/*
* Copyright 2017 TWO SIGMA OPEN SOURCE, LLC
*
* 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 com.twosigma.beaker.jupyter;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Collection;
import java.util.Date;
import java.util.TimeZone;
import java.util.UUID;
public class Utils {
/**
* The timezone to use when generating time stamps.
*/
public static final TimeZone UTC = TimeZone.getTimeZone("UTC");
public static final String DATE_FORMAT = "yyyy-MM-dd'T'HH:mmZ";
public static final String EMPTY_STRING = "";
public static String timestamp() {
// SimpleDateFormat is not thread-safe so we need to create a new one for
// each
// timestamp that is generated.
DateFormat df = new SimpleDateFormat(DATE_FORMAT);
df.setTimeZone(UTC);
return df.format(new Date());
}
public static String uuid() {
return UUID.randomUUID().toString();
}
public static String getUsString(String[] input) {
StringBuilder ret = new StringBuilder();
if (input != null && input.length > 0) {
for (String s : input) {
ret.append(s + "\n");
}
}
return ret.toString();
}
public static String getAsString(Collection<String> input) {
if (input == null || input.isEmpty()) {
return EMPTY_STRING;
}
return getUsString(input.toArray(new String[input.size()]));
}
}