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package org.apache.xmlrpc.webserver;

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

import javax.servlet.ServletOutputStream;


/** Default implementation of a servlet output stream.
 * Handles output of HTTP headers.
 */
class ServletOutputStreamImpl extends ServletOutputStream {
	private final OutputStream target;
	private final HttpServletResponseImpl res;
	private final byte[] buffer = new byte[HttpServletResponseImpl.BUFFER_SIZE];
	private int bufferOffset;
	private boolean closed;
	private boolean committed;

	ServletOutputStreamImpl(OutputStream pTarget, HttpServletResponseImpl pResponse) {
		target = pTarget;
		res = pResponse;
	}

	public void write(int b) throws IOException {
		if (closed) {
			throw new IOException("This output stream is already closed.");
		}
		if (bufferOffset == buffer.length) {
			flush();
		}
		buffer[bufferOffset++] = (byte) b;
	}

	public void write(byte[] pChars, int pOffset, int pLen) throws IOException {
		if (closed) {
			throw new IOException("This output stream is already closed.");
		}
		while (pLen-- > 0) {
			if (bufferOffset == buffer.length) {
				flush();
			}
			buffer[bufferOffset++] = pChars[pOffset++];
		}
	}

	private void flush(boolean pClosing) throws IOException {
		if (!committed) {
			committed = true;
			String headers = res.getHttpHeaders(pClosing ? new Integer(bufferOffset) : null);
			target.write(headers.getBytes("US-ASCII"));
		}
		if (bufferOffset > 0) {
			target.write(buffer, 0, bufferOffset);
			bufferOffset = 0;
		}
	}

	public void close() throws IOException {
		if (!closed) {
			flush(true);
			closed = true;
			target.close();
		}
	}

	public void flush() throws IOException {
		if (closed) {
			throw new IOException("This output stream is already closed.");
		}
		flush(false);
		target.flush();
	}

	void reset() {
		if (committed) {
			throw new IllegalStateException("The response is already committed. A reset cannot be performed.");
		}
	}

	boolean isCommitted() {
		return committed;
	}
}