pt 1 in reviving the android build (copied from pm 28a1, wish me luck)

mobile/android/base/java/org/mozilla/gecko/AboutPages.java

@@ -0,0 +1,117 @@
+/* -*- Mode: Java; c-basic-offset: 4; tab-width: 4; indent-tabs-mode: nil; -*-
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+package org.mozilla.gecko;
+
+import org.mozilla.gecko.annotation.RobocopTarget;
+import org.mozilla.gecko.home.HomeConfig;
+import org.mozilla.gecko.home.HomeConfig.PanelType;
+import org.mozilla.gecko.util.StringUtils;
+
+public class AboutPages {
+    // All of our special pages.
+    public static final String ACCOUNTS        = "about:accounts";
+    public static final String ADDONS          = "about:addons";
+    public static final String CONFIG          = "about:config";
+    public static final String DOWNLOADS       = "about:downloads";
+    public static final String FIREFOX         = "about:firefox";
+    public static final String HEALTHREPORT    = "about:healthreport";
+    public static final String HOME            = "about:home";
+    public static final String LOGINS          = "about:logins";
+    public static final String PRIVATEBROWSING = "about:privatebrowsing";
+    public static final String READER          = "about:reader";
+    public static final String UPDATER         = "about:";
+
+    public static final String URL_FILTER = "about:%";
+
+    public static final String PANEL_PARAM = "panel";
+
+    public static final boolean isAboutPage(final String url) {
+        return url != null && url.startsWith("about:");
+    }
+
+    public static final boolean isTitlelessAboutPage(final String url) {
+        return isAboutHome(url) ||
+               PRIVATEBROWSING.equals(url);
+    }
+
+    public static final boolean isAboutHome(final String url) {
+        if (url == null || !url.startsWith(HOME)) {
+            return false;
+        }
+        // We sometimes append a parameter to "about:home" to specify which page to
+        // show when we open the home pager. Discard this parameter when checking
+        // whether or not this URL is "about:home".
+        return HOME.equals(url.split("\\?")[0]);
+    }
+
+    public static final String getPanelIdFromAboutHomeUrl(String aboutHomeUrl) {
+        return StringUtils.getQueryParameter(aboutHomeUrl, PANEL_PARAM);
+    }
+
+    public static boolean isAboutReader(final String url) {
+        return isAboutPage(READER, url);
+    }
+
+    public static boolean isAboutConfig(final String url) {
+        return isAboutPage(CONFIG, url);
+    }
+
+    public static boolean isAboutAddons(final String url) {
+        return isAboutPage(ADDONS, url);
+    }
+
+    public static boolean isAboutPrivateBrowsing(final String url) {
+        return isAboutPage(PRIVATEBROWSING, url);
+    }
+
+    public static boolean isAboutPage(String page, String url) {
+        return url != null && url.toLowerCase().startsWith(page);
+
+    }
+
+    public static final String[] DEFAULT_ICON_PAGES = new String[] {
+        HOME,
+        ACCOUNTS,
+        ADDONS,
+        CONFIG,
+        DOWNLOADS,
+        FIREFOX,
+        HEALTHREPORT,
+        UPDATER
+    };
+
+    public static boolean isBuiltinIconPage(final String url) {
+        if (url == null ||
+            !url.startsWith("about:")) {
+            return false;
+        }
+
+        // about:home uses a separate search built-in icon.
+        if (isAboutHome(url)) {
+            return true;
+        }
+
+        // TODO: it'd be quicker to not compare the "about:" part every time.
+        for (int i = 0; i < DEFAULT_ICON_PAGES.length; ++i) {
+            if (DEFAULT_ICON_PAGES[i].equals(url)) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    /**
+     * Get a URL that navigates to the specified built-in Home Panel.
+     *
+     * @param panelType to navigate to.
+     * @return URL.
+     * @throws IllegalArgumentException if the built-in panel type is not a built-in panel.
+     */
+    @RobocopTarget
+    public static String getURLForBuiltinPanelType(PanelType panelType) throws IllegalArgumentException {
+        return HOME + "?panel=" + HomeConfig.getIdForBuiltinPanelType(panelType);
+    }
+}