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JavaClassGenerator.java
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JavaClassGenerator.java
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/*
* Copyright (c) 2018, The Regents of the University of California
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package edu.berkeley.cs.jqf.examples.bcel;
import com.pholser.junit.quickcheck.generator.GenerationStatus;
import com.pholser.junit.quickcheck.generator.Generator;
import com.pholser.junit.quickcheck.random.SourceOfRandomness;
import org.apache.bcel.Const;
import org.apache.bcel.classfile.JavaClass;
import org.apache.bcel.generic.ClassGen;
import org.apache.bcel.generic.ConstantPoolGen;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.function.Consumer;
import java.util.stream.Stream;
/**
* Based on:
* <a href="https://docs.oracle.com/javase/specs/jvms/se8/html/jvms-4.html">
* Java Virtual Machine Specification 4
* </a>
*/
public class JavaClassGenerator extends Generator<JavaClass> {
private static final int MIN_FIELDS = 0;
private static final int MAX_FIELDS = 10;
private static final int MIN_INTERFACES = 0;
private static final int MAX_INTERFACES = 5;
private static final int MIN_METHODS = 0;
private static final int MAX_METHODS = 10;
private static final List<Consumer<ClassGen>> versionList =
Collections.unmodifiableList(Arrays.asList((clazz) -> setVersion(clazz, Const.MAJOR_1_1, Const.MINOR_1_1),
(clazz) -> setVersion(clazz, Const.MAJOR_1_2, Const.MINOR_1_2),
(clazz) -> setVersion(clazz, Const.MAJOR_1_3, Const.MINOR_1_3),
(clazz) -> setVersion(clazz, Const.MAJOR_1_4, Const.MINOR_1_4),
(clazz) -> setVersion(clazz, Const.MAJOR_1_5, Const.MINOR_1_5),
(clazz) -> setVersion(clazz, Const.MAJOR_1_6, Const.MINOR_1_6),
(clazz) -> setVersion(clazz, Const.MAJOR_1_7, Const.MINOR_1_7),
(clazz) -> setVersion(clazz, Const.MAJOR_1_8, Const.MINOR_1_8),
(clazz) -> setVersion(clazz, Const.MAJOR_1_9, Const.MINOR_1_9)));
private final Generator<String> classNameGenerator = new JavaClassNameGenerator(".");
public JavaClassGenerator() {
super(JavaClass.class);
}
public JavaClass generate(SourceOfRandomness random, GenerationStatus status) {
ConstantPoolGen pool = new ConstantPoolGen();
String className = classNameGenerator.generate(random, status);
String superClassName = classNameGenerator.generate(random, status);
String fileName = className.replace('.', '/') + ".class";
ClassGen clazz = new ClassGen(className, superClassName, fileName, 0, new String[0], pool);
setVersion(random, clazz);
setAccessFlags(random, clazz);
Stream.generate(() -> classNameGenerator.generate(random, status))
.limit(random.nextInt(MIN_INTERFACES, MAX_INTERFACES))
.forEach(clazz::addInterface);
Stream.generate(new FieldGenerator(random, status, clazz)::generate)
.limit(random.nextInt(MIN_FIELDS, MAX_FIELDS))
.forEach(clazz::addField);
Stream.generate(new MethodGenerator(random, status, clazz)::generate)
.limit(random.nextInt(MIN_METHODS, MAX_METHODS))
.forEach(clazz::addMethod);
return clazz.getJavaClass();
}
static void setAccessFlags(SourceOfRandomness random, ClassGen clazz) {
if (random.nextBoolean()) {
clazz.isPublic(true);
}
if (random.nextBoolean()) {
clazz.isSynthetic(true);
}
if (random.nextBoolean()) {
// Abstract
clazz.isAbstract(true);
if (random.nextBoolean()) {
clazz.isInterface(true);
if (random.nextBoolean()) {
clazz.isAnnotation(true);
}
} else {
if (random.nextBoolean()) {
clazz.isEnum(true);
}
}
} else {
// Concrete
if (random.nextBoolean()) {
clazz.isEnum(true);
}
if (random.nextBoolean()) {
clazz.isFinal(true);
}
}
}
static void setVersion(SourceOfRandomness random, ClassGen clazz) {
random.choose(versionList).accept(clazz);
}
static void setVersion(ClassGen clazz, int major, int minor) {
clazz.setMajor(major);
clazz.setMinor(minor);
}
}