package org.apache.logging.log4j.core.pattern;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import org.apache.logging.log4j.core.LogEvent;
import org.apache.logging.log4j.core.config.Configuration;
import org.apache.logging.log4j.core.config.plugins.Plugin;
import org.apache.logging.log4j.core.impl.ThrowableFormatOptions;
import org.apache.logging.log4j.core.layout.PatternLayout;
import org.apache.logging.log4j.core.util.StringBuilderWriter;
import org.apache.logging.log4j.util.Strings;
@Plugin(name = "ThrowablePatternConverter", category = PatternConverter.CATEGORY)
@ConverterKeys({ "ex", "throwable", "exception" })
public class ThrowablePatternConverter extends LogEventPatternConverter {
protected final List<PatternFormatter> formatters;
private String rawOption;
private final boolean subShortOption;
private final boolean nonStandardLineSeparator;
protected final ThrowableFormatOptions options;
@Deprecated
protected ThrowablePatternConverter(final String name, final String style, final String[] options) {
this(name, style, options, null);
}
protected ThrowablePatternConverter(final String name, final String style, final String[] options, final Configuration config) {
super(name, style);
this.options = ThrowableFormatOptions.newInstance(options);
if (options != null && options.length > 0) {
rawOption = options[0];
}
if (this.options.getSuffix() != null) {
final PatternParser parser = PatternLayout.createPatternParser(config);
final List<PatternFormatter> parsedSuffixFormatters = parser.parse(this.options.getSuffix());
boolean hasThrowableSuffixFormatter = false;
for (final PatternFormatter suffixFormatter : parsedSuffixFormatters) {
if (suffixFormatter.handlesThrowable()) {
hasThrowableSuffixFormatter = true;
}
}
if (!hasThrowableSuffixFormatter) {
this.formatters = parsedSuffixFormatters;
} else {
final List<PatternFormatter> suffixFormatters = new ArrayList<>();
for (final PatternFormatter suffixFormatter : parsedSuffixFormatters) {
if (!suffixFormatter.handlesThrowable()) {
suffixFormatters.add(suffixFormatter);
}
}
this.formatters = suffixFormatters;
}
} else {
this.formatters = Collections.emptyList();
}
subShortOption = ThrowableFormatOptions.MESSAGE.equalsIgnoreCase(rawOption) ||
ThrowableFormatOptions.LOCALIZED_MESSAGE.equalsIgnoreCase(rawOption) ||
ThrowableFormatOptions.FILE_NAME.equalsIgnoreCase(rawOption) ||
ThrowableFormatOptions.LINE_NUMBER.equalsIgnoreCase(rawOption) ||
ThrowableFormatOptions.METHOD_NAME.equalsIgnoreCase(rawOption) ||
ThrowableFormatOptions.CLASS_NAME.equalsIgnoreCase(rawOption);
nonStandardLineSeparator = !Strings.LINE_SEPARATOR.equals(this.options.getSeparator());
}
public static ThrowablePatternConverter newInstance(final Configuration config, final String[] options) {
return new ThrowablePatternConverter("Throwable", "throwable", options, config);
}
@Override
public void format(final LogEvent event, final StringBuilder buffer) {
final Throwable t = event.getThrown();
if (subShortOption) {
formatSubShortOption(t, getSuffix(event), buffer);
}
else if (t != null && options.anyLines()) {
formatOption(t, getSuffix(event), buffer);
}
}
private void formatSubShortOption(final Throwable t, final String suffix, final StringBuilder buffer) {
StackTraceElement[] trace;
StackTraceElement throwingMethod = null;
int len;
if (t != null) {
trace = t.getStackTrace();
if (trace !=null && trace.length > 0) {
throwingMethod = trace[0];
}
}
if (t != null && throwingMethod != null) {
String toAppend = Strings.EMPTY;
if (ThrowableFormatOptions.CLASS_NAME.equalsIgnoreCase(rawOption)) {
toAppend = throwingMethod.getClassName();
}
else if (ThrowableFormatOptions.METHOD_NAME.equalsIgnoreCase(rawOption)) {
toAppend = throwingMethod.getMethodName();
}
else if (ThrowableFormatOptions.LINE_NUMBER.equalsIgnoreCase(rawOption)) {
toAppend = String.valueOf(throwingMethod.getLineNumber());
}
else if (ThrowableFormatOptions.MESSAGE.equalsIgnoreCase(rawOption)) {
toAppend = t.getMessage();
}
else if (ThrowableFormatOptions.LOCALIZED_MESSAGE.equalsIgnoreCase(rawOption)) {
toAppend = t.getLocalizedMessage();
}
else if (ThrowableFormatOptions.FILE_NAME.equalsIgnoreCase(rawOption)) {
toAppend = throwingMethod.getFileName();
}
len = buffer.length();
if (len > 0 && !Character.isWhitespace(buffer.charAt(len - 1))) {
buffer.append(' ');
}
buffer.append(toAppend);
if (Strings.isNotBlank(suffix)) {
buffer.append(' ');
buffer.append(suffix);
}
}
}
private void formatOption(final Throwable throwable, final String suffix, final StringBuilder buffer) {
final int len = buffer.length();
if (len > 0 && !Character.isWhitespace(buffer.charAt(len - 1))) {
buffer.append(' ');
}
if (!options.allLines() || nonStandardLineSeparator || Strings.isNotBlank(suffix)) {
final StringWriter w = new StringWriter();
throwable.printStackTrace(new PrintWriter(w));
final String[] array = w.toString().split(Strings.LINE_SEPARATOR);
final int limit = options.minLines(array.length) - 1;
final boolean suffixNotBlank = Strings.isNotBlank(suffix);
for (int i = 0; i <= limit; ++i) {
buffer.append(array[i]);
if (suffixNotBlank) {
buffer.append(' ');
buffer.append(suffix);
}
if (i < limit) {
buffer.append(options.getSeparator());
}
}
} else {
throwable.printStackTrace(new PrintWriter(new StringBuilderWriter(buffer)));
}
}
@Override
public boolean handlesThrowable() {
return true;
}
protected String getSuffix(final LogEvent event) {
if (formatters.isEmpty()) {
return Strings.EMPTY;
}
final StringBuilder toAppendTo = new StringBuilder();
for (int i = 0, size = formatters.size(); i < size; i++) {
formatters.get(i).format(event, toAppendTo);
}
return toAppendTo.toString();
}
public ThrowableFormatOptions getOptions() {
return options;
}
}