StringUtil.java Source code

Introduction

Here is the source code for StringUtil.java

Source

import java.util.Collection;
import java.util.Iterator;

/**********************************************************************************
 * $URL: https://source.sakaiproject.org/svn/util/branches/sakai_2-5-4/util-util/util/src/java/org/sakaiproject/util/StringUtil.java $
 * $Id: StringUtil.java 34934 2007-09-10 22:52:23Z lance@indiana.edu $
 ***********************************************************************************
 *
 * Copyright (c) 2003, 2004, 2005, 2006 The Sakai Foundation.
 * 
 * Licensed under the Educational Community License, Version 1.0 (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.opensource.org/licenses/ecl1.php
 * 
 * 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.
 *
 **********************************************************************************/

/**
 * <p>
 * StringUtil collects together some string utility classes.
 * </p>
 */
public class StringUtil {
    /**
     * Reverse the split operation.
     * 
     * @param parts
     *        The parts to combine
     * @param index
     *        the index to the fist part to use
     * @param length
     *        the number of parts to use
     * @param splitter
     *        The between-parts text
     */
    public static String unsplit(String[] parts, int index, int length, String splitter) {
        if (parts == null)
            return null;
        if ((index < 0) || (index >= parts.length))
            return null;
        if (index + length > parts.length)
            return null;

        StringBuilder buf = new StringBuilder();
        for (int i = index; i < index + length; i++) {
            if (parts[i] != null)
                buf.append(parts[i]);
            buf.append(splitter);
        }

        // remove the trailing splitter
        buf.setLength(buf.length() - splitter.length());
        return buf.toString();
    }

}