/*
* Cloud9: A MapReduce Library for Hadoop
*
* 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 edu.umd.cloud9.collection.aquaint2;
import java.io.IOException;
import java.util.Arrays;
import java.util.List;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.FSDataInputStream;
import org.apache.hadoop.fs.FSDataOutputStream;
import org.apache.hadoop.fs.FileSystem;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.util.LineReader;
import org.apache.log4j.Logger;
import com.google.common.base.Preconditions;
import com.google.common.collect.Lists;
import edu.umd.cloud9.collection.DocnoMapping;
public class Aquaint2DocnoMapping implements DocnoMapping {
private static final Logger LOG = Logger.getLogger(Aquaint2DocnoMapping.class);
private String[] docids;
@Override
public int getDocno(String docid) {
Preconditions.checkNotNull(docid);
return Arrays.binarySearch(docids, docid);
}
@Override
public String getDocid(int docno) {
Preconditions.checkArgument(docno > 0);
return docids[docno];
}
@Override
public void loadMapping(Path p, FileSystem fs) throws IOException {
docids = Aquaint2DocnoMapping.readDocnoData(p, fs);
}
static public void writeDocnoData(Path input, Path output, FileSystem fs) throws IOException {
LOG.info("Writing docno data to " + output);
LineReader reader = new LineReader(fs.open(input));
List<String> list = Lists.newArrayList();
LOG.info("Reading " + input);
int cnt = 0;
Text line = new Text();
while (reader.readLine(line) > 0) {
String[] arr = line.toString().split("\\t");
list.add(arr[0]);
cnt++;
if (cnt % 100000 == 0) {
LOG.info(cnt + " docs");
}
}
reader.close();
LOG.info(cnt + " docs total. Done!");
cnt = 0;
LOG.info("Writing " + output);
FSDataOutputStream out = fs.create(output, true);
out.writeInt(list.size());
for (int i = 0; i < list.size(); i++) {
out.writeUTF(list.get(i));
cnt++;
if (cnt % 100000 == 0) {
LOG.info(cnt + " docs");
}
}
out.close();
LOG.info(cnt + " docs total. Done!");
}
static public String[] readDocnoData(Path p, FileSystem fs) throws IOException {
LOG.warn("p: " + p);
FSDataInputStream in = fs.open(p);
// Docnos start at one, so we need an array that's one larger than number of docs.
int sz = in.readInt() + 1;
LOG.warn("creating array of length: " + sz);
String[] arr = new String[sz];
for (int i = 1; i < sz; i++) {
arr[i] = in.readUTF();
}
in.close();
// Can't leave the zero'th entry null, or else we might get a null pointer exception during a
// binary search on the array.
arr[0] = "";
return arr;
}
@Override
public Builder getBuilder() {
throw new UnsupportedOperationException();
}
public static void main(String[] args) throws IOException {
if (args.length < 2) {
System.out.println("usage: (list|getDocno|getDocid) [mapping-file] [docid/docno]");
System.exit(-1);
}
Configuration conf = new Configuration();
FileSystem fs = FileSystem.get(conf);
System.out.println("loading mapping file " + args[1]);
Aquaint2DocnoMapping mapping = new Aquaint2DocnoMapping();
mapping.loadMapping(new Path(args[1]), fs);
if (args[0].equals("list")) {
for (int i = 1; i < mapping.docids.length; i++) {
System.out.println(i + "\t" + mapping.docids[i]);
}
} else if (args[0].equals("getDocno")) {
System.out.println("looking up docno for \"" + args[2] + "\"");
int idx = mapping.getDocno(args[2]);
if (idx > 0) {
System.out.println(mapping.getDocno(args[2]));
} else {
System.err.print("Invalid docid!");
}
} else if (args[0].equals("getDocid")) {
try {
System.out.println("looking up docid for " + args[2]);
System.out.println(mapping.getDocid(Integer.parseInt(args[2])));
} catch (Exception e) {
System.err.print("Invalid docno!");
}
} else {
System.out.println("Invalid command!");
System.out.println("usage: (list|getDocno|getDocid) [mapping-file] [docid/docno]");
}
}
}