setDescription(descs[x]); dvd.setId(x); session.save(dvd); } tx.commit(); session.clear(); } } description:salesman
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D Generated query syntax
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he's not a computer salesman a once-successful salesman he hits the road as a traveling salesman a traveling salesman touting the wave of the future transforms into an aggressive, high-risk salesman
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Notice that we ve introduced a new class in addition to TermQuery. The Term class B takes a field name and a string to search for. It is then passed to the TermQuery constructor C to create the query. This example should illustrate why most queries are reduced to sets of TermQuerys. After all, queries are nothing more than a series of single terms. The generated query syntax is shown at D. Before we cover the use of several of the individual query-generation classes, let s discuss an important topic that can help with anticipating the text users enter in queries. This important topic is utilizing regular expressions to make sure that what users enter as a query is really what they intended to enter.
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SPECIAL CHARACTERS
With applications there s no way to anticipate what a user will enter as the text of a query. Toward the end of section 7.1.1 we discussed the problem with the (dash) character being misinterpreted as a Boolean NOT operator. You cannot expect the users of your application to know and understand that they will have to escape dashes with a backslash (that just won t happen). Well, surprise, it is not just the character you will have to consider escaping. Lucene uses several special characters to go about normal everyday tasks, and, as we ve shown in section 7.1.1, these could be misinterpreted if they were used as is in queries. Table 7.2 shows a list of those characters. How can we escape these special characters in our application when we have no control over how users enter their query strings Listing 7.6 is one example of how to accomplish this. Feel free to use this code as you see fit in your applications. If you re running a Java version earlier than 1.5, the QueryParser class supplies a method that accomplishes the same results: public static String escape(String s).
Building custom queries programmatically
Table 7.2 Special character Special characters and their interpretation Where it is used shorthand for AND shorthand for NOT additional shorthand for AND additional shorthand for OR additional shorthand for NOT grouping parentheses exclusive lower bound exclusive upper bound Special character Where it is used inclusive lower bound inclusive upper bound term boost phrase query delimiter proximity query slop factor fuzzy query minimumumSimilarity multicharacter wildcard single-character wildcard fieldname/term delimiter escape character
+ && || !
[ ] ^ ~ * : \
Listing 7.6
Programmatically escaping special characters from user-entered queries Define the special characters
private static final String[] SPECIALS = new String[]{ "+", "-", "&&", "||", "!", "(", ")", "{", "}", "[", "]", "^", "\"", "~", "*", " ", ":", "\\" }; protected String escapeSpecials(String clientQuery) { String regexOr = ""; for (String special : SPECIALS) { regexOr += (special .equals(SPECIALS[0]) "" : "|") + "\\" + special.substring(0, 1); } clientQuery = clientQuery .replaceAll("( <!\\\\)(" + regexOr + ")", "\\\\$1"); return clientQuery.trim(); }
C regex string D characters for specials C we
Substitute escaped
Build the
We start B by defining the special characters in a String array. In the loop at build our regular expression. In this case the expression string is
\+|\-|\&|\||\!|\(|\)|\{|\}|\[|\]|\^|\"|\~|\*|\ |\:|\\
As you d expect, this is each of the special characters preceded by the escape character \ and separated from the next special character by the | (OR) character. The meat of the code is D. The String.replaceAll() java method steps through the clientQuery string and replaces any of the special characters it finds with that special
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