shell.remote/src/main/java/org/apache/felix/shell/remote/TerminalPrintStream.java

/*
 * 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.felix.shell.remote;

import java.io.OutputStream;
import java.io.PrintStream;

/**
 * Class implementing a <tt>TerminalPrintStream</tt>.
 */
class TerminalPrintStream extends PrintStream
{
    private final ServiceMediator m_services;
    private volatile boolean m_isClosed = false;

    /**
     * Constructs a new instance wrapping the given <tt>OutputStream</tt>.
     *
     * @param tout the <tt>OutputStream</tt> to be wrapped.
     */
    public TerminalPrintStream(ServiceMediator services, OutputStream tout)
    {
        super(tout);
        m_services = services;
    }

    public void print(String str)
    {
        if (out != null)
        {
            try
            {
                byte[] bytes = str.getBytes();
                out.write(bytes, 0, bytes.length);
                flush();
            }
            catch (Exception ex)
            {
                if (!m_isClosed)
                {
                    m_services.error("TerminalPrintStream::print()", ex);
                }
            }
        }
    }

    public void println(String str)
    {
        print(str + "\r\n");
    }

    public void flush()
    {
        if (out != null)
        {
            try
            {
                out.flush();
            }
            catch (Exception ex)
            {
                if (!m_isClosed)
                {
                    m_services.error("TerminalPrintStream::println()", ex);
                }
            }
        }
    }

    public void close()
    {
        m_isClosed = true;
        super.close();
    }
}