pylucene 3.5.0-3

[pylucene.git] / lucene-java-3.5.0 / lucene / contrib / grouping / src / java / org / apache / lucene / search / grouping / TermSecondPassGroupingCollector.java

diff --git a/lucene-java-3.5.0/lucene/contrib/grouping/src/java/org/apache/lucene/search/grouping/TermSecondPassGroupingCollector.java b/lucene-java-3.5.0/lucene/contrib/grouping/src/java/org/apache/lucene/search/grouping/TermSecondPassGroupingCollector.java
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+++ b/lucene-java-3.5.0/lucene/contrib/grouping/src/java/org/apache/lucene/search/grouping/TermSecondPassGroupingCollector.java
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+package org.apache.lucene.search.grouping;
+
+/**
+ * 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.io.IOException;
+import java.util.Collection;
+
+import org.apache.lucene.index.IndexReader;
+import org.apache.lucene.search.FieldCache;
+import org.apache.lucene.search.Sort;
+
+/**
+ * Concrete implementation of {@link AbstractSecondPassGroupingCollector} that groups based on
+ * field values and more specifically uses {@link org.apache.lucene.search.FieldCache.StringIndex}
+ * to collect grouped docs.
+ *
+ * @lucene.experimental
+ */
+public class TermSecondPassGroupingCollector extends AbstractSecondPassGroupingCollector<String> {
+
+  private final SentinelIntSet ordSet;
+  private FieldCache.StringIndex index;
+  private final String groupField;
+
+  @SuppressWarnings("unchecked")
+  public TermSecondPassGroupingCollector(String groupField, Collection<SearchGroup<String>> groups, Sort groupSort, Sort withinGroupSort,
+                                         int maxDocsPerGroup, boolean getScores, boolean getMaxScores, boolean fillSortFields)
+      throws IOException {
+    super(groups, groupSort, withinGroupSort, maxDocsPerGroup, getScores, getMaxScores, fillSortFields);
+    ordSet = new SentinelIntSet(groupMap.size(), -1);
+    this.groupField = groupField;
+    groupDocs = (SearchGroupDocs<String>[]) new SearchGroupDocs[ordSet.keys.length];
+  }
+
+  @Override
+  public void setNextReader(IndexReader reader, int docBase) throws IOException {
+    super.setNextReader(reader, docBase);
+    index = FieldCache.DEFAULT.getStringIndex(reader, groupField);
+
+    // Rebuild ordSet
+    ordSet.clear();
+    for (SearchGroupDocs<String> group : groupMap.values()) {
+//      System.out.println("  group=" + (group.groupValue == null ? "null" : group.groupValue.utf8ToString()));
+      int ord = group.groupValue == null ? 0 : index.binarySearchLookup(group.groupValue);
+      if (ord >= 0) {
+        groupDocs[ordSet.put(ord)] = group;
+      }
+    }
+  }
+
+  @Override
+  protected SearchGroupDocs<String> retrieveGroup(int doc) throws IOException {
+    int slot = ordSet.find(index.order[doc]);
+    if (slot >= 0) {
+      return groupDocs[slot];
+    }
+    return null;
+  }
+}
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