| /* |
| * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| package jdk.vm.ci.meta; |
| |
| /** |
| * A profiled type that has a probability. Profiled types are naturally sorted in descending order |
| * of their probabilities. |
| */ |
| public abstract class AbstractProfiledItem<T> implements Comparable<AbstractProfiledItem<?>> { |
| |
| protected final T item; |
| protected final double probability; |
| |
| public AbstractProfiledItem(T item, double probability) { |
| assert item != null; |
| assert probability >= 0.0D && probability <= 1.0D; |
| this.item = item; |
| this.probability = probability; |
| } |
| |
| protected T getItem() { |
| return item; |
| } |
| |
| /** |
| * Returns the estimated probability of {@link #getItem()}. |
| * |
| * @return double value ≥ 0.0 and ≤ 1.0 |
| */ |
| public double getProbability() { |
| return probability; |
| } |
| |
| /** |
| * Returns -1 if the {@linkplain #getProbability() probability} of this item is greater than |
| * {@code o}'s probability, 0 if there are equal otherwise 1. |
| */ |
| @Override |
| public int compareTo(AbstractProfiledItem<?> o) { |
| // Need to swap the order of operands so that higher probabilities are sorted first |
| return Double.compare(o.getProbability(), getProbability()); |
| } |
| |
| @Override |
| public int hashCode() { |
| final int prime = 31; |
| int result = 1; |
| long temp; |
| temp = Double.doubleToLongBits(probability); |
| result = prime * result + (int) (temp ^ (temp >>> 32)); |
| result = prime * result + item.hashCode(); |
| return result; |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (this == obj) { |
| return true; |
| } |
| if (obj == null) { |
| return false; |
| } |
| if (getClass() != obj.getClass()) { |
| return false; |
| } |
| AbstractProfiledItem<?> other = (AbstractProfiledItem<?>) obj; |
| if (Double.doubleToLongBits(probability) != Double.doubleToLongBits(other.probability)) { |
| return false; |
| } |
| return item.equals(other.item); |
| } |
| |
| @Override |
| public abstract String toString(); |
| } |