| /* |
| * Copyright (C) 2014 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.android.email.provider; |
| |
| import android.content.ContentResolver; |
| import android.content.Context; |
| import android.database.Cursor; |
| import android.database.CursorWrapper; |
| import android.net.Uri; |
| import android.provider.BaseColumns; |
| import android.util.SparseArray; |
| |
| import com.android.emailcommon.provider.EmailContent.Body; |
| import com.android.mail.utils.HtmlSanitizer; |
| import com.android.mail.utils.LogUtils; |
| |
| import org.apache.commons.io.IOUtils; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| |
| /** |
| * This class wraps a cursor for the purpose of bypassing the CursorWindow object for the |
| * potentially over-sized body content fields. The CursorWindow has a hard limit of 2MB and so a |
| * large email message can exceed that limit and cause the cursor to fail to load. |
| * |
| * To get around this, we load null values in those columns, and then in this wrapper we directly |
| * load the content from the provider, skipping the cursor window. |
| * |
| * This will still potentially blow up if this cursor gets wrapped in a CrossProcessCursorWrapper |
| * which uses a CursorWindow to shuffle results between processes. Since we're only using this for |
| * passing a cursor back to UnifiedEmail this shouldn't be an issue. |
| */ |
| public class EmailMessageCursor extends CursorWrapper { |
| |
| private final SparseArray<String> mTextParts; |
| private final SparseArray<String> mHtmlParts; |
| private final int mTextColumnIndex; |
| private final int mHtmlColumnIndex; |
| |
| public EmailMessageCursor(final Context c, final Cursor cursor, final String htmlColumn, |
| final String textColumn) { |
| super(cursor); |
| mHtmlColumnIndex = cursor.getColumnIndex(htmlColumn); |
| mTextColumnIndex = cursor.getColumnIndex(textColumn); |
| final int cursorSize = cursor.getCount(); |
| mHtmlParts = new SparseArray<String>(cursorSize); |
| mTextParts = new SparseArray<String>(cursorSize); |
| |
| final ContentResolver cr = c.getContentResolver(); |
| |
| while (cursor.moveToNext()) { |
| final int position = cursor.getPosition(); |
| final long messageId = cursor.getLong(cursor.getColumnIndex(BaseColumns._ID)); |
| try { |
| if (mHtmlColumnIndex != -1) { |
| final Uri htmlUri = Body.getBodyHtmlUriForMessageWithId(messageId); |
| final InputStream in = cr.openInputStream(htmlUri); |
| final String underlyingHtmlString; |
| try { |
| underlyingHtmlString = IOUtils.toString(in); |
| } finally { |
| in.close(); |
| } |
| final String sanitizedHtml = HtmlSanitizer.sanitizeHtml(underlyingHtmlString); |
| mHtmlParts.put(position, sanitizedHtml); |
| } |
| } catch (final IOException e) { |
| LogUtils.v(LogUtils.TAG, e, "Did not find html body for message %d", messageId); |
| } |
| try { |
| if (mTextColumnIndex != -1) { |
| final Uri textUri = Body.getBodyTextUriForMessageWithId(messageId); |
| final InputStream in = cr.openInputStream(textUri); |
| final String underlyingTextString; |
| try { |
| underlyingTextString = IOUtils.toString(in); |
| } finally { |
| in.close(); |
| } |
| mTextParts.put(position, underlyingTextString); |
| } |
| } catch (final IOException e) { |
| LogUtils.v(LogUtils.TAG, e, "Did not find text body for message %d", messageId); |
| } |
| } |
| cursor.moveToPosition(-1); |
| } |
| |
| @Override |
| public String getString(final int columnIndex) { |
| if (columnIndex == mHtmlColumnIndex) { |
| return mHtmlParts.get(getPosition()); |
| } else if (columnIndex == mTextColumnIndex) { |
| return mTextParts.get(getPosition()); |
| } |
| return super.getString(columnIndex); |
| } |
| |
| @Override |
| public int getType(int columnIndex) { |
| if (columnIndex == mHtmlColumnIndex || columnIndex == mTextColumnIndex) { |
| // Need to force this, otherwise we might fall through to some other get*() method |
| // instead of getString() if the underlying cursor has other ideas about this content |
| return FIELD_TYPE_STRING; |
| } else { |
| return super.getType(columnIndex); |
| } |
| } |
| } |