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package org.apache.lucene.search;
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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 java.io.IOException;
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import org.apache.lucene.index.IndexReader;
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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.LuceneTestCase;
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import org.junit.Test;
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public class MultiCollectorTest extends LuceneTestCase {
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private static class DummyCollector extends Collector {
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boolean acceptsDocsOutOfOrderCalled = false;
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boolean collectCalled = false;
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boolean setNextReaderCalled = false;
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boolean setScorerCalled = false;
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public boolean acceptsDocsOutOfOrder() {
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acceptsDocsOutOfOrderCalled = true;
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public void collect(int doc) throws IOException {
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public void setNextReader(IndexReader reader, int docBase) throws IOException {
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setNextReaderCalled = true;
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public void setScorer(Scorer scorer) throws IOException {
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setScorerCalled = true;
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public void testNullCollectors() throws Exception {
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// Tests that the collector rejects all null collectors.
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MultiCollector.wrap(null, null);
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fail("only null collectors should not be supported");
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} catch (IllegalArgumentException e) {
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// Tests that the collector handles some null collectors well. If it
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// doesn't, an NPE would be thrown.
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Collector c = MultiCollector.wrap(new DummyCollector(), null, new DummyCollector());
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assertTrue(c instanceof MultiCollector);
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assertTrue(c.acceptsDocsOutOfOrder());
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c.setNextReader(null, 0);
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public void testSingleCollector() throws Exception {
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// Tests that if a single Collector is input, it is returned (and not MultiCollector).
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DummyCollector dc = new DummyCollector();
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assertSame(dc, MultiCollector.wrap(dc));
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assertSame(dc, MultiCollector.wrap(dc, null));
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public void testCollector() throws Exception {
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// Tests that the collector delegates calls to input collectors properly.
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// Tests that the collector handles some null collectors well. If it
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// doesn't, an NPE would be thrown.
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DummyCollector[] dcs = new DummyCollector[] { new DummyCollector(), new DummyCollector() };
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Collector c = MultiCollector.wrap(dcs);
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assertTrue(c.acceptsDocsOutOfOrder());
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c.setNextReader(null, 0);
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for (DummyCollector dc : dcs) {
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assertTrue(dc.acceptsDocsOutOfOrderCalled);
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assertTrue(dc.collectCalled);
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assertTrue(dc.setNextReaderCalled);
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assertTrue(dc.setScorerCalled);