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/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied. See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.cxf.transport.udp;

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

import org.apache.mina.core.buffer.IoBuffer;
import org.apache.mina.core.future.WriteFuture;
import org.apache.mina.core.session.IoSession;

class IoSessionOutputStream extends OutputStream {
    private final IoSession session;

    private WriteFuture lastWriteFuture;

    public IoSessionOutputStream(IoSession session) {
        this.session = session;
    }

    @Override
    public void close() throws IOException {
        try {
            flush();
        } finally {
            session.close(true).awaitUninterruptibly();
        }
    }

    private void checkClosed() throws IOException {
        if (!session.isConnected()) {
            throw new IOException("The session has been closed.");
        }
    }

    private synchronized void write(IoBuffer buf) throws IOException {
        checkClosed();
        WriteFuture future = session.write(buf);
        lastWriteFuture = future;
    }

    @Override
    public void write(byte[] b, int off, int len) throws IOException {
        write(IoBuffer.wrap(b.clone(), off, len));
    }

    @Override
    public void write(int b) throws IOException {
        IoBuffer buf = IoBuffer.allocate(1);
        buf.put((byte) b);
        buf.flip();
        write(buf);
    }

    @Override
    public synchronized void flush() throws IOException {
        if (lastWriteFuture == null) {
            return;
        }

        lastWriteFuture.awaitUninterruptibly();
        if (!lastWriteFuture.isWritten()) {
            throw new IOException(
                    "The bytes could not be written to the session");
        }
    }
}