Mercurial > jdk8-mips64-public > langtools / file comparison
comparison: src/share/classes/com/sun/tools/sjavac/comp/SmartWriter.java
src/share/classes/com/sun/tools/sjavac/comp/SmartWriter.java
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- 2eb010b6cb22
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| 1 /* | |
| 2 * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved. | |
| 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. Oracle designates this | |
| 8 * particular file as subject to the "Classpath" exception as provided | |
| 9 * by Oracle in the LICENSE file that accompanied this code. | |
| 10 * | |
| 11 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 14 * version 2 for more details (a copy is included in the LICENSE file that | |
| 15 * accompanied this code). | |
| 16 * | |
| 17 * You should have received a copy of the GNU General Public License version | |
| 18 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 20 * | |
| 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 22 * or visit www.oracle.com if you need additional information or have any | |
| 23 * questions. | |
| 24 */ | |
| 25 package com.sun.tools.sjavac.comp; | |
| 26 | |
| 27 import java.io.*; | |
| 28 import javax.tools.JavaFileObject; | |
| 29 | |
| 30 /** | |
| 31 * The SmartWriter will cache the written data and when the writer is closed, | |
| 32 * then it will compare the cached data with the old_content string. | |
| 33 * If different, then it will write all the new content to the file. | |
| 34 * If not, the file is not touched. | |
| 35 * | |
| 36 * <p><b>This is NOT part of any supported API. | |
| 37 * If you write code that depends on this, you do so at your own | |
| 38 * risk. This code and its internal interfaces are subject to change | |
| 39 * or deletion without notice.</b></p> | |
| 40 */ | |
| 41 public class SmartWriter extends Writer { | |
| 42 | |
| 43 String name; | |
| 44 JavaFileObject file; | |
| 45 String oldContent; | |
| 46 StringWriter newContent = new StringWriter(); | |
| 47 PrintWriter stdout; | |
| 48 boolean closed; | |
| 49 public SmartWriter(JavaFileObject f, String s, String n, PrintWriter pw) { | |
| 50 name = n; | |
| 51 file = f; | |
| 52 oldContent = s; | |
| 53 newContent = new StringWriter(); | |
| 54 stdout = pw; | |
| 55 closed = false; | |
| 56 } | |
| 57 | |
| 58 public void write(char[] chars, int i, int i1) | |
| 59 { | |
| 60 newContent.write(chars, i, i1); | |
| 61 } | |
| 62 | |
| 63 public void close() throws IOException { | |
| 64 if (closed) return; | |
| 65 closed = true; | |
| 66 String s = newContent.toString(); | |
| 67 if (!oldContent.equals(s)) { | |
| 68 int p = file.getName().lastIndexOf(File.separatorChar); | |
| 69 try (Writer writer = file.openWriter()) { | |
| 70 writer.write(s); | |
| 71 } | |
| 72 stdout.println("Writing "+file.getName().substring(p+1)); | |
| 73 } | |
| 74 } | |
| 75 | |
| 76 public void flush() throws IOException { | |
| 77 } | |
| 78 } |
