FileDocCategorySizeDatePackage
TestIndexReader.javaAPI DocApache Lucene 1.4.317864Mon Aug 02 00:55:12 BST 2004org.apache.lucene.index

TestIndexReader

public class TestIndexReader extends TestCase
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.

Fields Summary
Constructors Summary
public TestIndexReader(String name)

        super(name);
Methods Summary
private voidaddDoc(org.apache.lucene.index.IndexWriter writer, java.lang.String value)

        Document doc = new Document();
        doc.add(Field.UnStored("content", value));

        try
        {
            writer.addDocument(doc);
        }
        catch (IOException e)
        {
            e.printStackTrace();
        }
private voidaddDocumentWithDifferentFields(org.apache.lucene.index.IndexWriter writer)

        Document doc = new Document();
        doc.add(Field.Keyword("keyword2","test1"));
        doc.add(Field.Text("text2","test1"));
        doc.add(Field.UnIndexed("unindexed2","test1"));
        doc.add(Field.UnStored("unstored2","test1"));
        writer.addDocument(doc);
private voidaddDocumentWithFields(org.apache.lucene.index.IndexWriter writer)

        Document doc = new Document();
        doc.add(Field.Keyword("keyword","test1"));
        doc.add(Field.Text("text","test1"));
        doc.add(Field.UnIndexed("unindexed","test1"));
        doc.add(Field.UnStored("unstored","test1"));
        writer.addDocument(doc);
private voidassertTermDocsCount(java.lang.String msg, org.apache.lucene.index.IndexReader reader, org.apache.lucene.index.Term term, int expected)

        TermDocs tdocs = null;

        try {
            tdocs = reader.termDocs(term);
            assertNotNull(msg + ", null TermDocs", tdocs);
            int count = 0;
            while(tdocs.next()) {
                count++;
            }
            assertEquals(msg + ", count mismatch", expected, count);

        } finally {
            if (tdocs != null)
                try { tdocs.close(); } catch (Exception e) { }
        }
private voiddeleteReaderReaderConflict(boolean optimize)

        Directory dir = getDirectory(true);

        Term searchTerm1 = new Term("content", "aaa");
        Term searchTerm2 = new Term("content", "bbb");
        Term searchTerm3 = new Term("content", "ccc");

        //  add 100 documents with term : aaa
        //  add 100 documents with term : bbb
        //  add 100 documents with term : ccc
        IndexWriter writer  = new IndexWriter(dir, new WhitespaceAnalyzer(), true);
        for (int i = 0; i < 100; i++)
        {
            addDoc(writer, searchTerm1.text());
            addDoc(writer, searchTerm2.text());
            addDoc(writer, searchTerm3.text());
        }
        if(optimize)
          writer.optimize();
        writer.close();

        // OPEN TWO READERS
        // Both readers get segment info as exists at this time
        IndexReader reader1 = IndexReader.open(dir);
        assertEquals("first opened", 100, reader1.docFreq(searchTerm1));
        assertEquals("first opened", 100, reader1.docFreq(searchTerm2));
        assertEquals("first opened", 100, reader1.docFreq(searchTerm3));
        assertTermDocsCount("first opened", reader1, searchTerm1, 100);
        assertTermDocsCount("first opened", reader1, searchTerm2, 100);
        assertTermDocsCount("first opened", reader1, searchTerm3, 100);

        IndexReader reader2 = IndexReader.open(dir);
        assertEquals("first opened", 100, reader2.docFreq(searchTerm1));
        assertEquals("first opened", 100, reader2.docFreq(searchTerm2));
        assertEquals("first opened", 100, reader2.docFreq(searchTerm3));
        assertTermDocsCount("first opened", reader2, searchTerm1, 100);
        assertTermDocsCount("first opened", reader2, searchTerm2, 100);
        assertTermDocsCount("first opened", reader2, searchTerm3, 100);

