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Lucene example source code file (ReutersContentSource.java)
This example Lucene source code file (ReutersContentSource.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.
The Lucene ReutersContentSource.java source code
package org.apache.lucene.benchmark.byTask.feeds;
/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.text.DateFormat;
import java.text.ParsePosition;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.Locale;
import org.apache.lucene.benchmark.byTask.utils.Config;
/**
* A {@link ContentSource} reading from the Reuters collection.
* <p>
* Config properties:
* <ul>
* <li>work.dir - path to the root of docs and indexes dirs (default
* <b>work).
* <li>docs.dir - path to the docs dir (default reuters-out).
* </ul>
*/
public class ReutersContentSource extends ContentSource {
private static final class DateFormatInfo {
DateFormat df;
ParsePosition pos;
}
private ThreadLocal<DateFormatInfo> dateFormat = new ThreadLocal();
private File dataDir = null;
private ArrayList<File> inputFiles = new ArrayList();
private int nextFile = 0;
private int iteration = 0;
@Override
public void setConfig(Config config) {
super.setConfig(config);
File workDir = new File(config.get("work.dir", "work"));
String d = config.get("docs.dir", "reuters-out");
dataDir = new File(d);
if (!dataDir.isAbsolute()) {
dataDir = new File(workDir, d);
}
inputFiles.clear();
collectFiles(dataDir, inputFiles);
if (inputFiles.size() == 0) {
throw new RuntimeException("No txt files in dataDir: "+dataDir.getAbsolutePath());
}
}
private synchronized DateFormatInfo getDateFormatInfo() {
DateFormatInfo dfi = dateFormat.get();
if (dfi == null) {
dfi = new DateFormatInfo();
// date format: 30-MAR-1987 14:22:36.87
dfi.df = new SimpleDateFormat("dd-MMM-yyyy kk:mm:ss.SSS",Locale.US);
dfi.df.setLenient(true);
dfi.pos = new ParsePosition(0);
dateFormat.set(dfi);
}
return dfi;
}
private Date parseDate(String dateStr) {
DateFormatInfo dfi = getDateFormatInfo();
dfi.pos.setIndex(0);
dfi.pos.setErrorIndex(-1);
return dfi.df.parse(dateStr.trim(), dfi.pos);
}
@Override
public void close() throws IOException {
// TODO implement?
}
@Override
public DocData getNextDocData(DocData docData) throws NoMoreDataException, IOException {
File f = null;
String name = null;
synchronized (this) {
if (nextFile >= inputFiles.size()) {
// exhausted files, start a new round, unless forever set to false.
if (!forever) {
throw new NoMoreDataException();
}
nextFile = 0;
iteration++;
}
f = inputFiles.get(nextFile++);
name = f.getCanonicalPath() + "_" + iteration;
}
BufferedReader reader = new BufferedReader(new FileReader(f));
try {
// First line is the date, 3rd is the title, rest is body
String dateStr = reader.readLine();
reader.readLine();// skip an empty line
String title = reader.readLine();
reader.readLine();// skip an empty line
StringBuilder bodyBuf = new StringBuilder(1024);
String line = null;
while ((line = reader.readLine()) != null) {
bodyBuf.append(line).append(' ');
}
reader.close();
addBytes(f.length());
Date date = parseDate(dateStr.trim());
docData.clear();
docData.setName(name);
docData.setBody(bodyBuf.toString());
docData.setTitle(title);
docData.setDate(date);
return docData;
} finally {
reader.close();
}
}
@Override
public synchronized void resetInputs() throws IOException {
super.resetInputs();
nextFile = 0;
iteration = 0;
}
}
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