Javassist是一个开源的分析、编辑和创建Java字节码的类库。是由东京技术学院的数学和计算机科学系的 Shigeru Chiba 所创建的。它已加入了开放源代码JBoss 应用服务器项目,通过使

				/*				 * Javassist, a Java-bytecode translator toolkit.				 * Copyright (C) 1999-2006 Shigeru Chiba. All Rights Reserved.				 *				 * The contents of this file are subject to the Mozilla Public License Version				 * 1.1 (the "License"); you may not use this file except in compliance with				 * the License.  Alternatively, the contents of this file may be used under				 * the terms of the GNU Lesser General Public License Version 2.1 or later.				 *				 * Software distributed under the License is distributed on an "AS IS" basis,				 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License				 * for the specific language governing rights and limitations under the				 * License.				 */								package javassist.bytecode;								import java.io.DataInputStream;				import java.io.IOException;				import java.util.Map;								/**				 * SourceFile_attribute.				 */				public class SourceFileAttribute extends AttributeInfo {				    /**				     * The name of this attribute "SourceFile".				     */				    public static final String tag = "SourceFile";								    SourceFileAttribute(ConstPool cp, int n, DataInputStream in)				        throws IOException				    {				        super(cp, n, in);				    }								    /**				     * Constructs a SourceFile attribute.				     *				     * @param cp                a constant pool table.				     * @param filename          the name of the source file.				     */				    public SourceFileAttribute(ConstPool cp, String filename) {				        super(cp, tag);				        int index = cp.addUtf8Info(filename);				        byte[] bvalue = new byte[2];				        bvalue[0] = (byte)(index >>> 8);				        bvalue[1] = (byte)index;				        set(bvalue);				    }								    /**				     * Returns the file name indicated by sourcefile_index.				     */				    public String getFileName() {				        return getConstPool().getUtf8Info(ByteArray.readU16bit(get(), 0));				    }								    /**				     * Makes a copy.  Class names are replaced according to the				     * given Map object.				     *				     * @param newCp     the constant pool table used by the new copy.				     * @param classnames        pairs of replaced and substituted				     *                          class names.				     */				    public AttributeInfo copy(ConstPool newCp, Map classnames) {				        return new SourceFileAttribute(newCp, getFileName());				    }				}