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package org.apache.catalina;
import javax.servlet.Filter;
import javax.servlet.Servlet;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import java.util.EventObject;
/**
* General event for notifying listeners of significant events related to
* a specific instance of a Servlet, or a specific instance of a Filter,
* as opposed to the Wrapper component that manages it.
*
* @author Craig R. McClanahan
* @version $Revision: 1.2 $ $Date: 2005/12/08 01:27:17 $
*/
public final class InstanceEvent
extends EventObject {
// ----------------------------------------------------- Manifest Constants
public enum EventType {
/**
* The event indicating that the init() method is about
* to be called for this instance.
*/
BEFORE_INIT_EVENT("beforeInit"),
/**
* The event indicating that the init() method has returned.
*/
AFTER_INIT_EVENT("afterInit"),
/**
* The event indicating that the service() method is about
* to be called on a servlet. The servlet property contains
* the servlet being called, and the request and
* response properties contain the current request and
* response being processed.
*/
BEFORE_SERVICE_EVENT("beforeService"),
/**
* The event indicating that the service() method has
* returned. The servlet property contains the servlet
* that was called, and the request and
* response properties contain the current request and
* response being processed.
*/
AFTER_SERVICE_EVENT("afterService"),
/**
* The event indicating that the destroy method is about
* to be called for this instance.
*/
BEFORE_DESTROY_EVENT("beforeDestroy"),
/**
* The event indicating that the destroy() method has
* returned.
*/
AFTER_DESTROY_EVENT("afterDestroy"),
/**
* The event indicating that the service() method of a
* servlet accessed via a request dispatcher is about to be called.
* The servlet property contains a reference to the
* dispatched-to servlet instance, and the request and
* response properties contain the current request and
* response being processed. The wrapper property will
* contain a reference to the dispatched-to Wrapper.
*/
BEFORE_DISPATCH_EVENT("beforeDispatch"),
/**
* The event indicating that the service() method of a
* servlet accessed via a request dispatcher has returned. The
* servlet property contains a reference to the
* dispatched-to servlet instance, and the request and
* response properties contain the current request and
* response being processed. The wrapper property will
* contain a reference to the dispatched-to Wrapper.
*/
AFTER_DISPATCH_EVENT("afterDispatch"),
/**
* The event indicating that the doFilter() method of a
* Filter is about to be called. The filter property
* contains a reference to the relevant filter instance, and the
* request and response properties contain
* the current request and response being processed.
*/
BEFORE_FILTER_EVENT("beforeFilter"),
/**
* The event indicating that the doFilter() method of a
* Filter has returned. The filter property contains
* a reference to the relevant filter instance, and the
* request and response properties contain
* the current request and response being processed.
*/
AFTER_FILTER_EVENT("afterFilter");
public final String value;
public final boolean isBefore;
EventType(String value) {
this.value = value;
isBefore = value.startsWith("before");
}
}
// ----------------------------------------------------------- Constructors
/**
* Construct a new InstanceEvent with the specified parameters. This
* constructor is used for filter lifecycle events.
*
* @param wrapper Wrapper managing this servlet instance
* @param filter Filter instance for which this event occurred
* @param type Event type (required)
*/
public InstanceEvent(Wrapper wrapper, Filter filter, EventType type) {
super(wrapper);
this.filter = filter;
this.servlet = null;
this.type = type;
}
/**
* Construct a new InstanceEvent with the specified parameters. This
* constructor is used for filter lifecycle events.
*
* @param wrapper Wrapper managing this servlet instance
* @param filter Filter instance for which this event occurred
* @param type Event type (required)
* @param exception Exception that occurred
*/
public InstanceEvent(Wrapper wrapper, Filter filter, EventType type,
Throwable exception) {
super(wrapper);
this.filter = filter;
this.servlet = null;
this.type = type;
this.exception = exception;
}
/**
* Construct a new InstanceEvent with the specified parameters. This
* constructor is used for filter processing events.
*
* @param wrapper Wrapper managing this servlet instance
* @param filter Filter instance for which this event occurred
* @param type Event type (required)
* @param request Servlet request we are processing
* @param response Servlet response we are processing
*/
public InstanceEvent(Wrapper wrapper, Filter filter, EventType type,
ServletRequest request, ServletResponse response) {
super(wrapper);
this.filter = filter;
this.servlet = null;
this.type = type;
this.request = request;
this.response = response;
}
/**
* Construct a new InstanceEvent with the specified parameters. This
* constructor is used for filter processing events.
