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
17package android.util;
18
19/**
20 * PrefixPrinter is a Printer which prefixes all lines with a given
21 * prefix.
22 *
23 * @hide
24 */
25public 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     */
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
42    private PrefixPrinter(Printer printer, String prefix) {
43        mPrinter = printer;
44        mPrefix = prefix;
45    }
46
47    public void println(String str) {
48        mPrinter.println(mPrefix + str);
49    }
50}
51