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JSR-000344: JavaServer(TM) Faces 2.2 API
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 *
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 * 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.
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 */

package javax.faces.convert;


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


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

public class BooleanConverter implements Converter {

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


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

    /**
     * The message identifier of the {@link javax.faces.application.FacesMessage} to be created if
     * the conversion to Boolean 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 BOOLEAN_ID =
         "javax.faces.converter.BooleanConverter.BOOLEAN";

    /**
     * The message identifier of the {@link javax.faces.application.FacesMessage} to be created if
     * the conversion of the Boolean 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);
        }

        // Let them know that the value being converted is not specifically
        // "true" or "false".
        try {
            return (Boolean.valueOf(value));
        } catch (Exception e) {
            throw new ConverterException(
                 MessageFactory.getMessage(context,
                                           BOOLEAN_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(
                 MessageFactory.getMessage(context,
                                           STRING_ID,
                                           value,
                                           MessageFactory.getLabel(context,
                                                                   component)),
                                           e);
        }
    }
}