package org.apache.lucene.demo;/** * Copyright 2004 The Apache Software Foundation * * 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. */import org.apache.lucene.store.Directory;import org.apache.lucene.store.FSDirectory;import org.apache.lucene.index.IndexReader;import org.apache.lucene.index.Term;//import org.apache.lucene.index.Term;/** Deletes documents from an index that do not contain a term. */public class DeleteFiles {    private DeleteFiles() {}                         // singleton  /** Deletes documents from an index that do not contain a term. */  public static void main(String[] args) {    String usage = "java org.apache.lucene.demo.DeleteFiles <unique_term>";    if (args.length == 0) {      System.err.println("Usage: " + usage);      System.exit(1);    }    try {      Directory directory = FSDirectory.getDirectory("index", false);      IndexReader reader = IndexReader.open(directory);      Term term = new Term("path", args[0]);      int deleted = reader.deleteDocuments(term);      System.out.println("deleted " + deleted + 			 " documents containing " + term);      // one can also delete documents by their internal id:      /*      for (int i = 0; i < reader.maxDoc(); i++) {        System.out.println("Deleting document with id " + i);        reader.delete(i);      }*/      reader.close();      directory.close();    } catch (Exception e) {      System.out.println(" caught a " + e.getClass() +			 "\n with message: " + e.getMessage());    }  }}