/**
 * Find Security Bugs
 * Copyright (c) Philippe Arteau, All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3.0 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library.
 */
package testcode.script;

import javax.el.ELContext;
import javax.el.ExpressionFactory;
import javax.el.ValueExpression;
import javax.faces.context.FacesContext;

public class ElExpressionSample {

    public void unsafeEL(String expression) {
        FacesContext context = FacesContext.getCurrentInstance();
        ExpressionFactory expressionFactory = context.getApplication().getExpressionFactory();
        ELContext elContext = context.getELContext();
        ValueExpression vex = expressionFactory.createValueExpression(elContext, expression, String.class);
        String result = (String) vex.getValue(elContext);
        System.out.println(result);
    }

    public void safeEL() {
        FacesContext context = FacesContext.getCurrentInstance();
        ExpressionFactory expressionFactory = context.getApplication().getExpressionFactory();
        ELContext elContext = context.getELContext();
        ValueExpression vex = expressionFactory.createValueExpression(elContext, "1+1", String.class);
        String result = (String) vex.getValue(elContext);
        System.out.println(result);
    }

    public void unsafeELMethod(ELContext elContext,ExpressionFactory expressionFactory, String expression) {
        expressionFactory.createMethodExpression(elContext, expression, String.class, new Class[]{Integer.class});
    }

    public void safeELMethod(ELContext elContext,ExpressionFactory expressionFactory) {
        expressionFactory.createMethodExpression(elContext, "1+1", String.class,new Class[] {Integer.class});
    }
}