http://xmlgraphics.apache.org/fop/: Apache FOP (Formatting Objects Processor) is the world's first print formatter driven by XSL formatting objects (XSL-FO) and the world's first output independent formatter. It is a Java application that reads a formatting object (FO) tree and renders the resulting pages to a specified output. Output formats currently supported include PDF, PCL, PS, AFP, TIFF, PNG, SVG, XML (area tree representation), Print, AWT and TXT. The primary output target is PDF. (Apache Software Foundation) 
/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.
 */

/* $Id: StringUtils.java 1616668 2014-08-08 03:48:54Z gadams $ */

package org.apache.fop.afp.util;


Library of utility methods useful in dealing with strings.

/**
 * Library of utility methods useful in dealing with strings.
 *
 */
public final class StringUtils {

    private StringUtils() {
    }

    
Padds the string to the left with the given character for
the specified length.

Params:
  • input – The input string.
  • padding – The char used for padding.
  • length – The length of the new string.
Returns:The padded string.
/**
     * Padds the string to the left with the given character for
     * the specified length.
     * @param input The input string.
     * @param padding The char used for padding.
     * @param length The length of the new string.
     * @return The padded string.
     */
    public static String lpad(String input, char padding, int length) {

        if (input == null) {
            input = "";
        }

        if (input.length() >= length) {
            return input;
        } else {
            StringBuffer result = new StringBuffer();
            int numChars = length - input.length();
            for (int i = 0; i < numChars; i++) {
                result.append(padding);
            }
            result.append(input);
            return result.toString();
        }
    }

    
Padds the string to the right with the given character for
the specified length.

Params:
  • input – The input string.
  • padding – The char used for padding.
  • length – The length of the new string.
Returns:The padded string.
/**
     * Padds the string to the right with the given character for
     * the specified length.
     * @param input The input string.
     * @param padding The char used for padding.
     * @param length The length of the new string.
     * @return The padded string.
     */
    public static String rpad(String input, char padding, int length) {

        if (input == null) {
            input = "";
        }

        if (input.length() >= length) {
            return input;
        } else {
            StringBuffer result = new StringBuffer(input);
            int numChars = length - input.length();
            for (int i = 0; i < numChars; i++) {
                result.append(padding);
            }
            return result.toString();
        }
    }

}