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/*
* Copyright (C) 2006 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.util;
import android.annotation.UnsupportedAppUsage;
import java.io.FileDescriptor;
import java.io.PrintWriter;
import java.time.LocalDateTime;
import java.util.ArrayDeque;
import java.util.Deque;
import java.util.Iterator;
/**
* @hide
*/
public final class LocalLog {
private final Deque<String> mLog;
private final int mMaxLines;
@UnsupportedAppUsage
public LocalLog(int maxLines) {
mMaxLines = Math.max(0, maxLines);
mLog = new ArrayDeque<>(mMaxLines);
}
@UnsupportedAppUsage
public void log(String msg) {
if (mMaxLines <= 0) {
return;
}
append(String.format("%s - %s", LocalDateTime.now(), msg));
}
private synchronized void append(String logLine) {
while (mLog.size() >= mMaxLines) {
mLog.remove();
}
mLog.add(logLine);
}
@UnsupportedAppUsage
public synchronized void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
dump(pw);
}
public synchronized void dump(PrintWriter pw) {
Iterator<String> itr = mLog.iterator();
while (itr.hasNext()) {
pw.println(itr.next());
}
}
public synchronized void reverseDump(FileDescriptor fd, PrintWriter pw, String[] args) {
reverseDump(pw);
}
public synchronized void reverseDump(PrintWriter pw) {
Iterator<String> itr = mLog.descendingIterator();
while (itr.hasNext()) {
pw.println(itr.next());
}
}
public static class ReadOnlyLocalLog {
private final LocalLog mLog;
ReadOnlyLocalLog(LocalLog log) {
mLog = log;
}
@UnsupportedAppUsage
public void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
mLog.dump(pw);
}
public void dump(PrintWriter pw) {
mLog.dump(pw);
}
public void reverseDump(FileDescriptor fd, PrintWriter pw, String[] args) {
mLog.reverseDump(pw);
}
public void reverseDump(PrintWriter pw) {
mLog.reverseDump(pw);
}
}
@UnsupportedAppUsage
public ReadOnlyLocalLog readOnlyLocalLog() {
return new ReadOnlyLocalLog(this);
}
}
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