SetPropertyActionListenerImpl.java

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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


    @Override
    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

    
    @Override
    public void setTransient(boolean trans) {
    }

    
    @Override
    public boolean isTransient() {

        return false;

    }

    
    @Override
    public Object saveState(FacesContext context) {

        if (context == null) {
            throw new NullPointerException();
        }
        Object [] state = new Object[2];
        state[0] = target;
        state[1] = source;
        return state;

    }
    
    @Override
    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];

    }
    
}