dk.teachus.frontend.components.form.AbstractInputElement.java Source code

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Here is the source code for dk.teachus.frontend.components.form.AbstractInputElement.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 dk.teachus.frontend.components.form;

import java.util.ArrayList;
import java.util.List;

import org.apache.wicket.Component;
import org.apache.wicket.feedback.IFeedbackMessageFilter;
import org.apache.wicket.markup.html.basic.Label;
import org.apache.wicket.markup.html.form.FormComponent;
import org.apache.wicket.markup.html.panel.FeedbackPanel;
import org.apache.wicket.model.AbstractReadOnlyModel;
import org.apache.wicket.model.IModel;
import org.apache.wicket.validation.IValidator;

public abstract class AbstractInputElement<T> extends FormElement {
    private static final long serialVersionUID = 1L;

    private boolean readOnly;
    private boolean attached = false;
    protected boolean required;
    protected String label;
    private List<IValidator<T>> validators = new ArrayList<IValidator<T>>();

    protected FeedbackPanel feedbackPanel;

    public AbstractInputElement(String label) {
        this(label, false);
    }

    public AbstractInputElement(String label, boolean required) {
        this.required = required;
        this.label = label;
    }

    public void add(IValidator<T> validator) {
        validators.add(validator);
    }

    public FeedbackPanel getFeedbackPanel() {
        return feedbackPanel;
    }

    public boolean isReadOnly() {
        return readOnly;
    }

    public void setReadOnly(boolean readOnly) {
        this.readOnly = readOnly;
    }

    @Override
    protected void onBeforeRender() {
        super.onBeforeRender();

        if (attached == false) {
            Component label = newLabelComponent("label");
            add(label);

            IModel<String> requiredModel = new AbstractReadOnlyModel<String>() {
                private static final long serialVersionUID = 1L;

                @Override
                public String getObject() {
                    return required ? "*" : "&nbsp;";
                }
            };
            add(new Label("required", requiredModel).setEscapeModelStrings(false));

            feedbackPanel = new FeedbackPanel("feedback");
            feedbackPanel.setOutputMarkupId(true);
            add(feedbackPanel);

            Component input = newInputComponent("input", feedbackPanel);
            add(input);

            feedbackPanel.setFilter(getFeedbackMessageFilter());

            for (IValidator<T> validator : validators) {
                addValidator(validator);
            }

            onEndAttach();

            attached = true;
        }
    }

    protected void onEndAttach() {
    }

    protected Component newLabelComponent(String wicketId) {
        return new Label(wicketId, label).setRenderBodyOnly(true);
    }

    protected abstract Component newInputComponent(String wicketId, FeedbackPanel feedbackPanel);

    protected abstract IFeedbackMessageFilter getFeedbackMessageFilter();

    protected abstract void addValidator(IValidator<T> validator);

    protected abstract FormComponent<T> getFormComponent();

}