Swing Hacks

Search Through JTables Easily #26

Chapter 3, Tables and Trees

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135

HACK

public int getRowCount( ) {

return (tableModel == null) ? 0 : rowToModelIndex.size( );

}

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);

}

public void setValueAt(Object aValue, int row, int column) {

tableModel.setValueAt(aValue, getModelRow(row), column);

}

Indexing

Lucene is a document indexing and searching tool, available from http://

lucene.apache.org/. To incorporate it into a Java application, you simply need

to put its JAR file, typically named something like lucene-

version.jar, into

your classpath. For this hack, you’ll need the following

import statements:

import org.apache.lucene.store.*;

import org.apache.lucene.document.*;

import org.apache.lucene.analysis.*;

import org.apache.lucene.index.*;

import org.apache.lucene.search.*;

import org.apache.lucene.queryParser.*;

Most developers use Lucene with documents, but you can fake it to index a

table model instead. First, you need to create a Lucene index, where all of

the internal Lucene links are stored. You should use a

RAMDirectory rather

than a file-based directory in order to keep everything portable. You’ll also

need an

Analyzer that helps communicate between data and the index, as

well as an

IndexWriter that actually writes to the index:

directory = new RAMDirectory( );

analyzer = new WhitespaceAnalyzer( );

IndexWriter writer = new IndexWriter(directory, analyzer, true);

For the purposes of indexing, think of every row as a document and every

column as a word or a set of words (called a

Field in Lucene-speak) for that

document. Now, loop through the table model’s rows, creating a new

Document for each row and add Fields per column:

for (int row=0; row < tableModel.getRowCount( ); row++){

Document document = new Document( );

//add fields

writer.addDocument(document);

}