Java String Substitute stringSubstitution(String argStr, Hashtable vars)

Description

string Substitution

License

Open Source License

Declaration

public static String stringSubstitution(String argStr, Hashtable vars) 

Method Source Code

//package com.java2s;
/*/*from   w  ww .j a v a 2s. c o  m*/
** Tim Endres' utilities package.
** Copyright (c) 1997 by Tim Endres
** 
** This program is free software.
** 
** You may redistribute it and/or modify it under the terms of the GNU
** General Public License as published by the Free Software Foundation.
** Version 2 of the license should be included with this distribution in
** the file LICENSE, as well as License.html. If the license is not
** included   with this distribution, you may find a copy at the FSF web
** site at 'www.gnu.org' or 'www.fsf.org', or you may write to the
** Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139 USA.
**
** THIS SOFTWARE IS PROVIDED AS-IS WITHOUT WARRANTY OF ANY KIND,
** NOT EVEN THE IMPLIED WARRANTY OF MERCHANTABILITY. THE AUTHOR
** OF THIS SOFTWARE, ASSUMES _NO_ RESPONSIBILITY FOR ANY
** CONSEQUENCE RESULTING FROM THE USE, MODIFICATION, OR
** REDISTRIBUTION OF THIS SOFTWARE. 
** 
*/

import java.util.*;

public class Main {
    public static String stringSubstitution(String argStr, Hashtable vars) {
        StringBuffer argBuf = new StringBuffer();

        for (int cIdx = 0; cIdx < argStr.length();) {
            char ch = argStr.charAt(cIdx);

            switch (ch) {
            case '$':
                StringBuffer nameBuf = new StringBuffer();
                for (++cIdx; cIdx < argStr.length(); ++cIdx) {
                    ch = argStr.charAt(cIdx);
                    if (ch == '_' || Character.isLetterOrDigit(ch))
                        nameBuf.append(ch);
                    else
                        break;
                }

                if (nameBuf.length() > 0) {
                    String value = (String) vars.get(nameBuf.toString());

                    if (value != null) {
                        argBuf.append(value);
                    }
                }
                break;

            default:
                argBuf.append(ch);
                ++cIdx;
                break;
            }
        }

        return argBuf.toString();
    }
}

Related

1. substitute(String original, String match, String subst)
2. substitute(String str, Hashtable vars, String delimiter)
3. substituteProperty(String value, Properties coreProperties)