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

 /*

  * Copyright 2007 Sun Microsystems, Inc.  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.  Sun designates this

  * particular file as subject to the "Classpath" exception as provided

  * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

  * CA 95054 USA or visit www.sun.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;

 /**

  *  <p><b>This is NOT part of any API supported by Sun Microsystems.  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 {

         // null checks

         classFile.getClass();

         attributeFactory.getClass();

         this.classFile = classFile;

         this.in = new DataInputStream(new BufferedInputStream(in));

         this.attributeFactory = attributeFactory;

     }

     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;

 }