/**
* 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.index.DirectoryReader;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.SlowCompositeReaderWrapper;
import org.apache.lucene.index.Terms;
import org.apache.lucene.index.TermsEnum;
import org.apache.lucene.store.FSDirectory;
import org.apache.lucene.util.BytesRef;
import cc.twittertools.index.IndexStatuses.StatusField;
public class ExtractTermStatisticsFromIndex {
private static final String INDEX_OPTION = "index";
private static final String MIN_OPTION = "min";
@SuppressWarnings("static-access")
public static void main(String[] args) throws Exception {
Options options = new Options();
options.addOption(OptionBuilder.withArgName("dir").hasArg()
.withDescription("index").create(INDEX_OPTION));
options.addOption(OptionBuilder.withArgName("num").hasArg()
.withDescription("min").create(MIN_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(ExtractTermStatisticsFromIndex.class.getName(), options);
System.exit(-1);
}
String indexLocation = cmdline.getOptionValue(INDEX_OPTION);
int min = cmdline.hasOption(MIN_OPTION) ?
Integer.parseInt(cmdline.getOptionValue(MIN_OPTION)) : 1;
PrintStream out = new PrintStream(System.out, true, "UTF-8");
IndexReader reader = DirectoryReader.open(FSDirectory.open(new File(indexLocation)));
Terms terms = SlowCompositeReaderWrapper.wrap(reader).terms(StatusField.TEXT.name);
TermsEnum termsEnum = terms.iterator(TermsEnum.EMPTY);
long missingCnt = 0;
int skippedTerms = 0;
BytesRef bytes = new BytesRef();
while ( (bytes = termsEnum.next()) != null) {
byte[] buf = new byte[bytes.length];
System.arraycopy(bytes.bytes, 0, buf, 0, bytes.length);
String term = new String(buf, "UTF-8");
int df = termsEnum.docFreq();
long cf = termsEnum.totalTermFreq();
if ( df < min) {
skippedTerms++;
missingCnt += cf;
continue;
}
out.println(term + "\t" + df + "\t" + cf);
}
reader.close();
out.close();
System.err.println("skipped terms: " + skippedTerms + ", cnt: " + missingCnt);
}
}