Scale.java

/*
 * 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;

/**
 * The temperature scale.
 * 
 * @author Pete Muir
 * 
 */
public enum Scale {

    CELSIUS("\u2103"), FAHRENHEIT("\u2109");

    private final String symbol;

    /**
     * Constructor for a scale, taking the symbol used to represent the temperature scale.
     * 
     * @param symbol
     */
    private Scale(String symbol) {
        this.symbol = symbol;
    }

    public static Scale valueOfAbbreviation(String value) {
        if (value == null) {
            throw new IllegalArgumentException("value must not be null");
        } else if ("C".equals(value.toUpperCase())) {
            return CELSIUS;
        } else if ("F".equals(value.toUpperCase())) {
            return FAHRENHEIT;
        } else {
            throw new IllegalArgumentException(value + " not recognized as a valid scale");
        }
    }

    public String getSymbol() {
        return symbol;
    }

}