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Java example source code file (ChecksumHashFunctionTest.java)
The ChecksumHashFunctionTest.java Java example source code/* * Copyright (C) 2012 The Guava Authors * * Licensed 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. */ package com.google.common.hash; import static com.google.common.hash.Hashing.ChecksumType.ADLER_32; import static com.google.common.hash.Hashing.ChecksumType.CRC_32; import com.google.common.base.Supplier; import junit.framework.TestCase; import java.util.zip.Checksum; /** * Tests for ChecksumHashFunction. * * @author Colin Decker */ public class ChecksumHashFunctionTest extends TestCase { public void testCrc32_equalsChecksumValue() throws Exception { assertChecksum(CRC_32, ""); assertChecksum(CRC_32, "Z"); assertChecksum(CRC_32, "foobar"); } public void testAdler32_equalsChecksumValue() throws Exception { assertChecksum(ADLER_32, ""); assertChecksum(ADLER_32, "Z"); assertChecksum(ADLER_32, "foobar"); } public void testCrc32_knownValues() throws Exception { assertHash32(0x1C8600E3, CRC_32, "hell"); assertHash32(0x3610A686, CRC_32, "hello"); assertHash32(0xED81F9F6, CRC_32, "hello "); assertHash32(0x4850DDC2, CRC_32, "hello w"); assertHash32(0x7A2D6005, CRC_32, "hello wo"); assertHash32(0x1C192672, CRC_32, "hello wor"); assertHash32(0x414FA339, CRC_32, "The quick brown fox jumps over the lazy dog"); assertHash32(0x4400B5BC, CRC_32, "The quick brown fox jumps over the lazy cog"); } public void testAdler32_knownValues() throws Exception { assertHash32(0x041701A6, ADLER_32, "hell"); assertHash32(0x062C0215, ADLER_32, "hello"); assertHash32(0x08610235, ADLER_32, "hello "); assertHash32(0x0B0D02AC, ADLER_32, "hello w"); assertHash32(0x0E28031B, ADLER_32, "hello wo"); assertHash32(0x11B5038D, ADLER_32, "hello wor"); assertHash32(0x5BDC0FDA, ADLER_32, "The quick brown fox jumps over the lazy dog"); assertHash32(0x5BD90FD9, ADLER_32, "The quick brown fox jumps over the lazy cog"); } private static void assertChecksum(Supplier<Checksum> supplier, String input) { byte[] bytes = HashTestUtils.ascii(input); Checksum checksum = supplier.get(); checksum.update(bytes, 0, bytes.length); long value = checksum.getValue(); String toString = "name"; HashFunction func = new ChecksumHashFunction(supplier, 32, toString); assertEquals(toString, func.toString()); assertEquals(value, func.hashBytes(bytes).padToLong()); } private static void assertHash32(int expected, Supplier<Checksum> supplier, String input) { byte[] bytes = HashTestUtils.ascii(input); String toString = "name"; HashFunction func = new ChecksumHashFunction(supplier, 32, toString); assertEquals(expected, func.hashBytes(bytes).asInt()); assertEquals(toString, func.toString()); } } Other Java examples (source code examples)Here is a short list of links related to this Java ChecksumHashFunctionTest.java source code file: |
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