package org.apache.lucene.swing.models;
/**
* Copyright 2005 The Apache Software Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import java.util.ArrayList;
import javax.swing.event.TableModelEvent;
import javax.swing.event.TableModelListener;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.TableModel;
import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.core.WhitespaceAnalyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.document.Fieldable;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.queryParser.MultiFieldQueryParser;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.ScoreDoc;
import org.apache.lucene.store.RAMDirectory;
import org.apache.lucene.swing.models.ListSearcher.CountingCollector;
import org.apache.lucene.util.Version;
/**
* This is a TableModel that encapsulates Lucene
* search logic within a TableModel implementation.
* It is implemented as a TableModel decorator,
* similar to the TableSorter demo from Sun that decorates
* a TableModel and provides sorting functionality. The benefit
* of this architecture is that you can decorate any TableModel
* implementation with this searching table model -- making it
* easy to add searching functionality to existing JTables -- or
* making new search capable table lucene.
*
* <p>This decorator works by holding a reference to a decorated ot inner
* TableModel. All data is stored within that table model, not this
* table model. Rather, this table model simply manages links to
* data in the inner table model according to the search. All methods on
* TableSearcher forward to the inner table model with subtle filtering
* or alteration according to the search criteria.
*
* <p>Using the table model:
*
* Pass the TableModel you want to decorate in at the constructor. When
* the TableModel initializes, it displays all search results. Call
* the search method with any valid Lucene search String and the data
* will be filtered by the search string. Users can always clear the search
* at any time by searching with an empty string. Additionally, you can
* add a button calling the clearSearch() method.
*
*/
public class TableSearcher extends AbstractTableModel {
/**
* The inner table model we are decorating
*/
protected TableModel tableModel;
/**
* This listener is used to register this class as a listener to
* the decorated table model for update events
*/
private TableModelListener tableModelListener;
/**
* these keeps reference to the decorated table model for data
* only rows that match the search criteria are linked
*/
private ArrayList<Integer> rowToModelIndex = new ArrayList<Integer>();
//Lucene stuff.
/**
* In memory lucene index
*/
private RAMDirectory directory;
/**
* Cached lucene analyzer
*/
private Analyzer analyzer;
/**
* Links between this table model and the decorated table model
* are maintained through links based on row number. This is a
* key constant to denote "row number" for indexing
*/
private static final String ROW_NUMBER = "ROW_NUMBER";
/**
* Cache the current search String. Also used internally to
* key whether there is an active search running or not. i.e. if
* searchString is null, there is no active search.
*/
private String searchString = null;
/**
* @param tableModel The table model to decorate
*/
public TableSearcher(TableModel tableModel) {
analyzer = new WhitespaceAnalyzer(Version.LUCENE_CURRENT);
tableModelListener = new TableModelHandler();
setTableModel(tableModel);
tableModel.addTableModelListener(tableModelListener);
clearSearchingState();
}
/**
*
* @return The inner table model this table model is decorating
*/
public TableModel getTableModel() {
return tableModel;
}
/**
* Set the table model used by this table model
* @param tableModel The new table model to decorate
*/
public void setTableModel(TableModel tableModel) {
//remove listeners if there...
if (this.tableModel != null) {
this.tableModel.removeTableModelListener(tableModelListener);
}
this.tableModel = tableModel;
if (this.tableModel != null) {
this.tableModel.addTableModelListener(tableModelListener);
}
//recalculate the links between this table model and
//the inner table model since the decorated model just changed
reindex();
// let all listeners know the table has changed
fireTableStructureChanged();
}
/**
* Reset the search results and links to the decorated (inner) table
* model from this table model.
