net.databinder.components.UriTextField.java Source code

Introduction

Here is the source code for net.databinder.components.UriTextField.java

Source

/*
 * Databinder: a simple bridge from Wicket to Hibernate
 * Copyright (C) 2007  Nathan Hamblen nathan@technically.us
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
package net.databinder.components;

import java.net.URI;
import java.util.Locale;

import net.databinder.converters.URIConverter;
import net.databinder.validators.URIValidator;

import org.apache.wicket.markup.html.form.TextField;
import org.apache.wicket.util.convert.IConverter;
import org.apache.wicket.util.string.Strings;

/**
 * TextField for URIs with a default scheme. This field establishes a default URI scheme
 * and equates it to a null URI. For the UriTextField.Http subclass, the field is initialized with 
 * "http://" and if unchanged the model will be left null. 
 * @author Nathan Hamblen
 */
public class UriTextField extends TextField<URI> {

    private String scheme;

    /** Costructor called by nested subclasses. */
    private UriTextField(String id, String scheme) {
        super(id, java.net.URI.class);
        this.scheme = scheme;
    }

    private String defaultValue() {
        return scheme + "://";
    }

    /**
     * Return default value when null. Note that converter is not called from base if null.
     */
    @Override
    protected String getModelValue() {
        String value = super.getModelValue();
        if (Strings.isEmpty(value))
            return defaultValue();
        return value;
    }

    /** @return specialized converter that equates a default string value to null */
    @SuppressWarnings("unchecked")
    @Override
    public IConverter getConverter(Class type) {
        return new URIConverter() {
            @Override
            public URI convertToObject(String value, Locale locale) {
                if (value == null || value.equals(defaultValue()))
                    return null;
                return super.convertToObject(value, locale);
            }
        };
    }

    public static class Http extends UriTextField {
        public Http(String id) {
            super(id, "http");
            add(URIValidator.HttpScheme());
        }
    }

    public static class Ftp extends UriTextField {
        public Ftp(String id) {
            super(id, "ftp");
            add(URIValidator.FtpScheme());
        }
    }
}