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Scala example source code file (AnsiWindowsTerminal.java)

This example Scala source code file (AnsiWindowsTerminal.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Scala tags/keywords

ansioutputstream, ansiwindowsterminal, ansiwindowsterminal, exception, exception, io, outputstream, outputstream, override, override, string, throwable, windows, windowsansioutputstream, windowsterminal

The Scala AnsiWindowsTerminal.java source code

/*
 * Copyright (C) 2009 the original author(s).
 *
 * Licensed 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.
 *
 * MODIFICATIONS: methods to deal with wrapping the output stream.
 */

package scala.tools.jline;

import org.fusesource.jansi.AnsiConsole;
import org.fusesource.jansi.AnsiOutputStream;
import org.fusesource.jansi.WindowsAnsiOutputStream;

import java.io.ByteArrayOutputStream;
import java.io.OutputStream;

/**
 * ANSI-supported {@link WindowsTerminal}.
 *
 * @since 2.0
 */
public class AnsiWindowsTerminal
    extends WindowsTerminal
{
    private final boolean ansiSupported = detectAnsiSupport();

    @Override
    public OutputStream wrapOutIfNeeded(OutputStream out) {
        return wrapOutputStream(out);
    }

    /**
     * Returns an ansi output stream handler. We return whatever was
     * passed if we determine we cannot handle ansi based on Kernel32 calls.
     * 
     * @return an @{link AltWindowAnsiOutputStream} instance or the passed 
     * stream.
     */
    private static OutputStream wrapOutputStream(final OutputStream stream) {
        String os = System.getProperty("os.name");
        if( os.startsWith("Windows") ) {
            // On windows we know the console does not interpret ANSI codes..
            try {
                return new WindowsAnsiOutputStream(stream);
            } catch (Throwable ignore) {
                // this happens when JNA is not in the path.. or
                // this happens when the stdout is being redirected to a file.
            }
            // Use the ANSIOutputStream to strip out the ANSI escape sequences.
            return new AnsiOutputStream(stream);
        }
        return stream;
    }

    private static boolean detectAnsiSupport() {
        OutputStream out = AnsiConsole.wrapOutputStream(new ByteArrayOutputStream());
        try {
            out.close();
        }
        catch (Exception e) {
            // ignore;
        }
        return out instanceof WindowsAnsiOutputStream;
    }

    public AnsiWindowsTerminal() throws Exception {
        super();
    }

    @Override
    public boolean isAnsiSupported() {
        return ansiSupported;
    }

    @Override
    public boolean hasWeirdWrap() {
        return false;
    }
}

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