/**
* Copyright 2010 Google Inc.
*
* 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 org.waveprotocol.wave.client.gadget.renderer;
import com.google.gwt.json.client.JSONBoolean;
import com.google.gwt.json.client.JSONNumber;
import com.google.gwt.json.client.JSONObject;
import com.google.gwt.json.client.JSONString;
import com.google.gwt.json.client.JSONValue;
import org.waveprotocol.wave.client.gadget.StateMap;
import org.waveprotocol.wave.model.util.CollectionUtils;
import org.waveprotocol.wave.model.util.ReadableStringSet;
import org.waveprotocol.wave.model.util.StringMap;
/**
* Gadget metadata container and parser class.
*
* TODO(user): Replace gwt JSON classes with either overlay types or other
* lightweight alternative.
*
* TODO(davidbyttow): Reduce this class to just metadata and pull some of the
* data into a single GadgetData class used by Gadget widgets.
*
* TODO(davidbyttow): Unit tests.
*
* TODO(davidbyttow): Factor out the parsing code, possibly use GWT javascript
* objects instead.
*
*/
public class GadgetMetadata {
/** Gadget View info. */
/** Metadata fields. */
private String iframeUrl;
private String url;
private String moduleId;
private String title;
private String titleUrl;
private String directoryTitle;
private String thumbnail;
private String screenshot;
private String author;
private String authorEmail;
private Long height;
private Long width;
private Boolean scrolling;
/** Gadget View info. */
private final StringMap<View> views = CollectionUtils.createStringMap();
/**
* Encapsulates gadget view information.
*/
private static class View {
private String type;
private Long preferredHeight;
private Long preferredWidth;
}
/** User Prefs object. */
private final GadgetUserPrefs userPrefs = GadgetUserPrefs.create();
/**
* Constructs the object from metadata JSON.
*
* @param metadataJson JSON object to extract the data from.
*/
public GadgetMetadata(JSONObject metadataJson) {
parse(metadataJson);
}
/**
* Helper function to extract a string value from given JSON object.
*
* @param json JSON object to extract the value from.
* @param key key of the value to extract.
* @return the string object extracted from JSON (can be null if the value
* does not exist or is invalid.
*/
private static String getJsonStringValue(JSONObject json, String key) {
JSONValue value = json.get(key);
JSONString string = (value == null) ? null : value.isString();
if (string != null) {
return string.stringValue();
} else {
return null;
}
}
/**
* Helper function to extract a long value from given JSON object.
*
* @param json JSON object to extract the value from.
* @param key key of the value to extract.
* @return the Long object extracted from JSON (can be null if the value does
* not exist or is invalid.
*/
private static Long getJsonLongValue(JSONObject json, String key) {
JSONValue value = json.get(key);
JSONNumber number = (value == null) ? null : value.isNumber();
if (number != null) {
return Math.round(number.doubleValue());
} else {
return null;
}
}
/**
* Helper function to extract a boolean value from given JSON object.
*
* @param json JSON object to extract the value from.
* @param key key of the value to extract.
* @return the Boolean object extracted from JSON (can be null if the value
* does not exist or is invalid.
*/
private static Boolean getJsonBooleanValue(JSONObject json, String key) {
JSONValue value = json.get(key);
JSONBoolean bool = (value == null) ? null : value.isBoolean();
if (bool != null) {
return bool.booleanValue();
} else {
return null;
}
}
/**
* Helper function to extract a JSONObject from a JSONValue if it exists.
*
* @param json JSON object to extract the value from.
* @param key key of the value to extract.
* @return the JSONObject if it exists.
*/
private static JSONObject getJsonObjectValue(JSONObject json, String key) {
JSONValue value = json.get(key);
return (value != null) ? value.isObject() : null;
}
/**
* Parses JSON object to extract metadata information.
*
* @param gadget JSON object returned in the gadget field from the server.
*/
public void parse(JSONObject gadget) {
iframeUrl = getJsonStringValue(gadget, "iframeUrl");
// Get rid of the protocol as we should rely on the browser to do the right
// thing with "//" as the beginning of the url.
