Java tutorial
/* * Created: Sat Jan 21 15:44:22 BRST 2012 * * Copyright (C) 2012 Ricardo Niederberger Cabral * <ricardo.cabral at imgseek.net> * * 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 2 * 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, write to the Free Software * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ package net.imgseek.server.demo.client; import gwtupload.client.IUploadStatus.Status; import gwtupload.client.IUploader; import gwtupload.client.IUploader.OnFinishUploaderHandler; import gwtupload.client.IUploader.UploadedInfo; import gwtupload.client.MultiUploader; import java.util.ArrayList; import java.util.List; import net.imgseek.server.demo.shared.DbImageResult; import com.google.gwt.core.client.EntryPoint; import com.google.gwt.core.client.GWT; import com.google.gwt.event.logical.shared.ValueChangeEvent; import com.google.gwt.event.logical.shared.ValueChangeHandler; import com.google.gwt.i18n.client.NumberFormat; import com.google.gwt.user.client.History; import com.google.gwt.user.client.rpc.AsyncCallback; import com.google.gwt.user.client.ui.Grid; import com.google.gwt.user.client.ui.HTML; import com.google.gwt.user.client.ui.HorizontalPanel; import com.google.gwt.user.client.ui.Hyperlink; import com.google.gwt.user.client.ui.Image; import com.google.gwt.user.client.ui.Label; import com.google.gwt.user.client.ui.RootPanel; import com.google.gwt.user.client.ui.VerticalPanel; /** * Entry point classes define <code>onModuleLoad()</code>. */ public class Iskdaemon_demo implements EntryPoint, ValueChangeHandler<String> { private static final int GRID_COLS = 4; private static final int NUMRES = 12; private static final NumberFormat df = NumberFormat.getFormat("#.##"); /** * Create a remote service proxy to talk to the server-side Isk service. */ private final IskDemoServiceAsync iskDemoService = GWT.create(IskDemoService.class); private final Grid resultsGrid = new Grid(3, GRID_COLS); private final MultiUploader uploaderControl = new MultiUploader(); private OnFinishUploaderHandler onFinishUploaderHandler = new IUploader.OnFinishUploaderHandler() { public void onFinish(IUploader uploader) { if (uploader.getStatus() == Status.SUCCESS) { // The server sends useful information to the client by default UploadedInfo info = uploader.getServerInfo(); List<DbImageResult> result = new ArrayList<DbImageResult>(); String ps[] = info.message.split(";"); for (int i = 0; i < ps.length / 3; i++) { DbImageResult nr = new DbImageResult(); nr.setId(Integer.parseInt(ps[i * 3])); nr.setScore(Double.parseDouble(ps[i * 3 + 1])); nr.setUrl(ps[i * 3 + 2]); result.add(nr); } showResults(result); uploaderControl.reset(); } } }; /** * This is the entry point method. */ public void onModuleLoad() { VerticalPanel mvp = new VerticalPanel(); RootPanel.get("main").add(mvp); HorizontalPanel hhp = new HorizontalPanel(); mvp.add(hhp); hhp.add(new HTML("<h2>isk-daemon example</h2>")); hhp.add(new HTML( "<p><a href=http://server.imgseek.net/>isk-daemon</a> is an open source database server capable of adding content-based (visual) image searching to any image related website or software. Click on the '+ similar' link below each image to search by visual similarity. You can also upload your own image by clicking on the 'Choose file' button below. See <a href='http://www.imgseek.net/isk-daemon/demo'>more details</a> about this demo, including source code.</p>")); hhp.add(new Hyperlink("Random images", "similar-0")); // Create a new uploader panel and attach it to the document uploaderControl.setAutoSubmit(true); mvp.add(uploaderControl); // Add a finish handler which will load the image once the upload // finishes uploaderControl.addOnFinishUploadHandler(onFinishUploaderHandler); mvp.add(resultsGrid); mvp.add(new HTML( "<br/>Copyright 2012 <a href=http://www.imgseek.net/>imgSeek project</a>. Sample images are copyrighted by <a href=http://www.vision.caltech.edu/Image_Datasets/Caltech256/>Caltech 256</a>. Includes 30,607 images, covering a large number of categories.")); // If the application starts with no history token, redirect to a new String initToken = History.getToken(); if (initToken.length() == 0) { History.newItem("similar-0"); } // Add history listener History.addValueChangeHandler(this); // Now that we've setup our listener, fire the initial history state. History.fireCurrentHistoryState(); } private void showResults(List<DbImageResult> result) { resultsGrid.clear(); int i = 0; for (DbImageResult res : result) { VerticalPanel rvp = new VerticalPanel(); rvp.setStyleName("dotted"); rvp.add(new Image(res.getUrl())); HorizontalPanel hc = new HorizontalPanel(); String scoreLabel = "(random) "; if (res.getScore() > 0) scoreLabel = df.format(res.getScore()) + "%"; hc.add(new Label(scoreLabel)); hc.add(new Hyperlink(" + similar", "similar-" + res.getId())); rvp.add(hc); resultsGrid.setWidget(i / GRID_COLS, i % GRID_COLS, rvp); i++; } } @Override public void onValueChange(ValueChangeEvent<String> event) { int tid = 0; try { tid = Integer.parseInt(event.getValue().substring(8)); } catch (NumberFormatException e) { e.printStackTrace(); } iskDemoService.queryImgID(tid, NUMRES, false, new AsyncCallback<List<DbImageResult>>() { public void onFailure(Throwable caught) { // TODO Show the RPC error message to the user } public void onSuccess(List<DbImageResult> result) { showResults(result); } }); } }