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/*
* Copyright (C) 2011 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 com.android.inputmethod.latin.utils;
import android.util.Log;
import com.android.inputmethod.latin.define.DebugFlags;
/**
* A class for logging and debugging utility methods.
*/
public final class DebugLogUtils {
private final static String TAG = DebugLogUtils.class.getSimpleName();
private final static boolean sDBG = DebugFlags.DEBUG_ENABLED;
/**
* Calls .toString() on its non-null argument or returns "null"
* @param o the object to convert to a string
* @return the result of .toString() or null
*/
public static String s(final Object o) {
return null == o ? "null" : o.toString();
}
/**
* Get the string representation of the current stack trace, for debugging purposes.
* @return a readable, carriage-return-separated string for the current stack trace.
*/
public static String getStackTrace() {
return getStackTrace(Integer.MAX_VALUE - 1);
}
/**
* Get the string representation of the current stack trace, for debugging purposes.
* @param limit the maximum number of stack frames to be returned.
* @return a readable, carriage-return-separated string for the current stack trace.
*/
public static String getStackTrace(final int limit) {
final StringBuilder sb = new StringBuilder();
try {
throw new RuntimeException();
} catch (final RuntimeException e) {
final StackTraceElement[] frames = e.getStackTrace();
// Start at 1 because the first frame is here and we don't care about it
for (int j = 1; j < frames.length && j < limit + 1; ++j) {
sb.append(frames[j].toString() + "\n");
}
}
return sb.toString();
}
/**
* Get the stack trace contained in an exception as a human-readable string.
* @param t the throwable
* @return the human-readable stack trace
*/
public static String getStackTrace(final Throwable t) {
final StringBuilder sb = new StringBuilder();
final StackTraceElement[] frames = t.getStackTrace();
for (int j = 0; j < frames.length; ++j) {
sb.append(frames[j].toString() + "\n");
}
return sb.toString();
}
/**
* Helper log method to ease null-checks and adding spaces.
*
* This sends all arguments to the log, separated by spaces. Any null argument is converted
* to the "null" string. It uses a very visible tag and log level for debugging purposes.
*
* @param args the stuff to send to the log
*/
public static void l(final Object... args) {
if (!sDBG) return;
final StringBuilder sb = new StringBuilder();
for (final Object o : args) {
sb.append(s(o).toString());
sb.append(" ");
}
Log.e(TAG, sb.toString());
}
/**
* Helper log method to put stuff in red.
*
* This does the same as #l but prints in red
*
* @param args the stuff to send to the log
*/
public static void r(final Object... args) {
if (!sDBG) return;
final StringBuilder sb = new StringBuilder("\u001B[31m");
for (final Object o : args) {
sb.append(s(o).toString());
sb.append(" ");
}
sb.append("\u001B[0m");
Log.e(TAG, sb.toString());
}
}
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