Examples of org.apache.lucene.index.IndexReader.deleteDocuments()

Class org.apache.lucene.index.IndexReader

Examples of org.apache.lucene.index.IndexReader.deleteDocuments()

org.apache.lucene.index.IndexReader.deleteDocuments()
Deletes all documents that have a given term indexed. This is useful if one uses a document field to hold a unique ID string for the document. Then to delete such a document, one merely constructs a term with the appropriate field and the unique ID string as its text and passes it to this method. See {@link #deleteDocument(int)} for information about when this deletion will become effective. @return the number of documents deleted @throws StaleReaderException if the index has changedsince this reader was opened @throws CorruptIndexException if the index is corrupt @throws LockObtainFailedException if another writerhas this index open (write.lock could not be obtained) @throws IOException if there is a low-level IO error

        // loop over all documents in deleteQueue
        for (int i = 0; i < deleteCopy.size(); i++) {
          String resourceUrl = deleteCopy.get(i).get(OlatDocument.RESOURCEURL_FIELD_NAME);
          Term term = new Term(OlatDocument.RESOURCEURL_FIELD_NAME, resourceUrl );
          log.info("deleteQueue:delete documents with resourceUrl='" + resourceUrl + "'");
          indexReader.deleteDocuments(term);
          
        }
        log.info("after delete: indexReader.numDocs()=" + indexReader.numDocs());
        // 3. Close reader
        indexReader.close();

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        //--------------------------------------------------------------------


        // deleting the document just added, this will cause a different exception to take place
        Term term = new Term("id", "doc1");
        IndexReader readerB = IndexReader.open(indexStoreB, false);
        readerB.deleteDocuments(term);
        readerB.close();


        // optimizing the index with the writer
        writerB = new IndexWriter(indexStoreB, new StandardAnalyzer(org.apache.lucene.util.Version.LUCENE_CURRENT), false, IndexWriter.MaxFieldLength.LIMITED);
        writerB.optimize();

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    // remove deleted documents
    IndexReader indexDeleter = index.indexReaderFactory();
    if (unflushedDeletions.size() > 0) {
      for (Term term : unflushedDeletions) {
        indexDeleter.deleteDocuments(term);
      }
      unflushedDeletions.clear();
    }

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      document.add(new Field("field", "a sample", Field.Store.YES, Field.Index.TOKENIZED));
      document.add(new Field("filter", "a sample filter", Field.Store.YES, Field.Index.TOKENIZED));
      document.add(new Field("sort", "2", Field.Store.YES, Field.Index.UN_TOKENIZED));
      writer.addDocument(document);


      reader.deleteDocuments(new Term("field", "sample"));
    
      fail();
    } catch(IOException ex) {}
  }

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      document.add(new Field("filter", "a sample filter", Field.Store.YES, Field.Index.TOKENIZED));
      document.add(new Field("sort", "2", Field.Store.YES, Field.Index.UN_TOKENIZED));
      writer.addDocument(document);
      writer.close();


      reader.deleteDocuments(new Term("field", "sample"));
      reader.close();
    
      fail();
    } catch(IOException ex) {}
  }

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    document.add(new Field("sort", "2", Field.Store.YES, Field.Index.UN_TOKENIZED));
    writer.addDocument(document);
    writer.close();


    IndexReader reader = IndexReader.open(directory);
    reader.deleteDocuments(new Term("field", "sample"));
    reader.close();
  }


  public void testAddOptimizeDocument() throws Exception {
    IndexWriter writer = new IndexWriter(directory, new SimpleAnalyzer(), false);

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  public void testDeleteOptimizeDocumentError1() throws Exception {
    try {
      IndexWriter writer = new IndexWriter(directory, new SimpleAnalyzer(), false);
      IndexReader reader = IndexReader.open(directory);
      reader.deleteDocuments(new Term("field", "sample"));
      writer.optimize();
      
      fail();
    } catch (Exception ex) { }
  }

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  public void testDeleteOptimizeDocumentError2() throws Exception {
    try {
      IndexWriter writer = new IndexWriter(directory, new SimpleAnalyzer(), false);
      IndexReader reader = IndexReader.open(directory);
      reader.deleteDocuments(new Term("field", "sample"));
      reader.close();
      writer.optimize();
      writer.close();
      
      fail();

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    } catch (Exception ex) { }
  }


  public void testDeleteOptimizeDocumentSucess() throws Exception {
    IndexReader reader = IndexReader.open(directory);
    reader.deleteDocuments(new Term("field", "sample"));
    reader.close();


    IndexWriter writer = new IndexWriter(directory, new SimpleAnalyzer(), false);
    writer.optimize();
    writer.close();

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    // remove deleted documents
    IndexReader indexDeleter = index.indexReaderFactory();
    if (unflushedDeletions.size() > 0) {
      for (Term term : unflushedDeletions) {
        indexDeleter.deleteDocuments(term);
      }
      unflushedDeletions.clear();
    }

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