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/*
* Copyright (c) 2004, 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.share.gc;
import java.io.*;
/**
* <tt>Generator</tt> creates classes that have huge number of fields
* (about 65536). All files are generated into a directory that is passed
* as a first argument to method <code>main</code> The classes are intended to
* be used used by <code>gc/gctests/LargeObjects/large00*</code> tests.
* <p>
* The class generates:
* <ul>
* <li> 8 "simple" parent classes that have 65500 fields of 7 primitive
* types and type Object and have just one modifier;
* <li> 8 "simple" child classes that extend correspondent parent class and
* have 46 fileds of the same type (total number of fields in the class
* is over the limitation 65535);
* <li> 8 "simple" child classes that extend correspondent parent class and
* have 35 fileds of the same type (total number of fields in the class
* is under the limitation 65535);
* <li> 5 "combined" parent classes that have 32616 fields of each primitive
* types, type Object, one and two dimensional arrays of each type with
* one modifier;
* <li> 5 "combined" child classes that extend correspondent parent class and
* have 33030 fileds (total number of fields in the class is over the
* limitation 65535);
* <li> 5 "combined" child classes that extend correspondent parent class and
* have 33018 fileds (total number of fields in the class is under the
* limitation 65535).
* </ul>
*/
public class Generator {
// All tested field types
private final static String[] TYPES = {"byte", "int", "long", "short",
"boolean", "double", "float",
"Object"};
// All tested field modifiers
private final static String[] SIMPLE_MODIFIERS = {"static", "private",
"public", "protected",
"transient", "volatile",
"static", "public"};
// All tested field modifiers
private final static String[] COMBINED_MODIFIERS = {"static", "public",
"protected", "transient",
"volatile"};
// Some constants that are used during generaion of each file
private final static String EXT = ".java";
private final static String PACKAGE = "package nsk.share.gc.newclass;\n";
private final static String CLASS_BEGIN = "public class ";
private final static String PARENT_SUFFIX = "parent";
private final static String PARENT_FIELD_PREFIX = "p";
private final static int SIMPLE_PARENT_FIELDS_NUM = 65500;
private final static int COMBINED_PARENT_FIELDS_NUM = 32616;
private final static String FIELD_NAME = "f";
private final static String LCHILD_SUFFIX = "lchild";
private final static int SIMPLE_LCHILD_FIELDS_NUM = 46;
private final static int COMBINED_LCHILD_FIELDS_NUM = 33030;
private final static String SCHILD_SUFFIX = "schild";
private final static int SIMPLE_SCHILD_FIELDS_NUM = 35;
private final static int COMBINED_SCHILD_FIELDS_NUM = 33018;
/**
* Default constructor.
*
*/
public Generator() {}
/**
* Generates classes.
*
* @param argv array of arguments passed to the class.
*
* @throws <tt>FileNotFoundException</tt> if directory that.is passed as
* the first argument does not exist.
*
*/
public static void main(String[] argv) throws FileNotFoundException {
// Generate classes that have fields of one type and with one
// modifier
for (int i = 0; i < SIMPLE_MODIFIERS.length; i++)
generateSimple(System.out, argv[0], TYPES[i], SIMPLE_MODIFIERS[i]);
// Generate classes that have fields of different types with one
// modifier
for (int i = 0; i < COMBINED_MODIFIERS.length; i++)
generateCombined(System.out, argv[0], COMBINED_MODIFIERS[i]);
}
// Generate classes that have fields of one type and with one modifier
private static void generateSimple(PrintStream out, String dir, String type,
String modifier) throws FileNotFoundException {
// Generate parent class
String parentName = modifier + "_" + type + "_" + PARENT_SUFFIX;
try (PrintWriter pw = getPrintWriter(dir, parentName + EXT)) {
pw.println(PACKAGE);
pw.println(CLASS_BEGIN + parentName + " {");
// Even if "private" modifier is tested, parent class must have "public"
// fields, so that child class could have access to them
String m = modifier;
if (modifier.equals("private"))
m = "public";
for (int i = 0; i < SIMPLE_PARENT_FIELDS_NUM; i++)
pw.println(m + " " + type + " "
+ PARENT_FIELD_PREFIX + FIELD_NAME + (i + 1) + ";");
pw.println("public Object objP = null;");
pw.println("}");
}
// Generate two children that extend the parent
generateSimpleChild(modifier + "_" + type + "_" + LCHILD_SUFFIX,
type, modifier, dir, parentName,
SIMPLE_LCHILD_FIELDS_NUM);
generateSimpleChild(modifier + "_" + type + "_" + SCHILD_SUFFIX,
type, modifier, dir, parentName,
SIMPLE_SCHILD_FIELDS_NUM);
}
// Generate a child that extends specified parent class
private static void generateSimpleChild(String className, String type,
String modifier, String dir,
String parentName, int num)
throws FileNotFoundException {
try (PrintWriter pw = getPrintWriter(dir, className + EXT)) {
pw.println(PACKAGE);
pw.println(CLASS_BEGIN + className + " extends " + parentName + " {");
for (int i = 0; i < num; i++)
pw.println(modifier + " " + type + " " + FIELD_NAME + (i + 1)
+ ";");
pw.println("public Object objC = null;");
pw.println("}");
}
}
// Generate classes that have fields of different types with one modifier
private static void generateCombined(PrintStream out, String dir,
String modifier) throws FileNotFoundException {
// Generate parent class
String parentName = modifier + "_combination_" + PARENT_SUFFIX;
try (PrintWriter pw = getPrintWriter(dir, parentName + EXT)){
pw.println(PACKAGE);
pw.println(CLASS_BEGIN + parentName + " {");
String pattern = PARENT_FIELD_PREFIX + FIELD_NAME;
for (int i = 0; i < COMBINED_PARENT_FIELDS_NUM; ) {
for (int j = 0; j < TYPES.length; j++) {
pw.println(modifier + " " + TYPES[j] + " "
+ pattern + (i + 1) + ", "
+ pattern + (i + 2) + "[], "
+ pattern + (i + 3) + "[][];");
i = i + 3;
}
}
pw.println("public Object objP = null;");
pw.println("}");
}
// Generate two children that extend the parent
generateCombinedChild(modifier + "_combination_" + LCHILD_SUFFIX,
modifier, dir, parentName,
COMBINED_LCHILD_FIELDS_NUM);
generateCombinedChild(modifier + "_combination_" + SCHILD_SUFFIX,
modifier, dir, parentName,
COMBINED_SCHILD_FIELDS_NUM);
}
// Generate a child that extends specified parent class
private static void generateCombinedChild(String className, String modifier,
String dir, String parentName,
int num)
throws FileNotFoundException {
try (PrintWriter pw = getPrintWriter(dir, className + EXT)) {
pw.println(PACKAGE);
pw.println(CLASS_BEGIN + className + " extends " + parentName + " {");
for (int i = 0; i < num; )
for (int j = 0; j < TYPES.length; j++) {
pw.println(modifier + " " + TYPES[j] + " "
+ FIELD_NAME + (i + 1) + ", "
+ FIELD_NAME + (i + 2) + "[], "
+ FIELD_NAME + (i + 3) + "[][];");
i = i + 3;
if (i >= num)
break;
}
pw.println("public Object objC = null;");
pw.println("}");
}
}
// Create a new PrintWriter
private static PrintWriter getPrintWriter(String dir, String name)
throws FileNotFoundException {
FileOutputStream stream = new FileOutputStream(new File(dir, name));
return new PrintWriter(stream, true);
}
}
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