Writers.java revision 72e93344b4d1ffc71e9c832ec23de0657e5b04a5 
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
17package com.android.dx.util;
18
19import java.io.PrintWriter;
20import java.io.Writer;
21
22/**
23 * Utilities for dealing with {@code Writer}s.
24 */
25public final class Writers {
26    /**
27     * This class is uninstantiable.
28     */
29    private Writers() {
30        // This space intentionally left blank.
31    }
32
33    /**
34     * Makes a {@code PrintWriter} for the given {@code Writer},
35     * returning the given writer if it already happens to be the right
36     * class.
37     *
38     * @param writer {@code non-null;} writer to (possibly) wrap
39     * @return {@code non-null;} an appropriate instance
40     */
41    public static PrintWriter printWriterFor(Writer writer) {
42        if (writer instanceof PrintWriter) {
43            return (PrintWriter) writer;
44        }
45
46        return new PrintWriter(writer);
47    }
48}
49