1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18 package org.apache.commons.numbers.combinatorics;
19
20 /**
21 * @deprecated Since 1.1 this functionality has been replaced with {@link Factorial#doubleValue(int)}.
22 *
23 * <a href="http://mathworld.wolfram.com/Factorial.html">Factorial of a number</a>.
24 */
25 @Deprecated
26 public final class FactorialDouble {
27 /** Single instance. */
28 private static final FactorialDouble INSTANCE = new FactorialDouble();
29
30 /** No public instances. */
31 private FactorialDouble() {}
32
33 /**
34 * @deprecated Since 1.1 this functionality has been replaced with {@link Factorial#doubleValue(int)}.
35 *
36 * <p>This class no longer supports a cache. This method returns a reference to a single instance.
37 *
38 * @return instance
39 */
40 @Deprecated
41 public static FactorialDouble create() {
42 return INSTANCE;
43 }
44
45 /**
46 * @deprecated Since 1.1 this functionality has been replaced with {@link Factorial#doubleValue(int)}.
47 *
48 * <p>This class no longer supports a cache. This method returns a reference to the same object.
49 *
50 * @param cacheSize Ignored.
51 * @return instance
52 */
53 @Deprecated
54 public FactorialDouble withCache(final int cacheSize) {
55 return this;
56 }
57
58 /**
59 * @deprecated Since 1.1 this functionality has been replaced with {@link Factorial#doubleValue(int)}.
60 *
61 * <p>The result of calling this method is the same as calling the {@link Factorial#doubleValue(int)}.
62 *
63 * @param n Argument.
64 * @return {@code n!}
65 * @throws IllegalArgumentException if {@code n < 0}.
66 */
67 @Deprecated
68 public double value(int n) {
69 return Factorial.doubleValue(n);
70 }
71 }