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/*
 * Copyright (c) 2007, intarsys consulting GmbH
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * - Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 *
 * - Neither the name of intarsys nor the names of its contributors may be used
 *   to endorse or promote products derived from this software without specific
 *   prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
package de.intarsys.pdf.encoding;

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

/**
 * A writer that uses a PDF style encoding to map unicode to byte code.
 */
public class MappedWriter extends Writer {
	/** the encoding we use to encode the characters */
	private Encoding encoding;

	/** the byte stream we write on */
	private OutputStream outStream;

	/**
	 * Create a MappedWriter
	 * 
	 * @param out
	 *            The underlying output byte stream.
	 * @param encoding
	 *            The encoding to use.
	 */
	public MappedWriter(OutputStream out, Encoding encoding) {
		super(out);
		setOutStream(out);
		setEncoding(encoding);
	}

	/**
	 * @see java.io.Writer#close()
	 */
	@Override
	public void close() throws IOException {
		synchronized (lock) {
			if (outStream == null) {
				return;
			}
			flush();
			outStream.close();
			outStream = null;
		}
	}

	/**
	 * Check to make sure that the stream has not been closed
	 * 
	 * @throws IOException
	 *             if the outStream is null.
	 */
	private void ensureOpen() throws IOException {
		if (outStream == null) {
			throw new IOException("Stream closed");
		}
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see java.io.Writer#flush()
	 */
	@Override
	public void flush() throws IOException {
		synchronized (lock) {
			outStream.flush();
		}
	}

	/**
	 * The encoding used by this writer.
	 * 
	 * @return The encoding used by this writer.
	 */
	public Encoding getEncoding() {
		return encoding;
	}

	/**
	 * The underlying output stream.
	 * 
	 * @return The underlying output stream.
	 */
	protected java.io.OutputStream getOutStream() {
		return outStream;
	}

	/**
	 * Set the encoding to be used by this writer.
	 * 
	 * @param encoding
	 *            THe new encoding to be used.
	 */
	private void setEncoding(Encoding encoding) {
		this.encoding = encoding;
	}

	private void setOutStream(java.io.OutputStream newOutStream) {
		outStream = newOutStream;
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see java.io.Writer#write(char[], int, int)
	 */
	@Override
	public void write(char[] cbuf, int off, int len) throws IOException {
		synchronized (lock) {
			ensureOpen();
			if ((off < 0) || (off > cbuf.length) || (len < 0)
					|| ((off + len) > cbuf.length) || ((off + len) < 0)) {
				throw new IndexOutOfBoundsException();
			} else if (len == 0) {
				return;
			}
			int stop = off + len;
			for (int i = off; i < stop; i++) {
				encoding.putNextDecoded(outStream, cbuf[i]);
			}
		}
	}
}