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This is the master POM file for Sun's Implementation of the JSF 1.2 Specification.
There is a newer version: 2.1
/*
 * $Id: ByteConverter.java,v 1.19 2007/04/27 22:00:07 ofung Exp $
 */

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 * 
 * Copyright 1997-2007 Sun Microsystems, Inc. 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.html
 * or glassfish/bootstrap/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 glassfish/bootstrap/legal/LICENSE.txt.
 * Sun designates this particular file as subject to the "Classpath" exception
 * as provided by Sun in the GPL Version 2 section of the License file that
 * accompanied this code.  If applicable, add the following below the License
 * Header, with the fields enclosed by brackets [] replaced by your own
 * identifying information: "Portions Copyrighted [year]
 * [name of copyright owner]"
 * 
 * Contributor(s):
 * 
 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * 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
 * 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.
 */

package javax.faces.convert;


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


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

public class ByteConverter implements Converter {

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


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

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

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

     */
    public static final String BYTE_ID =
         "javax.faces.converter.ByteConverter.BYTE";

    /**
     * The message identifier of the {@link javax.faces.application.FacesMessage} to be created if
     * the conversion of the Byte 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 (Byte.valueOf(value));
        } catch (NumberFormatException nfe) {
            throw new ConverterException(
                 MessageFactory.getMessage(context,
                                           BYTE_ID,
                                           value,
                                           "254",
                                           MessageFactory.getLabel(context,
                                                                   component)));
        } catch (Exception e) {
            throw new ConverterException(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 "";
        }

        // If the incoming value is still a string, play nice
        // and return the value unmodified
        if (value instanceof String) {
            return (String) value;
        }

        try {
            return (Byte.toString(((Byte) value).byteValue()));
        } catch (Exception e) {
            throw new ConverterException(
                 MessageFactory.getMessage(context,
                                           STRING_ID,
                                           value,
                                           MessageFactory.getLabel(context,
                                                                   component)),
                                           e);
        }
    }
}