[Offline pages] Removing offline pages from Bookmarks UI

chrome/android/java/src/org/chromium/chrome/browser/offlinepages/OfflinePageStorageSpacePolicy.java

-// 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.offlinepages;
-
-import org.chromium.base.Callback;
-
-import java.util.List;
-
-/**
- * Manages the storage space policy for offline pages.
- *
- * When created, it records the size on disk that is being used, this value never changes after
- * creation so make a new OfflinePageStorageSpacePolicy whenever a new measurement is desired.
- */
-public class OfflinePageStorageSpacePolicy {
-    /**
-     * Minimal total size of all pages, before a header will be shown to offer freeing up space.
-     */
-    private static final long MINIMUM_TOTAL_SIZE_BYTES = 10 * (1 << 20); // 10MB
-    /**
-     * Minimal size of pages to clean up, before a header will be shown to offer freeing up space.
-     */
-    private static final long MINIMUM_CLEANUP_SIZE_BYTES = 5 * (1 << 20); // 5MB
-
-    private long mSizeOfAllPages;
-    private long mSizeOfPagesToCleanUp;
-
-    /**
-     * Asynchronously creates an OffinePageStorageSpacePolicy which is prefilled with information
-     * about the state of the disk usage of Offline Pages.
-     */
-    public static void create(final OfflinePageBridge offlinePageBridge,
-            final Callback<OfflinePageStorageSpacePolicy> callback) {
-        assert offlinePageBridge != null;
-        offlinePageBridge.getAllPages(new OfflinePageBridge.MultipleOfflinePageItemCallback() {
-            @Override
-            public void onResult(List<OfflinePageItem> allPages) {
-                callback.onResult(new OfflinePageStorageSpacePolicy(offlinePageBridge, allPages));
-            }
-        });
-    }
-
-    /**
-     * Creates a policy object with the given list of offline pages.
-     *
-     * @param offlinePageBridge An object to access offline page functionality.
-     * @param offlinePages The list of all offline pages.
-     */
-    private OfflinePageStorageSpacePolicy(
-            OfflinePageBridge offlinePageBridge, List<OfflinePageItem> offlinePages) {
-        mSizeOfAllPages = getTotalSize(offlinePages);
-        mSizeOfPagesToCleanUp = getTotalSize(offlinePageBridge.getPagesToCleanUp());
-    }
-
-    /** @return Whether there exists offline pages that could be cleaned up to make space. */
-    public boolean hasPagesToCleanUp() {
-        return mSizeOfPagesToCleanUp > 0;
-    }
-
-    /**
-     * @return Whether the header should be shown in saved pages view to inform user of total used
-     * storage and offer freeing up space.
-     */
-    public boolean shouldShowStorageSpaceHeader() {
-        return getSizeOfAllPages() > MINIMUM_TOTAL_SIZE_BYTES
-                && getSizeOfPagesToCleanUp() > MINIMUM_CLEANUP_SIZE_BYTES;
-    }
-
-    /** @return Total size, in bytes, of all saved pages. */
-    public long getSizeOfAllPages() {
-        return mSizeOfAllPages;
-    }
-
-    private long getSizeOfPagesToCleanUp() {
-        return mSizeOfPagesToCleanUp;
-    }
-
-    private long getTotalSize(List<OfflinePageItem> offlinePages) {
-        long totalSize = 0;
-        for (OfflinePageItem page : offlinePages) {
-            totalSize += page.getFileSize();
-        }
-        return totalSize;
-    }
-}