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comparison graal/com.oracle.jvmci.meta/src/com/oracle/jvmci/meta/AbstractProfiledItem.java @ 21556:48c1ebd24120

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renamed com.oracle.graal.api[meta|code] modules to com.oracle.jvmci.[meta|code] (JBS:GRAAL-53)
author Doug Simon <doug.simon@oracle.com>
date Wed, 27 May 2015 00:36:16 +0200
parents graal/com.oracle.graal.api.meta/src/com/oracle/graal/api/meta/AbstractProfiledItem.java@082417ac43e4
children
comparison
equal deleted inserted replaced
21555:d12eaef9af72 21556:48c1ebd24120
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 com.oracle.jvmci.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 &ge; 0.0 and &le; 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 }