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This is the master POM file for Oracle's Implementation of the JSF 2.2 Specification.
There is a newer version: 2.4.0
/*
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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 packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
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 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
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 * enclosed by brackets [] replaced by your own identifying information:
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 * elects to include this software in this distribution under the [CDDL or GPL
 * Version 2] license."  If you don't indicate a single choice of license, a
 * recipient has the option to distribute your version of this file under
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 */

package javax.faces.convert;


import javax.faces.component.UIComponent;
import javax.faces.context.FacesContext;


/**
 * {@link Converter} implementation for java.lang.Character
 * (and char primitive) values.
 */

public class CharacterConverter implements Converter {

    // ------------------------------------------------------ Manifest Constants


    /**
     * The standard converter id for this converter.
     */
    public static final String CONVERTER_ID = "javax.faces.Character";

    /**
     * The message identifier of the {@link javax.faces.application.FacesMessage} to be created if
     * the conversion to Character fails.  The message format
     * string for this message may optionally include the following
     * placeholders:
     * 

     * {0} replaced by the unconverted value.
     * {1} replaced by a String whose value
     * is the label of the input component that produced this message.
     * 

     */
    public static final String CHARACTER_ID =
         "javax.faces.converter.CharacterConverter.CHARACTER";

    /**
     * The message identifier of the {@link javax.faces.application.FacesMessage} to be created if
     * the conversion of the Character value to
     * String fails.   The message format string for this message
     * may optionally include the following placeholders:
     * 

     * {0} relaced by the unconverted value.
     * {1} replaced by a String whose value
     * is the label of the input component that produced this message.
     * 

     */
    public static final String STRING_ID =
         "javax.faces.converter.STRING";

    // ------------------------------------------------------- Converter Methods

    /**
     * @throws ConverterException   {@inheritDoc}
     * @throws NullPointerException {@inheritDoc}
     */
    public Object getAsObject(FacesContext context, UIComponent component,
                              String value) {

        if (context == null || component == null) {
            throw new NullPointerException();
        }

        // If the specified value is null or zero-length, return null
        if (value == null) {
            return (null);
        }
        value = value.trim();
        if (value.length() < 1) {
            return (null);
        }

        try {
            return (value.charAt(0));
        } catch (Exception e) {
            throw new ConverterException(
                 MessageFactory.getMessage(context,
                                           CHARACTER_ID,
                                           value,
                                           MessageFactory.getLabel(context,
                                                                   component)),
                                           e);
        }
    }

    /**
     * @throws ConverterException   {@inheritDoc}
     * @throws NullPointerException {@inheritDoc}
     */
    public String getAsString(FacesContext context, UIComponent component,
                              Object value) {

        if (context == null || component == null) {
            throw new NullPointerException();
        }

        // If the specified value is null, return a zero-length String
        if (value == null) {
            return "";
        }

        try {
            return (value.toString());
        } catch (Exception e) {
            throw new ConverterException(e);
        }

    }
}