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-rw-r--r--src/com/android/browser/InstantSearchEngine.java430
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diff --git a/src/com/android/browser/InstantSearchEngine.java b/src/com/android/browser/InstantSearchEngine.java
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index 7176c0a..0000000
--- a/src/com/android/browser/InstantSearchEngine.java
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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 com.android.browser.Controller;
-import com.android.browser.R;
-import com.android.browser.UI.DropdownChangeListener;
-import com.android.browser.provider.BrowserProvider;
-import com.android.browser.search.SearchEngine;
-
-import android.app.SearchManager;
-import android.content.Context;
-import android.database.AbstractCursor;
-import android.database.Cursor;
-import android.net.Uri;
-import android.os.Bundle;
-import android.text.TextUtils;
-import android.util.Log;
-import android.util.LruCache;
-import android.webkit.SearchBox;
-import android.webkit.WebView;
-
-import java.util.Collections;
-import java.util.List;
-
-public class InstantSearchEngine implements SearchEngine, DropdownChangeListener {
- private static final String TAG = "Browser.InstantSearchEngine";
- private static final boolean DBG = false;
-
- private Controller mController;
- private SearchBox mSearchBox;
- private final BrowserSearchboxListener mListener = new BrowserSearchboxListener();
- private int mHeight;
-
- private String mInstantBaseUrl;
- private final Context mContext;
- // Used for startSearch( ) calls if for some reason instant
- // is off, or no searchbox is present.
- private final SearchEngine mWrapped;
-
- public InstantSearchEngine(Context context, SearchEngine wrapped) {
- mContext = context.getApplicationContext();
- mWrapped = wrapped;
- }
-
- public void setController(Controller controller) {
- mController = controller;
- }
-
- @Override
- public String getName() {
- return SearchEngine.GOOGLE;
- }
-
- @Override
- public CharSequence getLabel() {
- return mContext.getResources().getString(R.string.instant_search_label);
- }
-
- @Override
- public void startSearch(Context context, String query, Bundle appData, String extraData) {
- if (DBG) Log.d(TAG, "startSearch(" + query + ")");
-
- switchSearchboxIfNeeded();
-
- // If for some reason we are in a bad state, ensure that the
- // user gets default search results at the very least.
- if (mSearchBox == null || !isInstantPage()) {
- mWrapped.startSearch(context, query, appData, extraData);
- return;
- }
-
- mSearchBox.setQuery(query);
- mSearchBox.setVerbatim(true);
- mSearchBox.onsubmit(null);
- }
-
- private final class BrowserSearchboxListener extends SearchBox.SearchBoxListener {
- /*
- * The maximum number of out of order suggestions we accept
- * before giving up the wait.
- */
- private static final int MAX_OUT_OF_ORDER = 5;
-
- /*
- * We wait for suggestions in increments of 600ms. This is primarily to
- * guard against suggestions arriving out of order.
- */
- private static final int WAIT_INCREMENT_MS = 600;
-
- /*
- * A cache of suggestions received, keyed by the queries they were
- * received for.
- */
- private final LruCache<String, List<String>> mSuggestions =
- new LruCache<String, List<String>>(20);
-
- /*
- * The last set of suggestions received. We use this reduce UI flicker
- * in case there is a delay in recieving suggestions.
- */
- private List<String> mLatestSuggestion = Collections.emptyList();
-
- @Override
- public synchronized void onSuggestionsReceived(String query, List<String> suggestions) {
- if (DBG) Log.d(TAG, "onSuggestionsReceived(" + query + ")");
-
- if (!TextUtils.isEmpty(query)) {
- mSuggestions.put(query, suggestions);
- mLatestSuggestion = suggestions;
- }
-
- notifyAll();
- }
-
- public synchronized List<String> tryWaitForSuggestions(String query) {
- if (DBG) Log.d(TAG, "tryWait(" + query + ")");
-
- int numWaitReturns = 0;
-
- // This slightly unusual waiting construct is used to safeguard
- // to some extent against suggestions arriving out of order. We
- // wait for upto 5 notifyAll( ) calls to check if we received
- // suggestions for a given query.
