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package javax.servlet;

import java.util.Map;
import java.util.Set;

/**
 * Interface through which a {@link Servlet} or {@link Filter} may be
 * further configured.
 *
 * 

A Registration object whose {@link #getClassName} method returns null * is considered preliminary. Servlets and Filters whose implementation * class is container implementation specific may be declared without * any servlet-class or filter-class elements, respectively, * and will be represented as preliminary Registration objects. * Preliminary registrations must be completed by calling one of the * addServlet or addFilter methods on * {@link ServletContext}, and passing in the Servlet or Filter name * (obtained via {@link #getName}) along with the supporting Servlet or Filter * implementation class name, Class object, or instance, respectively. * In most cases, preliminary registrations will be completed by an * appropriate, container-provided {@link ServletContainerInitializer}. * * @since Servlet 3.0 */ public interface Registration { /** * Gets the name of the Servlet or Filter that is represented by this * Registration. * * @return the name of the Servlet or Filter that is represented by this * Registration */ public String getName(); /** * Gets the fully qualified class name of the Servlet or Filter that * is represented by this Registration. * * @return the fully qualified class name of the Servlet or Filter * that is represented by this Registration, or null if this * Registration is preliminary */ public String getClassName(); /** * Sets the initialization parameter with the given name and value * on the Servlet or Filter that is represented by this Registration. * * @param name the initialization parameter name * @param value the initialization parameter value * * @return true if the update was successful, i.e., an initialization * parameter with the given name did not already exist for the Servlet * or Filter represented by this Registration, and false otherwise * * @throws IllegalStateException if the ServletContext from which this * Registration was obtained has already been initialized * @throws IllegalArgumentException if the given name or value is * null */ public boolean setInitParameter(String name, String value); /** * Gets the value of the initialization parameter with the given name * that will be used to initialize the Servlet or Filter represented * by this Registration object. * * @param name the name of the initialization parameter whose value is * requested * * @return the value of the initialization parameter with the given * name, or null if no initialization parameter with the given * name exists */ public String getInitParameter(String name); /** * Sets the given initialization parameters on the Servlet or Filter * that is represented by this Registration. * *

The given map of initialization parameters is processed * by-value, i.e., for each initialization parameter contained * in the map, this method calls {@link #setInitParameter(String,String)}. * If that method would return false for any of the * initialization parameters in the given map, no updates will be * performed, and false will be returned. Likewise, if the map contains * an initialization parameter with a null name or value, no * updates will be performed, and an IllegalArgumentException will be * thrown. * * @param initParameters the initialization parameters * * @return the (possibly empty) Set of initialization parameter names * that are in conflict * * @throws IllegalStateException if the ServletContext from which this * Registration was obtained has already been initialized * @throws IllegalArgumentException if the given map contains an * initialization parameter with a null name or value */ public Set setInitParameters(Map initParameters); /** * Gets an immutable (and possibly empty) Map containing the * currently available initialization parameters that will be used to * initialize the Servlet or Filter represented by this Registration * object. * * @return Map containing the currently available initialization * parameters that will be used to initialize the Servlet or Filter * represented by this Registration object */ public Map getInitParameters(); /** * Interface through which a {@link Servlet} or {@link Filter} registered * via one of the addServlet or addFilter methods, * respectively, on {@link ServletContext} may be further configured. */ interface Dynamic extends Registration { /** * Configures the Servlet or Filter represented by this dynamic * Registration as supporting asynchronous operations or not. * *

By default, servlet and filters do not support asynchronous * operations. * *

A call to this method overrides any previous setting. * * @param isAsyncSupported true if the Servlet or Filter represented * by this dynamic Registration supports asynchronous operations, * false otherwise * * @throws IllegalStateException if the ServletContext from which * this dynamic Registration was obtained has already been * initialized */ public void setAsyncSupported(boolean isAsyncSupported); } }





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