323 lines
11 KiB
Java
323 lines
11 KiB
Java
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/*
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* Copyright (C) 2006 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 android.webkit;
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import android.content.ContentResolver;
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import android.database.Cursor;
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import android.graphics.Bitmap;
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import android.os.Handler;
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import android.os.Message;
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import android.provider.Browser;
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import android.util.Log;
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import java.io.File;
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import java.util.HashMap;
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import java.util.Vector;
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/**
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* Functions for manipulating the icon database used by WebView.
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* These functions require that a WebView be constructed before being invoked
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* and WebView.getIconDatabase() will return a WebIconDatabase object. This
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* WebIconDatabase object is a single instance and all methods operate on that
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* single object.
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*/
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public final class WebIconDatabase {
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private static final String LOGTAG = "WebIconDatabase";
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// Global instance of a WebIconDatabase
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private static WebIconDatabase sIconDatabase;
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// EventHandler for handling messages before and after the WebCore thread is
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// ready.
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private final EventHandler mEventHandler = new EventHandler();
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// Class to handle messages before WebCore is ready
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private static class EventHandler extends Handler {
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// Message ids
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static final int OPEN = 0;
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static final int CLOSE = 1;
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static final int REMOVE_ALL = 2;
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static final int REQUEST_ICON = 3;
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static final int RETAIN_ICON = 4;
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static final int RELEASE_ICON = 5;
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static final int BULK_REQUEST_ICON = 6;
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// Message for dispatching icon request results
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private static final int ICON_RESULT = 10;
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// Actual handler that runs in WebCore thread
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private Handler mHandler;
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// Vector of messages before the WebCore thread is ready
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private Vector<Message> mMessages = new Vector<Message>();
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// Class to handle a result dispatch
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private class IconResult {
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private final String mUrl;
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private final Bitmap mIcon;
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private final IconListener mListener;
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IconResult(String url, Bitmap icon, IconListener l) {
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mUrl = url;
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mIcon = icon;
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mListener = l;
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}
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void dispatch() {
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mListener.onReceivedIcon(mUrl, mIcon);
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}
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}
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@Override
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public void handleMessage(Message msg) {
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// Note: This is the message handler for the UI thread.
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switch (msg.what) {
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case ICON_RESULT:
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((IconResult) msg.obj).dispatch();
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break;
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}
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}
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// Called by WebCore thread to create the actual handler
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private synchronized void createHandler() {
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if (mHandler == null) {
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mHandler = new Handler() {
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@Override
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public void handleMessage(Message msg) {
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// Note: This is the message handler for the WebCore
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// thread.
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switch (msg.what) {
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case OPEN:
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nativeOpen((String) msg.obj);
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break;
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case CLOSE:
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nativeClose();
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break;
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case REMOVE_ALL:
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nativeRemoveAllIcons();
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break;
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case REQUEST_ICON:
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IconListener l = (IconListener) msg.obj;
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String url = msg.getData().getString("url");
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requestIconAndSendResult(url, l);
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break;
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case BULK_REQUEST_ICON:
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bulkRequestIcons(msg);
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break;
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case RETAIN_ICON:
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nativeRetainIconForPageUrl((String) msg.obj);
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break;
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case RELEASE_ICON:
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nativeReleaseIconForPageUrl((String) msg.obj);
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break;
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}
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}
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};
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// Transfer all pending messages
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for (int size = mMessages.size(); size > 0; size--) {
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mHandler.sendMessage(mMessages.remove(0));
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}
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mMessages = null;
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}
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}
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private synchronized boolean hasHandler() {
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return mHandler != null;
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}
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private synchronized void postMessage(Message msg) {
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if (mMessages != null) {
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mMessages.add(msg);
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} else {
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mHandler.sendMessage(msg);
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}
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}
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private void bulkRequestIcons(Message msg) {
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HashMap map = (HashMap) msg.obj;
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IconListener listener = (IconListener) map.get("listener");
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ContentResolver cr = (ContentResolver) map.get("contentResolver");
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String where = (String) map.get("where");
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Cursor c = null;
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try {
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c = cr.query(
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Browser.BOOKMARKS_URI,
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new String[] { Browser.BookmarkColumns.URL },
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where, null, null);
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if (c.moveToFirst()) {
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do {
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String url = c.getString(0);
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requestIconAndSendResult(url, listener);
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} while (c.moveToNext());
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}
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} catch (IllegalStateException e) {
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Log.e(LOGTAG, "BulkRequestIcons", e);
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} finally {
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if (c != null) c.close();
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}
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}
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private void requestIconAndSendResult(String url, IconListener listener) {
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Bitmap icon = nativeIconForPageUrl(url);
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if (icon != null) {
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sendMessage(obtainMessage(ICON_RESULT,
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new IconResult(url, icon, listener)));
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}
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}
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}
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/**
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* Interface for receiving icons from the database.
