cmd.freebase2rdf.java Source code

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Here is the source code for cmd.freebase2rdf.java

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/*
 * 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.
 */

package cmd;

import static com.hp.hpl.jena.sparql.util.Utils.nowAsString;

import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStreamReader;
import java.util.zip.GZIPOutputStream;

import org.apache.commons.compress.compressors.bzip2.BZip2CompressorInputStream;
import org.openjena.atlas.logging.ProgressLogger;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.kasabi.labs.freebase.Freebase2RDF;

public class freebase2rdf {

    public static final Logger log = LoggerFactory.getLogger(freebase2rdf.class);

    public static void main(String[] args) throws Exception {
        if (args.length != 2) {
            usage();
        }
        File input = new File(args[0]);
        if (!input.exists())
            error("File " + input.getAbsolutePath() + " does not exist.");
        if (!input.canRead())
            error("Cannot read file " + input.getAbsolutePath());
        if (!input.isFile())
            error("Not a file " + input.getAbsolutePath());
        File output = new File(args[1]);
        if (output.exists())
            error("Output file " + output.getAbsolutePath()
                    + " already exists, this program do not override existing files.");
        if (output.canWrite())
            error("Cannot write file " + output.getAbsolutePath());
        if (output.isDirectory())
            error("Not a file " + output.getAbsolutePath());
        if (!output.getName().endsWith(".nt.gz"))
            error("Output filename should end with .nt.gz, this is the only format supported.");

        BufferedReader in = new BufferedReader(
                new InputStreamReader(new BZip2CompressorInputStream(new FileInputStream(input))));
        BufferedOutputStream out = new BufferedOutputStream(new GZIPOutputStream(new FileOutputStream(output)));
        String line;

        ProgressLogger progressLogger = new ProgressLogger(log, "lines", 100000, 1000000);
        progressLogger.start();
        Freebase2RDF freebase2rdf = null;
        try {
            freebase2rdf = new Freebase2RDF(out);
            while ((line = in.readLine()) != null) {
                freebase2rdf.send(line);
                progressLogger.tick();
            }
        } finally {
            if (freebase2rdf != null)
                freebase2rdf.close();
        }
        print(log, progressLogger);
    }

    private static void usage() {
        System.err.println(
                "Usage: Freebase2RDF </path/to/freebase-datadump-quadruples.tsv.bz2> </path/to/filename.nt.gz>");
        System.exit(0);
    }

    private static void error(String message) {
        System.err.println(message);
        System.exit(0);
    }

    private static void print(Logger log, ProgressLogger monitor) {
        long time = monitor.finish();
        long total = monitor.getTicks();
        float elapsedSecs = time / 1000F;
        float rate = (elapsedSecs != 0) ? total / elapsedSecs : 0;
        String str = String.format("Total: %,d lines : %,.2f seconds : %,.2f lines/sec [%s]", total, elapsedSecs,
                rate, nowAsString());
        log.info(str);
    }

}