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With inspiration from other libraries
/**
* Logback: the reliable, generic, fast and flexible logging framework.
* Copyright (C) 1999-2015, QOS.ch. All rights reserved.
*
* This program and the accompanying materials are dual-licensed under
* either the terms of the Eclipse Public License v1.0 as published by
* the Eclipse Foundation
*
* or (per the licensee's choosing)
*
* under the terms of the GNU Lesser General Public License version 2.1
* as published by the Free Software Foundation.
*/
package ch.qos.logback.core.joran.action;
import java.util.Map;
import org.xml.sax.Attributes;
import ch.qos.logback.core.CoreConstants;
import ch.qos.logback.core.boolex.EventEvaluator;
import ch.qos.logback.core.joran.spi.InterpretationContext;
import ch.qos.logback.core.spi.LifeCycle;
import ch.qos.logback.core.util.OptionHelper;
abstract public class AbstractEventEvaluatorAction extends Action {
EventEvaluator evaluator;
boolean inError = false;
/**
* Instantiates an evaluator of the given class and sets its name.
*/
public void begin(InterpretationContext ec, String name, Attributes attributes) {
// Let us forget about previous errors (in this instance)
inError = false;
evaluator = null;
String className = attributes.getValue(CLASS_ATTRIBUTE);
if (OptionHelper.isEmpty(className)) {
className = defaultClassName();
addInfo("Assuming default evaluator class [" + className + "]");
}
if (OptionHelper.isEmpty(className)) {
className = defaultClassName();
inError = true;
addError("Mandatory \"" + CLASS_ATTRIBUTE + "\" attribute not set for ");
return;
}
String evaluatorName = attributes.getValue(Action.NAME_ATTRIBUTE);
if (OptionHelper.isEmpty(evaluatorName)) {
inError = true;
addError("Mandatory \"" + NAME_ATTRIBUTE + "\" attribute not set for ");
return;
}
try {
evaluator = (EventEvaluator) OptionHelper.instantiateByClassName(className, ch.qos.logback.core.boolex.EventEvaluator.class, context);
evaluator.setContext(this.context);
evaluator.setName(evaluatorName);
ec.pushObject(evaluator);
addInfo("Adding evaluator named [" + evaluatorName + "] to the object stack");
} catch (Exception oops) {
inError = true;
addError("Could not create evaluator of type " + className + "].", oops);
}
}
/**
* Returns a default class name in case the class attribute is not specified
*
* @return
*/
abstract protected String defaultClassName();
/**
* Once the children elements are also parsed, now is the time to activate the
* evaluator options.
*/
@SuppressWarnings("unchecked")
public void end(InterpretationContext ec, String e) {
if (inError) {
return;
}
if (evaluator instanceof LifeCycle) {
((LifeCycle) evaluator).start();
addInfo("Starting evaluator named [" + evaluator.getName() + "]");
}
Object o = ec.peekObject();
if (o != evaluator) {
addWarn("The object on the top the of the stack is not the evaluator pushed earlier.");
} else {
ec.popObject();
try {
Map> evaluatorMap = (Map>) context.getObject(CoreConstants.EVALUATOR_MAP);
if (evaluatorMap == null) {
addError("Could not find EvaluatorMap");
} else {
evaluatorMap.put(evaluator.getName(), evaluator);
}
} catch (Exception ex) {
addError("Could not set evaluator named [" + evaluator + "].", ex);
}
}
}
public void finish(InterpretationContext ec) {
}
}