jjg@46: /*
ohair@554:  * Copyright (c) 2007, 2008, Oracle and/or its affiliates. All rights reserved.
jjg@46:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
jjg@46:  *
jjg@46:  * This code is free software; you can redistribute it and/or modify it
jjg@46:  * under the terms of the GNU General Public License version 2 only, as
ohair@554:  * published by the Free Software Foundation.  Oracle designates this
jjg@46:  * particular file as subject to the "Classpath" exception as provided
ohair@554:  * by Oracle in the LICENSE file that accompanied this code.
jjg@46:  *
jjg@46:  * This code is distributed in the hope that it will be useful, but WITHOUT
jjg@46:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
jjg@46:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
jjg@46:  * version 2 for more details (a copy is included in the LICENSE file that
jjg@46:  * accompanied this code).
jjg@46:  *
jjg@46:  * You should have received a copy of the GNU General Public License version
jjg@46:  * 2 along with this work; if not, write to the Free Software Foundation,
jjg@46:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
jjg@46:  *
ohair@554:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
ohair@554:  * or visit www.oracle.com if you need additional information or have any
ohair@554:  * questions.
jjg@46:  */
jjg@46: 
jjg@46: package com.sun.tools.classfile;
jjg@46: 
jjg@46: import java.io.BufferedInputStream;
jjg@46: import java.io.ByteArrayInputStream;
jjg@46: import java.io.DataInputStream;
jjg@46: import java.io.IOException;
jjg@46: import java.io.InputStream;
jjg@46: 
jjg@46: /**
jjg@581:  *  <p><b>This is NOT part of any supported API.
jjg@581:  *  If you write code that depends on this, you do so at your own risk.
jjg@46:  *  This code and its internal interfaces are subject to change or
jjg@46:  *  deletion without notice.</b>
jjg@46:  */
jjg@46: public class ClassReader {
jjg@46:     ClassReader(ClassFile classFile, InputStream in, Attribute.Factory attributeFactory) throws IOException {
jjg@46:         // null checks
jjg@46:         classFile.getClass();
jjg@46:         attributeFactory.getClass();
jjg@46: 
jjg@46:         this.classFile = classFile;
jjg@46:         this.in = new DataInputStream(new BufferedInputStream(in));
jjg@46:         this.attributeFactory = attributeFactory;
jjg@46:     }
jjg@46: 
jjg@46:     ClassFile getClassFile() {
jjg@46:         return classFile;
jjg@46:     }
jjg@46: 
jjg@46:     ConstantPool getConstantPool() {
jjg@46:         return classFile.constant_pool;
jjg@46:     }
jjg@46: 
jjg@46:     public Attribute readAttribute() throws IOException {
jjg@46:         int name_index = readUnsignedShort();
jjg@46:         int length = readInt();
jjg@46:         byte[] data = new byte[length];
jjg@46:         readFully(data);
jjg@46: 
jjg@46:         DataInputStream prev = in;
jjg@46:         in = new DataInputStream(new ByteArrayInputStream(data));
jjg@46:         try {
jjg@46:             return attributeFactory.createAttribute(this, name_index, data);
jjg@46:         } finally {
jjg@46:             in = prev;
jjg@46:         }
jjg@46:     }
jjg@46: 
jjg@46:     public void readFully(byte[] b) throws IOException {
jjg@46:         in.readFully(b);
jjg@46:     }
jjg@46: 
jjg@46:     public int readUnsignedByte() throws IOException {
jjg@46:         return in.readUnsignedByte();
jjg@46:     }
jjg@46: 
jjg@46:     public int readUnsignedShort() throws IOException {
jjg@46:         return in.readUnsignedShort();
jjg@46:     }
jjg@46: 
jjg@46:     public int readInt() throws IOException {
jjg@46:         return in.readInt();
jjg@46:     }
jjg@46: 
jjg@46:     public long readLong() throws IOException {
jjg@46:         return in.readLong();
jjg@46:     }
jjg@46: 
jjg@46:     public float readFloat() throws IOException {
jjg@46:         return in.readFloat();
jjg@46:     }
jjg@46: 
jjg@46:     public double readDouble() throws IOException {
jjg@46:         return in.readDouble();
jjg@46:     }
jjg@46: 
jjg@46:     public String readUTF() throws IOException {
jjg@46:         return in.readUTF();
jjg@46:     }
jjg@46: 
jjg@46:     private DataInputStream in;
jjg@46:     private ClassFile classFile;
jjg@46:     private Attribute.Factory attributeFactory;
jjg@46: }