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/*
* 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() {
}
}
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