1 /* 2 * Copyright (C) 2012 Google Inc. 3 * Licensed to The Android Open Source Project. 4 * 5 * Licensed under the Apache License, Version 2.0 (the "License"); 6 * you may not use this file except in compliance with the License. 7 * You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 18 package com.android.mail.browse; 19 20 import com.google.common.collect.Maps; 21 22 import android.content.Context; 23 import android.content.CursorLoader; 24 import android.database.Cursor; 25 import android.database.CursorWrapper; 26 import android.net.Uri; 27 28 import com.android.mail.providers.Attachment; 29 import com.android.mail.providers.UIProvider; 30 31 import java.util.Map; 32 33 public class AttachmentLoader extends CursorLoader { 34 35 public AttachmentLoader(Context c, Uri uri) { 36 super(c, uri, UIProvider.ATTACHMENT_PROJECTION, null, null, null); 37 } 38 39 @Override 40 public Cursor loadInBackground() { 41 return new AttachmentCursor(super.loadInBackground()); 42 } 43 44 public static class AttachmentCursor extends CursorWrapper { 45 46 private Map<String, Attachment> mCache = Maps.newHashMap(); 47 48 private AttachmentCursor(Cursor inner) { 49 super(inner); 50 } 51 52 public Attachment get() { 53 final String uri = getWrappedCursor().getString(UIProvider.ATTACHMENT_URI_COLUMN); 54 Attachment m = mCache.get(uri); 55 if (m == null) { 56 m = new Attachment(this); 57 mCache.put(uri, m); 58 } 59 return m; 60 } 61 } 62 } 63
