Mega Code Archive
Left pad the given text parameter
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/*
* Copyright 2008-2010 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.kaleidofoundry.core.util;
/**
* String Helper static method
*
* @author Jerome RADUGET
*/
public abstract class StringHelper {
/**
* Left pad the given text parameter
*
* <pre>
* <b>Assertions:</b>
* assertNull(StringHelper.leftPad(null, 10));
* assertEquals("", StringHelper.leftPad("", 0));
* assertEquals(" ", StringHelper.leftPad("", 1));
* assertEquals(" ", StringHelper.leftPad("", 5));
* assertEquals(" Hello", StringHelper.leftPad("Hello", 10));
* assertEquals(" ", StringHelper.leftPad(" ", 0));
* assertEquals(" ", StringHelper.leftPad(" ", 1));
* assertEquals(" ", StringHelper.leftPad(" ", 3));
* </pre>
*
* @param text
* @param size
* @return Left pad of the given text parameter
*/
public static String leftPad(final String text, final int size) {
return leftPad(text, size, ' ');
}
/**
* Left pad the given text parameter
*
* <pre>
* <b>Assertions:</b>
* assertNull(StringHelper.leftPad(null, 10, '*'));
* assertEquals("", StringHelper.leftPad("", 0, '*'));
* assertEquals("*", StringHelper.leftPad("", 1, '*'));
* assertEquals("*****", StringHelper.leftPad("", 5, '*'));
* assertEquals("*****Hello", StringHelper.leftPad("Hello", 10, '*'));
* assertEquals("*****", StringHelper.leftPad("*****", 0, '*'));
* assertEquals("*****", StringHelper.leftPad("*****", 1, '*'));
* assertEquals("*****", StringHelper.leftPad("*****", 3, '*'));
* </pre>
*
* @param text
* @param size
* @param padChar
* @return Left pad of the given text parameter
*/
public static String leftPad(final String text, final int size,
final char padChar) {
if (text == null) {
return null;
}
final StringBuilder paddedText = new StringBuilder(size);
while (paddedText.length() < size - text.length()) {
paddedText.append(padChar);
}
paddedText.append(text);
return paddedText.toString();
}
}
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