1 /*
2  * Copyright (C) 2011 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 
17 package com.android.contacts.common.util;
18 
19 import android.net.Uri;
20 import android.provider.ContactsContract;
21 
22 import java.util.List;
23 
24 /**
25  * Utility methods for dealing with URIs.
26  */
27 public class UriUtils {
28     /** Static helper, not instantiable. */
UriUtils()29     private UriUtils() {}
30 
31     /** Checks whether two URI are equal, taking care of the case where either is null. */
areEqual(Uri uri1, Uri uri2)32     public static boolean areEqual(Uri uri1, Uri uri2) {
33         if (uri1 == null && uri2 == null) {
34             return true;
35         }
36         if (uri1 == null || uri2 == null) {
37             return false;
38         }
39         return uri1.equals(uri2);
40     }
41 
42     /** Parses a string into a URI and returns null if the given string is null. */
parseUriOrNull(String uriString)43     public static Uri parseUriOrNull(String uriString) {
44         if (uriString == null) {
45             return null;
46         }
47         return Uri.parse(uriString);
48     }
49 
50     /** Converts a URI into a string, returns null if the given URI is null. */
uriToString(Uri uri)51     public static String uriToString(Uri uri) {
52         return uri == null ? null : uri.toString();
53     }
54 
isEncodedContactUri(Uri uri)55     public static boolean isEncodedContactUri(Uri uri) {
56         if (uri == null) {
57             return false;
58         }
59         final String lastPathSegment = uri.getLastPathSegment();
60         if (lastPathSegment == null) {
61             return false;
62         }
63         return lastPathSegment.equals(Constants.LOOKUP_URI_ENCODED);
64     }
65 
66     /**
67      * @return {@code uri} as-is if the authority is of contacts provider.  Otherwise
68      * or {@code uri} is null, return null otherwise
69      */
nullForNonContactsUri(Uri uri)70     public static Uri nullForNonContactsUri(Uri uri) {
71         if (uri == null) {
72             return null;
73         }
74         return ContactsContract.AUTHORITY.equals(uri.getAuthority()) ? uri : null;
75     }
76 
77     /**
78      * Parses the given URI to determine the original lookup key of the contact.
79      */
getLookupKeyFromUri(Uri lookupUri)80     public static String getLookupKeyFromUri(Uri lookupUri) {
81         // Would be nice to be able to persist the lookup key somehow to avoid having to parse
82         // the uri entirely just to retrieve the lookup key, but every uri is already parsed
83         // once anyway to check if it is an encoded JSON uri, so this has negligible effect
84         // on performance.
85         if (lookupUri != null && !UriUtils.isEncodedContactUri(lookupUri)) {
86             final List<String> segments = lookupUri.getPathSegments();
87             // This returns the third path segment of the uri, where the lookup key is located.
88             // See {@link android.provider.ContactsContract.Contacts#CONTENT_LOOKUP_URI}.
89             return (segments.size() < 3) ? null : Uri.encode(segments.get(2));
90         } else {
91             return null;
92         }
93     }
94 }
95