/*
* SendNonBlockJsonScreen.java
*
* Copyright � 1998-2011 Research In Motion Limited
*
* 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.
*
* Note: For the sake of simplicity, this sample application may not leverage
* resource bundles and resource strings. However, it is STRONGLY recommended
* that application developers make use of the localization features available
* within the BlackBerry development platform to ensure a seamless application
* experience across a variety of languages and geographies. For more information
* on localizing your application, please refer to the BlackBerry Java Development
* Environment Development Guide associated with this release.
*/
package com.rim.samples.device.communicationapidemo.view;
import net.rim.device.api.io.messaging.Message;
import net.rim.device.api.io.messaging.MessageProcessorException;
import net.rim.device.api.io.parser.json.JSONMessageProcessor;
import net.rim.device.api.ui.DrawStyle;
import net.rim.device.api.ui.Field;
import net.rim.device.api.ui.FieldChangeListener;
import net.rim.device.api.ui.Graphics;
import net.rim.device.api.ui.component.Dialog;
import net.rim.device.api.ui.component.EditField;
import net.rim.device.api.ui.component.TreeField;
import net.rim.device.api.ui.component.TreeFieldCallback;
import net.rim.device.api.ui.container.MainScreen;
import org.json.me.JSONArray;
import org.json.me.JSONException;
import org.json.me.JSONObject;
import com.rim.samples.device.communicationapidemo.CommunicationController;
import com.rim.samples.device.communicationapidemo.ResponseCallback;
import com.rim.samples.device.communicationapidemo.ui.FullWidthButton;
public final class SendNonBlockJsonScreen extends MainScreen {
private final TreeField _treeField;
private final EditField _uriSenderField;
private final ResponseCallback _callback;
private boolean _pending;
/**
* Creates a new SendNonBlockJsonScreen object
*/
public SendNonBlockJsonScreen(final CommunicationController controller) {
setTitle("JSON");
_callback = new SendNonBlockJsonScreenCallback(this);
_uriSenderField =
new EditField("URI:", CommunicationController.ECHO_SERVER_URI
+ "JSON", 140, 0);
final FullWidthButton postButton = new FullWidthButton("Get Data");
postButton.setChangeListener(new FieldChangeListener() {
/**
* @see FieldChangeListener#fieldChanged(Field, int)
*/
public void fieldChanged(final Field field, final int context) {
if (!_pending) {
_pending = true;
clearTree("* No JSON Message *");
controller.sendNonBlocking(_uriSenderField.getText(), true,
_callback);
} else {
Dialog.alert("Previous request pending state...");
}
}
});
_treeField = new TreeField(new MyTreeFieldCallback(), Field.FOCUSABLE);
_treeField.setDefaultExpanded(false);
clearTree("* No JSON Message *");
add(_uriSenderField);
add(postButton);
add(_treeField);
}
private void updateTree(final Message message) {
if (process(message)) {
displayJsonTree(message);
} else {
clearTree("* No JSON Message *");
}
}
private boolean process(final Message message) {
final JSONMessageProcessor jsonMP = new JSONMessageProcessor();
try {
if (message != null) {
jsonMP.process(message);
}
} catch (final MessageProcessorException mpe) {
Dialog.alert(mpe.toString());
return false;
}
return true;
}
/**
* Display the JSON message as a tree
*/
private void displayJsonTree(final Message message) {
int parentNode = 0;
_treeField.deleteAll();
final Object obj = message.getObjectPayload();
try {
if (obj instanceof JSONArray) {
parentNode =
populateTreeArray(_treeField, (JSONArray) obj,
parentNode);
} else if (obj instanceof JSONObject) {
parentNode =
populateTreeObject(_treeField, (JSONObject) obj,
parentNode);
}
} catch (final JSONException e) {
System.out.println(e.toString());
}
_treeField.setCurrentNode(parentNode);
}
// Populate the trees with JSON arrays
int populateTreeArray(final TreeField tree, final JSONArray o, final int p)
throws JSONException {
Object temp;
int newParent;
newParent = tree.addChildNode(p, "Array " + p);
for (int i = 0; i < o.length(); ++i) {
temp = o.get(i);
if (temp == null || temp.toString().equalsIgnoreCase("null")) {
continue;
}
if (temp instanceof JSONArray) {
// Array of arrays
populateTreeArray(tree, (JSONArray) temp, newParent);
} else if (temp instanceof JSONObject) {
// Array of objects
populateTreeObject(tree, (JSONObject) temp, newParent);
} else { // other values
newParent = tree.addSiblingNode(newParent, temp.toString());
}
}
return newParent;
}
// Populate the tree with JSON objects
int
populateTreeObject(final TreeField tree, final JSONObject o,
final int p) throws JSONException {
Object temp;
final int newParent = tree.addChildNode(p, "Object" + p);
final JSONArray a = o.names();
for (int i = 0; i < a.length(); ++i) {
temp = o.get(a.getString(i));
if (temp == null || temp.toString().equalsIgnoreCase("null")) {
continue;
}
if (temp instanceof JSONArray) {
populateTreeArray(tree, (JSONArray) temp, newParent);
} else if (temp instanceof JSONObject) {
populateTreeObject(tree, (JSONObject) temp, newParent);
} else {
tree.addSiblingNode(newParent, a.getString(i) + ": "
+ temp.toString());
}
}
return newParent;
}
private void clearTree(final String statusString) {
_treeField.deleteAll();
_treeField.setEmptyString(statusString, 0);
}
/**
* @see MainScreen#onSavePrompt()
*/
public boolean onSavePrompt() {
// Suppress the save dialog
return true;
}
private final class MyTreeFieldCallback implements TreeFieldCallback {
/**
* @see TreeFieldCallback#drawTreeItem(TreeField, Graphics, int, int,
* int, int)
*/
public void drawTreeItem(final TreeField treeField,
final Graphics graphics, final int node, final int y,
final int width, final int indent) {
if (treeField == _treeField) {
final Object cookie = _treeField.getCookie(node);
if (cookie instanceof String) {
final String text = (String) cookie;
graphics.drawText(text, indent, y, DrawStyle.ELLIPSIS,
width);
}
}
}
}
private static final class SendNonBlockJsonScreenCallback extends
ResponseCallback {
private final SendNonBlockJsonScreen _screen;
private SendNonBlockJsonScreenCallback(
final SendNonBlockJsonScreen screen) {
_screen = screen;
}
public void onResponse(final Message message) {
if (message != null) {
_screen.updateTree(message);
}
_screen._pending = false;
}
public void onTimeout(final int timeout) {
_screen._pending = false;
final String timeoutMessage =
"Wait for response: timed out after " + timeout + " sec";
Dialog.alert(timeoutMessage);
}
}
}