87 lines
2.9 KiB
Java
87 lines
2.9 KiB
Java
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/*
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* Copyright (C) 2008 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.email.provider;
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import android.content.ContentUris;
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import android.content.ContentValues;
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import android.content.Context;
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import android.database.Cursor;
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import android.net.Uri;
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public abstract class EmailContent {
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// Newly created objects get this id
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public static final int NOT_SAVED = -1;
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// The base Uri that this piece of content came from
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public Uri baseUri;
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// Lazily initialized uri for this Content
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Uri uri = null;
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// The id of the Content
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public long _id = NOT_SAVED;
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// Write the Content into a ContentValues container
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public abstract ContentValues toContentValues();
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// Read the Content from a ContentCursor
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public abstract <T extends EmailContent> T restore (Cursor cursor);
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// The Uri is lazily initialized
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public Uri getUri() {
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if (uri == null)
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uri = ContentUris.withAppendedId(baseUri, _id);
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return uri;
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}
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public boolean isSaved() {
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return _id != NOT_SAVED;
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}
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@SuppressWarnings("unchecked")
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// The Content sub class must have a no-arg constructor
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static public <T extends EmailContent> T getContent(Cursor cursor, Class<T> klass) {
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try {
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T content = klass.newInstance();
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content._id = cursor.getLong(0);
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return (T)content.restore(cursor);
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} catch (IllegalAccessException e) {
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e.printStackTrace();
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} catch (InstantiationException e) {
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e.printStackTrace();
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}
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return null;
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}
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// Convenience method that saves or updates some Content
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public Uri saveOrUpdate(Context context) {
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if (!isSaved())
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return context.getContentResolver().insert(baseUri, toContentValues());
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else {
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if (update(context, toContentValues()) == 1)
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return getUri();
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return null;
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}
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}
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public Uri save(Context context) {
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Uri res = context.getContentResolver().insert(baseUri, toContentValues());
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_id = Long.parseLong(res.getPathSegments().get(1));
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return res;
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}
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public int update(Context context, ContentValues contentValues) {
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return context.getContentResolver().update(getUri(), contentValues, null, null);
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}
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}
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