aoqi@0: /*
aoqi@0:  * Copyright (c) 2007, 2013, Oracle and/or its affiliates. All rights reserved.
aoqi@0:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0:  *
aoqi@0:  * This code is free software; you can redistribute it and/or modify it
aoqi@0:  * under the terms of the GNU General Public License version 2 only, as
aoqi@0:  * published by the Free Software Foundation.  Oracle designates this
aoqi@0:  * particular file as subject to the "Classpath" exception as provided
aoqi@0:  * by Oracle in the LICENSE file that accompanied this code.
aoqi@0:  *
aoqi@0:  * This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
aoqi@0:  * version 2 for more details (a copy is included in the LICENSE file that
aoqi@0:  * accompanied this code).
aoqi@0:  *
aoqi@0:  * You should have received a copy of the GNU General Public License version
aoqi@0:  * 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0:  *
aoqi@0:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0:  * or visit www.oracle.com if you need additional information or have any
aoqi@0:  * questions.
aoqi@0:  */
aoqi@0: 
aoqi@0: package com.sun.tools.classfile;
aoqi@0: 
aoqi@0: import java.io.File;
aoqi@0: import java.io.IOException;
aoqi@0: import java.io.InputStream;
aoqi@0: import java.nio.file.Files;
aoqi@0: import java.nio.file.Path;
aoqi@0: 
aoqi@0: import static com.sun.tools.classfile.AccessFlags.*;
aoqi@0: 
aoqi@0: /**
aoqi@0:  * See JVMS, section 4.2.
aoqi@0:  *
aoqi@0:  *  <p><b>This is NOT part of any supported API.
aoqi@0:  *  If you write code that depends on this, you do so at your own risk.
aoqi@0:  *  This code and its internal interfaces are subject to change or
aoqi@0:  *  deletion without notice.</b>
aoqi@0:  */
aoqi@0: public class ClassFile {
aoqi@0:     public static ClassFile read(File file)
aoqi@0:             throws IOException, ConstantPoolException {
aoqi@0:         return read(file.toPath(), new Attribute.Factory());
aoqi@0:     }
aoqi@0: 
aoqi@0:     public static ClassFile read(Path input)
aoqi@0:             throws IOException, ConstantPoolException {
aoqi@0:         return read(input, new Attribute.Factory());
aoqi@0:     }
aoqi@0: 
aoqi@0:     public static ClassFile read(Path input, Attribute.Factory attributeFactory)
aoqi@0:             throws IOException, ConstantPoolException {
aoqi@0:         try (InputStream in = Files.newInputStream(input)) {
aoqi@0:             return new ClassFile(in, attributeFactory);
aoqi@0:         }
aoqi@0:     }
aoqi@0: 
aoqi@0:     public static ClassFile read(File file, Attribute.Factory attributeFactory)
aoqi@0:             throws IOException, ConstantPoolException {
aoqi@0:         return read(file.toPath(), attributeFactory);
aoqi@0:     }
aoqi@0: 
aoqi@0:     public static ClassFile read(InputStream in)
aoqi@0:             throws IOException, ConstantPoolException {
aoqi@0:         return new ClassFile(in, new Attribute.Factory());
aoqi@0:     }
aoqi@0: 
aoqi@0:     public static ClassFile read(InputStream in, Attribute.Factory attributeFactory)
aoqi@0:             throws IOException, ConstantPoolException {
aoqi@0:         return new ClassFile(in, attributeFactory);
aoqi@0:     }
aoqi@0: 
aoqi@0:     ClassFile(InputStream in, Attribute.Factory attributeFactory) throws IOException, ConstantPoolException {
aoqi@0:         ClassReader cr = new ClassReader(this, in, attributeFactory);
aoqi@0:         magic = cr.readInt();
aoqi@0:         minor_version = cr.readUnsignedShort();
aoqi@0:         major_version = cr.readUnsignedShort();
aoqi@0:         constant_pool = new ConstantPool(cr);
aoqi@0:         access_flags = new AccessFlags(cr);
aoqi@0:         this_class = cr.readUnsignedShort();
aoqi@0:         super_class = cr.readUnsignedShort();
aoqi@0: 
aoqi@0:         int interfaces_count = cr.readUnsignedShort();
aoqi@0:         interfaces = new int[interfaces_count];
aoqi@0:         for (int i = 0; i < interfaces_count; i++)
