net.scran24.user.client.survey.flat.StateManager.java Source code

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Here is the source code for net.scran24.user.client.survey.flat.StateManager.java

Source

/*
This file is part of Intake24.
    
 Crown copyright, 2012, 2013, 2014.
    
This software is licensed under the Open Government Licence 3.0:
    
http://www.nationalarchives.gov.uk/doc/open-government-licence/
*/

package net.scran24.user.client.survey.flat;

import java.util.logging.Logger;

import net.scran24.common.client.CurrentUser;
import net.scran24.user.client.survey.portionsize.experimental.PortionSizeScriptManager;

import org.workcraft.gwt.shared.client.Callback;
import org.workcraft.gwt.shared.client.Option;

import com.google.gwt.event.logical.shared.ValueChangeEvent;
import com.google.gwt.event.logical.shared.ValueChangeHandler;
import com.google.gwt.user.client.History;

/**
 * Manages client-side survey serialisation, cross-session persistence and
 * history.
 */
public class StateManager {
    private Survey currentState;
    private int historyEventCounter = 0;

    private final Logger log = Logger.getLogger(StateManager.class.getSimpleName());

    public final String version_id;
    public final String scheme_id;

    public Survey getCurrentState() {
        return currentState;
    }

    public void makeHistoryEntry() {
        // log.info("Making history entry #" + historyEventCounter);
        // new RuntimeException().printStackTrace();
        // log.info(SurveyXmlSerialiser.toXml(currentState));

        History.newItem(Integer.toString(historyEventCounter), false);
        StateManagerUtil.setHistoryState(CurrentUser.getUserInfo().userName, historyEventCounter, currentState);
        historyEventCounter++;
    }

    public void updateState(Survey newState, boolean makeHistoryEntry) {
        currentState = newState;

        if (makeHistoryEntry) {
            // log.info ("Making history entry");
            makeHistoryEntry();
        }

        StateManagerUtil.setLatestState(CurrentUser.getUserInfo().userName, currentState, scheme_id, version_id);
        // log.info("Updated latest state");

        // updateUi.call(newState);
    }

    public StateManager(Survey initialState, String scheme_id, String version_id, final Callback showNextPage,
            final PortionSizeScriptManager scriptManager) {
        this.scheme_id = scheme_id;
        this.version_id = version_id;
        this.currentState = initialState;

        log.info("Making initial history entry");
        makeHistoryEntry();

        History.addValueChangeHandler(new ValueChangeHandler<String>() {
            @Override
            public void onValueChange(ValueChangeEvent<String> event) {

                try {
                    final int state_id = Integer.parseInt(event.getValue());

                    StateManagerUtil.getHistoryState(CurrentUser.getUserInfo().userName, state_id, scriptManager)
                            .accept(new Option.SideEffectVisitor<Survey>() {
                                @Override
                                public void visitSome(Survey item) {
                                    log.info("Switching to historical state #" + state_id);
                                    updateState(item, false);
                                    showNextPage.call();
                                }

                                @Override
                                public void visitNone() {
                                    log.warning("Failed to load historical state, keeping current state");
                                }
                            });
                } catch (NumberFormatException e) {
                    // Ignore malformed state ids
                }
            }
        });
    }
}