package org.ovirt.engine.ui.uicompat.external;
/*
* 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.
*/
import java.math.BigDecimal;
import java.util.Iterator;
public class StringUtils {
/**
* <p>
* Checks if a String is empty ("") or null.
* </p>
*
* <pre>
* StringUtils.isEmpty(null) = true
* StringUtils.isEmpty("") = true
* StringUtils.isEmpty(" ") = false
* StringUtils.isEmpty("bob") = false
* StringUtils.isEmpty(" bob ") = false
* </pre>
*
* <p>
* NOTE: This method changed in Lang version 2.0. It no longer trims the String. That functionality is available in
* isBlank().
* </p>
*
* @param str
* the String to check, may be null
* @return <code>true</code> if the String is empty or null
*/
public static boolean isEmpty(String str) {
return str == null || str.length() == 0;
}
/**
* <p>
* Checks if a String is not empty ("") and not null.
* </p>
*
* <pre>
* StringUtils.isNotEmpty(null) = false
* StringUtils.isNotEmpty("") = false
* StringUtils.isNotEmpty(" ") = true
* StringUtils.isNotEmpty("bob") = true
* StringUtils.isNotEmpty(" bob ") = true
* </pre>
*
* @param str
* the String to check, may be null
* @return <code>true</code> if the String is not empty and not null
*/
public static boolean isNotEmpty(String str) {
return !StringUtils.isEmpty(str);
}
/**
* Joins the Strings of the provided array into a single String.
*
* @param array the array of Strings to join together
* @param delimiter the separator string to use
*/
public static String join(Iterable<String> list, String delimiter) {
if (list == null) {
return "";
}
StringBuilder builder = new StringBuilder();
Iterator<String> iter = list.iterator();
while (iter.hasNext()) {
builder.append(iter.next());
if (!iter.hasNext()) {
break;
}
builder.append(delimiter);
}
return builder.toString();
}
/**
* Returns the String form of an object.
*
* @param obj
* The object to turn into a String.
* @return null if the object is null, obj.toString() otherwise.
*/
public static String render(Object obj) {
return obj == null ? null : obj.toString();
}
/**
* Returns the equivalent BigDecimal representation of a String, if possible.
*
* @param str
* The String to try to parse.
* @return null if the String is null or empty, its BigDecimal value otherwise.
* @throws NumberFormatException
* if the String cannot be parsed as an BigDecimal.
*/
public static BigDecimal parseBigDecimal(String str) {
return str == null || str.isEmpty() ? null : new BigDecimal(str);
}
/**
* Returns the equivalent Integer representation of a String, if possible.
*
* @param str
* The String to try to parse.
* @return null if the String is null or empty, its Integer value otherwise.
* @throws NumberFormatException
* if the String cannot be parsed as an Integer.
*/
public static Integer parseInteger(String str) {
return str == null || str.isEmpty() ? null : Integer.parseInt(str);
}
}