com.userweave.components.image.uploadpage.IconUploadPage.java Source code

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Here is the source code for com.userweave.components.image.uploadpage.IconUploadPage.java

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/*******************************************************************************
 * This file is part of UserWeave.
 *
 *     UserWeave is free software: you can redistribute it and/or modify
 *     it under the terms of the GNU Affero General Public License as published by
 *     the Free Software Foundation, either version 3 of the License, or
 *     (at your option) any later version.
 *
 *     UserWeave 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 Affero General Public License for more details.
 *
 *     You should have received a copy of the GNU Affero General Public License
 *     along with UserWeave.  If not, see <http://www.gnu.org/licenses/>.
 *
 * Copyright 2012 User Prompt GmbH | Psychologic IT Expertise
 *******************************************************************************/
package com.userweave.components.image.uploadpage;

import org.apache.wicket.Component;
import org.apache.wicket.extensions.ajax.markup.html.modal.ModalWindow;
import org.apache.wicket.markup.html.WebMarkupContainer;
import org.apache.wicket.markup.html.form.SubmitLink;
import org.apache.wicket.markup.html.form.upload.FileUploadField;
import org.apache.wicket.markup.html.panel.FeedbackPanel;
import org.apache.wicket.markup.html.panel.Fragment;
import org.apache.wicket.model.IModel;
import org.apache.wicket.model.StringResourceModel;

import com.userweave.components.customModalWindow.BaseModalWindowPage;

/**
 * Web page for modal windows to upload an image file.
 * 
 * @author opr
 *
 */
public abstract class IconUploadPage extends BaseModalWindowPage {
    private static final long serialVersionUID = 1L;

    /**
     * Display panel for the file upload.
     * 
     * @author opr
     */
    private class FileUploadFragment extends Fragment {
        private static final long serialVersionUID = 1L;

        /**
         * The fle upload field for uploading an image.
         */
        private FileUploadField fileUploadField;

        public FileUploadField getFileUploadField() {
            return fileUploadField;
        }

        /**
         * Default constructor.
         * 
         * @param id
         *       Component markup id.
         */
        public FileUploadFragment(String id) {
            super(id, "fileUpload", getForm());

            add(fileUploadField = new FileUploadField("imageFile"));
        }
    }

    /**
     * Message panel to display a success message after successful
     * file upload.
     * 
     * @author opr
     *
     */
    private class MessageFragment extends Fragment {
        private static final long serialVersionUID = 1L;

        /**
         * Default constructor.
         * 
         * @param id
         *       Component markup id.
         */
        public MessageFragment(String id) {
            super(id, "fileUploadMessage", getForm());
        }
    }

    /**
     * The displayed content.
     */
    private Component content;

    /**
     * Reference to the submit button. Wll be invisible after 
     * successful fileupload.
     */
    private WebMarkupContainer submitButton;

    /**
     * Feedbackpanel for error messages.
     */
    private final FeedbackPanel feedback;

    /**
     * Default constructor
     * 
     * @param window
     *       Modal window this page is attached to.
     */
    public IconUploadPage(ModalWindow window) {
        super(window);

        addToForm(content = new FileUploadFragment("content"));

        feedback = new FeedbackPanel("feedback");

        addToForm(feedback);
    }

    @Override
    protected WebMarkupContainer getAcceptButton(String componentId, final ModalWindow window) {
        return submitButton = new SubmitLink(componentId, getForm()) {
            private static final long serialVersionUID = 1L;

            @Override
            public void onSubmit() {
                try {
                    IconUploadPage.this.onSubmit(((FileUploadFragment) content).getFileUploadField());

                    replaceAfterUpload();
                    super.onSubmit();
                } catch (Exception e) {
                    warn(e.getMessage());
                }
            }

        };
    }

    /**
     * Replaces the displayed content and hides the submit button.
     */
    private void replaceAfterUpload() {
        Fragment replacement = new MessageFragment("content");

        content.replaceWith(replacement);

        content = replacement;

        submitButton.setVisible(false);
    }

    @Override
    protected IModel<String> getAcceptLabel() {
        return new StringResourceModel("upload", this, null);
    }

    @Override
    protected IModel<String> getDeclineLabel() {
        return new StringResourceModel("close", this, null);
    }

    /**
     * Processes the file upload.
     * 
     * @param fileUploadField
     *       The field containing the submitted data.
     * 
     * @throws Exception
     *       On error, throw an exception to display a warn
     *       message on the feedback panel.
     */
    protected abstract void onSubmit(FileUploadField fileUploadField) throws Exception;
}