OptionalInputValidator.java

/**
 * Copyright 2011 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
 * implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.bricket.plugin.contact.web;

import org.apache.wicket.markup.html.form.Form;
import org.apache.wicket.markup.html.form.FormComponent;
import org.apache.wicket.markup.html.form.validation.AbstractFormValidator;

/**
 * @author Ingo Renner
 * @author Henning Teek
 * 
 */
public class OptionalInputValidator extends AbstractFormValidator {
    private final FormComponent<String>[] components;

    /**
     * @param components
     *            to be checked.
     */
    public OptionalInputValidator(FormComponent<String>... components) {
        if (components == null) {
            throw new IllegalArgumentException("argument FormComponent[] components cannot be null");
        }
        this.components = components.clone();
    }

    @Override
    public FormComponent<String>[] getDependentFormComponents() {
        return components.clone();
    }

    @Override
    public void validate(Form<?> form) {
        // we have a choice to validate the type converted values or the raw
        // input values, we validate the raw input
        boolean empty = true;
        for (FormComponent<String> component : components) {
            empty = empty && isEmpty(component.getInput());
        }
        if (empty) {
            for (FormComponent<String> component : components) {
                error(component);
            }
        }
    }

    private boolean isEmpty(String s) {
        if (s == null || "".equals(s)) {
            return true;
        }
        return false;
    }

}