--- /dev/null
+package org.apache.lucene.index;
+
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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.util.LuceneTestCase;
+import junit.framework.TestSuite;
+import junit.textui.TestRunner;
+
+import org.apache.lucene.analysis.MockAnalyzer;
+import org.apache.lucene.store.Directory;
+import org.apache.lucene.document.Document;
+import org.apache.lucene.document.Field;
+
+import java.io.IOException;
+
+public class TestFilterIndexReader extends LuceneTestCase {
+
+ private static class TestReader extends FilterIndexReader {
+
+ /** Filter that only permits terms containing 'e'.*/
+ private static class TestTermEnum extends FilterTermEnum {
+ public TestTermEnum(TermEnum termEnum) {
+ super(termEnum);
+ }
+
+ /** Scan for terms containing the letter 'e'.*/
+ @Override
+ public boolean next() throws IOException {
+ while (in.next()) {
+ if (in.term().text().indexOf('e') != -1)
+ return true;
+ }
+ return false;
+ }
+ }
+
+ /** Filter that only returns odd numbered documents. */
+ private static class TestTermPositions extends FilterTermPositions {
+ public TestTermPositions(TermPositions in) {
+ super(in);
+ }
+
+ /** Scan for odd numbered documents. */
+ @Override
+ public boolean next() throws IOException {
+ while (in.next()) {
+ if ((in.doc() % 2) == 1)
+ return true;
+ }
+ return false;
+ }
+ }
+
+ public TestReader(IndexReader reader) {
+ super(reader);
+ }
+
+ /** Filter terms with TestTermEnum. */
+ @Override
+ public TermEnum terms() throws IOException {
+ return new TestTermEnum(in.terms());
+ }
+
+ /** Filter positions with TestTermPositions. */
+ @Override
+ public TermPositions termPositions() throws IOException {
+ return new TestTermPositions(in.termPositions());
+ }
+ }
+
+
+ /** Main for running test case by itself. */
+ public static void main(String args[]) {
+ TestRunner.run (new TestSuite(TestIndexReader.class));
+ }
+
+ /**
+ * Tests the IndexReader.getFieldNames implementation
+ * @throws Exception on error
+ */
+ public void testFilterIndexReader() throws Exception {
+ Directory directory = newDirectory();
+ IndexWriter writer = new IndexWriter(directory, newIndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(random)));
+
+ Document d1 = new Document();
+ d1.add(newField("default","one two", Field.Store.YES, Field.Index.ANALYZED));
+ writer.addDocument(d1);
+
+ Document d2 = new Document();
+ d2.add(newField("default","one three", Field.Store.YES, Field.Index.ANALYZED));
+ writer.addDocument(d2);
+
+ Document d3 = new Document();
+ d3.add(newField("default","two four", Field.Store.YES, Field.Index.ANALYZED));
+ writer.addDocument(d3);
+
+ writer.close();
+
+ IndexReader reader = new TestReader(IndexReader.open(directory, true));
+ TermEnum terms = reader.terms();
+ while (terms.next()) {
+ assertTrue(terms.term().text().indexOf('e') != -1);
+ }
+ terms.close();
+
+ TermPositions positions = reader.termPositions(new Term("default", "one"));
+ while (positions.next()) {
+ assertTrue((positions.doc() % 2) == 1);
+ }
+
+ int NUM_DOCS = 3;
+
+ TermDocs td = reader.termDocs(null);
+ for(int i=0;i<NUM_DOCS;i++) {
+ assertTrue(td.next());
+ assertEquals(i, td.doc());
+ assertEquals(1, td.freq());
+ }
+ td.close();
+ reader.close();
+ directory.close();
+ }
+}