Lucene example source code file (TestApp.java)

This example Lucene source code file (TestApp.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Lucene tags/keywords

bufferedwriter, class, class, fileinputstream, fileoutputstream, io, object, object, outputstream, reader, reflection, snowballprogram, snowballprogram, stringbuffer, stringbuffer, throwable

The Lucene TestApp.java source code

/*

Copyright (c) 2001, Dr Martin Porter
Copyright (c) 2002, Richard Boulton
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

    * Redistributions of source code must retain the above copyright notice,
    * this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright
    * notice, this list of conditions and the following disclaimer in the
    * documentation and/or other materials provided with the distribution.
    * Neither the name of the copyright holders nor the names of its contributors
    * may be used to endorse or promote products derived from this software
    * without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

package org.tartarus.snowball;

import java.lang.reflect.Method;
import java.io.Reader;
import java.io.Writer;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.OutputStream;
import java.io.FileOutputStream;

public class TestApp {
    private static void usage()
    {
        System.err.println("Usage: TestApp <algorithm>  [-o 
]");
    }

    public static void main(String [] args) throws Throwable {
	if (args.length < 2) {
            usage();
            return;
        }

	Class<? extends SnowballProgram> stemClass = Class.forName("org.tartarus.snowball.ext." +
					args[0] + "Stemmer").asSubclass(SnowballProgram.class);
        SnowballProgram stemmer = stemClass.newInstance();
	Method stemMethod = stemClass.getMethod("stem", new Class[0]);

	Reader reader;
	reader = new InputStreamReader(new FileInputStream(args[1]));
	reader = new BufferedReader(reader);

	StringBuffer input = new StringBuffer();

        OutputStream outstream;

	if (args.length > 2) {
            if (args.length == 4 && args[2].equals("-o")) {
                outstream = new FileOutputStream(args[3]);
            } else {
                usage();
                return;
            }
	} else {
	    outstream = System.out;
	}
	Writer output = new OutputStreamWriter(outstream);
	output = new BufferedWriter(output);

	int repeat = 1;
	if (args.length > 4) {
	    repeat = Integer.parseInt(args[4]);
	}

	Object [] emptyArgs = new Object[0];
	int character;
	while ((character = reader.read()) != -1) {
	    char ch = (char) character;
	    if (Character.isWhitespace(ch)) {
		if (input.length() > 0) {
		    stemmer.setCurrent(input.toString());
		    for (int i = repeat; i != 0; i--) {
			stemMethod.invoke(stemmer, emptyArgs);
		    }
		    output.write(stemmer.getCurrent());
		    output.write('\n');
		    input.delete(0, input.length());
		}
	    } else {
		input.append(Character.toLowerCase(ch));
	    }
	}
	output.flush();
    }
}