/*
* $Id: SetPropertyActionListenerImpl.java,v 1.10 2007/07/19 15:50:55 rlubke Exp $
*/
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package com.sun.faces.taglib.jsf_core;
import javax.el.ELContext;
import javax.el.ELException;
import javax.el.ValueExpression;
import javax.el.ExpressionFactory;
import javax.faces.component.StateHolder;
import javax.faces.context.FacesContext;
import javax.faces.event.AbortProcessingException;
import javax.faces.event.ActionEvent;
import javax.faces.event.ActionListener;
public class SetPropertyActionListenerImpl implements ActionListener, StateHolder {
private ValueExpression target;
private ValueExpression source;
// ------------------------------------------------------------ Constructors
public SetPropertyActionListenerImpl() {}
public SetPropertyActionListenerImpl(ValueExpression target, ValueExpression value) {
this.target = target;
this.source = value;
}
// --------------------------------------------- Methods from ActionListener
public void processAction(ActionEvent e) throws AbortProcessingException {
FacesContext facesContext = FacesContext.getCurrentInstance();
ELContext elContext = facesContext.getELContext();
try {
Object value = source.getValue(elContext);
if (value != null) {
ExpressionFactory factory =
facesContext.getApplication().getExpressionFactory();
value = factory.coerceToType(value, target.getType(elContext));
}
target.setValue(elContext, value);
} catch (ELException ele) {
throw new AbortProcessingException(ele);
}
}
// ------------------------------------------------ Methods from StateHolder
public void setTransient(boolean trans) {
}
public boolean isTransient() {
return false;
}
public Object saveState(FacesContext context) {
if (context == null) {
throw new NullPointerException();
}
Object [] state = new Object[2];
state[0] = target;
state[1] = source;
return state;
}
public void restoreState(FacesContext context, Object state) {
if (context == null) {
throw new NullPointerException();
}
if (state == null) {
return;
}
Object [] stateArray = (Object []) state;
target = (ValueExpression) stateArray[0];
source = (ValueExpression) stateArray[1];
}
}