001/*
002 *  Licensed to the Apache Software Foundation (ASF) under one
003 *  or more contributor license agreements.  See the NOTICE file
004 *  distributed with this work for additional information
005 *  regarding copyright ownership.  The ASF licenses this file
006 *  to you under the Apache License, Version 2.0 (the
007 *  "License"); you may not use this file except in compliance
008 *  with the License.  You may obtain a copy of the License at
009 *
010 *        http://www.apache.org/licenses/LICENSE-2.0
011 *
012 *  Unless required by applicable law or agreed to in writing,
013 *  software distributed under the License is distributed on an
014 *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 *  KIND, either express or implied.  See the License for the
016 *  specific language governing permissions and limitations
017 *  under the License.
018 */
019
020package org.apache.isis.core.commons.lang;
021
022import com.google.common.base.Function;
023
024public final class StringFunctions {
025    
026    public static final Function<String,String> TRIM = new Function<String,String>(){
027        @Override
028        public String apply(String input) {
029            return input==null?"":input.trim();
030        }
031    };
032
033    private StringFunctions() {
034    }
035
036    public static Function<String, String> toLowerCase() {
037        return new Function<String, String>() {
038            @Override
039            public String apply(String input) {
040                return input != null? input.toLowerCase(): null;
041            }
042        };
043    }
044    
045    public static Function<String, String> toUpperCase() {
046        return new Function<String, String>() {
047            @Override
048            public String apply(String input) {
049                return input != null? input.toUpperCase(): null;
050            }
051        };
052    }
053
054}