add positions version of TestBagOfPostings

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1395770 13f79535-47bb-0310-9956-ffa450edef68

lucene/core/src/test/org/apache/lucene/index/TestBagOfPositions.java

@@ -0,0 +1,144 @@
+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 java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.Random;
+import java.util.concurrent.ConcurrentLinkedQueue;
+import java.util.concurrent.CountDownLatch;
+
+import org.apache.lucene.document.Document;
+import org.apache.lucene.document.Field;
+import org.apache.lucene.document.FieldType;
+import org.apache.lucene.index.FieldInfo.IndexOptions;
+import org.apache.lucene.store.Directory;
+import org.apache.lucene.util.BytesRef;
+import org.apache.lucene.util.LuceneTestCase.SuppressCodecs;
+import org.apache.lucene.util.LuceneTestCase;
+import org.apache.lucene.util._TestUtil;
+
+/**
+ * Simple test that adds numeric terms, where each term has the 
+ * totalTermFreq of its integer value, and checks that the totalTermFreq is correct. 
+ */
+// TODO: somehow factor this with BagOfPostings? its almost the same
+@SuppressCodecs({"Direct", "Memory"}) // at night this makes like 200k/300k docs and will make Direct's heart beat!
+public class TestBagOfPositions extends LuceneTestCase {
+  public void test() throws Exception {
+    List<String> postingsList = new ArrayList<String>();
+    int numTerms = atLeast(300);
+    final int maxTermsPerDoc = _TestUtil.nextInt(random(), 10, 20);
+    if (VERBOSE) {
+      System.out.println("maxTermsPerDoc=" + maxTermsPerDoc);
+      System.out.println("numTerms=" + numTerms);
+    }
+    for (int i = 0; i < numTerms; i++) {
+      String term = Integer.toString(i);
+      for (int j = 0; j < i; j++) {
+        postingsList.add(term);
+      }
+    }
+    Collections.shuffle(postingsList, random());
+
+    final ConcurrentLinkedQueue<String> postings = new ConcurrentLinkedQueue<String>(postingsList);
+
+    Directory dir = newFSDirectory(_TestUtil.getTempDir("bagofpositions"));
+    final RandomIndexWriter iw = new RandomIndexWriter(random(), dir);
+
+    int threadCount = _TestUtil.nextInt(random(), 1, 5);
+    if (VERBOSE) {
+      System.out.println("config: " + iw.w.getConfig());
+      System.out.println("threadCount=" + threadCount);
+    }
+    
+    Field prototype = newTextField("field", "", Field.Store.NO);
+    FieldType fieldType = new FieldType(prototype.fieldType());
+    if (random().nextBoolean()) {
+      fieldType.setOmitNorms(true);
+    }
+    int options = random().nextInt(3);
+    if (options == 0) {
+      fieldType.setIndexOptions(IndexOptions.DOCS_AND_FREQS); // we dont actually need positions
+      fieldType.setStoreTermVectors(true); // but enforce term vectors when we do this so we check SOMETHING
+    } else if (options == 1 && !doesntSupportOffsets.contains(_TestUtil.getPostingsFormat("field"))) {
+      fieldType.setIndexOptions(IndexOptions.DOCS_AND_FREQS_AND_POSITIONS_AND_OFFSETS);
+    }
+    // else just positions
+
+    Thread[] threads = new Thread[threadCount];
+    final CountDownLatch startingGun = new CountDownLatch(1);
+
+    for(int threadID=0;threadID<threadCount;threadID++) {
+      final Random threadRandom = new Random(random().nextLong());
+      final Document document = new Document();
+      final Field field = new Field("field", "", fieldType);
+      document.add(field);
+      threads[threadID] = new Thread() {
+          @Override
+          public void run() {
+            try {
+              startingGun.await();
+              while (!postings.isEmpty()) {
+                StringBuilder text = new StringBuilder();
+                int numTerms = threadRandom.nextInt(maxTermsPerDoc);
+                for (int i = 0; i < numTerms; i++) {
+                  String token = postings.poll();
+                  if (token == null) {
+                    break;
+                  }
+                  text.append(' ');
+                  text.append(token);
+                }
+                field.setStringValue(text.toString());
+                iw.addDocument(document);
+              }
+            } catch (Exception e) {
+              throw new RuntimeException(e);
+            }
+          }
+        };
+      threads[threadID].start();
+    }
+    startingGun.countDown();
+    for(Thread t : threads) {
+      t.join();
+    }
+    
+    iw.forceMerge(1);
+    DirectoryReader ir = iw.getReader();
+    assertEquals(1, ir.leaves().size());
+    AtomicReader air = ir.leaves().get(0).reader();
+    Terms terms = air.terms("field");
+    // numTerms-1 because there cannot be a term 0 with 0 postings:
+    assertEquals(numTerms-1, terms.size());
+    TermsEnum termsEnum = terms.iterator(null);
+    BytesRef term;
+    while ((term = termsEnum.next()) != null) {
+      int value = Integer.parseInt(term.utf8ToString());
+      assertEquals(value, termsEnum.totalTermFreq());
+      // don't really need to check more than this, as CheckIndex
+      // will verify that totalTermFreq == total number of positions seen
+      // from a docsAndPositionsEnum.
+    }
+    ir.close();
+    iw.close();
+    dir.close();
+  }
+}