79 lines
2.7 KiB
Java
79 lines
2.7 KiB
Java
/*
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* Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package com.sun.tools.sjavac.comp;
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import java.io.*;
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import javax.tools.JavaFileObject;
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/**
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* The SmartWriter will cache the written data and when the writer is closed,
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* then it will compare the cached data with the old_content string.
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* If different, then it will write all the new content to the file.
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* If not, the file is not touched.
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*
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* <p><b>This is NOT part of any supported API.
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* If you write code that depends on this, you do so at your own
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* risk. This code and its internal interfaces are subject to change
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* or deletion without notice.</b></p>
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*/
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public class SmartWriter extends Writer {
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String name;
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JavaFileObject file;
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String oldContent;
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StringWriter newContent = new StringWriter();
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PrintWriter stdout;
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boolean closed;
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public SmartWriter(JavaFileObject f, String s, String n, PrintWriter pw) {
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name = n;
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file = f;
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oldContent = s;
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newContent = new StringWriter();
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stdout = pw;
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closed = false;
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}
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public void write(char[] chars, int i, int i1)
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{
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newContent.write(chars, i, i1);
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}
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public void close() throws IOException {
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if (closed) return;
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closed = true;
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String s = newContent.toString();
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if (!oldContent.equals(s)) {
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int p = file.getName().lastIndexOf(File.separatorChar);
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try (Writer writer = file.openWriter()) {
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writer.write(s);
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}
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stdout.println("Writing "+file.getName().substring(p+1));
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}
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}
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public void flush() throws IOException {
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}
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}
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