LoggerContextListenerModelHandler.java

package ch.qos.logback.classic.model.processor;

import ch.qos.logback.classic.LoggerContext;
import ch.qos.logback.classic.model.LoggerContextListenerModel;
import ch.qos.logback.classic.spi.LoggerContextListener;
import ch.qos.logback.core.Context;
import ch.qos.logback.core.model.Model;
import ch.qos.logback.core.model.processor.ModelHandlerBase;
import ch.qos.logback.core.model.processor.ModelHandlerException;
import ch.qos.logback.core.model.processor.ModelInterpretationContext;
import ch.qos.logback.core.spi.ContextAware;
import ch.qos.logback.core.spi.LifeCycle;
import ch.qos.logback.core.util.OptionHelper;

public class LoggerContextListenerModelHandler extends ModelHandlerBase {
    boolean inError = false;
    LoggerContextListener lcl;

    public LoggerContextListenerModelHandler(Context context) {
        super(context);
    }

    static public ModelHandlerBase makeInstance(Context context, ModelInterpretationContext ic) {
        return new LoggerContextListenerModelHandler(context);
    }

    @Override
    protected Class<LoggerContextListenerModel> getSupportedModelClass() {
        return LoggerContextListenerModel.class;
    }

    @Override
    public void handle(ModelInterpretationContext mic, Model model) throws ModelHandlerException {
        LoggerContextListenerModel lclModel = (LoggerContextListenerModel) model;

        String className = lclModel.getClassName();
        if (OptionHelper.isNullOrEmptyOrAllSpaces(className)) {
            addError("Empty class name for LoggerContextListener");
            inError = true;
        } else {
            className = mic.getImport(className);
        }

        try {
            lcl = (LoggerContextListener) OptionHelper.instantiateByClassName(className, LoggerContextListener.class,
                    context);

            if (lcl instanceof ContextAware) {
                ((ContextAware) lcl).setContext(context);
            }

            mic.pushObject(lcl);
            addInfo("Adding LoggerContextListener of type [" + className + "] to the object stack");

        } catch (Exception oops) {
            inError = true;
            addError("Could not create LoggerContextListener of type " + className + "].", oops);
        }
    }

    @Override
    public void postHandle(ModelInterpretationContext mic, Model model) throws ModelHandlerException {
        if (inError) {
            return;
        }
        Object o = mic.peekObject();

        if (o != lcl) {
            addWarn("The object on the top the of the stack is not the LoggerContextListener pushed earlier.");
        } else {
            if (lcl instanceof LifeCycle) {
                ((LifeCycle) lcl).start();
                addInfo("Starting LoggerContextListener");
            }
            ((LoggerContext) context).addListener(lcl);
            mic.popObject();
        }
    }
}