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src/share/classes/com/sun/tools/sjavac/comp/SmartWriter.java@2eb010b6cb22 (annotated)

src/share/classes/com/sun/tools/sjavac/comp/SmartWriter.java

Thu, 31 Aug 2017 15:17:03 +0800

author

aoqi

date

Thu, 31 Aug 2017 15:17:03 +0800

changeset 2525

2eb010b6cb22

parent 2227

998b10c43157

parent 0

959103a6100f

permissions

-rw-r--r--

merge

aoqi@0	1	/*
aoqi@0	2	* Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
aoqi@0	3	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
aoqi@0	4	*
aoqi@0	5	* This code is free software; you can redistribute it and/or modify it
aoqi@0	6	* under the terms of the GNU General Public License version 2 only, as
aoqi@0	7	* published by the Free Software Foundation. Oracle designates this
aoqi@0	8	* particular file as subject to the "Classpath" exception as provided
aoqi@0	9	* by Oracle in the LICENSE file that accompanied this code.
aoqi@0	10	*
aoqi@0	11	* This code is distributed in the hope that it will be useful, but WITHOUT
aoqi@0	12	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
aoqi@0	13	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
aoqi@0	14	* version 2 for more details (a copy is included in the LICENSE file that
aoqi@0	15	* accompanied this code).
aoqi@0	16	*
aoqi@0	17	* You should have received a copy of the GNU General Public License version
aoqi@0	18	* 2 along with this work; if not, write to the Free Software Foundation,
aoqi@0	19	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
aoqi@0	20	*
aoqi@0	21	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
aoqi@0	22	* or visit www.oracle.com if you need additional information or have any
aoqi@0	23	* questions.
aoqi@0	24	*/
aoqi@0	25	package com.sun.tools.sjavac.comp;
aoqi@0	26
aoqi@0	27	import java.io.*;
aoqi@0	28	import javax.tools.JavaFileObject;
aoqi@0	29
aoqi@0	30	/**
aoqi@0	31	* The SmartWriter will cache the written data and when the writer is closed,
aoqi@0	32	* then it will compare the cached data with the old_content string.
aoqi@0	33	* If different, then it will write all the new content to the file.
aoqi@0	34	* If not, the file is not touched.
aoqi@0	35	*
aoqi@0	36	* <p><b>This is NOT part of any supported API.
aoqi@0	37	* If you write code that depends on this, you do so at your own
aoqi@0	38	* risk. This code and its internal interfaces are subject to change
aoqi@0	39	* or deletion without notice.</b></p>
aoqi@0	40	*/
aoqi@0	41	public class SmartWriter extends Writer {
aoqi@0	42
aoqi@0	43	String name;
aoqi@0	44	JavaFileObject file;
aoqi@0	45	String oldContent;
aoqi@0	46	StringWriter newContent = new StringWriter();
aoqi@0	47	PrintWriter stdout;
aoqi@0	48	boolean closed;
aoqi@0	49	public SmartWriter(JavaFileObject f, String s, String n, PrintWriter pw) {
aoqi@0	50	name = n;
aoqi@0	51	file = f;
aoqi@0	52	oldContent = s;
aoqi@0	53	newContent = new StringWriter();
aoqi@0	54	stdout = pw;
aoqi@0	55	closed = false;
aoqi@0	56	}
aoqi@0	57
aoqi@0	58	public void write(char[] chars, int i, int i1)
aoqi@0	59	{
aoqi@0	60	newContent.write(chars, i, i1);
aoqi@0	61	}
aoqi@0	62
aoqi@0	63	public void close() throws IOException {
aoqi@0	64	if (closed) return;
aoqi@0	65	closed = true;
aoqi@0	66	String s = newContent.toString();
aoqi@0	67	if (!oldContent.equals(s)) {
aoqi@0	68	int p = file.getName().lastIndexOf(File.separatorChar);
aoqi@0	69	try (Writer writer = file.openWriter()) {
aoqi@0	70	writer.write(s);
aoqi@0	71	}
aoqi@0	72	stdout.println("Writing "+file.getName().substring(p+1));
aoqi@0	73	}
aoqi@0	74	}
aoqi@0	75
aoqi@0	76	public void flush() throws IOException {
aoqi@0	77	}
aoqi@0	78	}