Mercurial > jdk8-mips64-public > langtools / file diff

     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	Wed Apr 27 01:34:52 2016 +0800
     1.3 @@ -0,0 +1,78 @@
     1.4 +/*
     1.5 + * Copyright (c) 2012, 2013, 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 +}