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package javax.faces.convert;


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


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

public class CharacterConverter implements Converter {

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


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

    /**
     * <p>The message identifier of the {@link javax.faces.application.FacesMessage} to be created if
     * the conversion to <code>Character</code> fails.  The message format
     * string for this message may optionally include the following
     * placeholders:
     * <ul>
     * <li><code>{0}</code> replaced by the unconverted value.</li>
     * <li><code>{1}</code> replaced by a <code>String</code> whose value
     * is the label of the input component that produced this message.</li>
     * </ul></p>
     */
    public static final String CHARACTER_ID =
         "javax.faces.converter.CharacterConverter.CHARACTER";

    /**
     * <p>The message identifier of the {@link javax.faces.application.FacesMessage} to be created if
     * the conversion of the <code>Character</code> value to
     * <code>String</code> fails.   The message format string for this message
     * may optionally include the following placeholders:
     * <ul>
     * <li><code>{0}</code> relaced by the unconverted value.</li>
     * <li><code>{1}</code> replaced by a <code>String</code> whose value
     * is the label of the input component that produced this message.</li>
     * </ul></p>
     */
    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);
        }

    }
}
