Java String Substritute substituteEnvironmentVariables(String str, String prefix, String suffix)

Description

substitute Environment Variables

License

Open Source License

Declaration

public static String substituteEnvironmentVariables(String str, String prefix, String suffix) 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

public class Main {
    public static String substituteEnvironmentVariables(String str, String prefix, String suffix) {
        StringBuilder buffer = new StringBuilder(str);
        int prefixLength = prefix.length();
        int index = 0;
        while (index < buffer.length()) {
            index = buffer.indexOf(prefix, index);
            if (index < 0)
                break;
            index += prefixLength;//w  ww .  j  a v a2  s .c o m
            int startIndex = index;
            index = buffer.indexOf(suffix, index);
            if (index < 0)
                index = startIndex;
            else {
                String value = null;
                if (index > startIndex) {
                    try {
                        value = System.getenv(buffer.substring(startIndex, index));
                    } catch (SecurityException e) {
                        // ignore
                    }
                }
                startIndex -= prefixLength;
                if (value == null)
                    value = "";
                buffer.replace(startIndex, index + suffix.length(), value);
                index = startIndex + value.length();
            }
        }
        return buffer.toString();
    }
}

Related

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2. substitute(String txt, String pattern, String sub)
3. substituteAll(String regexp, String subst, String target)
4. substituteBlanks(String s, String subst)
5. substituteCommandLine(String[] parsedCommandLine, String file1Name, String file2Name, String display1, String display2)
6. substituteHex(String aString)
7. substituteInvalidChars(String str)
8. substituteJobID(String path)
9. substituteMarkers(String sql, String marker, Object substitution)