| /* |
| * Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package jdk.nashorn.internal.runtime; |
| |
| import java.io.PrintWriter; |
| import java.util.logging.Level; |
| import java.util.logging.Logger; |
| import jdk.nashorn.internal.runtime.options.Options; |
| |
| /** |
| * Wrapper class for Logging system. This is how you are supposed to register a logger and use it |
| */ |
| |
| public final class DebugLogger { |
| @SuppressWarnings("NonConstantLogger") |
| private final Logger logger; |
| private final boolean isEnabled; |
| |
| private int indent; |
| |
| private static final int INDENT_SPACE = 4; |
| |
| /** |
| * Constructor |
| * |
| * @param loggerName name of logger - this is the unique key with which it can be identified |
| */ |
| public DebugLogger(final String loggerName) { |
| this(loggerName, null); |
| } |
| |
| /** |
| * Constructor |
| * |
| * A logger can be paired with a property, e.g. {@code --log:codegen:info} is equivalent to {@code -Dnashorn.codegen.log} |
| * |
| * @param loggerName name of logger - this is the unique key with which it can be identified |
| * @param property system property activating the logger on {@code info} level |
| */ |
| public DebugLogger(final String loggerName, final String property) { |
| if (property != null && Options.getBooleanProperty(property)) { |
| this.logger = Logging.getOrCreateLogger(loggerName, Level.INFO); |
| } else { |
| this.logger = Logging.getLogger(loggerName); |
| } |
| this.isEnabled = logger.getLevel() != Level.OFF; |
| } |
| |
| /** |
| * Get the output writer for the logger. Loggers always default to |
| * stderr for output as they are used mainly to output debug info |
| * |
| * Can be inherited so this should not be static. |
| * |
| * @return print writer for log output. |
| */ |
| @SuppressWarnings("static-method") |
| public PrintWriter getOutputStream() { |
| return Context.getCurrentErr(); |
| } |
| |
| /** |
| * Check if the logger is enabled |
| * @return true if enabled |
| */ |
| public boolean isEnabled() { |
| return isEnabled; |
| } |
| |
| /** |
| * If you want to change the indent level of your logger, call indent with a new position. |
| * Positions start at 0 and are increased by one for a new "tab" |
| * |
| * @param pos indent position |
| */ |
| public void indent(final int pos) { |
| if (isEnabled) { |
| indent += pos * INDENT_SPACE; |
| } |
| } |
| |
| /** |
| * Add an indent position |
| */ |
| public void indent() { |
| indent += INDENT_SPACE; |
| } |
| |
| /** |
| * Unindent a position |
| */ |
| public void unindent() { |
| indent -= INDENT_SPACE; |
| if (indent < 0) { |
| indent = 0; |
| } |
| } |
| |
| /** |
| * Check if the logger is above of the level of detail given |
| * @see java.util.logging.Level |
| * |
| * @param level logging level |
| * @return true if level is above the given one |
| */ |
| public boolean levelAbove(final Level level) { |
| return logger.getLevel().intValue() > level.intValue(); |
| } |
| |
| /** |
| * Shorthand for outputting a log string as log level {@link java.util.logging.Level#FINEST} on this logger |
| * @param str the string to log |
| */ |
| public void finest(final String str) { |
| log(Level.FINEST, str); |
| } |
| |
| /** |
| * Shorthand for outputting a log string as log level |
| * {@link java.util.logging.Level#FINEST} on this logger |
| * @param objs object array to log - use this to perform lazy concatenation to avoid unconditional toString overhead |
| */ |
| public void finest(final Object... objs) { |
| log(Level.FINEST, objs); |
| } |
| |
| /** |
| * Shorthand for outputting a log string as log level |
| * {@link java.util.logging.Level#FINER} on this logger |
| * @param str the string to log |
| */ |
| public void finer(final String str) { |
| log(Level.FINER, str); |
| } |
| |
| /** |
| * Shorthand for outputting a log string as log level |
| * {@link java.util.logging.Level#FINER} on this logger |
| * @param objs object array to log - use this to perform lazy concatenation to avoid unconditional toString overhead |
| */ |
