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package javax.el;

/**
 * The interface to a map between EL function names and methods.
 *
 * A FunctionMapper maps ${prefix:name()} 
 * style functions to a static method that can execute that function.
 *
 * @since JSP 2.1
 */
public abstract class FunctionMapper {
    
  /**
   * Resolves the specified prefix and local name into a 
   * java.lang.Method.
   *
   * Returns null if no function could be found that matches
   * the given prefix and local name.
   * 
   * @param prefix the prefix of the function, or "" if no prefix.
   *     For example, "fn" in ${fn:method()}, or
   *     "" in ${method()}.
   * @param localName the short name of the function. For example,
   *     "method" in ${fn:method()}.
   * @return the static method to invoke, or null if no
   *     match was found.
   */
  public abstract java.lang.reflect.Method resolveFunction(String prefix, 
      String localName);
  
}