        // DELETE DOCS FROM READER 2 and CLOSE IT
        // delete documents containing term: aaa
        // when the reader is closed, the segment info is updated and
        // the first reader is now stale
        reader2.delete(searchTerm1);
        assertEquals("after delete 1", 100, reader2.docFreq(searchTerm1));
        assertEquals("after delete 1", 100, reader2.docFreq(searchTerm2));
        assertEquals("after delete 1", 100, reader2.docFreq(searchTerm3));
        assertTermDocsCount("after delete 1", reader2, searchTerm1, 0);
        assertTermDocsCount("after delete 1", reader2, searchTerm2, 100);
        assertTermDocsCount("after delete 1", reader2, searchTerm3, 100);
        reader2.close();

        // Make sure reader 1 is unchanged since it was open earlier
        assertEquals("after delete 1", 100, reader1.docFreq(searchTerm1));
        assertEquals("after delete 1", 100, reader1.docFreq(searchTerm2));
        assertEquals("after delete 1", 100, reader1.docFreq(searchTerm3));
        assertTermDocsCount("after delete 1", reader1, searchTerm1, 100);
        assertTermDocsCount("after delete 1", reader1, searchTerm2, 100);
        assertTermDocsCount("after delete 1", reader1, searchTerm3, 100);


        // ATTEMPT TO DELETE FROM STALE READER
        // delete documents containing term: bbb
        try {
            reader1.delete(searchTerm2);
            fail("Delete allowed from a stale index reader");
        } catch (IOException e) {
            /* success */
        }

        // RECREATE READER AND TRY AGAIN
        reader1.close();
        reader1 = IndexReader.open(dir);
        assertEquals("reopened", 100, reader1.docFreq(searchTerm1));
        assertEquals("reopened", 100, reader1.docFreq(searchTerm2));
        assertEquals("reopened", 100, reader1.docFreq(searchTerm3));
        assertTermDocsCount("reopened", reader1, searchTerm1, 0);
        assertTermDocsCount("reopened", reader1, searchTerm2, 100);
        assertTermDocsCount("reopened", reader1, searchTerm3, 100);

        reader1.delete(searchTerm2);
        assertEquals("deleted 2", 100, reader1.docFreq(searchTerm1));
        assertEquals("deleted 2", 100, reader1.docFreq(searchTerm2));
        assertEquals("deleted 2", 100, reader1.docFreq(searchTerm3));
        assertTermDocsCount("deleted 2", reader1, searchTerm1, 0);
        assertTermDocsCount("deleted 2", reader1, searchTerm2, 0);
        assertTermDocsCount("deleted 2", reader1, searchTerm3, 100);
        reader1.close();

        // Open another reader to confirm that everything is deleted
        reader2 = IndexReader.open(dir);
        assertEquals("reopened 2", 100, reader2.docFreq(searchTerm1));
        assertEquals("reopened 2", 100, reader2.docFreq(searchTerm2));
        assertEquals("reopened 2", 100, reader2.docFreq(searchTerm3));
        assertTermDocsCount("reopened 2", reader2, searchTerm1, 0);
        assertTermDocsCount("reopened 2", reader2, searchTerm2, 0);
        assertTermDocsCount("reopened 2", reader2, searchTerm3, 100);
        reader2.close();

        dir.close();
private voiddeleteReaderWriterConflict(boolean optimize)

        //Directory dir = new RAMDirectory();
        Directory dir = getDirectory(true);

        Term searchTerm = new Term("content", "aaa");
        Term searchTerm2 = new Term("content", "bbb");

        //  add 100 documents with term : aaa
        IndexWriter writer  = new IndexWriter(dir, new WhitespaceAnalyzer(), true);
        for (int i = 0; i < 100; i++)
        {
            addDoc(writer, searchTerm.text());
        }
        writer.close();

        // OPEN READER AT THIS POINT - this should fix the view of the
        // index at the point of having 100 "aaa" documents and 0 "bbb"
        IndexReader reader = IndexReader.open(dir);
        assertEquals("first docFreq", 100, reader.docFreq(searchTerm));
        assertEquals("first docFreq", 0, reader.docFreq(searchTerm2));
        assertTermDocsCount("first reader", reader, searchTerm, 100);
        assertTermDocsCount("first reader", reader, searchTerm2, 0);

        // add 100 documents with term : bbb
        writer  = new IndexWriter(dir, new WhitespaceAnalyzer(), false);
        for (int i = 0; i < 100; i++)
        {
            addDoc(writer, searchTerm2.text());
        }

