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package javax.servlet;

import java.util.Enumeration;

/** 
 * A filter configuration object used by a servlet container
 * to pass information to a filter during initialization.
 *
 * @see Filter 
 * @since Servlet 2.3
 */
public interface FilterConfig {

    /** 
     * Returns the filter-name of this filter as defined in the deployment
     * descriptor. 
     */
    public String getFilterName();


    /**
     * Returns a reference to the {@link ServletContext} in which the caller
     * is executing.
     *
     * @return a {@link ServletContext} object, used by the caller to
     * interact with its servlet container
     * 
     * @see ServletContext
     */
    public ServletContext getServletContext();
    

    /**
     * Returns a String containing the value of the 
     * named initialization parameter, or null if 
     * the initialization parameter does not exist.
     *
     * @param name a String specifying the name of the
     * initialization parameter
     *
     * @return a String containing the value of the
     * initialization parameter, or null if 
     * the initialization parameter does not exist
     */
    public String getInitParameter(String name);


    /**
     * Returns the names of the filter's initialization parameters
     * as an Enumeration of String objects, 
     * or an empty Enumeration if the filter has
     * no initialization parameters.
     *
     * @return an Enumeration of String objects
     * containing the names of the filter's initialization parameters
     */
    public Enumeration getInitParameterNames();

}