001/* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache license, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the license for the specific language governing permissions and 015 * limitations under the license. 016 */ 017package org.apache.logging.log4j.core.config.plugins.convert; 018 019import java.lang.invoke.MethodHandle; 020import java.lang.invoke.MethodHandles; 021import java.lang.invoke.MethodType; 022import java.sql.Time; 023import java.sql.Timestamp; 024import java.util.Arrays; 025import java.util.Date; 026import java.util.Map; 027import java.util.concurrent.ConcurrentHashMap; 028 029/** 030 * Utility methods for Date classes. 031 */ 032public final class DateTypeConverter { 033 034 private static final Map<Class<? extends Date>, MethodHandle> CONSTRUCTORS = new ConcurrentHashMap<>(); 035 036 static { 037 final MethodHandles.Lookup lookup = MethodHandles.publicLookup(); 038 for (final Class<? extends Date> dateClass : Arrays.asList(Date.class, java.sql.Date.class, Time.class, 039 Timestamp.class)) { 040 try { 041 CONSTRUCTORS.put(dateClass, 042 lookup.findConstructor(dateClass, MethodType.methodType(void.class, long.class))); 043 } catch (final NoSuchMethodException | IllegalAccessException ignored) { 044 // these classes all have this exact constructor 045 } 046 } 047 } 048 049 /** 050 * Create a Date-related object from a timestamp in millis. 051 * 052 * @param millis timestamp in millis 053 * @param type date type to use 054 * @param <D> date class to use 055 * @return new instance of D or null if there was an error 056 */ 057 @SuppressWarnings("unchecked") 058 public static <D extends Date> D fromMillis(final long millis, final Class<D> type) { 059 try { 060 return (D) CONSTRUCTORS.get(type).invoke(millis); 061 } catch (final Throwable ignored) { 062 return null; 063 } 064 } 065 066 private DateTypeConverter() { 067 } 068}