1 /* 2 * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 package jdk.vm.ci.meta; 24 25 /** 26 * A profiled type that has a probability. Profiled types are naturally sorted in descending order 27 * of their probabilities. 28 */ 29 public abstract class AbstractProfiledItem<T> implements Comparable<AbstractProfiledItem<?>> { 30 31 protected final T item; 32 protected final double probability; 33 34 public AbstractProfiledItem(T item, double probability) { 35 assert item != null; 36 assert probability >= 0.0D && probability <= 1.0D; 37 this.item = item; 38 this.probability = probability; 39 } 40 41 protected T getItem() { 42 return item; 43 } 44 45 /** 46 * Returns the estimated probability of {@link #getItem()}. 47 * 48 * @return double value ≥ 0.0 and ≤ 1.0 49 */ 50 public double getProbability() { 51 return probability; 52 } 53 54 @Override 55 public int compareTo(AbstractProfiledItem<?> o) { 56 if (getProbability() > o.getProbability()) { 57 return -1; 58 } else if (getProbability() < o.getProbability()) { 59 return 1; 60 } 61 return 0; 62 } 63 64 @Override 65 public int hashCode() { 66 final int prime = 31; 67 int result = 1; 68 long temp; 69 temp = Double.doubleToLongBits(probability); 70 result = prime * result + (int) (temp ^ (temp >>> 32)); 71 result = prime * result + item.hashCode(); 72 return result; 73 } 74 75 @Override 76 public boolean equals(Object obj) { 77 if (this == obj) { 78 return true; 79 } 80 if (obj == null) { 81 return false; 82 } 83 if (getClass() != obj.getClass()) { 84 return false; 85 } 86 AbstractProfiledItem<?> other = (AbstractProfiledItem<?>) obj; 87 if (Double.doubleToLongBits(probability) != Double.doubleToLongBits(other.probability)) { 88 return false; 89 } 90 return item.equals(other.item); 91 } 92 93 @Override 94 public abstract String toString(); 95 }