io.github.microcks.util.el.function.NowELFunction Maven / Gradle / Ivy
/*
* Copyright The Microcks Authors.
*
* Licensed 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 io.github.microcks.util.el.function;
import io.github.microcks.util.el.EvaluationContext;
import java.text.SimpleDateFormat;
import java.util.Calendar;
/**
* Implementation of ELFunction that generates a date representation corresponding to current time + an optional amount
* of time. String format and added time unit are specified using Java Date Format patterns.
* @author laurent
*/
public class NowELFunction implements ELFunction {
@Override
public String evaluate(EvaluationContext evaluationContext, String... args) {
SimpleDateFormat dateFormat = null;
if (args != null) {
switch (args.length) {
case 1:
dateFormat = new SimpleDateFormat(args[0]);
return dateFormat.format(Calendar.getInstance().getTime());
case 2:
Calendar now = Calendar.getInstance();
// 2nd argument is a delta with unit.
String unit = args[1].substring(args[1].length() - 1);
String amountStr = args[1].substring(0, args[1].length() - 1);
if (isInteger(amountStr)) {
int amount = Integer.parseInt(amountStr);
switch (unit) {
case "m":
now.add(Calendar.MINUTE, amount);
break;
case "H":
now.add(Calendar.HOUR, amount);
break;
case "d":
now.add(Calendar.DATE, amount);
break;
case "M":
now.add(Calendar.MONTH, amount);
break;
case "y":
now.add(Calendar.YEAR, amount);
break;
default:
break;
}
}
dateFormat = new SimpleDateFormat(args[0]);
return dateFormat.format(now.getTime());
default:
return String.valueOf(System.currentTimeMillis());
}
}
return String.valueOf(System.currentTimeMillis());
}
/** Check if given string is parsable in Integer without throwing exception. */
private static boolean isInteger(String strNum) {
if (strNum == null) {
return false;
}
try {
int d = Integer.parseInt(strNum);
} catch (NumberFormatException nfe) {
return false;
}
return true;
}
}