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*/
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public interface IconListener {
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/**
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* Called when the icon has been retrieved from the database and the
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* result is non-null.
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* @param url The url passed in the request.
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* @param icon The favicon for the given url.
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*/
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public void onReceivedIcon(String url, Bitmap icon);
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}
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/**
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* Open a the icon database and store the icons in the given path.
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* @param path The directory path where the icon database will be stored.
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*/
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public void open(String path) {
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if (path != null) {
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// Make the directories and parents if they don't exist
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File db = new File(path);
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if (!db.exists()) {
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db.mkdirs();
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}
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mEventHandler.postMessage(
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Message.obtain(null, EventHandler.OPEN, db.getAbsolutePath()));
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}
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}
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/**
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* Close the shared instance of the icon database.
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*/
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public void close() {
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mEventHandler.postMessage(
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Message.obtain(null, EventHandler.CLOSE));
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}
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/**
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* Removes all the icons in the database.
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*/
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public void removeAllIcons() {
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mEventHandler.postMessage(
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Message.obtain(null, EventHandler.REMOVE_ALL));
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}
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/**
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* Request the Bitmap representing the icon for the given page
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* url. If the icon exists, the listener will be called with the result.
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* @param url The page's url.
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* @param listener An implementation on IconListener to receive the result.
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*/
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public void requestIconForPageUrl(String url, IconListener listener) {
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if (listener == null || url == null) {
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return;
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}
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Message msg = Message.obtain(null, EventHandler.REQUEST_ICON, listener);
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msg.getData().putString("url", url);
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mEventHandler.postMessage(msg);
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}
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/** {@hide}
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*/
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public void bulkRequestIconForPageUrl(ContentResolver cr, String where,
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IconListener listener) {
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if (listener == null) {
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return;
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}
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// Special case situation: we don't want to add this message to the
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// queue if there is no handler because we may never have a real
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// handler to service the messages and the cursor will never get
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// closed.
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if (mEventHandler.hasHandler()) {
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// Don't use Bundle as it is parcelable.
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HashMap<String, Object> map = new HashMap<String, Object>();
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map.put("contentResolver", cr);
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map.put("where", where);
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map.put("listener", listener);
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Message msg =
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Message.obtain(null, EventHandler.BULK_REQUEST_ICON, map);
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mEventHandler.postMessage(msg);
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}
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}
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/**
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* Retain the icon for the given page url.
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* @param url The page's url.
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*/
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public void retainIconForPageUrl(String url) {
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if (url != null) {
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mEventHandler.postMessage(
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Message.obtain(null, EventHandler.RETAIN_ICON, url));
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}
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}
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/**
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* Release the icon for the given page url.
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* @param url The page's url.
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*/
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public void releaseIconForPageUrl(String url) {
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if (url != null) {
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mEventHandler.postMessage(
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Message.obtain(null, EventHandler.RELEASE_ICON, url));
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}
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}
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/**
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* Get the global instance of WebIconDatabase.
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* @return A single instance of WebIconDatabase. It will be the same
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* instance for the current process each time this method is
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* called.
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*/
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public static WebIconDatabase getInstance() {
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// XXX: Must be created in the UI thread.
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if (sIconDatabase == null) {
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sIconDatabase = new WebIconDatabase();
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}
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return sIconDatabase;
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}
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/**
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* Create the internal handler and transfer all pending messages.
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* XXX: Called by WebCore thread only!
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*/
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/*package*/ void createHandler() {
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mEventHandler.createHandler();
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}
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/**
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* Private constructor to avoid anyone else creating an instance.
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*/
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private WebIconDatabase() {}
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// Native functions
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private static native void nativeOpen(String path);
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private static native void nativeClose();
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private static native void nativeRemoveAllIcons();
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private static native Bitmap nativeIconForPageUrl(String url);
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private static native void nativeRetainIconForPageUrl(String url);
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private static native void nativeReleaseIconForPageUrl(String url);
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}
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