--- /dev/null
+/*
+ * Copyright (C) 2008 ZXing authors
+ *
+ * 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 com.google.zxing.web.generator.client;
+
+import com.google.gwt.http.client.URL;
+import com.google.gwt.user.client.ui.Button;
+import com.google.gwt.user.client.ui.ChangeListener;
+import com.google.gwt.user.client.ui.ClickListener;
+import com.google.gwt.user.client.ui.Grid;
+import com.google.gwt.user.client.ui.TextBox;
+import com.google.gwt.user.client.ui.Widget;
+
+/**
+ * A generator for geo location. It also accepts a google maps links and
+ * extracts the coordinates and query from the URL.
+ *
+ * @author Yohann Coppel
+ */
+public class GeoLocationGenerator implements GeneratorSource {
+ private static final String LON_REGEXP = "[+-]?[0-9]+(.[0-9]+)?";
+ private static final String LAT_REGEXP = "[+-]?[0-9]+(.[0-9]+)?";
+
+ Grid table = null;
+ TextBox latitude = new TextBox();
+ TextBox longitude = new TextBox();
+ TextBox query = new TextBox();
+ TextBox mapsLink = new TextBox();
+
+ public GeoLocationGenerator(ChangeListener listener) {
+ latitude.addStyleName(StylesDefs.INPUT_FIELD_REQUIRED);
+ longitude.addStyleName(StylesDefs.INPUT_FIELD_REQUIRED);
+ latitude.addChangeListener(listener);
+ longitude.addChangeListener(listener);
+ query.addChangeListener(listener);
+ }
+
+ public String getName() {
+ return "Geo location";
+ }
+
+ public String getText() throws GeneratorException {
+ String que = getQueryField();
+ if (null != que && que.length() > 0) {
+ if (null == getLatitudeField()) {
+ latitude.setText("0");
+ }
+ if (null == getLongitudeField()) {
+ longitude.setText("0");
+ }
+ }
+ String lat = getLatitudeField();
+ String lon = getLongitudeField();
+
+ if (que.length() > 0) {
+ return "geo:"+lat+","+lon+"?q="+que;
+ }
+
+ return "geo:"+lat+","+lon;
+ }
+
+ private String getQueryField() {
+ String que = query.getText();
+ que = que.replace("&", "%26");
+ return que;
+ }
+
+ private String getLongitudeField() throws GeneratorException {
+ String lon = longitude.getText();
+ if (!lon.matches(LON_REGEXP)) {
+ throw new GeneratorException("Longitude is not a correct value.");
+ }
+ double val = Double.parseDouble(lon);
+ if (val < -180 || val > 180) {
+ throw new GeneratorException("Longitude must be in [-180:180]");
+ }
+ return lon;
+ }
+
+ private String getLatitudeField() throws GeneratorException {
+ String lat = latitude.getText();
+ if (!lat.matches(LAT_REGEXP)) {
+ throw new GeneratorException("Latitude is not a correct value.");
+ }
+ double val = Double.parseDouble(lat);
+ if (val < -90 || val > 90) {
+ throw new GeneratorException("Latitude must be in [-90:90]");
+ }
+ return lat;
+ }
+
+ public Grid getWidget() {
+ if (table != null) {
+ return table;
+ }
+ table = new Grid(5, 2);
+
+ table.setText(0, 0, "Latitude");
+ table.setWidget(0, 1, latitude);
+ table.setText(1, 0, "Longitude");
+ table.setWidget(1, 1, longitude);
+ table.setText(2, 0, "Query");
+ table.setWidget(2, 1, query);
+ table.setText(3, 0, "OR");
+ table.setText(3, 1, "enter a Google Maps link and click Fill:");
+ // looks like this:
+ // http://maps.google.com/?ie=UTF8&ll=40.741404,-74.00322&spn=0.001484,0.003101&z=18
+ Button fill = new Button("Fill ↑");
+ fill.addClickListener(new ClickListener() {
+ public void onClick(Widget sender) {
+ fillWithMaps();
+ }
+ });
+ table.setWidget(4, 0, fill);
+ table.setWidget(4, 1, mapsLink);
+
+ return table;
+ }
+
+ protected void fillWithMaps() {
+ String link = mapsLink.getText();
+ if (!link.matches("http://maps.google.com/.*")) {
+ return;
+ }
+ String q = "";
+ if (link.matches(".*&q=[^&]*&.*")) {
+ for (int i = link.indexOf("&q=") + 3;
+ i < link.length() && link.charAt(i) != '&'; ++i) {
+ q += link.charAt(i);
+ }
+ // special cases:
+ q = q.replace("+", " ");
+ q = q.replace("%26", "&");
+ }
+
+ String lat = "";
+ String lon = "";
+ if (link.matches(".*&s?ll=[^&]*&.*")) {
+ boolean beforeComa = true;
+ int start = 0;
+ if (link.indexOf("&sll=") == -1) {
+ start = link.indexOf("&ll=") + 4;
+ } else {
+ start = link.indexOf("&sll=") + 5;
+ }
+ for (int i = start; i < link.length() && link.charAt(i) != '&'; ++i) {
+ if (beforeComa) {
+ if (link.charAt(i) == ',') {
+ beforeComa = false;
+ } else {
+ lat += link.charAt(i);
+ }
+ } else {
+ lon += link.charAt(i);
+ }
+ }
+ }
+
+ query.setText(URL.decode(q));
+ latitude.setText(lat);
+ longitude.setText(lon);
+ }
+
+ public void validate(Widget widget) throws GeneratorException {
+ if (widget == latitude) getLatitudeField();
+ if (widget == longitude) getLongitudeField();
+ }
+
+ public void setFocus() {
+ latitude.setFocus(true);
+ }
+}
projects / zxing.git / blobdiff