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4.6. Bridges

When mapping entities, Lucene represents all index fields as strings. All entity properties annotated with @Field are converted to strings to be indexed. Built-in bridges automatically translates properties for the Lucene-based Query API. The bridges can be customized to gain control over the translation process.
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4.6.1. Built-in Bridges
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The Lucene-based Query API includes a set of built-in bridges between a Java property type and its full text representation.
null
Per default null elements are not indexed. Lucene does not support null elements. However, in some situation it can be useful to insert a custom token representing the null value. See Section 4.1.2, “@Field” for more information.
java.lang.String
Strings are indexed, as are:
  • short, Short
  • integer, Integer
  • long, Long
  • float, Float
  • double, Double
  • BigInteger
  • BigDecimal
Numbers are converted into their string representation. Note that numbers cannot be compared by Lucene, or used in ranged queries out of the box, and must be padded

Note

Using a Range query has disadvantages. An alternative approach is to use a Filter query which will filter the result query to the appropriate range.
The Query Module supports using a custom StringBridge. See Section 4.6.2, “Custom Bridges”.
java.util.Date
Dates are stored as yyyyMMddHHmmssSSS in GMT time (200611072203012 for Nov 7th of 2006 4:03PM and 12ms EST). When using a TermRangeQuery, dates are expressed in GMT.
@DateBridge defines the appropriate resolution to store in the index, for example: @DateBridge(resolution=Resolution.DAY). The date pattern will then be truncated accordingly. 
@Indexed
public class Meeting {
    @Field(analyze=Analyze.NO)
    @DateBridge(resolution=Resolution.MINUTE)
    private Date date;
    ...
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The default Date bridge uses Lucene's DateTools to convert from and to String. All dates are expressed in GMT time. Implement a custom date bridge in order to store dates in a fixed time zone.
java.net.URI, java.net.URL
URI and URL are converted to their string representation
java.lang.Class
Class are converted to their fully qualified class name. The thread context classloader is used when the class is rehydrated
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