Upstream DocumentTabModelImpl and related classes

chrome/android/java/src/org/chromium/chrome/browser/tabmodel/document/ActivityDelegate.java

Index: chrome/android/java/src/org/chromium/chrome/browser/tabmodel/document/ActivityDelegate.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/tabmodel/document/ActivityDelegate.java b/chrome/android/java/src/org/chromium/chrome/browser/tabmodel/document/ActivityDelegate.java
new file mode 100644
index 0000000000000000000000000000000000000000..61d3ac583512d4bb2d436521bd6cc21a0ef5a0ff
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/tabmodel/document/ActivityDelegate.java
@@ -0,0 +1,151 @@
+// Copyright 2014 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.tabmodel.document;
+
+import android.annotation.TargetApi;
+import android.app.ActivityManager;
+import android.content.Context;
+import android.content.Intent;
+import android.content.pm.PackageManager;
+import android.content.pm.ResolveInfo;
+import android.net.Uri;
+import android.os.Build;
+import android.text.TextUtils;
+
+import org.chromium.base.ApplicationStatus;
+import org.chromium.chrome.browser.Tab;
+import org.chromium.chrome.browser.UrlConstants;
+import org.chromium.chrome.browser.tabmodel.document.DocumentTabModel.Entry;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Interfaces with the ActivityManager to identify Tabs/Tasks that are being tracked by
+ * Android's Recents list.
+ */
+@TargetApi(Build.VERSION_CODES.LOLLIPOP)
+public class ActivityDelegate {
+    private final String mRegularActivityName;
+    private final String mIncognitoActivityName;
+
+    /**
+     * Creates a ActivityDelegate.
+     * @param regularName Name of the regular DocumentActivity.
+     * @param incognitoName Name of the Incognito DocumentActivity.
+     */
+    public ActivityDelegate(String regularName, String incognitoName) {
+        mRegularActivityName = regularName;
+        mIncognitoActivityName = incognitoName;
+    }
+
+    /**
+     * Checks whether or not the Intent corresponds to an Activity that should be tracked.
+     * @param isIncognito Whether or not the TabModel is managing incognito tabs.
+     * @param intent Intent used to launch the Activity.
+     * @return Whether or not to track the Activity.
+     */
+    public boolean isValidActivity(boolean isIncognito, Intent intent) {
+        if (intent == null) return false;
+        String desiredClassName = isIncognito ? mIncognitoActivityName : mRegularActivityName;
+        String className = null;
+        if (intent.getComponent() == null) {
+            Context context = ApplicationStatus.getApplicationContext();
+            PackageManager pm = context.getPackageManager();
+            ResolveInfo resolveInfo = pm.resolveActivity(intent, 0);
+            if (resolveInfo != null) className = resolveInfo.activityInfo.name;
+        } else {
+            className = intent.getComponent().getClassName();
+        }
+
+        return TextUtils.equals(className, desiredClassName);
+    }
+
+    /**
+     * Get a map of the Chrome tasks displayed by Android's Recents.
+     * @param isIncognito Whether or not the TabList is managing incognito tabs.
+     */
+    public List<Entry> getTasksFromRecents(boolean isIncognito) {
+        List<Entry> entries = new ArrayList<Entry>();
+        Context context = ApplicationStatus.getApplicationContext();
+        ActivityManager activityManager =
+                (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
+        for (ActivityManager.AppTask task : activityManager.getAppTasks()) {
+            Intent intent = task.getTaskInfo().baseIntent;
+            if (!isValidActivity(isIncognito, intent)) continue;
+
+            int tabId = getTabIdFromIntent(intent);
+            String initialUrl = getInitialUrlForDocument(intent);
+            if (tabId == Tab.INVALID_TAB_ID || initialUrl == null) continue;
+            entries.add(new Entry(tabId, initialUrl));
+        }
+        return entries;
+    }
+
+    /**
+     * Moves the given task to the front, if it exists.
+     * @param isIncognito Whether or not the TabList is managing incognito tabs.
+     * @param tabId ID of the tab to move to front.
+     */
+    public void moveTaskToFront(boolean isIncognito, int tabId) {
+        ActivityManager.AppTask task = getTask(isIncognito, tabId);
+        if (task != null) task.moveToFront();
+    }
+
+    /**
+     * Finishes and removes the task.
+     * @param isIncognito Whether or not the TabList is managing incognito tabs.
+     * @param tabId ID of the tab to move to front.
+     */
+    public void finishAndRemoveTask(boolean isIncognito, int tabId) {
+        ActivityManager.AppTask task = getTask(isIncognito, tabId);
+        if (task != null) task.finishAndRemoveTask();
+    }
+
+    private final ActivityManager.AppTask getTask(boolean isIncognito, int tabId) {
+        Context context = ApplicationStatus.getApplicationContext();
+        ActivityManager activityManager =
+                (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
+        for (ActivityManager.AppTask task : activityManager.getAppTasks()) {
+            Intent intent = task.getTaskInfo().baseIntent;
+            int taskId = getTabIdFromIntent(intent);
+            if (taskId == tabId && isValidActivity(isIncognito, intent)) return task;
+        }
+        return null;
+    }
+
+    /**
+     * Check whether or not the Intent contains an ID for document mode.
+     * @param intent Intent to check.
+     * @return ID for the document that has the given intent as base intent, or
+     *         {@link Tab.INVALID_TAB_ID} if it couldn't be retrieved.
+     */
+    public static int getTabIdFromIntent(Intent intent) {
+        if (intent == null || intent.getData() == null) return Tab.INVALID_TAB_ID;
+
+        Uri data = intent.getData();
+        if (!TextUtils.equals(data.getScheme(), UrlConstants.DOCUMENT_SCHEME)) {
+            return Tab.INVALID_TAB_ID;
+        }
+
+        try {
+            return Integer.parseInt(data.getHost());
+        } catch (NumberFormatException e) {
+            return Tab.INVALID_TAB_ID;
+        }
+    }
+
+    /**
+     * Parse out the URL for a document Intent.
+     * @param intent Intent to check.
+     * @return The URL that the Intent was fired to display, or null if it couldn't be retrieved.
+     */
+    public static String getInitialUrlForDocument(Intent intent) {
+        if (intent == null || intent.getData() == null) return null;
+        Uri data = intent.getData();
+        return TextUtils.equals(data.getScheme(), UrlConstants.DOCUMENT_SCHEME)
+                ? data.getQuery() : null;
+    }
+}