Convert the Java-class-file-name to the equivalent Java-class-name (dot delimited package name). - Java Reflection

Java examples for Reflection:package

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Description

Convert the Java-class-file-name to the equivalent Java-class-name (dot delimited package name).

Demo Code

/*//from ww w  .jav a2s.c  om
   Milyn - Copyright (C) 2006 - 2010

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License (version 2.1) as published by the Free Software 
   Foundation.

   This library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  
            
   See the GNU Lesser General Public License for more details:    
   http://www.gnu.org/licenses/lgpl.txt
 */
//package com.java2s;

public class Main {
    public static void main(String[] argv) throws Exception {
        String fileName = "java2s.com";
        System.out.println(toClassName(fileName));
    }

    /**
     * Convert the Java-class-file-name to the equivalent Java-class-name (dot 
     * delimited package name).
     * <p/>
     * EG:<br/>
     * a/b/c/X.class converts to a.b.c.X<br/>
     * a/b/c/X converts to a.b.c.X<br/>
     * a.b.c.X converts to a.b.c.X<br/>
     * a.b.c.X.class converts to a.b.c.X<br/>
     * @param fileName The file name String to be translated.
     * @return Java Class runtime name representation of the supplied file name String.
     */
    public static String toClassName(String fileName) {
        StringBuffer className;

        if (fileName == null) {
            throw new IllegalArgumentException(
                    "null 'fileName' arg in method call.");
        }
        fileName = fileName.trim();
        if (fileName.equals("")) {
            throw new IllegalArgumentException(
                    "empty 'fileName' arg in method call.");
        }

        className = new StringBuffer(fileName);
        // Fixup the name - replace '/' with '.' and remove ".class" if
        // present.
        if (fileName.endsWith(".class") && fileName.length() > 6) {
            className.setLength(className.length() - 6);
        }
        for (int i = 0; i < className.length(); i++) {
            if (className.charAt(i) == '/') {
                className.setCharAt(i, '.');
            }
        }

        return className.toString();
    }
}

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