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1 /* |
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2 * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. Oracle designates this |
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8 * particular file as subject to the "Classpath" exception as provided |
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9 * by Oracle in the LICENSE file that accompanied this code. |
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10 * |
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11 * This code is distributed in the hope that it will be useful, but WITHOUT |
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12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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14 * version 2 for more details (a copy is included in the LICENSE file that |
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15 * accompanied this code). |
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16 * |
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17 * You should have received a copy of the GNU General Public License version |
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18 * 2 along with this work; if not, write to the Free Software Foundation, |
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19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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20 * |
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21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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22 * or visit www.oracle.com if you need additional information or have any |
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23 * questions. |
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24 */ |
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25 package com.sun.tools.sjavac.comp; |
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26 |
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27 import java.io.*; |
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28 import javax.tools.JavaFileObject; |
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29 |
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30 /** |
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31 * The SmartWriter will cache the written data and when the writer is closed, |
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32 * then it will compare the cached data with the old_content string. |
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33 * If different, then it will write all the new content to the file. |
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34 * If not, the file is not touched. |
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35 * |
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36 * <p><b>This is NOT part of any supported API. |
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37 * If you write code that depends on this, you do so at your own |
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38 * risk. This code and its internal interfaces are subject to change |
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39 * or deletion without notice.</b></p> |
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40 */ |
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41 public class SmartWriter extends Writer { |
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42 |
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43 String name; |
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44 JavaFileObject file; |
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45 String oldContent; |
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46 StringWriter newContent = new StringWriter(); |
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47 PrintWriter stdout; |
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48 boolean closed; |
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49 public SmartWriter(JavaFileObject f, String s, String n, PrintWriter pw) { |
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50 name = n; |
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51 file = f; |
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52 oldContent = s; |
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53 newContent = new StringWriter(); |
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54 stdout = pw; |
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55 closed = false; |
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56 } |
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57 |
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58 public void write(char[] chars, int i, int i1) |
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59 { |
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60 newContent.write(chars, i, i1); |
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61 } |
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62 |
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63 public void close() throws IOException { |
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64 if (closed) return; |
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65 closed = true; |
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66 String s = newContent.toString(); |
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67 if (!oldContent.equals(s)) { |
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68 int p = file.getName().lastIndexOf(File.separatorChar); |
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69 try (Writer writer = file.openWriter()) { |
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70 writer.write(s); |
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71 } |
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72 stdout.println("Writing "+file.getName().substring(p+1)); |
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73 } |
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74 } |
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75 |
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76 public void flush() throws IOException { |
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77 } |
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78 } |