How do I implement search for int values in hibernate search?

Question

I'm trying to perform a search for an integer value. I have annotated the param with @Field like this:

@Field(name = "confirmedCount", index = UN_TOKENIZED, store = Store.YES)
public int getConfirmedCount() {
   return stuff.size();
}

I then perform a range search with luke:

confirmedCount:[5 TO 100]

the result that I get back is empty. I then try:

confirmedCount:[1 TO 2]

The result is:

name confirmedCount
b    1
a    1
d    19
c    2

So my question is: Why do I get this response and how do I solve it? I use hibernate search 3.0.1.GA

Answer 1

Ok I guess the answer to my question is RTFM! The documentation clearly states:

Numbers are converted into their string representation. Note that numbers cannot be compared by Lucene (ie used in ranged queries) out of the box: they have to be padded

So we need to implement a class bridge:

public class PaddedIntegerBridge implements StringBridge {

    private int PADDING = 5;

    public String objectToString(Object object) {
        String rawInteger = ( (Integer) object ).toString();
        if (rawInteger.length() > PADDING)
            throw new IllegalArgumentException( "Try to pad on a number too big" );
        StringBuilder paddedInteger = new StringBuilder( );
        for ( int padIndex = rawInteger.length() ; padIndex < PADDING ; padIndex++ ) {
            paddedInteger.append('0');
        }
        return paddedInteger.append( rawInteger ).toString();
    }
}

Then we need to annotate the field so that it get indexed:

@Field(name = "confirmedCount", index = UN_TOKENIZED, store = Store.YES, bridge = @FieldBridge(impl = PaddedIntegerBridge.class))
    public int getConfirmedCount() {
        return stuff.size();
    }

Then in my searches I just need to make use of this bridge when creating a query and voila it works =)

Some testing with Luke:

confirmedCount:[00005 TO 00100]

name confirmedCount
g    00006
d    00019