package prefuse.data.query;

import javax.swing.JComponent;

import prefuse.data.Table;
import prefuse.data.Tuple;
import prefuse.data.event.TupleSetListener;
import prefuse.data.expression.AbstractPredicate;
import prefuse.data.search.PrefixSearchTupleSet;
import prefuse.data.search.SearchTupleSet;
import prefuse.data.tuple.TupleSet;
import prefuse.util.ui.JSearchPanel;
import prefuse.visual.VisualTable;

/**
 * DynamicQueryBinding supporting text search over data values. Implementations
 * of the {@link prefuse.data.search.SearchTupleSet} class from the
 * {@link prefuse.data.search} package can be used to control the type of
 * search index used.
 * 
 * @author <a href="http://jheer.org">jeffrey heer</a>
 * @see prefuse.data.search.SearchTupleSet
 */
public class SearchQueryBinding extends DynamicQueryBinding {

    private SearchTupleSet m_set;
    private Listener m_lstnr;
    private Object m_lock;
    
    /**
     * Create a new SearchQueryBinding over the given table and data field.
     * @param t the Table to query
     * @param field the data field (Table column) to query
     */
    public SearchQueryBinding(Table t, String field) {
        this(t, field, new PrefixSearchTupleSet());
    }
    
    /**
     * Create a new SearchQueryBinding over the given table and data field, using
     * the specified SearchTupleSet instance. Use this constructor to choose
     * the type of search engine used, and to potentially reuse the same search
     * set over multiple dynamic query bindings.
     * @param t the Table to query
     * @param field the data field (Table column) to query
     * @param set the {@link prefuse.data.search.SearchTupleSet} to use.
     */
    public SearchQueryBinding(Table t, String field, SearchTupleSet set) {
        super(t, field);
        m_lstnr = new Listener();
        setPredicate(new SearchBindingPredicate());
        
        m_set = set;
        m_set.index(t.tuples(), field);
        m_set.addTupleSetListener(m_lstnr);
        
        if ( t instanceof VisualTable )
            m_lock = ((VisualTable)t).getVisualization();
    }
    
    /**
     * Return the SearchTupleSet used for conducting searches.
     * @return the {@link prefuse.data.search.SearchTupleSet} used by this
     * dynamic query binding.
     */
    public SearchTupleSet getSearchSet() {
        return m_set;
    }
    
    // ------------------------------------------------------------------------
    
    /**
     * Create a new search text panel for searching over the data.
     * @return a {@link prefuse.util.ui.JSearchPanel} bound to this
     * dynamic query.
     * @see prefuse.data.query.DynamicQueryBinding#createComponent()
     */
    public JComponent createComponent() {
        return createSearchPanel();
    }

    /**
     * Create a new search text panel for searching over the data.
     * @return a {@link prefuse.util.ui.JSearchPanel} bound to this
     * dynamic query.
     */
    public JSearchPanel createSearchPanel() {
        return createSearchPanel(m_set instanceof PrefixSearchTupleSet);
    }
    
    /**
     * Create a new search text panel for searching over the data.
     * @param monitorKeystrokes if true, each keystroke will cause the
     * search to be re-run (this is the default for prefix searches);
     * if false, searches will only re-run when the enter key is typed
     * (this is the default for the other search engine types).
     * @return a {@link prefuse.util.ui.JSearchPanel} bound to this
     * dynamic query.
     */
    public JSearchPanel createSearchPanel(boolean monitorKeystrokes) {
        JSearchPanel jsp = new JSearchPanel(m_set, m_field, monitorKeystrokes);
        if ( m_lock != null ) { jsp.setLock(m_lock); }
        return jsp;
    }
    
    // ------------------------------------------------------------------------
    
    private class SearchBindingPredicate extends AbstractPredicate {
        public boolean getBoolean(Tuple t) {
            String q = m_set.getQuery();
            return (q==null || q.length()==0 || m_set.containsTuple(t));
        }
        public void touch() {
            this.fireExpressionChange();
        }
    }
    
    private class Listener implements TupleSetListener {
        public void tupleSetChanged(TupleSet tset, Tuple[] added, Tuple[] removed) {
            ((SearchBindingPredicate)getPredicate()).touch();
        }        
    }

} // end of class SearchQueryBinding