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
17package android.util;
18
19import java.io.Writer;
20
21/** @hide */
22public class LogWriter extends Writer {
23    private final int mPriority;
24    private final String mTag;
25    private final int mBuffer;
26    private StringBuilder mBuilder = new StringBuilder(128);
27
28    /**
29     * Create a new Writer that sends to the log with the given priority
30     * and tag.
31     *
32     * @param priority The desired log priority:
33     * {@link android.util.Log#VERBOSE Log.VERBOSE},
34     * {@link android.util.Log#DEBUG Log.DEBUG},
35     * {@link android.util.Log#INFO Log.INFO},
36     * {@link android.util.Log#WARN Log.WARN}, or
37     * {@link android.util.Log#ERROR Log.ERROR}.
38     * @param tag A string tag to associate with each printed log statement.
39     */
40    public LogWriter(int priority, String tag) {
41        mPriority = priority;
42        mTag = tag;
43        mBuffer = Log.LOG_ID_MAIN;
44    }
45
46    /**
47     * @hide
48     * Same as above, but buffer is one of the LOG_ID_ constants from android.util.Log.
49     */
50    public LogWriter(int priority, String tag, int buffer) {
51        mPriority = priority;
52        mTag = tag;
53        mBuffer = buffer;
54    }
55
56    @Override public void close() {
57        flushBuilder();
58    }
59
60    @Override public void flush() {
61        flushBuilder();
62    }
63
64    @Override public void write(char[] buf, int offset, int count) {
65        for(int i = 0; i < count; i++) {
66            char c = buf[offset + i];
67            if ( c == '\n') {
68                flushBuilder();
69            }
70            else {
71                mBuilder.append(c);
72            }
73        }
74    }
75
76    private void flushBuilder() {
77        if (mBuilder.length() > 0) {
78            Log.println_native(mBuffer, mPriority, mTag, mBuilder.toString());
79            mBuilder.delete(0, mBuilder.length());
80        }
81    }
82}
83