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.
/**
 * 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 ch.qos.logback.core.spi.ContextAware;
import org.xml.sax.Attributes;

import ch.qos.logback.core.joran.spi.ActionException;
import ch.qos.logback.core.joran.spi.InterpretationContext;
import ch.qos.logback.core.spi.LifeCycle;
import ch.qos.logback.core.status.StatusListener;
import ch.qos.logback.core.util.OptionHelper;

public class StatusListenerAction extends Action {

    boolean inError = false;
    Boolean effectivelyAdded = null;
    StatusListener statusListener = null;

    public void begin(InterpretationContext ec, String name, Attributes attributes) throws ActionException {
        inError = false;
        effectivelyAdded = null;
        String className = attributes.getValue(CLASS_ATTRIBUTE);
        if (OptionHelper.isEmpty(className)) {
            addError("Missing class name for statusListener. Near [" + name + "] line " + getLineNumber(ec));
            inError = true;
            return;
        }

        try {
            statusListener = (StatusListener) OptionHelper.instantiateByClassName(className, StatusListener.class, context);
            effectivelyAdded = ec.getContext().getStatusManager().add(statusListener);
            if (statusListener instanceof ContextAware) {
                ((ContextAware) statusListener).setContext(context);
            }
            addInfo("Added status listener of type [" + className + "]");
            ec.pushObject(statusListener);
        } catch (Exception e) {
            inError = true;
            addError("Could not create an StatusListener of type [" + className + "].", e);
            throw new ActionException(e);
        }

    }

    public void finish(InterpretationContext ec) {
    }

    public void end(InterpretationContext ec, String e) {
        if (inError) {
            return;
        }
        if (isEffectivelyAdded() && statusListener instanceof LifeCycle) {
            ((LifeCycle) statusListener).start();
        }
        Object o = ec.peekObject();
        if (o != statusListener) {
            addWarn("The object at the of the stack is not the statusListener pushed earlier.");
        } else {
            ec.popObject();
        }
    }

    private boolean isEffectivelyAdded() {
        if (effectivelyAdded == null)
            return false;
        return effectivelyAdded;
    }
}