content: /*
   * 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 openjdk.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 openjdk.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;
  }
  