*
* @param wrapper Wrapper managing this servlet instance
* @param filter Filter instance for which this event occurred
* @param type Event type (required)
* @param request Servlet request we are processing
* @param response Servlet response we are processing
* @param exception Exception that occurred
*/
public InstanceEvent(Wrapper wrapper, Filter filter, EventType type,
ServletRequest request, ServletResponse response,
Throwable exception) {
super(wrapper);
this.filter = filter;
this.servlet = null;
this.type = type;
this.request = request;
this.response = response;
this.exception = exception;
}
/**
* Construct a new InstanceEvent with the specified parameters. This
* constructor is used for processing servlet lifecycle events.
*
* @param wrapper Wrapper managing this servlet instance
* @param servlet Servlet instance for which this event occurred
* @param type Event type (required)
*/
public InstanceEvent(Wrapper wrapper, Servlet servlet, EventType type) {
super(wrapper);
this.filter = null;
this.servlet = servlet;
this.type = type;
}
/**
* Construct a new InstanceEvent with the specified parameters. This
* constructor is used for processing servlet lifecycle events.
*
* @param wrapper Wrapper managing this servlet instance
* @param servlet Servlet instance for which this event occurred
* @param type Event type (required)
* @param exception Exception that occurred
*/
public InstanceEvent(Wrapper wrapper, Servlet servlet, EventType type,
Throwable exception) {
super(wrapper);
this.filter = null;
this.servlet = servlet;
this.type = type;
this.exception = exception;
}
/**
* Construct a new InstanceEvent with the specified parameters. This
* constructor is used for processing servlet processing events.
*
* @param wrapper Wrapper managing this servlet instance
* @param servlet Servlet instance for which this event occurred
* @param type Event type (required)
* @param request Servlet request we are processing
* @param response Servlet response we are processing
*/
public InstanceEvent(Wrapper wrapper, Servlet servlet, EventType type,
ServletRequest request, ServletResponse response) {
super(wrapper);
this.filter = null;
this.servlet = servlet;
this.type = type;
this.request = request;
this.response = response;
}
/**
* Construct a new InstanceEvent with the specified parameters. This
* constructor is used for processing servlet processing events.
*
* @param wrapper Wrapper managing this servlet instance
* @param servlet Servlet instance for which this event occurred
* @param type Event type (required)
* @param request Servlet request we are processing
* @param response Servlet response we are processing
* @param exception Exception that occurred
*/
public InstanceEvent(Wrapper wrapper, Servlet servlet, EventType type,
ServletRequest request, ServletResponse response,
Throwable exception) {
super(wrapper);
this.filter = null;
this.servlet = servlet;
this.type = type;
this.request = request;
this.response = response;
this.exception = exception;
}
// ----------------------------------------------------- Instance Variables
/**
* The exception that was thrown during the processing being reported
* by this event (AFTER_INIT_EVENT, AFTER_SERVICE_EVENT,
* AFTER_DESTROY_EVENT, AFTER_DISPATCH_EVENT, and AFTER_FILTER_EVENT only).
*/
private Throwable exception = null;
/**
* The Filter instance for which this event occurred (BEFORE_FILTER_EVENT
* and AFTER_FILTER_EVENT only).
*/
private transient Filter filter = null;
/**
* The servlet request being processed (BEFORE_FILTER_EVENT,
* AFTER_FILTER_EVENT, BEFORE_SERVICE_EVENT, and AFTER_SERVICE_EVENT).
*/
private transient ServletRequest request = null;
/**
* The servlet response being processed (BEFORE_FILTER_EVENT,
* AFTER_FILTER_EVENT, BEFORE_SERVICE_EVENT, and AFTER_SERVICE_EVENT).
*/
private transient ServletResponse response = null;
/**
* The Servlet instance for which this event occurred (not present on
* BEFORE_FILTER_EVENT or AFTER_FILTER_EVENT events).
*/
private transient Servlet servlet = null;
/**
* The event type this instance represents.
*/
private EventType type = null;
// ------------------------------------------------------------- Properties
/**
* Return the exception that occurred during the processing
* that was reported by this event.
*/
public Throwable getException() {
return (this.exception);
}
/**
* Return the filter instance for which this event occurred.
*/
public Filter getFilter() {
return (this.filter);
}
/**
* Return the servlet request for which this event occurred.
*/
public ServletRequest getRequest() {
return (this.request);
}
/**
* Return the servlet response for which this event occurred.
*/
public ServletResponse getResponse() {
return (this.response);
}
/**
* Return the servlet instance for which this event occurred.
*/
public Servlet getServlet() {
return (this.servlet);
}
/**
* Return the event type of this event.
*/
public EventType getType() {
return (this.type);
}
/**
* Return the Wrapper managing the servlet instance for which this
* event occurred.
*/
public Wrapper getWrapper() {
return (Wrapper)getSource();
}
}