chrismair | 00dc7bd | 2014-05-11 21:21:28 +0000 | [diff] [blame] | 1 | /*
|
| 2 | * Copyright 2008 the original author or authors.
|
| 3 | *
|
| 4 | * Licensed under the Apache License, Version 2.0 (the "License");
|
| 5 | * you may not use this file except in compliance with the License.
|
| 6 | * You may obtain a copy of the License at
|
| 7 | *
|
| 8 | * http://www.apache.org/licenses/LICENSE-2.0
|
| 9 | *
|
| 10 | * Unless required by applicable law or agreed to in writing, software
|
| 11 | * distributed under the License is distributed on an "AS IS" BASIS,
|
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
| 13 | * See the License for the specific language governing permissions and
|
| 14 | * limitations under the License.
|
| 15 | */
|
| 16 | package org.mockftpserver.core.util;
|
| 17 |
|
| 18 | import java.util.Collection;
|
| 19 | import java.util.Iterator;
|
| 20 |
|
| 21 | /**
|
| 22 | * Contains static String-related utility methods.
|
| 23 | *
|
| 24 | * @author Chris Mair
|
| 25 | * @version $Revision$ - $Date$
|
| 26 | */
|
| 27 | public class StringUtil {
|
| 28 |
|
| 29 | /**
|
| 30 | * Pad the specified String with spaces to the right to the specified width. If the length
|
| 31 | * of string is already equal to or greater than width, then just return string.
|
| 32 | *
|
| 33 | * @param string - the String to pad
|
| 34 | * @param width - the target width
|
| 35 | * @return a String of at least width characters, padded on the right with spaces as necessary
|
| 36 | */
|
| 37 | public static String padRight(String string, int width) {
|
| 38 | int numSpaces = width - string.length();
|
| 39 | return (numSpaces > 0) ? string + spaces(numSpaces) : string;
|
| 40 | }
|
| 41 |
|
| 42 | /**
|
| 43 | * Pad the specified String with spaces to the left to the specified width. If the length
|
| 44 | * of string is already equal to or greater than width, then just return string.
|
| 45 | *
|
| 46 | * @param string - the String to pad
|
| 47 | * @param width - the target width
|
| 48 | * @return a String of at least width characters, padded on the left with spaces as necessary
|
| 49 | */
|
| 50 | public static String padLeft(String string, int width) {
|
| 51 | int numSpaces = width - string.length();
|
| 52 | return (numSpaces > 0) ? spaces(numSpaces) + string : string;
|
| 53 | }
|
| 54 |
|
| 55 | /**
|
| 56 | * Join the Strings within the parts Collection, inserting the delimiter in between elements
|
| 57 | *
|
| 58 | * @param parts - the Collection of Strings to join
|
| 59 | * @param delimiter - the delimiter String to insert between the parts
|
| 60 | * @return the Strings within the parts collection joined together using the specified delimiter
|
| 61 | */
|
| 62 | public static String join(Collection parts, String delimiter) {
|
| 63 | Assert.notNull(parts, "parts");
|
| 64 | Assert.notNull(delimiter, "delimiter");
|
| 65 |
|
| 66 | StringBuffer buf = new StringBuffer();
|
| 67 | Iterator iter = parts.iterator();
|
| 68 | while (iter.hasNext()) {
|
| 69 | String component = (String) iter.next();
|
| 70 | buf.append(component);
|
| 71 | if (iter.hasNext()) {
|
| 72 | buf.append(delimiter);
|
| 73 | }
|
| 74 | }
|
| 75 | return buf.toString();
|
| 76 | }
|
| 77 |
|
| 78 | //--------------------------------------------------------------------------
|
| 79 | // Internal Helper Methods
|
| 80 | //--------------------------------------------------------------------------
|
| 81 |
|
| 82 | private static String spaces(int numSpaces) {
|
| 83 | StringBuffer buf = new StringBuffer();
|
| 84 | for (int i = 0; i < numSpaces; i++) {
|
| 85 | buf.append(" ");
|
| 86 | }
|
| 87 | return buf.toString();
|
| 88 | }
|
| 89 |
|
| 90 | /**
|
| 91 | * Private constructor to prevent instantiation. All members are static.
|
| 92 | */
|
| 93 | private StringUtil() {
|
| 94 | }
|
| 95 |
|
| 96 | } |