/*
* JBoss, Home of Professional Open Source
* Copyright 2013, Red Hat, Inc. and/or its affiliates, and individual
* contributors by the @authors tag. See the copyright.txt in the
* distribution for a full listing of individual contributors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* http://www.apache.org/licenses/LICENSE-2.0
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.jboss.as.quickstarts.temperatureconverter.ejb;
import static org.jboss.as.quickstarts.temperatureconverter.ejb.Scale.CELSIUS;
import static org.jboss.as.quickstarts.temperatureconverter.ejb.Scale.FAHRENHEIT;
import javax.ejb.Stateless;
import javax.faces.application.FacesMessage;
import javax.faces.context.FacesContext;
/**
* A simple SLSB EJB. The EJB does not use an interface.
*
* @author Bruce Wolfe
*/
@Stateless
public class TemperatureConvertEJB {
/**
* This method takes a temperature in Celsius or Fahrenheit and converts it to the other value.
*
* @param source the temperature to convert from
* @return the converted temperature.
*/
public Temperature convert(Temperature source) {
// Convert our Temperature
if (source.getScale() == CELSIUS) { // Celsius to Fahrenheit
// Easter egg for Absolute Zero.
if (source.getTemperature() < Temperature.ABSOLUTE_ZERO_C) {
FacesContext.getCurrentInstance().addMessage(null, new FacesMessage("Below Absolute Zero!"));
} else if (source.getTemperature() == Temperature.ABSOLUTE_ZERO_C) {
FacesContext.getCurrentInstance().addMessage(null, new FacesMessage("Absolute Zero!"));
}
return new Temperature((source.getTemperature() * 9 / 5) + 32, FAHRENHEIT);
} else if (source.getScale() == FAHRENHEIT) { // Fahrenheit to Celsius
// Easter egg for Absolute Zero.
if (source.getTemperature() < Temperature.ABSOLUTE_ZERO_F) {
FacesContext.getCurrentInstance().addMessage(null, new FacesMessage("Below Absolute Zero!"));
} else if (source.getTemperature() == Temperature.ABSOLUTE_ZERO_F) {
FacesContext.getCurrentInstance().addMessage(null, new FacesMessage("Absolute Zero!"));
}
return new Temperature((source.getTemperature() - 32) * 5 / 9, CELSIUS);
} else { // Should never get here!
throw new IllegalStateException("This is embarrassing - this error should NOT occur!");
}
}
}