com.technofovea.packbsp.PackbspUtil.java Source code

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Here is the source code for com.technofovea.packbsp.PackbspUtil.java

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/**
 * Copyright (C) 2011 Darien Hager
 *
 * This code is part of the "PackBSP" project, and is licensed under
 * a Creative Commons Attribution-ShareAlike 3.0 Unported License. For
 * either a summary of conditions or the full legal text, please visit:
 *
 * http://creativecommons.org/licenses/by-sa/3.0/
 *
 * Permissions beyond the scope of this license may be available
 * at http://technofovea.com/ .
 */
package com.technofovea.packbsp;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import org.apache.commons.io.FilenameUtils;
import org.apache.commons.io.IOUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * Miscellaneous utility methods.
 * 
 * @author Darien Hager
 */
public class PackbspUtil {

    private static final Logger logger = LoggerFactory.getLogger(PackbspUtil.class);
    private final static String steamRegistryPath = "HKCU\\Software\\Valve\\Steam\\SteamPath";
    private final static String steamDefaultGuess = "c:\\program files\\valve\\steam\\";

    /**
     * Efficiently copies a given file, returning a temporary copy which will be
     * removed when execution finishes.
     * 
     * @param source Source file to copy.
     * @return The copied file.
     * @throws IOException
     */
    public static final File createTempCopy(File source) throws IOException {
        String ext = FilenameUtils.getExtension(source.getName());
        File dest = File.createTempFile("packbsp_temp_", "." + ext);
        dest.deleteOnExit();
        FileInputStream fis = new FileInputStream(source);
        FileOutputStream fos = new FileOutputStream(dest);
        IOUtils.copy(fis, fos);
        fis.close();
        fos.close();
        return dest;
    }

    /**
     * Attempts to guess the directory in which a user has installed Steam,
     * checking the Windows Registry.
     *
     * @return The directory where Steam is probably installed.
     */
    public static final File guessSteamDir() {

        /* 
         * Not efficient to create this over and over, but in this context we 
         * do not expect many repeat invocations, if at all.
         */
        WindowsRegistryChecker wrc = new WindowsRegistryChecker();

        String guess = null;
        try {
            guess = wrc.getKey(steamRegistryPath);
        } catch (IOException ex) {
            logger.error("Had an exception querying registry for Steam folder: {}", ex);
        }
        if (guess != null) {
            File f = new File(guess);
            if (f.exists()) {
                return (f);
            } else {
                logger.warn("Found Steam directory from registry, but file location does not exist: {}", guess);
            }
        } else {
            logger.warn("Registry querying for Steam directory did not succeed.");
        }
        return new File(steamDefaultGuess);

    }
}