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

Go to download
Show more of this group Show more artifacts with this name
Show all versions of javax.faces Show documentation
This is the master POM file for Oracle's Implementation of the JSF 2.2 Specification.
There is a newer version: 2.4.0
/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2010 Oracle and/or its affiliates. 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.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.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
 * "Portions Copyright [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.Double
 * (and double primitive) values.
 */

public class DoubleConverter implements Converter {

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


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

    /**
     * The message identifier of the {@link javax.faces.application.FacesMessage} to be created if
     * the conversion to Double 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 DOUBLE_ID =
         "javax.faces.converter.DoubleConverter.DOUBLE";

    /**
     * The message identifier of the {@link javax.faces.application.FacesMessage} to be created if
     * the conversion of the Double 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 (Double.valueOf(value));
        } catch (NumberFormatException nfe) {
            throw new ConverterException(MessageFactory.getMessage(
                 context, DOUBLE_ID, value, "1999999",
                 MessageFactory.getLabel(context, component)), nfe);
        } catch (Exception e) {
            throw new ConverterException(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 "";
        }

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

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