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package com.sun.faces.test.servlet30.flash;
import java.util.Map;
import javax.annotation.PreDestroy;
import javax.faces.application.Application;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;
import javax.faces.context.FacesContext;
import javax.faces.event.AbortProcessingException;
import javax.faces.event.PostKeepFlashValueEvent;
import javax.faces.event.PostPutFlashValueEvent;
import javax.faces.event.PreClearFlashEvent;
import javax.faces.event.PreRemoveFlashValueEvent;
import javax.faces.event.SystemEvent;
import javax.faces.event.SystemEventListener;
import java.io.Serializable;
@ManagedBean
@SessionScoped
public class SessionScopedBean implements Serializable {
private FlashListener listener;
public SessionScopedBean() {
FacesContext context = FacesContext.getCurrentInstance();
Application app = context.getApplication();
listener = new FlashListener();
app.subscribeToEvent(PreRemoveFlashValueEvent.class, listener);
app.subscribeToEvent(PostKeepFlashValueEvent.class, listener);
app.subscribeToEvent(PreClearFlashEvent.class, listener);
app.subscribeToEvent(PostPutFlashValueEvent.class, listener);
}
@PreDestroy
public void destroy() {
FacesContext context = FacesContext.getCurrentInstance();
Application app = context.getApplication();
app.unsubscribeFromEvent(PreRemoveFlashValueEvent.class, listener);
app.unsubscribeFromEvent(PostKeepFlashValueEvent.class, listener);
app.unsubscribeFromEvent(PreClearFlashEvent.class, listener);
app.unsubscribeFromEvent(PostPutFlashValueEvent.class, listener);
}
public String getMessage() {
FacesContext context = FacesContext.getCurrentInstance();
Map<String, Object> sessionMap = context.getExternalContext().getSessionMap();
String result = (sessionMap.containsKey("builder")) ? ((StringBuilder) sessionMap.get("builder")).toString() : "no message";
return result;
}
public static class FlashListener implements SystemEventListener {
public boolean isListenerForSource(Object source) {
return ((source instanceof String) || (source instanceof Map));
}
public void processEvent(SystemEvent event) throws AbortProcessingException {
appendMessage("[received " + event.getClass().getName() + " source:"
+ event.getSource() + "]");
}
private void appendMessage(String message) {
FacesContext context = FacesContext.getCurrentInstance();
Map<String, Object> sessionMap = context.getExternalContext().getSessionMap();
StringBuilder builder;
builder = (StringBuilder) sessionMap.get("builder");
if (null == builder) {
builder = new StringBuilder();
sessionMap.put("builder", builder);
}
builder.append(message);
}
}
}