| /** |
| * Copyright 2009 The Apache Software Foundation |
| * |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 org.apache.hadoop.hbase.io; |
| |
| import junit.framework.TestCase; |
| |
| import org.apache.hadoop.hbase.util.Bytes; |
| import java.io.ByteArrayOutputStream; |
| import java.io.DataOutputStream; |
| import java.io.IOException; |
| |
| public class TestImmutableBytesWritable extends TestCase { |
| public void testHash() throws Exception { |
| assertEquals( |
| new ImmutableBytesWritable(Bytes.toBytes("xxabc"), 2, 3).hashCode(), |
| new ImmutableBytesWritable(Bytes.toBytes("abc")).hashCode()); |
| assertEquals( |
| new ImmutableBytesWritable(Bytes.toBytes("xxabcd"), 2, 3).hashCode(), |
| new ImmutableBytesWritable(Bytes.toBytes("abc")).hashCode()); |
| assertNotSame( |
| new ImmutableBytesWritable(Bytes.toBytes("xxabc"), 2, 3).hashCode(), |
| new ImmutableBytesWritable(Bytes.toBytes("xxabc"), 2, 2).hashCode()); |
| } |
| |
| public void testSpecificCompare() { |
| ImmutableBytesWritable ibw1 = new ImmutableBytesWritable(new byte[]{0x0f}); |
| ImmutableBytesWritable ibw2 = new ImmutableBytesWritable(new byte[]{0x00, 0x00}); |
| ImmutableBytesWritable.Comparator c = new ImmutableBytesWritable.Comparator(); |
| assertFalse("ibw1 < ibw2", c.compare( ibw1, ibw2 ) < 0 ); |
| } |
| |
| public void testComparison() throws Exception { |
| runTests("aa", "b", -1); |
| runTests("aa", "aa", 0); |
| runTests("aa", "ab", -1); |
| runTests("aa", "aaa", -1); |
| runTests("", "", 0); |
| runTests("", "a", -1); |
| } |
| |
| private void runTests(String aStr, String bStr, int signum) |
| throws Exception { |
| ImmutableBytesWritable a = new ImmutableBytesWritable( |
| Bytes.toBytes(aStr)); |
| ImmutableBytesWritable b = new ImmutableBytesWritable( |
| Bytes.toBytes(bStr)); |
| |
| doComparisonsOnObjects(a, b, signum); |
| doComparisonsOnRaw(a, b, signum); |
| |
| // Tests for when the offset is non-zero |
| a = new ImmutableBytesWritable(Bytes.toBytes("xxx" + aStr), |
| 3, aStr.length()); |
| b = new ImmutableBytesWritable(Bytes.toBytes("yy" + bStr), |
| 2, bStr.length()); |
| doComparisonsOnObjects(a, b, signum); |
| doComparisonsOnRaw(a, b, signum); |
| |
| // Tests for when offset is nonzero and length doesn't extend to end |
| a = new ImmutableBytesWritable(Bytes.toBytes("xxx" + aStr + "zzz"), |
| 3, aStr.length()); |
| b = new ImmutableBytesWritable(Bytes.toBytes("yy" + bStr + "aaa"), |
| 2, bStr.length()); |
| doComparisonsOnObjects(a, b, signum); |
| doComparisonsOnRaw(a, b, signum); |
| } |
| |
| |
| private int signum(int i) { |
| if (i > 0) return 1; |
| if (i == 0) return 0; |
| return -1; |
| } |
| |
| private void doComparisonsOnRaw(ImmutableBytesWritable a, |
| ImmutableBytesWritable b, |
| int expectedSignum) |
| throws IOException { |
| ImmutableBytesWritable.Comparator comparator = |
| new ImmutableBytesWritable.Comparator(); |
| |
| ByteArrayOutputStream baosA = new ByteArrayOutputStream(); |
| ByteArrayOutputStream baosB = new ByteArrayOutputStream(); |
| |
| a.write(new DataOutputStream(baosA)); |
| b.write(new DataOutputStream(baosB)); |
| |
| assertEquals( |
| "Comparing " + a + " and " + b + " as raw", |
| signum(comparator.compare(baosA.toByteArray(), 0, baosA.size(), |
| baosB.toByteArray(), 0, baosB.size())), |
| expectedSignum); |
| |
| assertEquals( |
| "Comparing " + a + " and " + b + " as raw (inverse)", |
| -signum(comparator.compare(baosB.toByteArray(), 0, baosB.size(), |
| baosA.toByteArray(), 0, baosA.size())), |
| expectedSignum); |
| } |
| |
| private void doComparisonsOnObjects(ImmutableBytesWritable a, |
| ImmutableBytesWritable b, |
| int expectedSignum) { |
| ImmutableBytesWritable.Comparator comparator = |
| new ImmutableBytesWritable.Comparator(); |
| assertEquals( |
| "Comparing " + a + " and " + b + " as objects", |
| signum(comparator.compare(a, b)), expectedSignum); |
| assertEquals( |
| "Comparing " + a + " and " + b + " as objects (inverse)", |
| -signum(comparator.compare(b, a)), expectedSignum); |
| } |
| } |