Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 *  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.
 */

public class Main {
    /**
     * Generates a formatted text string given a source string containing
     * "argument markers" of the form "{argNum}" where each argNum must be in
     * the range 0..9. The result is generated by inserting the toString of each
     * argument into the position indicated in the string.
     * <p>
     * To insert the "{" character into the output, use a single backslash
     * character to escape it (i.e. "\{"). The "}" character does not need to be
     * escaped.
     * 
     * @param format
     *            String the format to use when printing.
     * @param args
     *            Object[] the arguments to use.
     * @return String the formatted message.
     */
    public static String format(String format, Object[] args) {
        StringBuilder answer = new StringBuilder(format.length() + (args.length * 20));
        String[] argStrings = new String[args.length];
        for (int i = 0; i < args.length; ++i) {
            if (args[i] == null)
                argStrings[i] = "<null>";
            else
                argStrings[i] = args[i].toString();
        }
        int lastI = 0;
        for (int i = format.indexOf('{', 0); i >= 0; i = format.indexOf('{', lastI)) {
            if (i != 0 && format.charAt(i - 1) == '\\') {
                // It's escaped, just print and loop.
                if (i != 1)
                    answer.append(format.substring(lastI, i - 1));
                answer.append('{');
                lastI = i + 1;
            } else {
                // It's a format character.
                if (i > format.length() - 3) {
                    // Bad format, just print and loop.
                    answer.append(format.substring(lastI, format.length()));
                    lastI = format.length();
                } else {
                    int argnum = (byte) Character.digit(format.charAt(i + 1), 10);
                    if (argnum < 0 || format.charAt(i + 2) != '}') {
                        // Bad format, just print and loop.
                        answer.append(format.substring(lastI, i + 1));
                        lastI = i + 1;
                    } else {
                        // Got a good one!
                        answer.append(format.substring(lastI, i));
                        if (argnum >= argStrings.length)
                            answer.append("<missing argument>");
                        else
                            answer.append(argStrings[argnum]);
                        lastI = i + 3;
                    }
                }
            }
        }
        if (lastI < format.length())
            answer.append(format.substring(lastI, format.length()));
        return answer.toString();
    }
}