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ProtoBuf integration with EL 3.0
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/*
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 *
 * Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU General Public License
 * Version 2 only ("GPL") or the Common Development and Distribution License("CDDL") (collectively,
 * the "License"). You may not use this file except in compliance with the License. You can obtain a
 * copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html or
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 * exception as provided by Oracle in the GPL Version 2 section of the License file that accompanied
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 * either the CDDL, the GPL Version 2 or to extend the choice of license to its licensees as
 * provided above. However, if you add GPL Version 2 code and therefore, elected the GPL Version 2
 * license, then the option applies only if the new code is made subject to such option by the
 * copyright holder.
 *
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 * This file incorporates work covered by the following copyright and permission notice:
 *
 * Copyright 2004 The Apache Software Foundation
 *
 * 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
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 * 
 * "Portions Copyright [2014] [David Tesler (https://github.com/protobufel)]"
 */
package com.github.protobufel.el;

/**
 * Useful utility methods, taken from javax.el package in the modified and unmodified form. 
 *  
 * @author [email protected] David Tesler
 */
public final class ELSupport {
  private ELSupport() {}
  
  public static int toInteger(final Object p) {
    if (p instanceof Integer) {
      return ((Integer) p).intValue();
    }
    if (p instanceof Character) {
      return ((Character) p).charValue();
    }
    if (p instanceof Number) {
      return ((Number) p).intValue();
    }
    if (p instanceof String) {
      return Integer.parseInt((String) p);
    }
    throw new IllegalArgumentException();
  }
}