| /** |
| * 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.oozie.util; |
| |
| import java.text.SimpleDateFormat; |
| import java.util.TimeZone; |
| import java.util.Date; |
| import java.net.URLEncoder; |
| import java.io.UnsupportedEncodingException; |
| |
| /** |
| * Base EL constants and functions. |
| */ |
| public class ELConstantsFunctions { |
| |
| /** |
| * KiloByte constant (1024). Defined for EL as 'KB'. |
| */ |
| public static final long KB = 1024; |
| |
| /** |
| * MegaByte constant (1024 KB). Defined for EL as 'MB'. |
| */ |
| public static final long MB = KB * 1024; |
| |
| /** |
| * GigaByte constant (1024 MB). Defined for EL as 'GB'. |
| */ |
| public static final long GB = MB * 1024; |
| |
| /** |
| * TeraByte constant (1024 GB). Defined for EL as 'TB'. |
| */ |
| public static final long TB = GB * 1024; |
| |
| /** |
| * PetaByte constant (1024 TB). Defined for EL as 'PB'. |
| */ |
| public static final long PB = TB * 1024; |
| |
| public static final int SUBMIT_MINUTES = 1; |
| public static final int SUBMIT_HOURS = 60; |
| public static final int SUBMIT_DAYS = 24 * 60; |
| |
| /** |
| * Return the first not <code>null</code> value, or <code>null</code> if both are <code>null</code>. Defined for EL |
| * as 'Object firstNotNull(Object, Object)'. |
| * |
| * @param o1 first value. |
| * @param o2 second value. |
| * @return the first not <code>null</code> value, or or <code>null</code> if both are <code>null</code> |
| */ |
| public static Object firstNotNull(Object o1, Object o2) { |
| return (o1 != null) ? o1 : o2; |
| } |
| |
| /** |
| * Return the concatenation of 2 strings. <p/> A string with <code>null</code> value is considered as an empty |
| * string. |
| * |
| * @param s1 first string. |
| * @param s2 second string. |
| * @return the concatenation of <code>s1</code> and <code>s2</code>. |
| */ |
| public static String concat(String s1, String s2) { |
| StringBuilder sb = new StringBuilder(); |
| if (s1 != null) { |
| sb.append(s1); |
| } |
| if (s2 != null) { |
| sb.append(s2); |
| } |
| return sb.toString(); |
| } |
| |
| /** |
| * Return the trimmed version of the given string. |
| * |
| * @param input string to be trimmed |
| * @return the trimmed version of the given string or the empty string if the given string was <code>null</code> |
| */ |
| public static String trim(String input) { |
| return (input == null) ? "" : input.trim(); |
| } |
| |
| /** |
| * Return the UTC current date and time in W3C format down to second (yyyy-MM-ddTHH:mm:ssZ). i.e.: |
| * 1997-07-16T19:20:30Z |
| * |
| * @return the formatted time string. |
| */ |
| public static String timestamp() { |
| SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'"); |
| sdf.setTimeZone(TimeZone.getTimeZone("UTC")); |
| return sdf.format(new Date()); |
| } |
| |
| /** |
| * Translates a string into <code>application/x-www-form-urlencoded</code> format using UTF-8 encoding scheme. Bytes |
| * for unsafe characters are also obtained using UTF-8 scheme. |
| * |
| * @param input string to be encoded |
| * @return the encoded <code>String</code> |
| */ |
| public static String urlEncode(String input) { |
| try { |
| return (input == null) ? "" : URLEncoder.encode(input, "UTF-8"); |
| } |
| catch (UnsupportedEncodingException uee) { |
| throw new RuntimeException("It should never happen"); |
| } |
| } |
| |
| } |