| /* |
| * Copyright (c) 2007, 2008, 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.BufferedInputStream; |
| import java.io.ByteArrayInputStream; |
| import java.io.DataInputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.util.Objects; |
| |
| /** |
| * <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 ClassReader { |
| ClassReader(ClassFile classFile, InputStream in, Attribute.Factory attributeFactory) throws IOException { |
| this.classFile = Objects.requireNonNull(classFile); |
| this.attributeFactory = Objects.requireNonNull(attributeFactory); |
| this.in = new DataInputStream(new BufferedInputStream(in)); |
| } |
| |
| ClassFile getClassFile() { |
| return classFile; |
| } |
| |
| ConstantPool getConstantPool() { |
| return classFile.constant_pool; |
| } |
| |
| public Attribute readAttribute() throws IOException { |
| int name_index = readUnsignedShort(); |
| int length = readInt(); |
| byte[] data = new byte[length]; |
| readFully(data); |
| |
| DataInputStream prev = in; |
| in = new DataInputStream(new ByteArrayInputStream(data)); |
| try { |
| return attributeFactory.createAttribute(this, name_index, data); |
| } finally { |
| in = prev; |
| } |
| } |
| |
| public void readFully(byte[] b) throws IOException { |
| in.readFully(b); |
| } |
| |
| public int readUnsignedByte() throws IOException { |
| return in.readUnsignedByte(); |
| } |
| |
| public int readUnsignedShort() throws IOException { |
| return in.readUnsignedShort(); |
| } |
| |
| public int readInt() throws IOException { |
| return in.readInt(); |
| } |
| |
| public long readLong() throws IOException { |
| return in.readLong(); |
| } |
| |
| public float readFloat() throws IOException { |
| return in.readFloat(); |
| } |
| |
| public double readDouble() throws IOException { |
| return in.readDouble(); |
| } |
| |
| public String readUTF() throws IOException { |
| return in.readUTF(); |
| } |
| |
| private DataInputStream in; |
| private ClassFile classFile; |
| private Attribute.Factory attributeFactory; |
| } |