Determine whether the supplied string represents a well-formed fully-qualified Java classname. : Identifier « Reflection « Java

1. Java
2. Reflection
3. Identifier

Determine whether the supplied string represents a well-formed fully-qualified Java classname.

  
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import java.text.CharacterIterator;
import java.text.StringCharacterIterator;


public class Utils {

  /**
   * Determine whether the supplied string represents a well-formed fully-qualified Java classname. This utility method enforces
   * no conventions (e.g., packages are all lowercase) nor checks whether the class is available on the classpath.
   * 
   * @param classname
   * @return true if the string is a fully-qualified class name
   */
  public static boolean isFullyQualifiedClassname( String classname ) {
      if (classname == null) return false;
      String[] parts = classname.split("[\\.]");
      if (parts.length == 0) return false;
      for (String part : parts) {
          CharacterIterator iter = new StringCharacterIterator(part);
          // Check first character (there should at least be one character for each part) ...
          char c = iter.first();
          if (c == CharacterIterator.DONE) return false;
          if (!Character.isJavaIdentifierStart(c) && !Character.isIdentifierIgnorable(c)) return false;
          c = iter.next();
          // Check the remaining characters, if there are any ...
          while (c != CharacterIterator.DONE) {
              if (!Character.isJavaIdentifierPart(c) && !Character.isIdentifierIgnorable(c)) return false;
              c = iter.next();
          }
      }
      return true;
  }

}

   
    
  

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