// By doing this it also works around an issue in shindig where it shouldn't
// put "//" in front of "http://" see:
// https://issues.apache.org/jira/browse/SHINDIG-1460?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12928110#action_12928110
// This work around may no longer be needed on the next version of shindig
// Added null check on iframeUrl.Issue #166:Client shiny on broken gadget.
if(iframeUrl != null) {
iframeUrl = iframeUrl.replaceFirst("^//http[s]?://", "//");
}
url = getJsonStringValue(gadget, "url");
moduleId = getJsonStringValue(gadget, "moduleId");
title = getJsonStringValue(gadget, "title");
titleUrl = getJsonStringValue(gadget, "titleUrl");
directoryTitle = getJsonStringValue(gadget, "directoryTitle");
thumbnail = getJsonStringValue(gadget, "thumbnail");
screenshot = getJsonStringValue(gadget, "screenshot");
author = getJsonStringValue(gadget, "author");
authorEmail = getJsonStringValue(gadget, "authorEmail");
height = getJsonLongValue(gadget, "height");
width = getJsonLongValue(gadget, "width");
scrolling = getJsonBooleanValue(gadget, "scrolling");
// Added null check on gadget.get("userPrefs").Issue #166:Client shiny on broken gadget.
if(gadget.get("userPrefs") != null) {
userPrefs.parseDefaultValues(gadget.get("userPrefs").isObject());
}
JSONObject gadgetViews = getJsonObjectValue(gadget, "views");
if (gadgetViews != null) {
View lastView = null;
for (String viewName : gadgetViews.keySet()) {
JSONObject viewJson = gadgetViews.get(viewName).isObject();
View v = new View();
v.type = viewName;
v.preferredHeight = getJsonLongValue(viewJson, "preferredHeight");
v.preferredWidth = getJsonLongValue(viewJson, "preferredWidth");
views.put(v.type, v);
lastView = v;
}
}
}
/** Metadata field accessors. */
public boolean hasView(String view) {
return views.containsKey(view);
}
public String getIframeUrl(String view) {
return iframeUrl;
}
public boolean hasPreferredWidth(String view) {
View v = views.get(view);
return v != null && v.preferredWidth != null;
}
public long getPreferredWidth(String view) {
View v = views.get(view);
if (v == null) {
return 0;
}
return v.preferredWidth;
}
public boolean hasPreferredHeight(String view) {
View v = views.get(view);
return v != null && v.preferredHeight != null;
}
public long getPreferredHeight(String view) {
View v = views.get(view);
if (v == null) {
return 0;
}
return v.preferredHeight;
}
public boolean hasIframeUrl() {
return iframeUrl != null;
}
public String getIframeUrl() {
return iframeUrl;
}
public boolean hasUrl() {
return url != null;
}
public String getUrl() {
return url;
}
public boolean hasModuleId() {
return moduleId != null;
}
public String getModuleId() {
return moduleId;
}
public boolean hasTitle() {
return title != null;
}
public String getTitle() {
return title;
}
public boolean hasTitleUrl() {
return titleUrl != null;
}
public String getTitleUrl() {
return titleUrl;
}
public boolean hasHeight() {
return height != null;
}
public long getHeight() {
return height;
}
public boolean hasWidth() {
return width != null;
}
public long getWidth() {
return width;
}
public boolean hasScrolling() {
return scrolling != null;
}
public Boolean getScrolling() {
return scrolling;
}
public boolean hasDirectoryTitle() {
return directoryTitle != null;
}
public String getDirectoryTitle() {
return directoryTitle;
}
public boolean hasThumbnail() {
return thumbnail != null;
}
public String getThumbnail() {
return thumbnail;
}
public boolean hasAuthor() {
return author != null;
}
public String getAuthor() {
return author;
}
public boolean hasAuthorEmail() {
return authorEmail != null;
}
public String getAuthorEmail() {
return authorEmail;
}
public boolean hasScreenshot() {
return screenshot != null;
}
public String getScreenshot() {
return screenshot;
}
public StateMap getUserPrefs() {
return userPrefs;
}
/**
* @returns Set of views implemented by the gadget.
*/
public ReadableStringSet getViewSet() {
return views.keySet();
}
}