1 /*
2  * Copyright (C) 2010 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.util;
18 
19 /**
20  * PrefixPrinter is a Printer which prefixes all lines with a given
21  * prefix.
22  *
23  * @hide
24  */
25 public class PrefixPrinter implements Printer {
26     private final Printer mPrinter;
27     private final String mPrefix;
28 
29     /**
30      * Creates a new PrefixPrinter.
31      *
32      * <p>If prefix is null or empty, the provided printer is returned, rather
33      * than making a prefixing printer.
34      */
create(Printer printer, String prefix)35     public static Printer create(Printer printer, String prefix) {
36         if (prefix == null || prefix.equals("")) {
37             return printer;
38         }
39         return new PrefixPrinter(printer, prefix);
40     }
41 
PrefixPrinter(Printer printer, String prefix)42     private PrefixPrinter(Printer printer, String prefix) {
43         mPrinter = printer;
44         mPrefix = prefix;
45     }
46 
println(String str)47     public void println(String str) {
48         mPrinter.println(mPrefix + str);
49     }
50 }
51