ml.shifu.guagua.util.StringUtils Maven / Gradle / Ivy
/**
* Copyright [2013-2014] eBay Software Foundation
*
* 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 ml.shifu.guagua.util;
/**
* StringUtils class for string operation.
*/
public final class StringUtils {
/** Do not instantiate. */
private StringUtils() {
}
/**
* Return string object. If empty return null..
*/
public static String get(String str) {
return get(str, false, null);
}
/**
* Return string object. If {@code requireNotEmpty} is true with empty or null {@code str}, an
* IllegalArgumentException will be thrown. Else return default string as null or original string.
*/
public static String get(String str, boolean requireNotEmpty) {
return get(str, requireNotEmpty, null);
}
/**
* Return string object. Return default string if empty or null.
*/
public static String get(String str, String defaultStr) {
return get(str, false, defaultStr);
}
/**
* Return string object. If {@code requireNotEmpty} is true with null {@code str}, an IllegalArgumentException will
* be thrown. Else return default string or original string.
*/
public static String get(String str, boolean requireNotEmpty, String defaultStr) {
if(str == null || str.length() == 0) {
if(requireNotEmpty) {
throw new IllegalArgumentException("String should not be empty.");
}
return defaultStr;
}
return str;
}
}