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fd1954d74f
CompressedString relied on the assumption that two CompressedString instanes are equal if there compressed representation are equal. Unfortunately this is not always true because the compressed representation also depends on when flush() was called on the output stream or on the size of the hash table that has been used at compression time.
114 lines
4.4 KiB
Java
114 lines
4.4 KiB
Java
/*
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* Licensed to Elasticsearch under one or more contributor
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* license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright
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* ownership. Elasticsearch licenses this file to you under
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* the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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*/
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package org.elasticsearch.common.compress;
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import org.apache.lucene.util.TestUtil;
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import org.elasticsearch.common.bytes.BytesReference;
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import org.elasticsearch.common.io.stream.BytesStreamOutput;
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import org.elasticsearch.common.io.stream.StreamOutput;
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import org.elasticsearch.common.settings.ImmutableSettings;
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import org.elasticsearch.test.ElasticsearchTestCase;
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import org.junit.Assert;
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import org.junit.Test;
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import java.io.IOException;
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import java.util.Random;
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import static org.hamcrest.Matchers.equalTo;
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import static org.hamcrest.Matchers.not;
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/**
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*
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*/
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public class CompressedStringTests extends ElasticsearchTestCase {
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@Test
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public void simpleTestsLZF() throws IOException {
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simpleTests("lzf");
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}
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private void assertEquals(CompressedString s1, CompressedString s2) {
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Assert.assertEquals(s1, s2);
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assertArrayEquals(s1.uncompressed(), s2.uncompressed());
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assertEquals(s1.hashCode(), s2.hashCode());
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}
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public void simpleTests(String compressor) throws IOException {
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CompressorFactory.configure(ImmutableSettings.settingsBuilder().put("compress.default.type", compressor).build());
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String str = "this is a simple string";
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CompressedString cstr = new CompressedString(str);
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assertThat(cstr.string(), equalTo(str));
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assertThat(new CompressedString(str), equalTo(cstr));
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String str2 = "this is a simple string 2";
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CompressedString cstr2 = new CompressedString(str2);
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assertThat(cstr2.string(), not(equalTo(str)));
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assertThat(new CompressedString(str2), not(equalTo(cstr)));
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assertEquals(new CompressedString(str2), cstr2);
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}
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public void testRandom() throws IOException {
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String compressor = "lzf";
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CompressorFactory.configure(ImmutableSettings.settingsBuilder().put("compress.default.type", compressor).build());
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Random r = getRandom();
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for (int i = 0; i < 1000; i++) {
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String string = TestUtil.randomUnicodeString(r, 10000);
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CompressedString compressedString = new CompressedString(string);
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assertThat(compressedString.string(), equalTo(string));
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}
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}
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public void testDifferentCompressedRepresentation() throws Exception {
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byte[] b = "abcdefghijabcdefghij".getBytes("UTF-8");
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CompressorFactory.defaultCompressor();
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Compressor compressor = CompressorFactory.defaultCompressor();
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BytesStreamOutput bout = new BytesStreamOutput();
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StreamOutput out = compressor.streamOutput(bout);
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out.writeBytes(b);
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out.flush();
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out.writeBytes(b);
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out.close();
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final BytesReference b1 = bout.bytes();
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bout = new BytesStreamOutput();
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out = compressor.streamOutput(bout);
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out.writeBytes(b);
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out.writeBytes(b);
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out.close();
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final BytesReference b2 = bout.bytes();
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// because of the intermediate flush, the two compressed representations
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// are different. It can also happen for other reasons like if hash tables
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// of different size are being used
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assertFalse(b1.equals(b2));
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// we used the compressed representation directly and did not recompress
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assertArrayEquals(b1.toBytes(), new CompressedString(b1).compressed());
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assertArrayEquals(b2.toBytes(), new CompressedString(b2).compressed());
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// but compressedstring instances are still equal
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assertEquals(new CompressedString(b1), new CompressedString(b2));
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}
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public void testHashCode() throws IOException {
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assertFalse(new CompressedString("a").hashCode() == new CompressedString("b").hashCode());
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}
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}
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