info.gehrels.voting.web.VoteBuilder.java Source code

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Here is the source code for info.gehrels.voting.web.VoteBuilder.java

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/*
 * Copyright  2014 Benjamin Gehrels
 *
 * This file is part of The Single Transferable Vote Elections Web Interface.
 *
 * The Single Transferable Vote Elections Web Interface is free software: you can redistribute it and/or modify it under
 * the terms of the GNU Affero General Public License as published by the Free Software Foundation, either version 3 of
 * the License, or (at your option) any later version.
 *
 * The Single Transferable Vote Elections Web Interface 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
 * Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License along with The Single Transferable Vote
 * Elections Web Interface. If not, see <http://www.gnu.org/licenses/>.
 */
package info.gehrels.voting.web;

import com.google.common.base.Optional;
import com.google.common.collect.ImmutableSet;
import info.gehrels.voting.Vote;
import info.gehrels.voting.genderedElections.GenderedCandidate;
import info.gehrels.voting.genderedElections.GenderedElection;
import org.springframework.validation.BindingResult;
import org.springframework.validation.FieldError;

import javax.validation.Valid;
import javax.validation.constraints.NotNull;
import java.util.ArrayList;
import java.util.List;
import java.util.SortedMap;
import java.util.TreeMap;

public final class VoteBuilder {
    @NotNull
    private VoteType type = VoteType.PREFERENCE;

    @Valid
    @NotNull
    private List<PreferenceBuilder> preferencesByCandidateIdx = new ArrayList<>();

    public VoteType getType() {
        return type;
    }

    public void setType(VoteType type) {
        this.type = type;
    }

    public List<PreferenceBuilder> getPreferencesByCandidateIdx() {
        return preferencesByCandidateIdx;
    }

    public void setPreferencesByCandidateIdx(List<PreferenceBuilder> preferencesByCandidateIdx) {
        this.preferencesByCandidateIdx = preferencesByCandidateIdx;
    }

    public Optional<Vote<GenderedCandidate>> createVote(GenderedElection genderedElection) {
        switch (type) {
        case PREFERENCE:
            return Optional.of(createPreferenceVote(genderedElection));
        case NO:
            return Optional.of(Vote.createNoVote(genderedElection));
        case INVALID:
            return Optional.of(Vote.createInvalidVote(genderedElection));
        case NOT_VOTED:
            return Optional.absent();
        default:
            throw new IllegalStateException("Unknown type " + type);
        }
    }

    private Vote<GenderedCandidate> createPreferenceVote(GenderedElection genderedElection) {
        SortedMap<Long, GenderedCandidate> candidatesByPreferences = new TreeMap<>();

        for (int i = 0; (i < genderedElection.getCandidates().size())
                && (i < preferencesByCandidateIdx.size()); i++) {
            PreferenceBuilder preference = preferencesByCandidateIdx.get(i);
            if (preference.getValue() != null) {
                candidatesByPreferences.put(preference.getValue(),
                        genderedElection.getCandidates().asList().get(i));
            }
        }

        return Vote.createPreferenceVote(genderedElection, ImmutableSet.copyOf(candidatesByPreferences.values()));
    }

    public void validate(String objectName, String fieldPrefix, BindingResult bindingResult) {
        if (type == VoteType.PREFERENCE) {
            if (allNullOrEmpty(preferencesByCandidateIdx)) {
                bindingResult.addError(new FieldError(objectName, fieldPrefix + ".preferencesByCandidateIdx", "",
                        true, new String[] { "emptyPreference" }, new Object[] {},
                        "You must enter a preference if you have selected it."));
            } else if (containsDuplicates(preferencesByCandidateIdx)) {
                bindingResult.addError(new FieldError(objectName, fieldPrefix + ".preferencesByCandidateIdx", "",
                        true, new String[] { "duplicatesInPreference" }, new Object[] {},
                        "You must enter a duplicate free preference."));
            }
        } else {
            if (!allNullOrEmpty(preferencesByCandidateIdx)) {
                bindingResult.addError(new FieldError(objectName, fieldPrefix + ".preferencesByCandidateIdx", "",
                        true, new String[] { "noPreferenceAllowed" }, new Object[] {},
                        "You must not enter a preference for no, invalid or non casted votes."));
            }
        }
    }

    private boolean allNullOrEmpty(List<PreferenceBuilder> preferenceBuilders) {
        for (PreferenceBuilder preferenceBuilder : preferenceBuilders) {
            if (!isEmptyPreference(preferenceBuilder)) {
                return false;
            }
        }

        return true;
    }

    private boolean isEmptyPreference(PreferenceBuilder preferenceBuilder) {
        return (preferenceBuilder == null) || (preferenceBuilder.getValue() == null);
    }

    private boolean containsDuplicates(List<PreferenceBuilder> list) {
        for (int i = 0; i < list.size(); i++) {
            for (int j = i + 1; j < list.size(); j++) {
                if (!isEmptyPreference(list.get(i)) && list.get(i).equals(list.get(j))) {
                    return true;
                }
            }
        }

        return false;
    }

}