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 package org.apache.logging.log4j.core.config.plugins.convert;
18
19 import java.lang.invoke.MethodHandle;
20 import java.lang.invoke.MethodHandles;
21 import java.lang.invoke.MethodType;
22 import java.sql.Time;
23 import java.sql.Timestamp;
24 import java.util.Arrays;
25 import java.util.Date;
26 import java.util.Map;
27 import java.util.concurrent.ConcurrentHashMap;
28
29 /**
30 * Utility methods for Date classes.
31 */
32 public final class DateTypeConverter {
33
34 private static final Map<Class<? extends Date>, MethodHandle> CONSTRUCTORS = new ConcurrentHashMap<>();
35
36 static {
37 final MethodHandles.Lookup lookup = MethodHandles.publicLookup();
38 for (final Class<? extends Date> dateClass : Arrays.asList(Date.class, java.sql.Date.class, Time.class,
39 Timestamp.class)) {
40 try {
41 CONSTRUCTORS.put(dateClass,
42 lookup.findConstructor(dateClass, MethodType.methodType(void.class, long.class)));
43 } catch (final NoSuchMethodException | IllegalAccessException ignored) {
44 // these classes all have this exact constructor
45 }
46 }
47 }
48
49 /**
50 * Create a Date-related object from a timestamp in millis.
51 *
52 * @param millis timestamp in millis
53 * @param type date type to use
54 * @param <D> date class to use
55 * @return new instance of D or null if there was an error
56 */
57 @SuppressWarnings("unchecked")
58 public static <D extends Date> D fromMillis(final long millis, final Class<D> type) {
59 try {
60 return (D) CONSTRUCTORS.get(type).invoke(millis);
61 } catch (final Throwable ignored) {
62 return null;
63 }
64 }
65
66 private DateTypeConverter() {
67 }
68 }