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/*
 * Copyright (c) 2007, 2013, 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.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * 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 com.sun.tools.classfile;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.nio.file.Files;
import java.nio.file.Path;

import static com.sun.tools.classfile.AccessFlags.*;

/**
 * See JVMS, section 4.2.
 *
 *  

This is NOT part of any supported API. * If you write code that depends on this, you do so at your own risk. * This code and its internal interfaces are subject to change or * deletion without notice. */ public class ClassFile { public static ClassFile read(File file) throws IOException, ConstantPoolException { return read(file.toPath(), new Attribute.Factory()); } public static ClassFile read(Path input) throws IOException, ConstantPoolException { return read(input, new Attribute.Factory()); } public static ClassFile read(Path input, Attribute.Factory attributeFactory) throws IOException, ConstantPoolException { try (InputStream in = Files.newInputStream(input)) { return new ClassFile(in, attributeFactory); } } public static ClassFile read(File file, Attribute.Factory attributeFactory) throws IOException, ConstantPoolException { return read(file.toPath(), attributeFactory); } public static ClassFile read(InputStream in) throws IOException, ConstantPoolException { return new ClassFile(in, new Attribute.Factory()); } public static ClassFile read(InputStream in, Attribute.Factory attributeFactory) throws IOException, ConstantPoolException { return new ClassFile(in, attributeFactory); } ClassFile(InputStream in, Attribute.Factory attributeFactory) throws IOException, ConstantPoolException { ClassReader cr = new ClassReader(this, in, attributeFactory); magic = cr.readInt(); minor_version = cr.readUnsignedShort(); major_version = cr.readUnsignedShort(); constant_pool = new ConstantPool(cr); access_flags = new AccessFlags(cr); this_class = cr.readUnsignedShort(); super_class = cr.readUnsignedShort(); int interfaces_count = cr.readUnsignedShort(); interfaces = new int[interfaces_count]; for (int i = 0; i < interfaces_count; i++) interfaces[i] = cr.readUnsignedShort(); int fields_count = cr.readUnsignedShort(); fields = new Field[fields_count]; for (int i = 0; i < fields_count; i++) fields[i] = new Field(cr); int methods_count = cr.readUnsignedShort(); methods = new Method[methods_count]; for (int i = 0; i < methods_count; i++) methods[i] = new Method(cr); attributes = new Attributes(cr); } public ClassFile(int magic, int minor_version, int major_version, ConstantPool constant_pool, AccessFlags access_flags, int this_class, int super_class, int[] interfaces, Field[] fields, Method[] methods, Attributes attributes) { this.magic = magic; this.minor_version = minor_version; this.major_version = major_version; this.constant_pool = constant_pool; this.access_flags = access_flags; this.this_class = this_class; this.super_class = super_class; this.interfaces = interfaces; this.fields = fields; this.methods = methods; this.attributes = attributes; } public String getName() throws ConstantPoolException { return constant_pool.getClassInfo(this_class).getName(); } public String getSuperclassName() throws ConstantPoolException { return constant_pool.getClassInfo(super_class).getName(); } public String getInterfaceName(int i) throws ConstantPoolException { return constant_pool.getClassInfo(interfaces[i]).getName(); } public Attribute getAttribute(String name) { return attributes.get(name); } public boolean isClass() { return !isInterface(); } public boolean isInterface() { return access_flags.is(ACC_INTERFACE); } public int byteLength() { return 4 + // magic 2 + // minor 2 + // major constant_pool.byteLength() + 2 + // access flags 2 + // this_class 2 + // super_class byteLength(interfaces) + byteLength(fields) + byteLength(methods) + attributes.byteLength(); } private int byteLength(int[] indices) { return 2 + 2 * indices.length; } private int byteLength(Field[] fields) { int length = 2; for (Field f: fields) length += f.byteLength(); return length; } private int byteLength(Method[] methods) { int length = 2; for (Method m: methods) length += m.byteLength(); return length; } public final int magic; public final int minor_version; public final int major_version; public final ConstantPool constant_pool; public final AccessFlags access_flags; public final int this_class; public final int super_class; public final int[] interfaces; public final Field[] fields; public final Method[] methods; public final Attributes attributes; }





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