aoqi@0:             interfaces[i] = cr.readUnsignedShort();
aoqi@0: 
aoqi@0:         int fields_count = cr.readUnsignedShort();
aoqi@0:         fields = new Field[fields_count];
aoqi@0:         for (int i = 0; i < fields_count; i++)
aoqi@0:             fields[i] = new Field(cr);
aoqi@0: 
aoqi@0:         int methods_count = cr.readUnsignedShort();
aoqi@0:         methods = new Method[methods_count];
aoqi@0:         for (int i = 0; i < methods_count; i++)
aoqi@0:             methods[i] = new Method(cr);
aoqi@0: 
aoqi@0:         attributes = new Attributes(cr);
aoqi@0:     }
aoqi@0: 
aoqi@0:     public ClassFile(int magic, int minor_version, int major_version,
aoqi@0:             ConstantPool constant_pool, AccessFlags access_flags,
aoqi@0:             int this_class, int super_class, int[] interfaces,
aoqi@0:             Field[] fields, Method[] methods, Attributes attributes) {
aoqi@0:         this.magic = magic;
aoqi@0:         this.minor_version = minor_version;
aoqi@0:         this.major_version = major_version;
aoqi@0:         this.constant_pool = constant_pool;
aoqi@0:         this.access_flags = access_flags;
aoqi@0:         this.this_class = this_class;
aoqi@0:         this.super_class = super_class;
aoqi@0:         this.interfaces = interfaces;
aoqi@0:         this.fields = fields;
aoqi@0:         this.methods = methods;
aoqi@0:         this.attributes = attributes;
aoqi@0:     }
aoqi@0: 
aoqi@0:     public String getName() throws ConstantPoolException {
aoqi@0:         return constant_pool.getClassInfo(this_class).getName();
aoqi@0:     }
aoqi@0: 
aoqi@0:     public String getSuperclassName() throws ConstantPoolException {
aoqi@0:         return constant_pool.getClassInfo(super_class).getName();
aoqi@0:     }
aoqi@0: 
aoqi@0:     public String getInterfaceName(int i) throws ConstantPoolException {
aoqi@0:         return constant_pool.getClassInfo(interfaces[i]).getName();
aoqi@0:     }
aoqi@0: 
aoqi@0:     public Attribute getAttribute(String name) {
aoqi@0:         return attributes.get(name);
aoqi@0:     }
aoqi@0: 
aoqi@0:     public boolean isClass() {
aoqi@0:         return !isInterface();
aoqi@0:     }
aoqi@0: 
aoqi@0:     public boolean isInterface() {
aoqi@0:         return access_flags.is(ACC_INTERFACE);
aoqi@0:     }
aoqi@0: 
aoqi@0:     public int byteLength() {
aoqi@0:         return  4 +     // magic
aoqi@0:                 2 +     // minor
aoqi@0:                 2 +     // major
aoqi@0:                 constant_pool.byteLength() +
aoqi@0:                 2 +     // access flags
aoqi@0:                 2 +     // this_class
aoqi@0:                 2 +     // super_class
aoqi@0:                 byteLength(interfaces) +
aoqi@0:                 byteLength(fields) +
aoqi@0:                 byteLength(methods) +
aoqi@0:                 attributes.byteLength();
aoqi@0:     }
aoqi@0: 
aoqi@0:     private int byteLength(int[] indices) {
aoqi@0:         return 2 + 2 * indices.length;
aoqi@0:     }
aoqi@0: 
aoqi@0:     private int byteLength(Field[] fields) {
aoqi@0:         int length = 2;
aoqi@0:         for (Field f: fields)
aoqi@0:             length += f.byteLength();
aoqi@0:         return length;
aoqi@0:     }
aoqi@0: 
aoqi@0:     private int byteLength(Method[] methods) {
aoqi@0:         int length = 2;
aoqi@0:         for (Method m: methods)
aoqi@0:             length += m.byteLength();
aoqi@0:         return length;
aoqi@0:     }
aoqi@0: 
aoqi@0:     public final int magic;
aoqi@0:     public final int minor_version;
aoqi@0:     public final int major_version;
aoqi@0:     public final ConstantPool constant_pool;
aoqi@0:     public final AccessFlags access_flags;
aoqi@0:     public final int this_class;
aoqi@0:     public final int super_class;
aoqi@0:     public final int[] interfaces;
aoqi@0:     public final Field[] fields;
aoqi@0:     public final Method[] methods;
aoqi@0:     public final Attributes attributes;
aoqi@0: }