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package com.flexive.faces.converter;

import org.apache.commons.lang.StringUtils;

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

/**
 * Generic JSF enum converter. Drop this as soon as we migrate to JSF 1.2.
 *
 * @author Daniel Lichtenberger (daniel.lichtenberger@flexive.com), UCS - unique computing solutions gmbh (http://www.ucs.at)
 * @version $Rev: 1 $
 */
public class EnumConverter implements Converter {

    /**
     * {@inheritDoc}
     */
    @SuppressWarnings({"unchecked"})
    public Object getAsObject(FacesContext facesContext, UIComponent uiComponent, String value) {
        if (StringUtils.isBlank(value)) {
            return null;
        }
        String[] values = value.split("::");
        if (values.length != 2) {
            throw new IllegalArgumentException("Invalid argument for enum converter: " + value);
        }
        try {
            return Enum.valueOf((Class<? extends Enum>) Class.forName(values[0]), values[1]);
        } catch (ClassNotFoundException e) {
            throw new IllegalArgumentException(e);
        }
    }

    /**
     * {@inheritDoc}
     */
    public String getAsString(FacesContext facesContext, UIComponent uiComponent, Object object) {
        if (object == null) {
            return null;
        }
        Enum value = (Enum) object;
        // replace inner class suffixes of class name and append enum name
        return value.getClass().getName().replaceFirst("\\$\\d+$", "") + "::" + value.name();
    }
}
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