        // REQUEST OPTIMIZATION
        // This causes a new segment to become current for all subsequent
        // searchers. Because of this, deletions made via a previously open
        // reader, which would be applied to that reader's segment, are lost
        // for subsequent searchers/readers
        if(optimize)
          writer.optimize();
        writer.close();

        // The reader should not see the new data
        assertEquals("first docFreq", 100, reader.docFreq(searchTerm));
        assertEquals("first docFreq", 0, reader.docFreq(searchTerm2));
        assertTermDocsCount("first reader", reader, searchTerm, 100);
        assertTermDocsCount("first reader", reader, searchTerm2, 0);


        // DELETE DOCUMENTS CONTAINING TERM: aaa
        // NOTE: the reader was created when only "aaa" documents were in
        int deleted = 0;
        try {
            deleted = reader.delete(searchTerm);
            fail("Delete allowed on an index reader with stale segment information");
        } catch (IOException e) {
            /* success */
        }

        // Re-open index reader and try again. This time it should see
        // the new data.
        reader.close();
        reader = IndexReader.open(dir);
        assertEquals("first docFreq", 100, reader.docFreq(searchTerm));
        assertEquals("first docFreq", 100, reader.docFreq(searchTerm2));
        assertTermDocsCount("first reader", reader, searchTerm, 100);
        assertTermDocsCount("first reader", reader, searchTerm2, 100);

        deleted = reader.delete(searchTerm);
        assertEquals("deleted count", 100, deleted);
        assertEquals("deleted docFreq", 100, reader.docFreq(searchTerm));
        assertEquals("deleted docFreq", 100, reader.docFreq(searchTerm2));
        assertTermDocsCount("deleted termDocs", reader, searchTerm, 0);
        assertTermDocsCount("deleted termDocs", reader, searchTerm2, 100);
        reader.close();

        // CREATE A NEW READER and re-test
        reader = IndexReader.open(dir);
        assertEquals("deleted docFreq", 100, reader.docFreq(searchTerm));
        assertEquals("deleted docFreq", 100, reader.docFreq(searchTerm2));
        assertTermDocsCount("deleted termDocs", reader, searchTerm, 0);
        assertTermDocsCount("deleted termDocs", reader, searchTerm2, 100);
        reader.close();
private org.apache.lucene.store.DirectorygetDirectory(boolean create)

    return FSDirectory.getDirectory(new File(System.getProperty("tempDir"), "testIndex"), create);
public static voidmain(java.lang.String[] args)
Main for running test case by itself.

        TestRunner.run (new TestSuite(TestIndexReader.class));
//        TestRunner.run (new TestIndexReader("testBasicDelete"));
//        TestRunner.run (new TestIndexReader("testDeleteReaderWriterConflict"));
//        TestRunner.run (new TestIndexReader("testDeleteReaderReaderConflict"));
//        TestRunner.run (new TestIndexReader("testFilesOpenClose"));
public voidtestBasicDelete()

        Directory dir = new RAMDirectory();

        IndexWriter writer = null;
        IndexReader reader = null;
        Term searchTerm = new Term("content", "aaa");

        //  add 100 documents with term : aaa
        writer  = new IndexWriter(dir, new WhitespaceAnalyzer(), true);
        for (int i = 0; i < 100; i++)
        {
            addDoc(writer, searchTerm.text());
        }
        writer.close();

        // OPEN READER AT THIS POINT - this should fix the view of the
        // index at the point of having 100 "aaa" documents and 0 "bbb"
        reader = IndexReader.open(dir);
        assertEquals("first docFreq", 100, reader.docFreq(searchTerm));
        assertTermDocsCount("first reader", reader, searchTerm, 100);

        // DELETE DOCUMENTS CONTAINING TERM: aaa
        int deleted = 0;
        reader = IndexReader.open(dir);
        deleted = reader.delete(searchTerm);
        assertEquals("deleted count", 100, deleted);
        assertEquals("deleted docFreq", 100, reader.docFreq(searchTerm));
        assertTermDocsCount("deleted termDocs", reader, searchTerm, 0);
        reader.close();