- while (mSuggestions.get(query) == null) {
- try {
- wait(WAIT_INCREMENT_MS);
- ++numWaitReturns;
- if (numWaitReturns > MAX_OUT_OF_ORDER) {
- // We've waited too long for suggestions to be returned.
- // return the last available suggestion.
- break;
- }
- } catch (InterruptedException e) {
- return Collections.emptyList();
- }
- }
-
- List<String> suggestions = mSuggestions.get(query);
- if (suggestions == null) {
- return mLatestSuggestion;
- }
-
- return suggestions;
- }
-
- public synchronized void clear() {
- mSuggestions.evictAll();
- }
- }
-
- private WebView getCurrentWebview() {
- if (mController != null) {
- return mController.getTabControl().getCurrentTopWebView();
- }
-
- return null;
- }
-
- /**
- * Attaches the searchbox to the right browser page, i.e, the currently
- * visible tab.
- */
- private void switchSearchboxIfNeeded() {
- final WebView current = getCurrentWebview();
- if (current == null) {
- return;
- }
-
- final SearchBox searchBox = current.getSearchBox();
- if (searchBox != mSearchBox) {
- if (mSearchBox != null) {
- mSearchBox.removeSearchBoxListener(mListener);
- mListener.clear();
- }
- mSearchBox = searchBox;
- if (mSearchBox != null) {
- mSearchBox.addSearchBoxListener(mListener);
- }
- }
- }
-
- private boolean isInstantPage() {
- final WebView current = getCurrentWebview();
- if (current == null) {
- return false;
- }
-
- final String currentUrl = mController.getCurrentTab().getUrl();
-
- if (currentUrl != null) {
- Uri uri = Uri.parse(currentUrl);
- final String host = uri.getHost();
- final String path = uri.getPath();
-
- // Is there a utility class that does this ?
- if (path != null && host != null) {
- return host.startsWith("www.google.") &&
- (path.startsWith("/search") || path.startsWith("/webhp"));
- }
- return false;
- }
-
- return false;
- }
-
- private void loadInstantPage() {
- mController.getActivity().runOnUiThread(new Runnable() {
- @Override
- public void run() {
- final WebView current = getCurrentWebview();
- if (current != null) {
- current.loadUrl(getInstantBaseUrl());
- }
- }
- });
- }
-
- /**
- * Queries for a given search term and returns a cursor containing
- * suggestions ordered by best match.
- */
- @Override
- public Cursor getSuggestions(Context context, String query) {
- if (DBG) Log.d(TAG, "getSuggestions(" + query + ")");
- if (query == null) {
- return null;
- }
-
- if (!isInstantPage()) {
- loadInstantPage();
- }
-
- switchSearchboxIfNeeded();
-
- mController.registerDropdownChangeListener(this);
-
- if (mSearchBox == null) {
- return mWrapped.getSuggestions(context, query);
- }
-
- mSearchBox.setDimensions(0, 0, 0, mHeight);
- mSearchBox.onresize(null);
-
- if (TextUtils.isEmpty(query)) {
- // To force the SRP to render an empty (no results) page.
- mSearchBox.setVerbatim(true);
- } else {
- mSearchBox.setVerbatim(false);
- }
- mSearchBox.setQuery(query);
- mSearchBox.onchange(null);
-
- // Don't bother waiting for suggestions for an empty query. We still
- // set the query so that the SRP clears itself.
