Example usage for org.apache.lucene.search.suggest.fst WFSTCompletionLookup lookup

Introduction

In this page you can find the example usage for org.apache.lucene.search.suggest.fst WFSTCompletionLookup lookup.

Prototype

public List<LookupResult> lookup(CharSequence key, boolean onlyMorePopular, int num) throws IOException 

Source Link

Document

Look up a key and return possible completion for this key.

Usage

From source file:org.opengrok.suggest.SuggesterProjectData.java

License:Open Source License

/**
 * Looks up the terms in the WFST data structure.
 * @param field term field/*from ww w. j ava  2  s .co  m*/
 * @param prefix prefix the returned terms must contain
 * @param resultSize number of terms to return
 * @return terms with highest score
 */
public List<Lookup.LookupResult> lookup(final String field, final String prefix, final int resultSize) {
    lock.readLock().lock();
    try {
        WFSTCompletionLookup lookup = lookups.get(field);
        if (lookup == null) {
            logger.log(Level.WARNING, "No WFST for field {0} in {1}", new Object[] { field, suggesterDir });
            return Collections.emptyList();
        }
        return lookup.lookup(prefix, false, resultSize);
    } catch (IOException e) {
        logger.log(Level.WARNING, "Could not perform lookup in {0} for {1}:{2}",
                new Object[] { suggesterDir, field, prefix });
    } finally {
        lock.readLock().unlock();
    }
    return Collections.emptyList();
}

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