        // CREATE A NEW READER and re-test
        reader = IndexReader.open(dir);
        assertEquals("deleted docFreq", 100, reader.docFreq(searchTerm));
        assertTermDocsCount("deleted termDocs", reader, searchTerm, 0);
        reader.close();
public voidtestDeleteReaderReaderConflictOptimized()

      deleteReaderReaderConflict(true);
public voidtestDeleteReaderReaderConflictUnoptimized()

      deleteReaderReaderConflict(false);
public voidtestDeleteReaderWriterConflictOptimized()

        deleteReaderWriterConflict(true);
public voidtestDeleteReaderWriterConflictUnoptimized()

      deleteReaderWriterConflict(false);
public voidtestFilesOpenClose()

        // Create initial data set
        Directory dir = getDirectory(true);
        IndexWriter writer  = new IndexWriter(dir, new WhitespaceAnalyzer(), true);
        addDoc(writer, "test");
        writer.close();
        dir.close();

        // Try to erase the data - this ensures that the writer closed all files
        dir = getDirectory(true);

        // Now create the data set again, just as before
        writer  = new IndexWriter(dir, new WhitespaceAnalyzer(), true);
        addDoc(writer, "test");
        writer.close();
        dir.close();

        // Now open existing directory and test that reader closes all files
        dir = getDirectory(false);
        IndexReader reader1 = IndexReader.open(dir);
        reader1.close();
        dir.close();

        // The following will fail if reader did not close all files
        dir = getDirectory(true);
public voidtestGetFieldNames()
Tests the IndexReader.getFieldNames implementation

throws
Exception on error

        RAMDirectory d = new RAMDirectory();
        // set up writer
        IndexWriter writer = new IndexWriter(d, new StandardAnalyzer(), true);
        addDocumentWithFields(writer);
        writer.close();
        // set up reader
        IndexReader reader = IndexReader.open(d);
        Collection fieldNames = reader.getFieldNames();
        assertTrue(fieldNames.contains("keyword"));
        assertTrue(fieldNames.contains("text"));
        assertTrue(fieldNames.contains("unindexed"));
        assertTrue(fieldNames.contains("unstored"));
        // add more documents
        writer = new IndexWriter(d, new StandardAnalyzer(), false);
        // want to get some more segments here
        for (int i = 0; i < 5*writer.mergeFactor; i++)
        {
            addDocumentWithFields(writer);
        }
        // new fields are in some different segments (we hope)
        for (int i = 0; i < 5*writer.mergeFactor; i++)
        {
            addDocumentWithDifferentFields(writer);
        }
        writer.close();
        // verify fields again
        reader = IndexReader.open(d);
        fieldNames = reader.getFieldNames();
        assertEquals(9, fieldNames.size());    // the following fields + an empty one (bug?!)
        assertTrue(fieldNames.contains("keyword"));
        assertTrue(fieldNames.contains("text"));
        assertTrue(fieldNames.contains("unindexed"));
        assertTrue(fieldNames.contains("unstored"));
        assertTrue(fieldNames.contains("keyword2"));
        assertTrue(fieldNames.contains("text2"));
        assertTrue(fieldNames.contains("unindexed2"));
        assertTrue(fieldNames.contains("unstored2"));

        // verify that only indexed fields were returned
        Collection indexedFieldNames = reader.getFieldNames(true);
        assertEquals(6, indexedFieldNames.size());
        assertTrue(indexedFieldNames.contains("keyword"));
        assertTrue(indexedFieldNames.contains("text"));
        assertTrue(indexedFieldNames.contains("unstored"));
        assertTrue(indexedFieldNames.contains("keyword2"));
        assertTrue(indexedFieldNames.contains("text2"));
        assertTrue(indexedFieldNames.contains("unstored2"));

        // verify that only unindexed fields were returned
        Collection unindexedFieldNames = reader.getFieldNames(false);
        assertEquals(3, unindexedFieldNames.size());    // the following fields + an empty one
        assertTrue(unindexedFieldNames.contains("unindexed"));
        assertTrue(unindexedFieldNames.contains("unindexed2"));