src/jdk.compiler/share/classes/com/sun/tools/sjavac/AutoFlushWriter.java

/*
 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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package com.sun.tools.sjavac;

import java.io.FilterWriter;
import java.io.IOException;
import java.io.Writer;

public class AutoFlushWriter extends FilterWriter {

    public AutoFlushWriter(Writer out) {
        super(out);
    }

    @Override
    public void write(int c) throws IOException {
        super.write(c);
        if (c == '\n' || c == '\r')
            flush();
    }

    @Override
    public void write(String str, int off, int len) throws IOException {
        super.write(str, off, len);
        if (str.contains("\n") || str.contains("\r"))
            flush();
    }

    @Override
    public void write(char[] cbuf, int off, int len) throws IOException {
        super.write(cbuf, off, len);
        for (char c : cbuf) {
            if (c == '\n' || c == '\r') {
                flush();
                break;
            }
        }
    }
}