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chrome/android/java/src/org/chromium/chrome/browser/download/ui/BackendItems.java

Index: chrome/android/java/src/org/chromium/chrome/browser/download/ui/BackendItems.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/download/ui/BackendItems.java b/chrome/android/java/src/org/chromium/chrome/browser/download/ui/BackendItems.java
new file mode 100644
index 0000000000000000000000000000000000000000..35ef89f7375976d658f696ba68696d068f8da48c
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/download/ui/BackendItems.java
@@ -0,0 +1,81 @@
+// Copyright 2016 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.download.ui;
+
+import android.text.TextUtils;
+
+import java.util.ArrayList;
+
+/**
+ * Stores a List of DownloadHistoryItemWrappers for a particular download backend.
+ */
+public abstract class BackendItems extends ArrayList<DownloadHistoryItemWrapper> {
+    /** See {@link #findItemIndex}. */
+    public static final int INVALID_INDEX = -1;
+
+    /** Whether or not the list has been initialized. */
+    private boolean mIsInitialized;
+
+    /**
+     * Determines how many bytes are occupied by completed downloads.
+     * @return Total size of completed downloads in bytes.
+     */
+    public long getTotalBytes() {
+        long totalSize = 0;
+        for (DownloadHistoryItemWrapper item : this) {
+            if (!item.isComplete()) continue;
+            totalSize += item.getFileSize();
+        }
+        return totalSize;
+    }
+
+    /**
+     * Filters out items that are displayed in this list for the current filter.
+     * TODO(dfalcantara): Show all non-cancelled downloads.
+     *
+     * @param filterType    Filter to use.
+     * @param filteredItems List for appending items that match the filter.
+     */
+    public void filter(int filterType, BackendItems filteredItems) {
+        for (DownloadHistoryItemWrapper item : this) {
+            if (!item.isComplete()) continue;
+
+            if (item.getFilterType() == filterType || filterType == DownloadFilter.FILTER_ALL) {
+                filteredItems.add(item);
+            }
+        }
+    }
+
+    /**
+     * Search for an existing entry with the given ID.
+     * @param guid GUID of the entry.
+     * @return The index of the item, or INVALID_INDEX if it couldn't be found.
+     */
+    public int findItemIndex(String guid) {
+        for (int i = 0; i < size(); i++) {
+            if (TextUtils.equals(get(i).getId(), guid)) return i;
+        }
+        return INVALID_INDEX;
+    }
+
+    /**
+     * Removes the item matching the given guid.
+     * @param guid GUID of the download to remove.
+     * @return Item that was removed, or null if the item wasn't found.
+     */
+    public DownloadHistoryItemWrapper removeItem(String guid) {
+        int index = findItemIndex(guid);
+        if (index == INVALID_INDEX) return null;
+        return remove(index);
+    }
+
+    public boolean isInitialized() {
+        return mIsInitialized;
+    }
+
+    public void setIsInitialized() {
+        mIsInitialized = true;
+    }
+}