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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2012-2014 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * http://glassfish.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [year] [name of copyright owner]"
 *
 * Contributor(s):
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
 * only if the new code is made subject to such option by the copyright
 * holder.
 */
package org.glassfish.tyrus.core;

import java.io.IOException;
import java.io.OutputStream;
import java.nio.ByteBuffer;
import java.util.Arrays;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Future;

/**
 * Simple Writer that writes its data to
 * an async sink.
 *
 * @author Danny Coward (danny.coward at oracle.com)
 */
class OutputStreamToAsyncBinaryAdapter extends OutputStream {
    private final TyrusRemoteEndpoint re;

    public OutputStreamToAsyncBinaryAdapter(TyrusRemoteEndpoint re) {
        this.re = re;
    }

    @Override
    public void write(byte b[], int off, int len) throws IOException {
        if (b == null) {
            throw new NullPointerException();
        } else if ((off < 0) || (off > b.length) || (len < 0) ||
                ((off + len) > b.length) || ((off + len) < 0)) {
            throw new IndexOutOfBoundsException();
        } else if (len == 0) {
            return;
        }

        ByteBuffer result = ByteBuffer.allocate(len);
        result.put(Arrays.copyOfRange(b, off, len));
        result.flip();
        final Future future = re.sendBinary(result, false);
        try {
            future.get();
        } catch (InterruptedException e) {
            Thread.currentThread().interrupt();
        } catch (ExecutionException e) {
            if (e.getCause() instanceof IOException) {
                throw (IOException) e.getCause();
            } else {
                throw new IOException(e.getCause());
            }
        }
    }

    @Override
    public void write(int i) throws IOException {
        byte[] byteArray = new byte[]{(byte) i};

        write(byteArray, 0, byteArray.length);
    }

    @Override
    public void flush() throws IOException {
        // do nothing.
    }

    @Override
    public void close() throws IOException {
        re.sendBinary(ByteBuffer.wrap(new byte[]{}), true);
    }
}