1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000 1.2 +++ b/src/share/classes/com/sun/tools/sjavac/comp/SmartWriter.java Mon Feb 04 18:08:53 2013 -0500 1.3 @@ -0,0 +1,78 @@ 1.4 +/* 1.5 + * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved. 1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 1.7 + * 1.8 + * This code is free software; you can redistribute it and/or modify it 1.9 + * under the terms of the GNU General Public License version 2 only, as 1.10 + * published by the Free Software Foundation. Oracle designates this 1.11 + * particular file as subject to the "Classpath" exception as provided 1.12 + * by Oracle in the LICENSE file that accompanied this code. 1.13 + * 1.14 + * This code is distributed in the hope that it will be useful, but WITHOUT 1.15 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 1.16 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 1.17 + * version 2 for more details (a copy is included in the LICENSE file that 1.18 + * accompanied this code). 1.19 + * 1.20 + * You should have received a copy of the GNU General Public License version 1.21 + * 2 along with this work; if not, write to the Free Software Foundation, 1.22 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 1.23 + * 1.24 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 1.25 + * or visit www.oracle.com if you need additional information or have any 1.26 + * questions. 1.27 + */ 1.28 +package com.sun.tools.sjavac.comp; 1.29 + 1.30 +import java.io.*; 1.31 +import javax.tools.JavaFileObject; 1.32 + 1.33 +/** 1.34 + * The SmartWriter will cache the written data and when the writer is closed, 1.35 + * then it will compare the cached data with the old_content string. 1.36 + * If different, then it will write all the new content to the file. 1.37 + * If not, the file is not touched. 1.38 + * 1.39 + * <p><b>This is NOT part of any supported API. 1.40 + * If you write code that depends on this, you do so at your own 1.41 + * risk. This code and its internal interfaces are subject to change 1.42 + * or deletion without notice.</b></p> 1.43 + */ 1.44 +public class SmartWriter extends Writer { 1.45 + 1.46 + String name; 1.47 + JavaFileObject file; 1.48 + String oldContent; 1.49 + StringWriter newContent = new StringWriter(); 1.50 + PrintWriter stdout; 1.51 + boolean closed; 1.52 + public SmartWriter(JavaFileObject f, String s, String n, PrintWriter pw) { 1.53 + name = n; 1.54 + file = f; 1.55 + oldContent = s; 1.56 + newContent = new StringWriter(); 1.57 + stdout = pw; 1.58 + closed = false; 1.59 + } 1.60 + 1.61 + public void write(char[] chars, int i, int i1) 1.62 + { 1.63 + newContent.write(chars, i, i1); 1.64 + } 1.65 + 1.66 + public void close() throws IOException { 1.67 + if (closed) return; 1.68 + closed = true; 1.69 + String s = newContent.toString(); 1.70 + if (!oldContent.equals(s)) { 1.71 + int p = file.getName().lastIndexOf(File.separatorChar); 1.72 + try (Writer writer = file.openWriter()) { 1.73 + writer.write(s); 1.74 + } 1.75 + stdout.println("Writing "+file.getName().substring(p+1)); 1.76 + } 1.77 + } 1.78 + 1.79 + public void flush() throws IOException { 1.80 + } 1.81 +}