GoogleSuggestionProvider.java revision 69494b842a3f907164a457852c385f86dbe71d15 
1/*
2 * Copyright (C) 2008 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package com.android.quicksearchbox.google;
18
19import com.android.quicksearchbox.QsbApplication;
20import com.android.quicksearchbox.SuggestionCursorBackedCursor;
21
22import android.app.SearchManager;
23import android.content.ContentProvider;
24import android.content.ContentValues;
25import android.content.Context;
26import android.content.UriMatcher;
27import android.database.Cursor;
28import android.net.Uri;
29
30/**
31 * A suggestion provider which provides content from Genie, a service that offers
32 * a superset of the content provided by Google Suggest.
33 */
34public class GoogleSuggestionProvider extends ContentProvider {
35
36    // UriMatcher constants
37    private static final int SEARCH_SUGGEST = 0;
38    private static final int SEARCH_SHORTCUT = 1;
39
40    private UriMatcher mUriMatcher;
41
42    private GoogleSource mSource;
43
44    @Override
45    public boolean onCreate() {
46        mSource = QsbApplication.get(getContext()).getGoogleSource();
47        mUriMatcher = buildUriMatcher(getContext());
48        return true;
49    }
50
51    /**
52     * This will always return {@link SearchManager#SUGGEST_MIME_TYPE} as this
53     * provider is purely to provide suggestions.
54     */
55    @Override
56    public String getType(Uri uri) {
57        return SearchManager.SUGGEST_MIME_TYPE;
58    }
59
60    @Override
61    public Cursor query(Uri uri, String[] projection, String selection,
62            String[] selectionArgs, String sortOrder) {
63
64        int match = mUriMatcher.match(uri);
65
66        if (match == SEARCH_SUGGEST) {
67            String query = getQuery(uri);
68            return new SuggestionCursorBackedCursor(mSource.getSuggestionsExternal(query));
69        } else if (match == SEARCH_SHORTCUT) {
70            String shortcutId = getQuery(uri);
71            String extraData =
72                uri.getQueryParameter(SearchManager.SUGGEST_COLUMN_INTENT_EXTRA_DATA);
73            return new SuggestionCursorBackedCursor(mSource.refreshShortcut(shortcutId, extraData));
74        } else {
75            throw new IllegalArgumentException("Unknown URI " + uri);
76        }
77    }
78
79    /**
80     * Gets the search text from a uri.
81     */
82    private String getQuery(Uri uri) {
83        if (uri.getPathSegments().size() > 1) {
84            return uri.getLastPathSegment();
85        } else {
86            return "";
87        }
88    }
89
90    @Override
91    public Uri insert(Uri uri, ContentValues values) {
92        throw new UnsupportedOperationException();
93    }
94
95    @Override
96    public int update(Uri uri, ContentValues values, String selection,
97            String[] selectionArgs) {
98        throw new UnsupportedOperationException();
99    }
100
101    @Override
102    public int delete(Uri uri, String selection, String[] selectionArgs) {
103        throw new UnsupportedOperationException();
104    }
105
106    private UriMatcher buildUriMatcher(Context context) {
107        String authority = getAuthority(context);
108        UriMatcher matcher = new UriMatcher(UriMatcher.NO_MATCH);
109        matcher.addURI(authority, SearchManager.SUGGEST_URI_PATH_QUERY,
110                SEARCH_SUGGEST);
111        matcher.addURI(authority, SearchManager.SUGGEST_URI_PATH_QUERY + "/*",
112                SEARCH_SUGGEST);
113        matcher.addURI(authority, SearchManager.SUGGEST_URI_PATH_SHORTCUT,
114                SEARCH_SHORTCUT);
115        matcher.addURI(authority, SearchManager.SUGGEST_URI_PATH_SHORTCUT + "/*",
116                SEARCH_SHORTCUT);
117        return matcher;
118    }
119
120    protected String getAuthority(Context context) {
121        return context.getPackageName() + ".google";
122    }
123
124}
125