cc.twittertools.index.ExtractTweetidsFromIndex.java Source code

Introduction

Here is the source code for cc.twittertools.index.ExtractTweetidsFromIndex.java

Source

/**
 * Twitter Tools
 *
 * 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.
 */

package cc.twittertools.index;

import java.io.File;
import java.io.PrintStream;

import org.apache.commons.cli.CommandLine;
import org.apache.commons.cli.CommandLineParser;
import org.apache.commons.cli.GnuParser;
import org.apache.commons.cli.HelpFormatter;
import org.apache.commons.cli.OptionBuilder;
import org.apache.commons.cli.Options;
import org.apache.commons.cli.ParseException;
import org.apache.lucene.document.Document;
import org.apache.lucene.index.DirectoryReader;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.store.FSDirectory;

import cc.twittertools.index.IndexStatuses.StatusField;

/**
 * Reference implementation for indexing statuses.
 */
public class ExtractTweetidsFromIndex {
    private ExtractTweetidsFromIndex() {
    }

    private static final String INDEX_OPTION = "index";

    @SuppressWarnings("static-access")
    public static void main(String[] args) throws Exception {
        Options options = new Options();

        options.addOption(
                OptionBuilder.withArgName("dir").hasArg().withDescription("index location").create(INDEX_OPTION));

        CommandLine cmdline = null;
        CommandLineParser parser = new GnuParser();
        try {
            cmdline = parser.parse(options, args);
        } catch (ParseException exp) {
            System.err.println("Error parsing command line: " + exp.getMessage());
            System.exit(-1);
        }

        if (!cmdline.hasOption(INDEX_OPTION)) {
            HelpFormatter formatter = new HelpFormatter();
            formatter.printHelp(ExtractTweetidsFromIndex.class.getName(), options);
            System.exit(-1);
        }

        File indexLocation = new File(cmdline.getOptionValue(INDEX_OPTION));
        if (!indexLocation.exists()) {
            System.err.println("Error: " + indexLocation + " does not exist!");
            System.exit(-1);
        }

        IndexReader reader = DirectoryReader.open(FSDirectory.open(indexLocation));
        PrintStream out = new PrintStream(System.out, true, "UTF-8");
        for (int i = 0; i < reader.maxDoc(); i++) {
            Document doc = reader.document(i);
            out.println(doc.getField(StatusField.ID.name).stringValue() + "\t"
                    + doc.getField(StatusField.SCREEN_NAME.name).stringValue());
        }
        out.close();
        reader.close();
    }
}