Merge "Reduce memory allocations and improve sorting in DocumentsUI by 8.42%." into nyc-dev

import static com.android.documentsui.State.SORT_ORDER_SIZE;

import android.database.Cursor;

import android.database.MergeCursor;

import android.os.Bundle;

import android.provider.DocumentsContract;

import android.provider.DocumentsContract.Document;

    @Nullable String error;

    @Nullable DocumentInfo doc;

    /**

     * Generates a Model ID for a cursor entry that refers to a document. The Model ID is a unique

     * string that can be used to identify the document referred to by the cursor.

     *

     * @param c A cursor that refers to a document.

     */

    static String createModelId(String authority, String docId) {

        return authority + "|" + docId;

    }

    private void notifyUpdateListeners() {

        for (UpdateListener listener: mUpdateListeners) {

            listener.onModelUpdate(this);

            // Generates a Model ID for a cursor entry that refers to a document. The Model ID is a

            // unique string that can be used to identify the document referred to by the cursor.

            mIds[pos] = createModelId(getString(mAuthorityIndex), getString(mDocIdIndex));

            // If the cursor is a merged cursor over multiple authorities, then prefix the ids

            // with the authority to avoid collisions.

            if (mCursor instanceof MergeCursor) {

                mIds[pos] = getString(mAuthorityIndex) + "|" + mCursor.getString(mDocIdIndex);

            } else {

                mIds[pos] = mCursor.getString(mDocIdIndex);

            }

            mimeType = getString(mMimeTypeIndex);

            isDirs[pos] = Document.MIME_TYPE_DIR.equals(mimeType);

            String id = Integer.toString(i);

            row.add(RootCursorWrapper.COLUMN_AUTHORITY, AUTHORITY);

            row.add(Document.COLUMN_DOCUMENT_ID, id);

            currentDownloads.add(Model.createModelId(AUTHORITY, id));

            currentDownloads.add(id);

        }

        DirectoryResult r = new DirectoryResult();

        update(r);

    }

    // Note that model id includes authority qualifier and is distinct

    // WRT documentId because of this.

    String idForPosition(int p) {

        return createModelId(mAuthority, Integer.toString(p));

        return Integer.toString(p);

    }

}