Java Folder Read getFileSystemProperty(String name)

Description

get File System Property

License

Apache License

Declaration

public static File getFileSystemProperty(String name) 

Method Source Code

//package com.java2s;
//License from project: Apache License 

import java.io.File;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Main {
    private static final Pattern VAR_PTN = Pattern.compile("\\$\\{([^\\}]+)\\}");

    public static File getFileSystemProperty(String name) {
        return getFileSystemProperty(name, null);
    }/*  ww  w.j  a  v a  2s.  c  o m*/

    public static File getFileSystemProperty(String name, File defaultFile) {
        String fileStr = replace(System.getProperty(name));
        if (fileStr != null)
            return new File(fileStr);
        else
            return defaultFile;
    }

    private static String replace(String value) {
        if (value == null)
            return null;
        StringBuffer sb = new StringBuffer(256);
        Matcher m = VAR_PTN.matcher(value);
        while (m.find()) {
            String propValue = System.getProperty(m.group(1));
            if (propValue == null)
                propValue = "";
            m.appendReplacement(sb, Matcher.quoteReplacement(propValue));
        }
        m.appendTail(sb);
        return sb.toString();
    }
}

Related

1. getFileString(File file)
2. getFileString(String filePath)
3. getFileStringContent(String filename)
4. GetFilesWithChildren(File root, ArrayList files)
5. getFileSystemProperties(String path)