com.groupbyinc.common.apache.commons.text.lookup.DateStringLookup Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache license, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the license for the specific language governing permissions and
* limitations under the license.
*/
package org.apache.commons.text.lookup;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import org.apache.commons.lang3.time.FastDateFormat;
/**
* Formats the current date with the format given in the key in a format compatible with
* {@link java.text.SimpleDateFormat}.
*/
final class DateStringLookup extends AbstractStringLookup {
/**
* Defines the singleton for this class.
*/
static final DateStringLookup INSTANCE = new DateStringLookup();
/**
* No need to build instances for now.
*/
private DateStringLookup() {
// empty
}
/**
* Formats the given {@code date} long with the given {@code format}.
*
* @param date
* the date to format
* @param format
* the format string for {@link SimpleDateFormat}.
* @return the formatted date
*/
private String formatDate(final long date, final String format) {
FastDateFormat dateFormat = null;
if (format != null) {
try {
dateFormat = FastDateFormat.getInstance(format);
} catch (final Exception ex) {
throw IllegalArgumentExceptions.format(ex, "Invalid date format: [%s]", format);
}
}
if (dateFormat == null) {
dateFormat = FastDateFormat.getInstance();
}
return dateFormat.format(new Date(date));
}
/**
* Formats the current date with the format given in the key in a format compatible with
* {@link java.text.SimpleDateFormat}.
*
* @param key
* the format to use. If null, the default {@link DateFormat} will be used.
* @return The value of the environment variable.
*/
@Override
public String lookup(final String key) {
return formatDate(System.currentTimeMillis(), key);
}
}