package cc.twittertools.corpus.demo;
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.document.Field;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.queryParser.QueryParser;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.ScoreDoc;
import org.apache.lucene.search.TopDocs;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.MMapDirectory;
import org.apache.lucene.util.Version;
/**
* Reference implementation for searching statuses.
*/
public class SearchStatuses {
private SearchStatuses() {}
private static final String INDEX_OPTION = "index";
private static final String QUERY_OPTION = "query";
private static final String NUM_HITS_OPTION = "num_hits";
@SuppressWarnings("static-access")
public static void main(String[] args) throws Exception {
Options options = new Options();
options.addOption(OptionBuilder.withArgName("path").hasArg()
.withDescription("index location").create(INDEX_OPTION));
options.addOption(OptionBuilder.withArgName("num").hasArg()
.withDescription("number of hits to return").create(NUM_HITS_OPTION));
options.addOption(OptionBuilder.withArgName("query").hasArg()
.withDescription("query").create(QUERY_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(QUERY_OPTION) || !cmdline.hasOption(INDEX_OPTION)) {
HelpFormatter formatter = new HelpFormatter();
formatter.printHelp(SearchStatuses.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);
}
int numHits = 10;
try {
if (cmdline.hasOption(NUM_HITS_OPTION)) {
numHits = Integer.parseInt(cmdline.getOptionValue(NUM_HITS_OPTION));
}
} catch (NumberFormatException e) {
System.err.println("Invalid " + NUM_HITS_OPTION + ": " + cmdline.getOptionValue(NUM_HITS_OPTION));
System.exit(-1);
}
PrintStream out = new PrintStream(System.out, true, "UTF-8");
Directory dir = new MMapDirectory(indexLocation);
IndexReader reader = IndexReader.open(dir);
IndexSearcher searcher = new IndexSearcher(reader);
QueryParser qparser = new QueryParser(Version.LUCENE_31, IndexStatuses.StatusField.TEXT.name,
IndexStatuses.ANALYZER);
Query query = qparser.parse(cmdline.getOptionValue(QUERY_OPTION));
System.out.println("Query: " + query);
TopDocs rs = searcher.search(query, numHits);
for (ScoreDoc scoreDoc : rs.scoreDocs) {
Document hit = searcher.doc(scoreDoc.doc);
Field created = hit.getField(IndexStatuses.StatusField.CREATED_AT.name);
out.println(String.format("%s\t%s\t%s\t%s",
hit.getField(IndexStatuses.StatusField.ID.name).stringValue(),
hit.getField(IndexStatuses.StatusField.SCREEN_NAME.name).stringValue(),
(created == null ? "" : created.stringValue()),
hit.getField(IndexStatuses.StatusField.TEXT.name).stringValue()));
}
searcher.close();
reader.clone();
}
}