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package com.sun.faces.facelets.tag.jsf.core;
import com.sun.faces.application.view.FaceletViewHandlingStrategy;
import com.sun.faces.facelets.tag.TagHandlerImpl;
import com.sun.faces.facelets.tag.jsf.ComponentSupport;
import com.sun.faces.facelets.util.ReflectionUtil;
import javax.el.ValueExpression;
import javax.faces.component.UIComponent;
import javax.faces.component.UIViewRoot;
import javax.faces.context.FacesContext;
import javax.faces.event.AbortProcessingException;
import javax.faces.event.PhaseEvent;
import javax.faces.event.PhaseId;
import javax.faces.event.PhaseListener;
import javax.faces.view.facelets.*;
import java.io.IOException;
import java.io.Serializable;
import java.util.List;
public class PhaseListenerHandler extends TagHandlerImpl {
private final static class LazyPhaseListener implements PhaseListener,
Serializable {
private static final long serialVersionUID = -6496143057319213401L;
private final String type;
private final ValueExpression binding;
public LazyPhaseListener(String type, ValueExpression binding) {
this.type = type;
this.binding = binding;
}
private PhaseListener getInstance() {
PhaseListener instance = null;
FacesContext faces = FacesContext.getCurrentInstance();
if (faces == null) {
return null;
}
if (this.binding != null) {
instance = (PhaseListener) binding.getValue(faces
.getELContext());
}
if (instance == null && type != null) {
try {
instance = (PhaseListener) ReflectionUtil.forName(
this.type).newInstance();
} catch (Exception e) {
throw new AbortProcessingException(
"Couldn't Lazily instantiate PhaseListener", e);
}
if (this.binding != null) {
binding.setValue(faces.getELContext(), instance);
}
}
return instance;
}
public void afterPhase(PhaseEvent event) {
PhaseListener pl = this.getInstance();
if (pl != null) {
pl.afterPhase(event);
}
}
public void beforePhase(PhaseEvent event) {
PhaseListener pl = this.getInstance();
if (pl != null) {
pl.beforePhase(event);
}
}
public PhaseId getPhaseId() {
PhaseListener pl = this.getInstance();
return (pl != null) ? pl.getPhaseId() : PhaseId.ANY_PHASE;
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
LazyPhaseListener that = (LazyPhaseListener) o;
if (binding != null
? !binding.equals(that.binding)
: that.binding != null) {
return false;
}
if (type != null ? !type.equals(that.type) : that.type != null) {
return false;
}
return true;
}
@Override
public int hashCode() {
int result = type != null ? type.hashCode() : 0;
result = 31 * result + (binding != null ? binding.hashCode() : 0);
return result;
}
}
private final TagAttribute binding;
private final String listenerType;
public PhaseListenerHandler(TagConfig config) {
super(config);
TagAttribute type = this.getAttribute("type");
this.binding = this.getAttribute("binding");
if (type != null) {
if (!type.isLiteral()) {
throw new TagAttributeException(type,
"Must be a literal class name of type PhaseListener");
} else {
// test it out
try {
ReflectionUtil.forName(type.getValue());
} catch (ClassNotFoundException e) {
throw new TagAttributeException(type,
"Couldn't qualify PhaseListener", e);
}
}
this.listenerType = type.getValue();
} else {
this.listenerType = null;
}
}
public void apply(FaceletContext ctx, UIComponent parent)
throws IOException {
if (ComponentHandler.isNew(parent)) {
UIViewRoot root = ComponentSupport.getViewRoot(ctx, parent);
if (root == null) {
throw new TagException(this.tag, "UIViewRoot not available");
}
ValueExpression b = null;
if (this.binding != null) {
b = this.binding.getValueExpression(ctx, PhaseListener.class);
}
PhaseListener pl = new LazyPhaseListener(this.listenerType, b);
// special handling for UIViewRoot since ComponentHandler.isNew()
// will always return true
if (parent instanceof UIViewRoot) {
List<PhaseListener> listeners = root.getPhaseListeners();
if (!listeners.contains(pl)) {
root.addPhaseListener(pl);
}
} else {
root.addPhaseListener(pl);
}
}
}
}