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/*
* Copyright (c) 2002, 2018, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code 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 General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package nsk.sysdict.share;
import java.io.*;
/**
* This tools generates a binary tree of classes.
* For more details, use:
* <pre>
* java BTreeGen -help
* </pre>
*/
public class BTreeGen {
private static final int HEIGHT = 12; // default tree height
private static final int WEIGHT = 200; // as many longs in each node
private static void explain(Object x) {
System.err.println("# " + x);
}
public static void main(String args[]) {
if (args.length < 1 || args[0].toLowerCase().startsWith("-h")) {
explain("This tools generates a binary tree of classes:");
explain("");
explain(" BTree0");
explain(" / \\");
explain(" BTree0L BTree0R");
explain(" / \\ / \\");
explain(" ... ... ... ...");
explain("");
explain("Use:");
explain(" java BTreeGen { $HEIGHT [ $WEIGHT ] | \"default\" }");
explain("");
explain("Generates:");
explain(" BTree.java class having HEIGHT constant.");
explain(" BTree0.java defining a classes tree.");
explain("");
explain("Here:");
explain(" HEIGHT and WEIGHT must be positive integers.");
explain(" Default HEIGHT is " + HEIGHT + " ("
+ ((1<<HEIGHT)-1) + " classes in a tree).");
explain(" Default WEIGHT is " + WEIGHT + ".");
System.exit(1);
};
int height = HEIGHT;
int weight = WEIGHT;
if (!args[0].toLowerCase().equals("default")) {
height = Integer.parseInt(args[0]);
if (args.length > 1)
weight = Integer.parseInt(args[1]);
};
try {
doit(height, weight);
} catch (IOException exception) {
exception.printStackTrace(System.err);
System.exit(1);
}
}
private static void doit(int height, int weight)
throws FileNotFoundException
{
// Constant definition:
PrintStream info;
info = new PrintStream(new FileOutputStream(new File("BTreeInfo.java")));
info.println("// This file is generated by: BTreeGen.java");
info.println("package nsk.sysdict.share;");
info.println("import nsk.share.*;");
info.println("public class BTreeInfo {");
info.println(" public static final int HEIGHT = " + height + ";");
info.println(" private static final int WEIGHT = " + weight + ";");
info.println(" public static final String rootName = \"BTree0\";");
info.println(" public static final Denotation nodesDenotation");
info.println(" = new TreeNodesDenotation(\"LR\");");
info.println("}");
info.close();
// Generate ta classes tree:
PrintStream btree;
btree = new PrintStream(new FileOutputStream(new File("BTree.java")));
btree.println("// This file is generated by: BTreeGen.java");
btree.println("package nsk.sysdict.share;");
new BTreeGen(btree).generate(height,weight);
btree.close();
}
private PrintStream stream;
private BTreeGen(PrintStream stream) {
this.stream = stream;
}
private void println(String s) {
stream.println(s);
}
private void generate(int height, int weight) {
if (height < 1)
throw new IllegalArgumentException("bad height: " + height);
if (weight < 1)
throw new IllegalArgumentException("bad weight: " + weight);
String basename = "BTree0";
genClass(null,basename,weight);
gen(basename,height,weight);
}
private void gen(String name, int height, int weight) {
if (height == 1)
return;
String nameL = name + "L";
String nameR = name + "R";
genClass(name, nameL, weight);
genClass(name, nameR, weight);
gen(nameL, height-1, weight);
gen(nameR, height-1, weight);
}
private void genClass(String baseName, String className, int weight) {
println("class " + className
+ (baseName!=null? " extends " + baseName: "") + " {");
for (int w=1; w<=weight; w++)
println(" static long fill_" + className + "_" + w + ";");
println("}");
}
}
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