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Dynamic Dependency Injection with different ways to manage the resolver-strategy
/*
* 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.core.config.plugins.Plugin;
import org.apache.logging.log4j.core.layout.PatternLayout;
/**
* Equals pattern converter.
*/
@Plugin(name = "equals", category = PatternConverter.CATEGORY)
@ConverterKeys({ "equals" })
public final class EqualsReplacementConverter extends LogEventPatternConverter {
/**
* Gets an instance of the class.
*
* @param config
* The current Configuration.
* @param options
* pattern options, an array of three elements: pattern, testString, and substitution.
* @return instance of class.
*/
public static EqualsReplacementConverter newInstance(final Configuration config, final String[] options) {
if (options.length != 3) {
LOGGER.error("Incorrect number of options on equals. Expected 3 received " + options.length);
return null;
}
if (options[0] == null) {
LOGGER.error("No pattern supplied on equals");
return null;
}
if (options[1] == null) {
LOGGER.error("No test string supplied on equals");
return null;
}
if (options[2] == null) {
LOGGER.error("No substitution supplied on equals");
return null;
}
final String p = options[1];
final PatternParser parser = PatternLayout.createPatternParser(config);
final List formatters = parser.parse(options[0]);
return new EqualsReplacementConverter(formatters, p, options[2]);
}
private final List formatters;
private final String substitution;
private final String testString;
/**
* Construct the converter.
*
* @param formatters
* The PatternFormatters to generate the text to manipulate.
* @param testString
* The test string.
* @param substitution
* The substitution string.
*/
private EqualsReplacementConverter(final List formatters, final String testString,
final String substitution) {
super("equals", "equals");
this.testString = testString;
this.substitution = substitution;
this.formatters = formatters;
}
/**
* {@inheritDoc}
*/
@Override
public void format(final LogEvent event, final StringBuilder toAppendTo) {
final StringBuilder buf = new StringBuilder();
for (final PatternFormatter formatter : formatters) {
formatter.format(event, buf);
}
final String string = buf.toString();
toAppendTo.append(testString.equals(string) ? substitution : string);
}
}