de.alpharogroup.wicket.behaviors.models.ModelUpdateBehavior.java Source code

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Here is the source code for de.alpharogroup.wicket.behaviors.models.ModelUpdateBehavior.java

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/**
 * Copyright (C) 2010 Asterios Raptis
 *
 * 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 de.alpharogroup.wicket.behaviors.models;

import java.io.Serializable;
import java.util.Objects;

import org.apache.wicket.Component;
import org.apache.wicket.ajax.AjaxRequestTarget;
import org.apache.wicket.behavior.Behavior;
import org.apache.wicket.event.IEvent;
import org.apache.wicket.model.IModel;
import org.apache.wicket.util.lang.Args;

import de.alpharogroup.wicket.base.util.ComponentFinder;

/**
 * The class {@link ModelUpdateBehavior}.
 *
 * @param <T>
 *            the generic type of the model
 */
public class ModelUpdateBehavior<T extends Serializable> extends Behavior {

    /** The Constant serialVersionUID. */
    private static final long serialVersionUID = 1L;

    /**
     * Factory method to create a new {@link ModelUpdateBehavior} object.
     *
     * @param <T>
     *            the generic type of the model
     * @param model
     *            the model
     * @return the new {@link ModelUpdateBehavior} object
     */
    public static <T extends Serializable> ModelUpdateBehavior<T> of(final IModel<T> model) {
        return new ModelUpdateBehavior<>(model);
    }

    /** The model. */
    private IModel<T> model;

    /** The model object. */
    private T previousModelObject;

    /**
     * Instantiates a new {@link ModelUpdateBehavior}.
     *
     * @param model
     *            the model
     */
    public ModelUpdateBehavior(final IModel<T> model) {
        this.model = Args.notNull(model, "model");
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void bind(final Component component) {
        super.bind(component);
        component.setOutputMarkupPlaceholderTag(true);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void onConfigure(final Component component) {
        super.onConfigure(component);
        this.previousModelObject = this.model.getObject();
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void onEvent(final Component component, final IEvent<?> event) {
        super.onEvent(component, event);
        final T currentModelObject = this.model.getObject();
        if (!Objects.equals(currentModelObject, this.previousModelObject)) {
            this.previousModelObject = currentModelObject;
            component.modelChanging();
            component.modelChanged();
            final AjaxRequestTarget ajaxRequestTarget = ComponentFinder.findAjaxRequestTarget();
            if (ajaxRequestTarget != null) {
                ajaxRequestTarget.add(component);
            }
        }
    }

}