Accepts an array of strings and returns the array flattened into a single string, optionally delimeted. - Java java.lang

Java examples for java.lang:String Array

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Description

Accepts an array of strings and returns the array flattened into a single string, optionally delimeted.

Demo Code

/**/*from  w w  w  .  ja  va  2s  . com*/
 * Helios, OpenSource Monitoring
 * Brought to you by the Helios Development Group
 *
 * Copyright 2007, Helios Development Group and individual contributors
 * as indicated by the @author tags. See the copyright.txt file in the
 * distribution for a full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org. 
 *
 */
//package com.java2s;

public class Main {
    public static void main(String[] argv) {
        String delimeter = "java2s.com";
        CharSequence args = "java2s.com";
        System.out.println(fastConcatAndDelim(delimeter, args));
    }

    /**
     * Accepts an array of strings and returns the array flattened into a single string, optionally delimeted.
     * @param skipBlanks If true, blank or null items in the passed array will be skipped.
     * @param delimeter The delimeter to insert between each item.
     * @param args The string array to flatten
     * @return the flattened string
     */
    public static String fastConcatAndDelim(boolean skipBlanks,
            String delimeter, CharSequence... args) {
        StringBuilder buff = getStringBuilder();
        if (args != null && args.length > 0) {
            for (CharSequence s : args) {
                if (!skipBlanks || (s != null && s.length() > 0)) {
                    buff.append(s).append(delimeter);
                }
            }
            if (buff.length() > 0) {
                buff.deleteCharAt(buff.length() - 1);
            }
        }
        return buff.toString();
    }

    /**
     * Accepts an array of strings and returns the array flattened into a single string, optionally delimeted.
     * Blank or zero length items in the array will be skipped.
     * @param delimeter The delimeter to insert between each item.
     * @param args The string array to flatten
     * @return the flattened string
     */
    public static String fastConcatAndDelim(String delimeter,
            CharSequence... args) {
        return fastConcatAndDelim(true, delimeter, args);
    }

    /**
     * Accepts an array of strings and returns the array flattened into a single string, optionally delimeted.
     * @param skip Skip this many
     * @param delimeter The delimeter
     * @param args The strings to concat
     * @return the resulting string
     */
    public static String fastConcatAndDelim(int skip, String delimeter,
            CharSequence... args) {
        StringBuilder buff = getStringBuilder();
        int cnt = args.length - skip;
        int i = 0;
        for (; i < cnt; i++) {
            if (args[i] != null && args[i].length() > 0) {
                buff.append(args[i]).append(delimeter);
            }
        }
        StringBuilder b = buff.reverse();
        while (b.subSequence(0, delimeter.length()).equals(delimeter)) {
            b.delete(0, delimeter.length());
        }
        return b.reverse().toString();
    }

    /**
     * Acquires and truncates the current thread's StringBuilder.
     * @return A truncated string builder for use by the current thread.
     */
    public static StringBuilder getStringBuilder() {
        return new StringBuilder();
    }

    /**
     * Acquires and truncates the current thread's StringBuilder.
     * @param size the inited size of the stringbuilder
     * @return A truncated string builder for use by the current thread.
     */
    public static StringBuilder getStringBuilder(int size) {
        return new StringBuilder(size);
    }
}

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