net.java.truelicense.ui.wizard.BasicWizardModel Maven / Gradle / Ivy

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The TrueLicense UI module provides a user interface technology independent model for wizard dialogs in general and license management wizard dialogs in particular.

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/*
 * Copyright (C) 2005-2015 Schlichtherle IT Services.
 * All rights reserved. Use is subject to license terms.
 */
package net.java.truelicense.ui.wizard;

import java.util.*;
import net.java.truelicense.core.util.Objects;

/**
 * A basic implementation of a wizard model.
 *
 * @param   the type of the wizard's states.
 * @param   the type of the wizard's views.
 * @since  TrueLicense 2.3
 * @author Christian Schlichtherle
 */
public class BasicWizardModel implements WizardModel {

    /**
     * Creates a new wizard model for the given enum class.
     * The model will have no views and it's current state will be the first
     * enum object.
     *
     * @param clazz the clazz of the enum type which represents the wizard's
     *              state.
     * @param  the enum type of the wizard's states.
     * @param  the type of the wizard's views.
     */
    public static , V> WizardModel create(
            final Class clazz) {
        return new BasicWizardModel(new EnumMap(clazz),
                clazz.getEnumConstants()[0]);
    }

    private final Map views;
    private S state;

    /**
     * Constructs a new wizard model with the given map of views and state.
     *
     * @param views the map of views, which will be shared with the caller.
     * @param state the initial state of the constructed model;
     */
    protected BasicWizardModel(final Map views, final S state) {
        this.views = Objects.requireNonNull(views);
        this.state = Objects.requireNonNull(state);
    }

    @Override public S currentState() { return state; }

    @Override public void currentState(final S state) {
        this.state = Objects.requireNonNull(state);
    }

    @Override public V view(S state) { return views.get(state); }

    @Override public void view(S state, V view) {
        views.put(state, Objects.requireNonNull(view));
    }
}