/* * 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.eagle.log.entity; import org.apache.eagle.log.entity.meta.DoubleSerDeser; import org.apache.eagle.common.ByteUtil; import org.junit.Assert; import org.apache.hadoop.hbase.filter.BinaryComparator; import org.junit.Test; public class TestDoubleSerDeser { @Test public void test() { DoubleSerDeser dsd = new DoubleSerDeser(); // byte[] t = {'N', 'a', 'N'}; byte[] t = dsd.serialize(Double.NaN); Double d = dsd.deserialize(t); System.out.println(d); // Double d = dsd.deserialize(t); } /** * @link http://en.wikipedia.org/wiki/Double-precision_floating-point_format */ @Test public void testIEEE754_Binary64_DoublePrecisionFloatingPointFormat() { for (Double last = null, i = Math.pow(-2.0, 33); i < Math.pow(2.0, 33); i += Math.pow(2.0, 10)) { if (last != null) { Assert.assertTrue(i > last); if (last < 0 && i < 0) { Assert .assertTrue("Negative double value and its serialization Binary array have negative correlation", new BinaryComparator(ByteUtil.doubleToBytes(i)) .compareTo(ByteUtil.doubleToBytes(last)) < 0); } else if (last < 0 && i >= 0) { Assert .assertTrue("Binary array for negative double is always greater than any positive doubles' ", new BinaryComparator(ByteUtil.doubleToBytes(i)) .compareTo(ByteUtil.doubleToBytes(last)) < 0); } else if (last >= 0) { Assert .assertTrue("Positive double value and its serialization Binary array have positive correlation", new BinaryComparator(ByteUtil.doubleToBytes(i)) .compareTo(ByteUtil.doubleToBytes(last)) > 0); } } last = i; } Assert.assertTrue("Binary array for negative double is always greater than any positive doubles'", new BinaryComparator(ByteUtil.doubleToBytes(-1.0)) .compareTo(ByteUtil.doubleToBytes(Math.pow(2.0, 32))) > 0); } }