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PlantUML is a component that allows to quickly write diagrams from text.
There is a newer version: 1.2024.8
// THIS FILE HAS BEEN GENERATED BY A PREPROCESSOR.
/* +=======================================================================
 * |
 * |      PlantUML : a free UML diagram generator
 * |
 * +=======================================================================
 *
 * (C) Copyright 2009-2024, Arnaud Roques
 *
 * Project Info:  https://plantuml.com
 *
 * If you like this project or if you find it useful, you can support us at:
 *
 * https://plantuml.com/patreon (only 1$ per month!)
 * https://plantuml.com/liberapay (only 1€ per month!)
 * https://plantuml.com/paypal
 *
 *
 * PlantUML is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * PlantUML 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 Lesser General Public
 * License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library.  If not, see .
 *
 * PlantUML can occasionally display sponsored or advertising messages. Those
 * messages are usually generated on welcome or error images and never on
 * functional diagrams.
 * See https://plantuml.com/professional if you want to remove them
 *
 * Images (whatever their format : PNG, SVG, EPS...) generated by running PlantUML
 * are owned by the author of their corresponding sources code (that is, their
 * textual description in PlantUML language). Those images are not covered by
 * this LGPL license.
 *
 * The generated images can then be used without any reference to the LGPL license.
 * It is not even necessary to stipulate that they have been generated with PlantUML,
 * although this will be appreciated by the PlantUML team.
 *
 * There is an exception : if the textual description in PlantUML language is also covered
 * by any license, then the generated images are logically covered
 * by the very same license.
 *
 * This is the IGY distribution (Install GraphViz by Yourself).
 * You have to install GraphViz and to setup the GRAPHVIZ_DOT environment variable
 * (see https://plantuml.com/graphviz-dot )
 *
 * Icons provided by OpenIconic :  https://useiconic.com/open
 * Archimate sprites provided by Archi :  http://www.archimatetool.com
 * Stdlib AWS provided by https://github.com/milo-minderbinder/AWS-PlantUML
 * Stdlib Icons provided https://github.com/tupadr3/plantuml-icon-font-sprites
 * ASCIIMathML (c) Peter Jipsen http://www.chapman.edu/~jipsen
 * ASCIIMathML (c) David Lippman http://www.pierce.ctc.edu/dlippman
 * CafeUndZopfli ported by Eugene Klyuchnikov https://github.com/eustas/CafeUndZopfli
 * Brotli (c) by the Brotli Authors https://github.com/google/brotli
 * Themes (c) by Brett Schwarz https://github.com/bschwarz/puml-themes
 * Twemoji (c) by Twitter at https://twemoji.twitter.com/
 *
 */
package net.sourceforge.plantuml.json;

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

/**
 * A lightweight writing buffer to reduce the amount of write operations to be
 * performed on the underlying writer. This implementation is not thread-safe.
 * It deliberately deviates from the contract of Writer. In particular, it does
 * not flush or close the wrapped writer nor does it ensure that the wrapped
 * writer is open.
 */
class WritingBuffer extends Writer {

	private final Writer writer;
	private final char[] buffer;
	private int fill = 0;

	WritingBuffer(Writer writer) {
		this(writer, 16);
	}

	WritingBuffer(Writer writer, int bufferSize) {
		this.writer = writer;
		buffer = new char[bufferSize];
	}

	@Override
	public void write(int c) throws IOException {
		if (fill > buffer.length - 1) {
			flush();
		}
		buffer[fill++] = (char) c;
	}

	@Override
	public void write(char[] cbuf, int off, int len) throws IOException {
		if (fill > buffer.length - len) {
			flush();
			if (len > buffer.length) {
				writer.write(cbuf, off, len);
				return;
			}
		}
		System.arraycopy(cbuf, off, buffer, fill, len);
		fill += len;
	}

	@Override
	public void write(String str, int off, int len) throws IOException {
		if (fill > buffer.length - len) {
			flush();
			if (len > buffer.length) {
				writer.write(str, off, len);
				return;
			}
		}
		str.getChars(off, off + len, buffer, fill);
		fill += len;
	}

	/**
	 * Flushes the internal buffer but does not flush the wrapped writer.
	 */
	@Override
	public void flush() throws IOException {
		writer.write(buffer, 0, fill);
		fill = 0;
	}

	/**
	 * Does not close or flush the wrapped writer.
	 */
	@Override
	public void close() throws IOException {
	}

}