| public void finer(final Object... objs) { |
| log(Level.FINER, objs); |
| } |
| |
| /** |
| * Shorthand for outputting a log string as log level |
| * {@link java.util.logging.Level#FINE} on this logger |
| * @param str the string to log |
| */ |
| public void fine(final String str) { |
| log(Level.FINE, str); |
| } |
| |
| /** |
| * Shorthand for outputting a log string as log level |
| * {@link java.util.logging.Level#FINE} on this logger |
| * @param objs object array to log - use this to perform lazy concatenation to avoid unconditional toString overhead |
| */ |
| public void fine(final Object... objs) { |
| log(Level.FINE, objs); |
| } |
| |
| /** |
| * Shorthand for outputting a log string as log level |
| * {@link java.util.logging.Level#CONFIG} on this logger |
| * @param str the string to log |
| */ |
| public void config(final String str) { |
| log(Level.CONFIG, str); |
| } |
| |
| /** |
| * Shorthand for outputting a log string as log level |
| * {@link java.util.logging.Level#CONFIG} on this logger |
| * @param objs object array to log - use this to perform lazy concatenation to avoid unconditional toString overhead |
| */ |
| public void config(final Object... objs) { |
| log(Level.CONFIG, objs); |
| } |
| |
| /** |
| * Shorthand for outputting a log string as log level |
| * {@link java.util.logging.Level#INFO} on this logger |
| * @param str the string to log |
| */ |
| public void info(final String str) { |
| log(Level.INFO, str); |
| } |
| |
| /** |
| * Shorthand for outputting a log string as log level |
| * {@link java.util.logging.Level#FINE} on this logger |
| * @param objs object array to log - use this to perform lazy concatenation to avoid unconditional toString overhead |
| */ |
| public void info(final Object... objs) { |
| log(Level.INFO, objs); |
| } |
| |
| /** |
| * Shorthand for outputting a log string as log level |
| * {@link java.util.logging.Level#WARNING} on this logger |
| * @param str the string to log |
| */ |
| public void warning(final String str) { |
| log(Level.WARNING, str); |
| } |
| |
| /** |
| * Shorthand for outputting a log string as log level |
| * {@link java.util.logging.Level#FINE} on this logger |
| * @param objs object array to log - use this to perform lazy concatenation to avoid unconditional toString overhead |
| */ |
| public void warning(final Object... objs) { |
| log(Level.WARNING, objs); |
| } |
| |
| /** |
| * Shorthand for outputting a log string as log level |
| * {@link java.util.logging.Level#SEVERE} on this logger |
| * @param str the string to log |
| */ |
| public void severe(final String str) { |
| log(Level.SEVERE, str); |
| } |
| |
| /** |
| * Shorthand for outputting a log string as log level |
| * {@link java.util.logging.Level#FINE} on this logger |
| * @param objs object array to log - use this to perform lazy concatenation to avoid unconditional toString overhead |
| */ |
| public void severe(final Object... objs) { |
| log(Level.SEVERE, objs); |
| } |
| |
| /** |
| * Output log line on this logger at a given level of verbosity |
| * @see java.util.logging.Level |
| * |
| * @param level minimum log level required for logging to take place |
| * @param str string to log |
| */ |
| public void log(final Level level, final String str) { |
| if (isEnabled) { |
| final StringBuilder sb = new StringBuilder(); |
| for (int i = 0 ; i < indent ; i++) { |
| sb.append(' '); |
| } |
| sb.append(str); |
| logger.log(level, sb.toString()); |
| } |
| } |
| |
| /** |
| * Output log line on this logger at a given level of verbosity |
| * @see java.util.logging.Level |
| * |
| * @param level minimum log level required for logging to take place |
| * @param objs objects for which to invoke toString and concatenate to log |
| */ |
| public void log(final Level level, final Object... objs) { |
| if (isEnabled) { |
| final StringBuilder sb = new StringBuilder(); |
| for (int i = 0 ; i < indent ; i++) { |
| sb.append(' '); |
| } |
| for (final Object obj : objs) { |
| sb.append(obj); |
| } |
| logger.log(level, sb.toString()); |
| } |
| } |
| } |