| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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 org.apache.logging.log4j.core.pattern; |
| |
| import java.util.List; |
| |
| import org.apache.logging.log4j.core.LogEvent; |
| import org.apache.logging.log4j.core.config.Configuration; |
| import org.apache.logging.log4j.plugins.Plugin; |
| import org.apache.logging.log4j.core.layout.PatternLayout; |
| import org.apache.logging.log4j.util.PerformanceSensitive; |
| |
| /** |
| * VariablesNotEmpty pattern converter. |
| */ |
| @Plugin(name = "notEmpty", category = PatternConverter.CATEGORY) |
| @ConverterKeys({ "notEmpty", "varsNotEmpty", "variablesNotEmpty", }) |
| @PerformanceSensitive("allocation") |
| public final class VariablesNotEmptyReplacementConverter extends LogEventPatternConverter { |
| |
| private final List<PatternFormatter> formatters; |
| |
| /** |
| * Constructs the converter. |
| * |
| * @param formatters |
| * The PatternFormatters to generate the text to manipulate. |
| */ |
| private VariablesNotEmptyReplacementConverter(final List<PatternFormatter> formatters) { |
| super("notEmpty", "notEmpty"); |
| this.formatters = formatters; |
| } |
| |
| /** |
| * Gets an instance of the class. |
| * |
| * @param config |
| * The current Configuration. |
| * @param options |
| * pattern options, may be null. |
| * @return instance of class. |
| */ |
| public static VariablesNotEmptyReplacementConverter newInstance(final Configuration config, |
| final String[] options) { |
| if (options.length != 1) { |
| LOGGER.error("Incorrect number of options on varsNotEmpty. Expected 1 received " + options.length); |
| return null; |
| } |
| if (options[0] == null) { |
| LOGGER.error("No pattern supplied on varsNotEmpty"); |
| return null; |
| } |
| final PatternParser parser = PatternLayout.createPatternParser(config); |
| final List<PatternFormatter> formatters = parser.parse(options[0]); |
| return new VariablesNotEmptyReplacementConverter(formatters); |
| } |
| |
| /** |
| * {@inheritDoc} |
| */ |
| @Override |
| public void format(final LogEvent event, final StringBuilder toAppendTo) { |
| final int start = toAppendTo.length(); |
| boolean allVarsEmpty = true; |
| boolean hasVars = false; |
| for (int i = 0; i < formatters.size(); i++) { |
| final PatternFormatter formatter = formatters.get(i); |
| final int formatterStart = toAppendTo.length(); |
| formatter.format(event, toAppendTo); |
| if (formatter.getConverter().isVariable()) { |
| hasVars = true; |
| allVarsEmpty = allVarsEmpty && (toAppendTo.length() == formatterStart); |
| } |
| } |
| if (!hasVars || allVarsEmpty) { |
| toAppendTo.setLength(start); // remove formatter results |
| } |
| } |
| } |