com.topsoft.botspider.util.MapAvroReadTool.java Source code

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Here is the source code for com.topsoft.botspider.util.MapAvroReadTool.java

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package com.topsoft.botspider.util;
/**
 * 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.InputStream;
import java.io.PrintStream;
import java.util.List;

import org.apache.avro.generic.GenericDatumReader;
import org.apache.avro.io.DatumReader;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;

import com.topsoft.botspider.avro.mapreduce.output.AvroMapOutputFormat;
import com.topsoft.botspider.io.MapAvroFile;

/** Reads a data file to get its schema. */
public class MapAvroReadTool implements Tool {

    @Override
    public String getName() {
        return "map";
    }

    @Override
    public String getShortDescription() {
        return "Get a record from Map Avro data file by key or get total record number.";
    }

    @SuppressWarnings({ "rawtypes", "unchecked" })
    @Override
    public int run(InputStream stdin, PrintStream out, PrintStream err, List<String> args) throws Exception {
        if (args.size() < 1) {
            err.println("Usage: input_file [-key key] [-count]");
            return 1;
        }

        String key = null;
        boolean bcount = false;

        for (int i = 0; i < args.size(); i++) {
            if ("-key".equals(args.get(i))) {
                key = args.get(i + 1);
                i++;
            } else if ("-count".equals(args.get(i))) {
                bcount = true;
            }

        }
        if (key == null)
            bcount = true;
        Configuration conf = new Configuration();
        conf.setClass(MapAvroFile.Reader.DATUM_READER_CLASS, GenericDatumReader.class, DatumReader.class);
        FileSystem fs = FileSystem.get(conf);
        Path input = new Path(args.get(0));
        Path datafile = new Path(input, MapAvroFile.DATA_FILE_NAME);
        Path indexfile = new Path(input, MapAvroFile.INDEX_FILE_NAME);
        MapAvroFile.Reader[] readers = null;
        if (fs.exists(datafile) && fs.exists(indexfile)) {
            // readers = new
            readers = new MapAvroFile.Reader[] { new MapAvroFile.Reader(fs, input.toString(), conf) };
        } else
            readers = AvroMapOutputFormat.getReaders(new Path(args.get(0)), conf);
        try {
            if (key != null) {
                Object obj = AvroMapOutputFormat.getEntry(readers, key);
                out.println(AvroUtils.toAvroString(obj));
            }
            if (bcount) {
                int total = 0;
                for (MapAvroFile.Reader reader : readers) {
                    total += reader.size();
                }
                out.println("Total record : " + total);
            }
        } finally {
            for (int i = 0; i < readers.length; i++) {
                try {
                    readers[i].close();
                } catch (Exception e) {

                }
            }
        }
        return 0;
    }
}