Upstream partner customizations.

chrome/android/java/src/org/chromium/chrome/browser/partnercustomizations/HomepageManager.java

Index: chrome/android/java/src/org/chromium/chrome/browser/partnercustomizations/HomepageManager.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/partnercustomizations/HomepageManager.java b/chrome/android/java/src/org/chromium/chrome/browser/partnercustomizations/HomepageManager.java
new file mode 100644
index 0000000000000000000000000000000000000000..5d8a60cbd1c10f3798b25055ef21fda635dd86a9
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+++ b/chrome/android/java/src/org/chromium/chrome/browser/partnercustomizations/HomepageManager.java
@@ -0,0 +1,159 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.chrome.browser.partnercustomizations;
+
+import android.content.Context;
+import android.content.SharedPreferences;
+import android.preference.PreferenceManager;
+import android.text.TextUtils;
+
+import org.chromium.base.ObserverList;
+
+/**
+ * Provides information regarding homepage enabled states and URI.
+ *
+ * This class serves as a single homepage logic gateway.
+ */
+public class HomepageManager {
+
+    /**
+     * An interface to use for getting homepage related updates.
+     */
+    public interface HomepageStateListener {
+        /**
+         * Called when the homepage is enabled or disabled or the homepage URL changes.
+         */
+        void onHomepageStateUpdated();
+    }
+
+    private static final String PREF_HOMEPAGE_ENABLED = "homepage";
+    private static final String PREF_HOMEPAGE_CUSTOM_URI = "homepage_custom_uri";
+    private static final String PREF_HOMEPAGE_USE_DEFAULT_URI = "homepage_partner_enabled";
+
+    private static HomepageManager sInstance;
+
+    private final SharedPreferences mSharedPreferences;
+    private final ObserverList<HomepageStateListener> mHomepageStateListeners;
+
+    private HomepageManager(Context context) {
+        mSharedPreferences = PreferenceManager.getDefaultSharedPreferences(context);
+        mHomepageStateListeners = new ObserverList<HomepageManager.HomepageStateListener>();
+    }
+
+    /**
+     * Returns the singleton instance of HomepageManager, creating it if needed.
+     * @param context Any old Context.
+     */
+    public static HomepageManager getInstance(Context context) {
+        if (sInstance == null) {
+            sInstance = new HomepageManager(context);
+        }
+        return sInstance;
+    }
+
+    /**
+     * Adds a HomepageStateListener to receive updates when the homepage state changes.
+     */
+    public void addListener(HomepageStateListener listener) {
+        mHomepageStateListeners.addObserver(listener);
+    }
+
+    /**
+     * Removes the given listener from the state listener list.
+     * @param listener The listener to remove.
+     */
+    public void removeListener(HomepageStateListener listener) {
+        mHomepageStateListeners.removeObserver(listener);
+    }
+
+    /**
+     * Notify any listeners about a homepage state change.
+     */
+    public void notifyHomepageUpdated() {
+        for (HomepageStateListener listener : mHomepageStateListeners) {
+            listener.onHomepageStateUpdated();
+        }
+    }
+
+    /**
+     * @return Whether or not homepage is enabled.
+     */
+    public static boolean isHomepageEnabled(Context context) {
+        return PartnerBrowserCustomizations.isHomepageProviderAvailableAndEnabled()
+                && getInstance(context).getPrefHomepageEnabled();
+    }
+
+    /**
+     * @return Whether or not homepage setting should be shown.
+     */
+    public static boolean shouldShowHomepageSetting() {
+        return PartnerBrowserCustomizations.isHomepageProviderAvailableAndEnabled();
+    }
+
+    /**
+     * @return Homepage URI string, if it's enabled. Null otherwise or uninitialized.
+     */
+    public static String getHomepageUri(Context context) {
+        if (!isHomepageEnabled(context)) return null;
+
+        HomepageManager manager = getInstance(context);
+        String homepageUri = manager.getPrefHomepageUseDefaultUri()
+                ? PartnerBrowserCustomizations.getHomePageUrl()
+                : manager.getPrefHomepageCustomUri();
+        return TextUtils.isEmpty(homepageUri) ? null : homepageUri;
+    }
+
+    /**
+     * Returns the user preference for whether the homepage is enabled. This doesn't take into
+     * account whether the device supports having a homepage.
+     *
+     * @see #isHomepageEnabled
+     */
+    public boolean getPrefHomepageEnabled() {
+        return mSharedPreferences.getBoolean(PREF_HOMEPAGE_ENABLED, true);
+    }
+
+    /**
+     * Sets the user preference for whether the homepage is enabled.
+     */
+    public void setPrefHomepageEnabled(boolean enabled) {
+        SharedPreferences.Editor sharedPreferencesEditor = mSharedPreferences.edit();
+        sharedPreferencesEditor.putBoolean(PREF_HOMEPAGE_ENABLED, enabled);
+        sharedPreferencesEditor.apply();
+        notifyHomepageUpdated();
+    }
+
+    /**
+     * @return User specified homepage custom URI string.
+     */
+    public String getPrefHomepageCustomUri() {
+        return mSharedPreferences.getString(PREF_HOMEPAGE_CUSTOM_URI, "");
+    }
+
+    /**
+     * Sets custom homepage URI
+     */
+    public void setPrefHomepageCustomUri(String customUri) {
+        SharedPreferences.Editor sharedPreferencesEditor = mSharedPreferences.edit();
+        sharedPreferencesEditor.putString(PREF_HOMEPAGE_CUSTOM_URI, customUri);
+        sharedPreferencesEditor.apply();
+    }
+
+    /**
+     * @return Whether the homepage URL is the default value.
+     */
+    public boolean getPrefHomepageUseDefaultUri() {
+        return mSharedPreferences.getBoolean(PREF_HOMEPAGE_USE_DEFAULT_URI, true);
+    }
+
+    /**
+     * Sets whether the homepage URL is the default value.
+     */
+    public void setPrefHomepageUseDefaultUri(boolean useDefaultUri) {
+        SharedPreferences.Editor sharedPreferencesEditor = mSharedPreferences.edit();
+        sharedPreferencesEditor.putBoolean(PREF_HOMEPAGE_USE_DEFAULT_URI, useDefaultUri);
+        sharedPreferencesEditor.apply();
+    }
+}