/* | |
* Copyright 2008 the original author or authors. | |
* | |
* 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 org.mockftpserver.core.util; | |
import java.util.Collection; | |
import java.util.Iterator; | |
/** | |
* Contains static String-related utility methods. | |
* | |
* @author Chris Mair | |
* @version $Revision$ - $Date$ | |
*/ | |
public class StringUtil { | |
/** | |
* Pad the specified String with spaces to the right to the specified width. If the length | |
* of string is already equal to or greater than width, then just return string. | |
* | |
* @param string - the String to pad | |
* @param width - the target width | |
* @return a String of at least width characters, padded on the right with spaces as necessary | |
*/ | |
public static String padRight(String string, int width) { | |
int numSpaces = width - string.length(); | |
return (numSpaces > 0) ? string + spaces(numSpaces) : string; | |
} | |
/** | |
* Pad the specified String with spaces to the left to the specified width. If the length | |
* of string is already equal to or greater than width, then just return string. | |
* | |
* @param string - the String to pad | |
* @param width - the target width | |
* @return a String of at least width characters, padded on the left with spaces as necessary | |
*/ | |
public static String padLeft(String string, int width) { | |
int numSpaces = width - string.length(); | |
return (numSpaces > 0) ? spaces(numSpaces) + string : string; | |
} | |
/** | |
* Join the Strings within the parts Collection, inserting the delimiter in between elements | |
* | |
* @param parts - the Collection of Strings to join | |
* @param delimiter - the delimiter String to insert between the parts | |
* @return the Strings within the parts collection joined together using the specified delimiter | |
*/ | |
public static String join(Collection parts, String delimiter) { | |
Assert.notNull(parts, "parts"); | |
Assert.notNull(delimiter, "delimiter"); | |
StringBuffer buf = new StringBuffer(); | |
Iterator iter = parts.iterator(); | |
while (iter.hasNext()) { | |
String component = (String) iter.next(); | |
buf.append(component); | |
if (iter.hasNext()) { | |
buf.append(delimiter); | |
} | |
} | |
return buf.toString(); | |
} | |
//-------------------------------------------------------------------------- | |
// Internal Helper Methods | |
//-------------------------------------------------------------------------- | |
private static String spaces(int numSpaces) { | |
StringBuffer buf = new StringBuffer(); | |
for (int i = 0; i < numSpaces; i++) { | |
buf.append(" "); | |
} | |
return buf.toString(); | |
} | |
/** | |
* Private constructor to prevent instantiation. All members are static. | |
*/ | |
private StringUtil() { | |
} | |
} |