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package org.apache.lucene.search.grouping;
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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import org.apache.lucene.search.Collector;
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import org.apache.lucene.search.Scorer;
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import org.apache.lucene.util.BytesRef;
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import java.io.IOException;
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import java.util.Collection;
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* A collector that collects all groups that match the
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* query. Only the group value is collected, and the order
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* is undefined. This collector does not determine
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* the most relevant document of a group.
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* This is an abstract version. Concrete implementations define
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* what a group actually is and how it is internally collected.
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* @lucene.experimental
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public abstract class AbstractAllGroupsCollector<GROUP_VALUE_TYPE> extends Collector {
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* Returns the total number of groups for the executed search.
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* This is a convenience method. The following code snippet has the same effect: <pre>getGroups().size()</pre>
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* @return The total number of groups for the executed search
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public int getGroupCount() {
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return getGroups().size();
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* Returns the group values
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* This is an unordered collections of group values. For each group that matched the query there is a {@link BytesRef}
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* representing a group value.
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* @return the group values
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public abstract Collection<GROUP_VALUE_TYPE> getGroups();
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// Empty not necessary
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public void setScorer(Scorer scorer) throws IOException {}
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public boolean acceptsDocsOutOfOrder() {
b'\\ No newline at end of file'