com.socialsite.image.ImagePanel.java Source code

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Here is the source code for com.socialsite.image.ImagePanel.java

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/**
 *     Copyright SocialSite (C) 2009
 *
 *     This program is free software: you can redistribute it and/or modify
 *     it under the terms of the GNU General Public License as published by
 *     the Free Software Foundation, either version 3 of the License, or
 *     (at your option) any later version.
 *
 *     This program 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 General Public License for more details.
 *
 *     You should have received a copy of the GNU General Public License
 *     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package com.socialsite.image;

import java.util.Date;

import org.apache.wicket.ResourceReference;
import org.apache.wicket.ajax.AjaxRequestTarget;
import org.apache.wicket.ajax.markup.html.AjaxLink;
import org.apache.wicket.extensions.ajax.markup.html.modal.ModalWindow;
import org.apache.wicket.markup.html.form.upload.FileUpload;
import org.apache.wicket.markup.html.image.Image;
import org.apache.wicket.util.value.ValueMap;

import com.socialsite.BasePanel;
import com.socialsite.ajax.fileupload.UploadPanel;
import com.socialsite.authentication.SocialSiteRoles;

/**
 * @author Ananth
 */
public class ImagePanel extends BasePanel {

    /**
     * 
     */
    private static final long serialVersionUID = 1L;
    final private boolean changeLink;

    /**
     * sets the thumnail as false
     * 
     * @param component
     *            component id
     * @param id
     *            id used to fetch the image
     * @param imageType
     *            type of the image (userimage , courseimage etc)
     * @param lastModified
     *            lastmodified date of the image
     */
    public ImagePanel(final String component, final long id, final ImageType imageType, final Date lastModified) {
        this(component, id, imageType, lastModified, false, true);
    }

    public ImagePanel(final String component, final long id, final ImageType imageType, final Date lastModified,
            final boolean thumb) {
        this(component, id, imageType, lastModified, thumb, false);
    }

    /**
     * 
     * @param component
     *            component id
     * @param id
     *            id used to fetch the image
     * @param imageType
     *            type of the image (userimage , courseimage etc)
     * @param thumb
     *            will show thumb image if true
     * @param lastModified
     *            lastmodified date of the image
     */
    public ImagePanel(final String component, final long id, final ImageType imageType, final Date lastModified,
            final boolean thumb, final boolean changeLink) {
        super(component);

        this.changeLink = changeLink;

        // allow the modal window to update the panel
        setOutputMarkupId(true);
        final ResourceReference imageResource = new ResourceReference(imageType.name());
        final Image userImage;
        final ValueMap valueMap = new ValueMap();
        valueMap.add("id", id + "");

        // the version is used to change the url dynamically if the image is
        // changed. This will allow the browser to cache images
        // reference http://code.google.com/speed/page-speed/docs/caching.html
        // #Use fingerprinting to dynamically enable caching.
        valueMap.add("version", lastModified.getTime() + "");
        if (thumb) {
            valueMap.add("thumb", "true");
        }
        add(userImage = new Image("userimage", imageResource, valueMap));
        userImage.setOutputMarkupId(true);

        final ModalWindow modal;
        add(modal = new ModalWindow("modal"));

        modal.setContent(new UploadPanel(modal.getContentId()) {

            /**
             * 
             */
            private static final long serialVersionUID = 1L;

            @Override
            public String onFileUploaded(final FileUpload upload) {

                if (upload == null || upload.getSize() == 0) {
                    // No image was provided
                    error("Please upload an image.");
                } else if (!checkContentType(upload.getContentType())) {
                    error("Only images of types png, jpg, and gif are allowed.");
                } else {
                    saveImage(upload.getBytes());
                }

                return null;
            }

            @Override
            public void onUploadFinished(final AjaxRequestTarget target, final String filename,
                    final String newFileUrl) {

                final ResourceReference imageResource = new ResourceReference(imageType.name());

                final ValueMap valueMap = new ValueMap();
                valueMap.add("id", id + "");
                // change the image lively
                valueMap.add("version", new Date().getTime() + "");
                if (thumb) {
                    valueMap.add("thumb", "true");
                }

                userImage.setImageResourceReference(imageResource, valueMap);
                // update the image after the user changes it
                target.addComponent(userImage);
            }
        });
        modal.setTitle(" Select the image ");
        modal.setCookieName("modal");

        modal.setCloseButtonCallback(new ModalWindow.CloseButtonCallback() {
            /**
             * 
             */
            private static final long serialVersionUID = 1L;

            public boolean onCloseButtonClicked(final AjaxRequestTarget target) {
                return true;
            }
        });

        modal.setWindowClosedCallback(new ModalWindow.WindowClosedCallback() {
            /**
             * 
             */
            private static final long serialVersionUID = 1L;

            public void onClose(final AjaxRequestTarget target) {
            }
        });

        add(new AjaxLink<Void>("changeimage") {
            /**
             * 
             */
            private static final long serialVersionUID = 1L;

            @Override
            public boolean isVisible() {
                if (changeLink) {
                    // TODO allow admins to change the university image and
                    // allow
                    // staffs to change the course image
                    // it. don't show it for thumb images
                    return hasRole(SocialSiteRoles.OWNER) || hasRole(SocialSiteRoles.STAFF);
                }
                return false;

            }

            @Override
            public void onClick(final AjaxRequestTarget target) {
                modal.show(target);
            }
        });
    }

    private boolean checkContentType(final String contentType) {
        if (contentType.equalsIgnoreCase("image/gif") || contentType.equalsIgnoreCase("image/jpeg")
                || contentType.equalsIgnoreCase("image/png")) {
            return true;
        }
        return false;
    }

    /**
     * override this method to save the file
     * 
     * @param imageData
     */
    protected void saveImage(final byte[] imageData) {

    }
}