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A driver to allow deep interaction with the JVM without any restrictions
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/*
 * This file is part of ToolFactory JVM driver.
 *
 * Hosted at: https://github.com/toolfactory/jvm-driver
 *
 * --
 *
 * The MIT License (MIT)
 *
 * Copyright (c) 2021 Luke Hutchison, Roberto Gentili
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated
 * documentation files (the "Software"), to deal in the Software without restriction, including without
 * limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
 * the Software, and to permit persons to whom the Software is furnished to do so, subject to the following
 * conditions:
 *
 * The above copyright notice and this permission notice shall be included in all copies or substantial
 * portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT
 * LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO
 * EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
 * OR OTHER DEALINGS IN THE SOFTWARE.
 */
package io.github.toolfactory.jvm.util;


import java.nio.ByteBuffer;


public class JavaClass {
	protected int modifiers;
	protected String name;
	protected String simpleName;
	protected String packageName;
	protected String superClassName;
	protected String[] interfaceNames;

	protected JavaClass(ByteBuffer byteCode) {
		this(Classes.File.Reader.retrieveInfo(BufferHandler.shareContent(byteCode)));
	}

	protected JavaClass(byte[] byteCode) {
		this(Classes.File.Reader.retrieveInfo(byteCode));
	}

	protected JavaClass(Classes.RawInfo rawInfo) {
		this.modifiers = rawInfo.modifiers;
		String rawName = rawInfo.getName();
		String[] classNames = retrieveNames(rawName);
		packageName = classNames[0];
		simpleName = classNames[1];
		name = classNames[2];
		superClassName = retrieveName(rawInfo.getSuperClassName());
		String[] interfaceRawNames = rawInfo.getInterfaceNames();
		interfaceNames = new String[interfaceRawNames.length];
		for (int i = 0; i < interfaceRawNames.length; i++) {
			interfaceNames[i] = retrieveName(interfaceRawNames[i]);
		}

	}

	public static JavaClass create(ByteBuffer byteCode) {
		return new JavaClass(byteCode);
	}

	public static JavaClass create(byte[] byteCode) {
		return new JavaClass(byteCode);
	}

	private String retrieveName(String rawName) {
		try {
			return rawName.replace("/", ".");
		} catch (NullPointerException exc) {
			//for module-info.class
			return null;
		}
	}

	private String[] retrieveNames(String rawName) {
		String[] names = new String[3];
		String rawPackageName = rawName.contains("/") ?
			rawName.substring(0, rawName.lastIndexOf("/")) :
				null;
		if (rawPackageName != null) {
			//packageName
			names[0] = rawPackageName.replace("/", ".");
		}
		//simpleName
		names[1] = rawName.contains("/") ?
			rawName.substring(rawName.lastIndexOf("/") + 1) :
			rawName;
		names[2] = (names[0] != null? names[0] + "." : "") + names[1];
		return names;
	}

	public String getName() {
		return name;
	}

	public String getSimpleName() {
		return simpleName;
	}

	public String getPackageName() {
		return packageName;
	}

	public String getSuperClassName() {
		return superClassName;
	}

	public String[] getInterfaceNames() {
		return interfaceNames;
	}

	public boolean isPublic() {
		return (modifiers & 0x0001) != 0;
	}

	public boolean isFinal() {
		return (modifiers & 0x0010) != 0;
	}

	public boolean isInterface() {
		return (modifiers & 0x0200) != 0;
	}

	public boolean isAbstract() {
		return (modifiers & 0x0400) != 0;
	}

	public boolean isAnnotation() {
		return (modifiers & 0x2000) != 0;
	}

	public boolean isEnum() {
		return (modifiers & 0x4000) != 0;
	}

}