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      1 /*
      2  * Copyright (C) 2007 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 android.content;
     18 
     19 import android.net.Uri;
     20 
     21 /**
     22  * Utility methods useful for working with content {@link android.net.Uri}s,
     23  * those with a "content" scheme.
     24  */
     25 public class ContentUris {
     26 
     27     /**
     28      * Converts the last path segment to a long.
     29      *
     30      * <p>This supports a common convention for content URIs where an ID is
     31      * stored in the last segment.
     32      *
     33      * @throws UnsupportedOperationException if this isn't a hierarchical URI
     34      * @throws NumberFormatException if the last segment isn't a number
     35      *
     36      * @return the long conversion of the last segment or -1 if the path is
     37      *  empty
     38      */
     39     public static long parseId(Uri contentUri) {
     40         String last = contentUri.getLastPathSegment();
     41         return last == null ? -1 : Long.parseLong(last);
     42     }
     43 
     44     /**
     45      * Appends the given ID to the end of the path.
     46      *
     47      * @param builder to append the ID to
     48      * @param id to append
     49      *
     50      * @return the given builder
     51      */
     52     public static Uri.Builder appendId(Uri.Builder builder, long id) {
     53         return builder.appendEncodedPath(String.valueOf(id));
     54     }
     55 
     56     /**
     57      * Appends the given ID to the end of the path.
     58      *
     59      * @param contentUri to start with
     60      * @param id to append
     61      *
     62      * @return a new URI with the given ID appended to the end of the path
     63      */
     64     public static Uri withAppendedId(Uri contentUri, long id) {
     65         return appendId(contentUri.buildUpon(), id).build();
     66     }
     67 }
     68