javax.faces.convert.CharacterConverter Maven / Gradle / Ivy

Show more of this group Show more artifacts with this name
Show all versions of jboss-jsf-api_2.3_spec Show documentation

Jakarta Server Faces defines an MVC framework for building user interfaces for web applications, including UI components, state management, event handing, input validation, page navigation, and support for internationalization and accessibility.

There is a newer version: 3.1.0.SP02

Show newest version

/*
 * Copyright (c) 1997, 2018 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0, which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the
 * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
 * version 2 with the GNU Classpath Exception, which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 */

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}
     */
    @Override
    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}
     */
    @Override
    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);
        }

    }
}