- if (TextUtils.isEmpty(query)) {
- return new SuggestionsCursor(Collections.<String>emptyList());
- } else {
- return new SuggestionsCursor(mListener.tryWaitForSuggestions(query));
- }
- }
-
- @Override
- public boolean supportsSuggestions() {
- return true;
- }
-
- @Override
- public void close() {
- if (mController != null) {
- mController.registerDropdownChangeListener(null);
- }
- if (mSearchBox != null) {
- mSearchBox.removeSearchBoxListener(mListener);
- }
- mListener.clear();
- mWrapped.close();
- }
-
- @Override
- public boolean supportsVoiceSearch() {
- return false;
- }
-
- @Override
- public String toString() {
- return "InstantSearchEngine {" + hashCode() + "}";
- }
-
- @Override
- public boolean wantsEmptyQuery() {
- return true;
- }
-
- private int rescaleHeight(int height) {
- final WebView current = getCurrentWebview();
- if (current == null) {
- return 0;
- }
-
- final float scale = current.getScale();
- if (scale != 0) {
- return (int) (height / scale);
- }
-
- return height;
- }
-
- @Override
- public void onNewDropdownDimensions(int height) {
- final int rescaledHeight = rescaleHeight(height);
-
- if (rescaledHeight != mHeight) {
- mHeight = rescaledHeight;
- if (mSearchBox != null) {
- mSearchBox.setDimensions(0, 0, 0, rescaledHeight);
- mSearchBox.onresize(null);
- }
- }
- }
-
- private String getInstantBaseUrl() {
- if (mInstantBaseUrl == null) {
- String url = mContext.getResources().getString(R.string.instant_base);
- if (url.indexOf("{CID}") != -1) {
- url = url.replace("{CID}",
- BrowserProvider.getClientId(mContext.getContentResolver()));
- }
- mInstantBaseUrl = url;
- }
-
- return mInstantBaseUrl;
- }
-
- // Indices of the columns in the below arrays.
- private static final int COLUMN_INDEX_ID = 0;
- private static final int COLUMN_INDEX_QUERY = 1;
- private static final int COLUMN_INDEX_ICON = 2;
- private static final int COLUMN_INDEX_TEXT_1 = 3;
-
- private static final String[] COLUMNS_WITHOUT_DESCRIPTION = new String[] {
- "_id",
- SearchManager.SUGGEST_COLUMN_QUERY,
- SearchManager.SUGGEST_COLUMN_ICON_1,
- SearchManager.SUGGEST_COLUMN_TEXT_1,
- };
-
- private static class SuggestionsCursor extends AbstractCursor {
- private final List<String> mSuggestions;
-
- public SuggestionsCursor(List<String> suggestions) {
- mSuggestions = suggestions;
- }
-
- @Override
- public int getCount() {
- return mSuggestions.size();
- }
-
- @Override
- public String[] getColumnNames() {
- return COLUMNS_WITHOUT_DESCRIPTION;
- }
-
- private String format(String suggestion) {
- if (TextUtils.isEmpty(suggestion)) {
- return "";
- }
- return suggestion;
- }
-
- @Override
- public String getString(int column) {
- if (mPos >= 0 && mPos < mSuggestions.size()) {
- if ((column == COLUMN_INDEX_QUERY) || (column == COLUMN_INDEX_TEXT_1)) {
- return format(mSuggestions.get(mPos));
- } else if (column == COLUMN_INDEX_ICON) {
- return String.valueOf(R.drawable.magnifying_glass);
- }
- }
- return null;
- }
-
- @Override
- public double getDouble(int column) {
- throw new UnsupportedOperationException();
- }
-
- @Override
- public float getFloat(int column) {
- throw new UnsupportedOperationException();
- }
-
- @Override
- public int getInt(int column) {
- if (column == COLUMN_INDEX_ID) {
- return mPos;
- }
- throw new UnsupportedOperationException();
- }
-
- @Override
- public long getLong(int column) {
- throw new UnsupportedOperationException();
- }
-
- @Override
- public short getShort(int column) {
- throw new UnsupportedOperationException();
- }
-
- @Override
- public boolean isNull(int column) {
- throw new UnsupportedOperationException();
- }
- }
-}
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