Package com.day.cq.search.suggest

Interface SuggestionIndex

public interface SuggestionIndex

Represents a term suggestion index, with methods for reading from and writing to the index.

To persist single changes made to the index (add(), remove()), call save(). The possibly large-scale operations index() and delete() will save automatically.

Note: make sure to close() the index after usage to properly release affected resources, e.g. an underlying JCR session. This should be done in a try/finally block.

Method Summary

Modifier and Type	Method	Description
void	add(String term, String[] suggestions)	Adds suggestions for a given term to the index.
void	close()	Closes the index and releases all allocated resources with it, e.g.
void	delete()	Deletes the entire index.
void	index(List<Term> terms, int maxSuggestions, boolean minimize)	Extracts a suggestion index based on the given terms, weighted by their frequencies.
String[]	read(String term)	Looks up the suggestions for a given term.
void	remove(String term)	Removes the term and its suggestions from the index.
void	save()	Saves any single changes made to the index.

Method Details

read

String[] read(String term)
       throws RepositoryException

Looks up the suggestions for a given term.

Parameters:

term - partial word to look up in the index; one or more characters

Returns:

a list of suggestions or an empty array if no suggestions were found

Throws:

RepositoryException - if an unexpected repository error occurred

add

void add(String term,
 String[] suggestions)
  throws RepositoryException

Adds suggestions for a given term to the index. If the term already exists in the index, the previous suggestions will be overwritten.

To persist the change, save() must be called.

Parameters:

term - partial word for which the suggestions apply

suggestions - an array of suggestions

Throws:

RepositoryException - if an unexpected repository error occurred

remove

void remove(String term)
     throws RepositoryException

Removes the term and its suggestions from the index.

To persist the change, save() must be called.

Parameters:

term - partial word to remove from the index

Throws:

RepositoryException - if an unexpected repository error occurred

delete

void delete()
     throws RepositoryException

Deletes the entire index.

Changes will be persisted automatically.

Throws:

RepositoryException - if an unexpected repository error occurred

save

void save()
   throws RepositoryException

Saves any single changes made to the index.

Throws:

RepositoryException - if an unexpected repository error occurred

close

void close()
    throws RepositoryException

Closes the index and releases all allocated resources with it, e.g. the underlying JCR session. After this has been called, all methods will fail if called.

Throws:

RepositoryException - if an unexpected repository error occurred

index

void index(List<Term> terms,
 int maxSuggestions,
 boolean minimize)
    throws RepositoryException

Extracts a suggestion index based on the given terms, weighted by their frequencies. Will create all partial words starting with one letter, two letters and so on, for which full words exist, and will add up to the given maximum number of suggested terms for each partial word, weighted by the frequency.

Changes will be persisted automatically.

Parameters:

terms - a list of Terms, with the string term and the frequency

maxSuggestions - the maximum number of suggestion per term

minimize - Whether the index should be minimized. That means (longer) term prefixes that result in only one suggestion should not be indexed; only the first prefix that will result in this single suggestion would be stored, but not for the remaining letters of the suggested word.

Throws:

RepositoryException - if an unexpected repository error occurred