/structured-http-headers/shh-user-agent/src/main/java/com/mattunderscore/http/headers/useragent/parser/OSParser.java

/* Copyright © 2013 Matthew Champion
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright
      notice, this list of conditions and the following disclaimer in the
      documentation and/or other materials provided with the distribution.
    * Neither the name of mattunderscore.com nor the
      names of its contributors may be used to endorse or promote products
      derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL MATTHEW CHAMPION BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */

package com.mattunderscore.http.headers.useragent.parser;

import static com.mattunderscore.http.headers.useragent.parser.ParsingUtils.*;

import com.mattunderscore.http.headers.useragent.details.platform.Linux;
import com.mattunderscore.http.headers.useragent.details.platform.MacOSX;
import com.mattunderscore.http.headers.useragent.details.platform.Machintosh;
import com.mattunderscore.http.headers.useragent.details.platform.OSPlatform;
import com.mattunderscore.http.headers.useragent.details.platform.Windows;

/**
 * Parser for operating systems.
 * @author Matt Champion
 * @since 0.2.7
 */
/*package*/ class OSParser implements TokenParser
{
    private static final ArchitectureParser archParser = new ArchitectureParser();

    /*package*/ OSParser()
    {
    }

    /**
     * Parses the next token for a operating system.
     * @param state
     */
    @Override
    public String parseToken(ParsingState state)
    {
        String remainingHeader = state.getRemaining();
        if (remainingHeader.startsWith("Machintosh"))
        {
            state.addDetail(new Machintosh());
            remainingHeader = remainingHeader.substring(10);
        }
        else if (remainingHeader.startsWith("Windows NT"))
        {
            String version = nextElement(remainingHeader.substring(11));
            state.addDetail(new Windows("Windows NT",version));
            remainingHeader = remainingHeader.substring(11 + version.length());
        }
        else if (remainingHeader.startsWith("WinNT"))
        {
            String version = nextElement(remainingHeader.substring(6));
            state.addDetail(new Windows("Windows NT",version));
            remainingHeader = remainingHeader.substring(6 + version.length());
        }
        else if (remainingHeader.startsWith("Win95"))
        {
            state.addDetail(new OSPlatform("Windows 95"));
            remainingHeader = remainingHeader.substring(5);
        }
        else if (remainingHeader.startsWith("Windows 95"))
        {
            state.addDetail(new OSPlatform("Windows 95"));
            remainingHeader = remainingHeader.substring(10);
        }
        else if (remainingHeader.startsWith("Win98"))
        {
            state.addDetail(new OSPlatform("Windows 98"));
            remainingHeader = remainingHeader.substring(10);
        }
        else if (remainingHeader.startsWith("Windows 98; Win 9x 4.90"))
        {
            state.addDetail(new Windows("Windows 98","","Windows Millennium Edition (Windows Me)"));
            remainingHeader = remainingHeader.substring(23);
        }
        else if (remainingHeader.startsWith("Windows 98"))
        {
            state.addDetail(new OSPlatform("Windows 98"));
            remainingHeader = remainingHeader.substring(10);
        }
        else if (remainingHeader.startsWith("like Mac OS X"))
        {
            state.addDetail(new MacOSX("like"));
            remainingHeader = remainingHeader.substring(13);
        }
        else if (remainingHeader.startsWith("Mac OS X"))
        {
            String version = nextElement(remainingHeader.substring(9));
            state.addDetail(new MacOSX(version));
            remainingHeader = remainingHeader.substring(9 + version.length());
        }
        else if (remainingHeader.startsWith("Linux"))
        {
            remainingHeader = remainingHeader.substring(6);
            state.setRemaining(remainingHeader);
            String arch = archParser.parseToken(state);
            if (arch != null)
            {
                state.addDetail(new Linux(arch));
            }
            else
            {
                state.addDetail(new Linux());
            }
            remainingHeader = state.getRemaining();
        }
        state.setRemaining(remainingHeader);
        return null;
    }
}