Mercurial > jdk8-mips64-public > langtools / file revision

 /*

  * 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.

  *

  *  <p><b>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.</b>

  */

 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;

 }