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/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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package atom.app.kie;

import atom.app.Activity;
import atom.app.KieActivity;
import atom.kie.AbstractTask;
import org.kie.api.runtime.process.WorkItem;
import org.kie.api.runtime.process.WorkItemManager;
import org.kie.internal.runtime.StatefulKnowledgeSession;

import javax.xml.bind.annotation.XmlTransient;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.EventObject;

/**
 * Create event task work item handler.
 *
 * @author Eugene Shevchenko
 * @author Vladimir Ovcharov
 * @version 1.4 3/10/15
 */
public class CreateEventTaskWorkItemHandler extends AbstractTask {

    /**
     * Name of parameter which shows the fully qualified name of the
     * desired class.
     */
    public static final String EVENT_TYPE = "type";

    /**
     * Comma separated string of event parameter names, which should be
     * initialized.
     */
    public static final String EVENT_PARAM_NAMES = "keys";

    /**
     * Default constructor with KIE session.
     *
     * @param kieSession KIE session to use
     */
    public CreateEventTaskWorkItemHandler(
            final StatefulKnowledgeSession kieSession) {
        super(kieSession);
    }

    @Override
    @SuppressWarnings("unchecked")
    public void executeWorkItem(final WorkItem item,
                                final WorkItemManager manager) {
        final Activity activity =
                (Activity) getVariable(item, KieActivity.ACTIVITY);
        final String type = (String) item.getParameter(EVENT_TYPE);
        final String eventParamNames =
                (String) item.getParameter(EVENT_PARAM_NAMES);
        try {
            final Class eventClass = Class.forName(type);
            final Constructor constructor =
                    eventClass.getConstructor(Object.class);
            final EventObject instance =
                    (EventObject) constructor.newInstance(activity);
            if (eventParamNames != null && !eventParamNames.isEmpty()) {
                final String[] paramsNames = eventParamNames.split(",");
                for (final String paramName : paramsNames) {
                    final Object paramValue = getVariable(item, paramName);
                    final Field field = eventClass.getDeclaredField(paramName);
                    AccessController.doPrivileged(
                            new AccessiblePrivilegedAction(field));
                    field.set(instance, paramValue);
                }
            }
            activity.fireEvent(instance);
        } catch (ClassNotFoundException
                | InstantiationException
                | IllegalAccessException
                | NoSuchMethodException
                | InvocationTargetException
                | NoSuchFieldException e) {
            e.printStackTrace();
        }

        manager.completeWorkItem(item.getId(), item.getResults());
    }

    @Override
    public void abortWorkItem(final WorkItem item,
                              final WorkItemManager manager) {
        // Do nothing
    }

    /**
     * Provide accessible change.
     */
    @XmlTransient
    private static class AccessiblePrivilegedAction
            implements PrivilegedAction {
        /**
         * Field for accessible change.
         */
        private final transient Field field;

        /**
         * @param aField field to change accessible
         */
        AccessiblePrivilegedAction(final Field aField) {
            field = aField;
        }

        @Override
        public Void run() {
            field.setAccessible(true);
            return null; // nothing to return
        }
    }
}