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/*
* Copyright (C) 2011 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.browser;
import android.content.ContentResolver;
import android.content.ContentUris;
import android.content.ContentValues;
import android.database.Cursor;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.webkit.WebView;
import com.android.browser.provider.SnapshotProvider.Snapshots;
import java.io.ByteArrayInputStream;
import java.util.Map;
import java.util.zip.GZIPInputStream;
public class SnapshotTab extends Tab {
private static final String LOGTAG = "SnapshotTab";
private long mSnapshotId;
private LoadData mLoadTask;
private WebViewFactory mWebViewFactory;
private int mBackgroundColor;
private long mDateCreated;
private boolean mIsLive;
public SnapshotTab(WebViewController wvcontroller, long snapshotId) {
super(wvcontroller, null, null);
mSnapshotId = snapshotId;
mWebViewFactory = mWebViewController.getWebViewFactory();
WebView web = mWebViewFactory.createWebView(false);
setWebView(web);
loadData();
}
@Override
void putInForeground() {
if (getWebView() == null) {
WebView web = mWebViewFactory.createWebView(false);
if (mBackgroundColor != 0) {
web.setBackgroundColor(mBackgroundColor);
}
setWebView(web);
loadData();
}
super.putInForeground();
}
@Override
void putInBackground() {
if (getWebView() == null) return;
super.putInBackground();
}
void loadData() {
if (mLoadTask == null) {
mLoadTask = new LoadData(this, mContext.getContentResolver());
mLoadTask.execute();
}
}
@Override
void addChildTab(Tab child) {
if (mIsLive) {
super.addChildTab(child);
} else {
throw new IllegalStateException("Snapshot tabs cannot have child tabs!");
}
}
@Override
public boolean isSnapshot() {
return !mIsLive;
}
public long getSnapshotId() {
return mSnapshotId;
}
@Override
public ContentValues createSnapshotValues() {
if (mIsLive) {
return super.createSnapshotValues();
}
return null;
}
@Override
public Bundle saveState() {
if (mIsLive) {
return super.saveState();
}
return null;
}
public long getDateCreated() {
return mDateCreated;
}
@Override
public void loadUrl(String url, Map<String, String> headers) {
if (!mIsLive) {
mIsLive = true;
getWebView().clearViewState();
}
super.loadUrl(url, headers);
}
@Override
public boolean canGoBack() {
return super.canGoBack() || mIsLive;
}
@Override
public boolean canGoForward() {
return mIsLive && super.canGoForward();
}
@Override
public void goBack() {
if (super.canGoBack()) {
super.goBack();
} else {
mIsLive = false;
getWebView().stopLoading();
loadData();
}
}
static class LoadData extends AsyncTask<Void, Void, Cursor> {
static final String[] PROJECTION = new String[] {
Snapshots._ID, // 0
Snapshots.TITLE, // 1
Snapshots.URL, // 2
Snapshots.FAVICON, // 3
Snapshots.VIEWSTATE, // 4
Snapshots.BACKGROUND, // 5
Snapshots.DATE_CREATED, // 6
};
private SnapshotTab mTab;
private ContentResolver mContentResolver;
public LoadData(SnapshotTab t, ContentResolver cr) {
mTab = t;
mContentResolver = cr;
}
@Override
protected Cursor doInBackground(Void... params) {
long id = mTab.mSnapshotId;
Uri uri = ContentUris.withAppendedId(Snapshots.CONTENT_URI, id);
return mContentResolver.query(uri, PROJECTION, null, null, null);
}
@Override
protected void onPostExecute(Cursor result) {
try {
if (result.moveToFirst()) {
mTab.mCurrentState.mTitle = result.getString(1);
mTab.mCurrentState.mUrl = result.getString(2);
byte[] favicon = result.getBlob(3);
if (favicon != null) {
mTab.mCurrentState.mFavicon = BitmapFactory
.decodeByteArray(favicon, 0, favicon.length);
}
WebView web = mTab.getWebView();
if (web != null) {
byte[] data = result.getBlob(4);
ByteArrayInputStream bis = new ByteArrayInputStream(data);
GZIPInputStream stream = new GZIPInputStream(bis);
web.loadViewState(stream);
}
mTab.mBackgroundColor = result.getInt(5);
mTab.mDateCreated = result.getLong(6);
mTab.mWebViewController.onPageFinished(mTab);
}
} catch (Exception e) {
Log.w(LOGTAG, "Failed to load view state, closing tab", e);
mTab.mWebViewController.closeTab(mTab);
} finally {
if (result != null) {
result.close();
}
mTab.mLoadTask = null;
}
}
}
@Override
protected void persistThumbnail() {
if (mIsLive) {
super.persistThumbnail();
}
}
}
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