*/
private void reindex() {
try {
// recreate the RAMDirectory
directory = new RAMDirectory();
IndexWriter writer = new IndexWriter(directory, new IndexWriterConfig(
Version.LUCENE_CURRENT, analyzer));
// iterate through all rows
for (int row=0; row < tableModel.getRowCount(); row++){
//for each row make a new document
Document document = new Document();
//add the row number of this row in the decorated table model
//this will allow us to retrieve the results later
//and map this table model's row to a row in the decorated
//table model
document.add(new Field(ROW_NUMBER, "" + row, Field.Store.YES, Field.Index.ANALYZED));
//iterate through all columns
//index the value keyed by the column name
//NOTE: there could be a problem with using column names with spaces
for (int column=0; column < tableModel.getColumnCount(); column++){
String columnName = tableModel.getColumnName(column);
String columnValue = String.valueOf(tableModel.getValueAt(row, column)).toLowerCase();
document.add(new Field(columnName, columnValue, Field.Store.YES, Field.Index.ANALYZED));
}
writer.addDocument(document);
}
writer.optimize();
writer.close();
} catch (Exception e){
e.printStackTrace();
}
}
/**
* @return The current lucene analyzer
*/
public Analyzer getAnalyzer() {
return analyzer;
}
/**
* @param analyzer The new analyzer to use
*/
public void setAnalyzer(Analyzer analyzer) {
this.analyzer = analyzer;
//reindex from the model with the new analyzer
reindex();
//rerun the search if there is an active search
if (isSearching()){
search(searchString);
}
}
/**
* Run a new search.
*
* @param searchString Any valid lucene search string
*/
public void search(String searchString){
//if search string is null or empty, clear the search == search all
if (searchString == null || searchString.equals("")){
clearSearchingState();
fireTableDataChanged();
return;
}
try {
//cache search String
this.searchString = searchString;
//make a new index searcher with the in memory (RAM) index.
IndexSearcher is = new IndexSearcher(directory, true);
//make an array of fields - one for each column
String[] fields = new String[tableModel.getColumnCount()];
for (int t=0; t<tableModel.getColumnCount(); t++){
fields[t]=tableModel.getColumnName(t);
}
//build a query based on the fields, searchString and cached analyzer
//NOTE: This is an area for improvement since the MultiFieldQueryParser
// has some weirdness.
MultiFieldQueryParser parser = new MultiFieldQueryParser(Version.LUCENE_CURRENT, fields, analyzer);
Query query = parser.parse(searchString);
//reset this table model with the new results
resetSearchResults(is, query);
} catch (Exception e){
e.printStackTrace();
}
//notify all listeners that the table has been changed
fireTableStructureChanged();
}
/**
*
* @param hits The new result set to set this table to.
*/
private void resetSearchResults(IndexSearcher searcher, Query query) {
try {
//clear our index mapping this table model rows to
//the decorated inner table model
rowToModelIndex.clear();
CountingCollector countingCollector = new CountingCollector();
searcher.search(query, countingCollector);
ScoreDoc[] hits = searcher.search(query, countingCollector.numHits).scoreDocs;
//iterate through the hits
//get the row number stored at the index
//that number is the row number of the decorated
//table model row that we are mapping to
for (int t=0; t<hits.length; t++){
Document document = searcher.doc(hits[t].doc);
Fieldable field = document.getField(ROW_NUMBER);
rowToModelIndex.add(Integer.valueOf(field.stringValue()));
}
} catch (Exception e){
e.printStackTrace();
}
}
private int getModelRow(int row){
return rowToModelIndex.get(row);
}
/**
* Clear the currently active search
* Resets the complete dataset of the decorated
* table model.
*/
private void clearSearchingState(){
searchString = null;
rowToModelIndex.clear();
for (int t=0; t<tableModel.getRowCount(); t++){
rowToModelIndex.add(t);
}
}
// TableModel interface methods
public int getRowCount() {
return (tableModel == null) ? 0 : rowToModelIndex.size();
}
public int getColumnCount() {
return (tableModel == null) ? 0 : tableModel.getColumnCount();
}
@Override
public String getColumnName(int column) {
return tableModel.getColumnName(column);
}
@Override
public Class<?> getColumnClass(int column) {
return tableModel.getColumnClass(column);
}
@Override
public boolean isCellEditable(int row, int column) {
return tableModel.isCellEditable(getModelRow(row), column);
}
public Object getValueAt(int row, int column) {
return tableModel.getValueAt(getModelRow(row), column);
}
@Override
public void setValueAt(Object aValue, int row, int column) {
tableModel.setValueAt(aValue, getModelRow(row), column);
}
private boolean isSearching() {
return searchString != null;
}
private class TableModelHandler implements TableModelListener {
public void tableChanged(TableModelEvent e) {
// If we're not searching, just pass the event along.
if (!isSearching()) {
clearSearchingState();
reindex();
fireTableChanged(e);
return;
}
// Something has happened to the data that may have invalidated the search.
reindex();
search(searchString);
fireTableDataChanged();
return;
}
}
}