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package org.apache.lucene.facet.taxonomy.directory;
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import java.util.HashMap;
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import org.apache.lucene.index.IndexReader;
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import org.apache.lucene.index.IndexWriterConfig.OpenMode;
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import org.apache.lucene.store.AlreadyClosedException;
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import org.apache.lucene.store.Directory;
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import org.junit.Test;
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import org.apache.lucene.util.LuceneTestCase;
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import org.apache.lucene.facet.taxonomy.CategoryPath;
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import org.apache.lucene.facet.taxonomy.directory.DirectoryTaxonomyWriter;
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import org.apache.lucene.facet.taxonomy.writercache.TaxonomyWriterCache;
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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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public class TestDirectoryTaxonomyWriter extends LuceneTestCase {
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// A No-Op TaxonomyWriterCache which always discards all given categories, and
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// always returns true in put(), to indicate some cache entries were cleared.
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private static class NoOpCache implements TaxonomyWriterCache {
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public void close() {}
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public int get(CategoryPath categoryPath) { return -1; }
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public int get(CategoryPath categoryPath, int length) { return get(categoryPath); }
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public boolean put(CategoryPath categoryPath, int ordinal) { return true; }
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public boolean put(CategoryPath categoryPath, int prefixLen, int ordinal) { return true; }
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public boolean hasRoom(int numberOfEntries) { return false; }
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public void testCommit() throws Exception {
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// Verifies that nothing is committed to the underlying Directory, if
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// commit() wasn't called.
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Directory dir = newDirectory();
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DirectoryTaxonomyWriter ltw = new DirectoryTaxonomyWriter(dir, OpenMode.CREATE_OR_APPEND, new NoOpCache());
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assertFalse(IndexReader.indexExists(dir));
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ltw.commit(); // first commit, so that an index will be created
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ltw.addCategory(new CategoryPath("a"));
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IndexReader r = IndexReader.open(dir);
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assertEquals("No categories should have been committed to the underlying directory", 1, r.numDocs());
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public void testCommitUserData() throws Exception {
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// Verifies that committed data is retrievable
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Directory dir = newDirectory();
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DirectoryTaxonomyWriter ltw = new DirectoryTaxonomyWriter(dir, OpenMode.CREATE_OR_APPEND, new NoOpCache());
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assertFalse(IndexReader.indexExists(dir));
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ltw.commit(); // first commit, so that an index will be created
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ltw.addCategory(new CategoryPath("a"));
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ltw.addCategory(new CategoryPath("b"));
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Map <String, String> userCommitData = new HashMap<String, String>();
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userCommitData.put("testing", "1 2 3");
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ltw.commit(userCommitData);
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IndexReader r = IndexReader.open(dir);
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assertEquals("2 categories plus root should have been committed to the underlying directory", 3, r.numDocs());
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Map <String, String> readUserCommitData = r.getCommitUserData();
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assertTrue("wrong value extracted from commit data",
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"1 2 3".equals(readUserCommitData.get("testing")));
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public void testRollback() throws Exception {
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// Verifies that if callback is called, DTW is closed.
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Directory dir = newDirectory();
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DirectoryTaxonomyWriter dtw = new DirectoryTaxonomyWriter(dir);
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dtw.addCategory(new CategoryPath("a"));
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dtw.addCategory(new CategoryPath("a"));
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fail("should not have succeeded to add a category following rollback.");
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} catch (AlreadyClosedException e) {
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public void testEnsureOpen() throws Exception {
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// verifies that an exception is thrown if DTW was closed
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Directory dir = newDirectory();
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DirectoryTaxonomyWriter dtw = new DirectoryTaxonomyWriter(dir);
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dtw.addCategory(new CategoryPath("a"));
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fail("should not have succeeded to add a category following close.");
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} catch (AlreadyClosedException e) {