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diff --git a/src/main/javassist/bytecode/SourceFileAttribute.java b/src/main/javassist/bytecode/SourceFileAttribute.java
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+/*
+ * This file is part of the Javassist toolkit.
+ *
+ * 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. You may obtain a copy of the License at
+ * either http://www.mozilla.org/MPL/.
+ *
+ * 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.
+ *
+ * The Original Code is Javassist.
+ *
+ * The Initial Developer of the Original Code is Shigeru Chiba. Portions
+ * created by Shigeru Chiba are Copyright (C) 1999-2003 Shigeru Chiba.
+ * All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * The development of this software is supported in part by the PRESTO
+ * program (Sakigake Kenkyu 21) of Japan Science and Technology Corporation.
+ */
+
+package javassist.bytecode;
+
+import java.io.DataInputStream;
+import java.io.IOException;
+import java.util.Map;
+
+/**
+ * <code>SourceFile_attribute</code>.
+ */
+public class SourceFileAttribute extends AttributeInfo {
+ /**
+ * The name of this attribute <code>"SourceFile"</code>.
+ */
+ 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 <code>sourcefile_index</code>.
+ */
+ public String getFileName() {
+ return getConstPool().getUtf8Info(ByteArray.readU16bit(get(), 0));
+ }
+
+ /**
+ * Makes a copy. Class names are replaced according to the
+ * given <code>Map</code> 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());
+ }
+}