1 /*

     2  * Copyright (c) 2002, 2018, Oracle and/or its affiliates. All rights reserved.

     3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     4  *

     5  * This code is free software; you can redistribute it and/or modify it

     6  * under the terms of the GNU General Public License version 2 only, as

     7  * published by the Free Software Foundation.

     8  *

     9  * This code is distributed in the hope that it will be useful, but WITHOUT

    10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    12  * version 2 for more details (a copy is included in the LICENSE file that

    13  * accompanied this code).

    14  *

    15  * You should have received a copy of the GNU General Public License version

    16  * 2 along with this work; if not, write to the Free Software Foundation,

    17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    18  *

    19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    20  * or visit www.oracle.com if you need additional information or have any

    21  * questions.

    22  */

    23 

    24 package nsk.sysdict.share;

    25 

    26 import java.io.*;

    27 

    28 /**

    29  * This tools generates a chain of classes.

    30  * For more details, use:

    31  * <pre>

    32  *     java ChainGen -help

    33  * </pre>

    34  */

    35 public class ChainGen {

    36     private static final int FATS_HEIGHT = 5;

    37     private static final int FATS_WEIGHT = 10000;

    38     private static final int LEANS_HEIGHT = 50;

    39     private static final int LEANS_WEIGHT = 1;

    40 

    41     private static void explain(Object x) {

    42         System.err.println("# " + x);

    43     }

    44 

    45     public static void main(String args[]) {

    46         if (args.length < 1 || args[0].toLowerCase().startsWith("-h")) {

    47             explain("Generates a chain classes extending each other.");

    48             explain("");

    49             explain("Use:");

    50             explain("    java ChainGen $NAME $HEIGHT $WEIGHT");

    51             explain("Or:");

    52             explain("    java ChainGen \"fats\"");

    53             explain("Or:");

    54             explain("    java ChainGen \"leans\"");

    55             explain("");

    56             explain("This creates:");

    57             explain("    ${NAME}Info.java class displaying HEIGHT and WEIGHT.");

    58             explain("    ${NAME}XXXXXX.java defining classes chain.");

    59             explain("");

    60             explain("Here:");

    61             explain("    HEIGHT and WEIGHT must be positive integers.");

    62             explain("    Defaults for \"fats\": HEIGHT is " + FATS_HEIGHT

    63                 + ", WEIGHT is " + FATS_WEIGHT +".");

    64             explain("    Defaults for \"leans\": HEIGHT is " + LEANS_HEIGHT

    65                 + ", WEIGHT is " + LEANS_WEIGHT +".");

    66             System.exit(1);

    67         };

    68         String name;

    69         int height, weight;

    70         if (args[0].toLowerCase().equals("fats")) {

    71             name   = "Fats";

    72             height = FATS_HEIGHT;

    73             weight = FATS_WEIGHT;

    74         } else if (args[0].toLowerCase().equals("leans")) {

    75             name   = "Leans";

    76             height = LEANS_HEIGHT;

    77             weight = LEANS_WEIGHT;

    78         } else {

    79             name   = args[0];

    80             height = Integer.parseInt(args[1]);

    81             weight = Integer.parseInt(args[2]);

    82         };

    83         try {

    84             doit(name, height, weight);

    85         } catch (IOException exception) {

    86             exception.printStackTrace(System.err);

    87             System.exit(1);

    88         }

    89     }

    90 

    91     private static void doit(String name, int height, int weight)

    92         throws FileNotFoundException

    93     {

    94         // Constants definition:

    95         PrintStream info = new PrintStream(

    96                 new FileOutputStream(new File(name + "Info.java"))

    97             );

    98         info.println("// This file is generated by: ChainGen.java");

    99         info.println("package nsk.sysdict.share;");

   100         info.println("public class " + name + "Info {");

   101         info.println("    public static final int HEIGHT = " + height + ";");

   102         info.println("    private static final int WEIGHT = " + weight + ";");

   103         info.println("    public static final String rootName = \"" + name + "\";");

   104         info.println("    public static final String[] nodeNames = new String[] {");

   105         // Generate a series of fat classes:

   106         for (int index=0; index<height; index++) {

   107             String suffix = digits(index,6);

   108             String className = name + suffix;

   109             info.println("        \"" + suffix + "\""

   110                 + (index+1<height? "," : ""));

   111             PrintStream chain = new PrintStream(

   112                 new FileOutputStream(new File(className + ".java"))

   113             );

   114             chain.println("// This file is generated by: ChainGen.java");

   115             chain.println("package nsk.sysdict.share;");

   116             chain.println("class " + className

   117                 + (index>0? " extends " + name + digits(index-1,6): "")

   118                 + " {");

   119             for (int w=0; w<weight; w++) {

   120                 String fieldName = "fill_" + className + "_" + digits(w,6);

   121                 chain.println("    static long " + fieldName + ";");

   122             }

   123             chain.println("}");

   124             chain.close();

   125         };

   126         //

   127         info.println("    };");

   128         info.println("}");

   129         info.close();

   130     }

   131 

   132     /**

   133      * Convert <tt>x</tt> to <tt>n</tt>-digits string.

   134      */

   135     private static String digits(int x, int n) {

   136         String s = "" + x;

   137         while (s.length() < n)

   138             s = "0" + s;

   139         return s;

   140     }

   141 }