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Think Machine - A Fading Suns character generator (random character creation)
There is a newer version: 0.10.5
package com.softwaremagico.tm.character.factions;

/*-
 * #%L
 * Think Machine (Core)
 * %%
 * Copyright (C) 2017 - 2018 Softwaremagico
 * %%
 * This software is designed by Jorge Hortelano Otero. Jorge Hortelano Otero
 *  Valencia (Spain).
 *
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free Software
 * Foundation; either version 2 of the License, or (at your option) any later
 * version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; If not, see .
 * #L%
 */

import com.softwaremagico.tm.InvalidXmlElementException;
import com.softwaremagico.tm.character.CharacterPlayer;
import com.softwaremagico.tm.character.exceptions.RestrictedElementException;
import com.softwaremagico.tm.character.exceptions.UnofficialElementNotAllowedException;
import com.softwaremagico.tm.random.RandomSelector;
import com.softwaremagico.tm.random.exceptions.InvalidRandomElementSelectedException;
import com.softwaremagico.tm.random.selectors.FactionPreferences;
import com.softwaremagico.tm.random.selectors.IRandomPreference;

import java.util.Collection;
import java.util.Set;

public class RandomFaction extends RandomSelector {

    public RandomFaction(CharacterPlayer characterPlayer, Set> preferences) throws InvalidXmlElementException,
            RestrictedElementException, UnofficialElementNotAllowedException {
        super(characterPlayer, preferences);
    }

    @Override
    public void assign() throws InvalidFactionException, InvalidRandomElementSelectedException {
        try {
            getCharacterPlayer().setFaction(selectElementByWeight());
        } catch (RestrictedElementException e) {
            throw new InvalidFactionException("Faction is restricted.", e);
        } catch (UnofficialElementNotAllowedException e) {
            throw new InvalidFactionException("Faction is not official.", e);
        }
    }

    @Override
    protected Collection getAllElements() throws InvalidXmlElementException {
        return FactionsFactory.getInstance().getElements(getCharacterPlayer().getLanguage(), getCharacterPlayer().getModuleName());
    }

    @Override
    protected int getWeight(Faction faction) throws InvalidRandomElementSelectedException {
        // Humans only humans factions.
        if (!faction.getRestrictedToRaces().isEmpty() && getCharacterPlayer().getRace() != null &&
                !faction.getRestrictedToRaces().contains(getCharacterPlayer().getRace())) {
            throw new InvalidRandomElementSelectedException("Faction '" + faction + "' restricted for race '" + faction.getRestrictedToRaces()
                    + "'. Character is '" + getCharacterPlayer().getRace() + "'.");
        }
        // Specialization desired.
        final FactionPreferences selectedFactionGroup = FactionPreferences.getSelected(getPreferences());
        if (selectedFactionGroup != null) {
            if (faction.getFactionGroup() != null && !faction.getFactionGroup().name().equalsIgnoreCase(selectedFactionGroup.name())) {
                // Different faction than selected.
                throw new InvalidRandomElementSelectedException("Faction '" + faction + "' not in preferences selection '" + selectedFactionGroup + "'.");
            }
        } else
            // No faction preference selected. Xeno factions has preferences by its own factions.
            if (getCharacterPlayer().getRace() != null && getCharacterPlayer().getRace().isXeno() && faction.getRestrictedToRaces().size() == 1 &&
                    faction.getRestrictedToRaces().contains(getCharacterPlayer().getRace())) {
                return 100;
            }
        return 1;
    }

    @Override
    protected void assignIfMandatory(Faction element) throws InvalidXmlElementException {
        //Nothing yet.
    }

    @Override
    protected void assignMandatoryValues(Set mandatoryValues) throws InvalidXmlElementException {
        //Nothing yet.
    }
}