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

Introduction

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

Source

/*
 * 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 com.google.common.collect.ImmutableSet.Builder;
import com.google.common.collect.Iterables;
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.constraints.NotNull;

public final class VoteBuilder {
    public static final Object[] EMPTY = new Object[0];
    @NotNull
    private Type type = Type.PREFERENCE;

    @NotNull
    private String preferenceString;

    public Type getType() {
        return type;
    }

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

    public String getPreferenceString() {
        return preferenceString;
    }

    public void setPreferenceString(String preferenceString) {
        this.preferenceString = preferenceString;
    }

    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("Unkown type " + type);
        }
    }

    private Vote<GenderedCandidate> createPreferenceVote(GenderedElection genderedElection) {
        Builder<GenderedCandidate> preferenceBuilder = ImmutableSet.builder();
        for (char c : preferenceString.toUpperCase().toCharArray()) {
            int candidateIndex = c - 'A';
            preferenceBuilder.add(Iterables.get(genderedElection.getCandidates(), candidateIndex));
        }
        return Vote.createPreferenceVote(genderedElection, preferenceBuilder.build());
    }

    public void validate(String objectName, String fieldPrefix, BindingResult bindingResult) {
        if ((type == Type.PREFERENCE) && preferenceString.isEmpty()) {
            bindingResult.addError(new FieldError(objectName, fieldPrefix + ".preferenceString", preferenceString,
                    false, new String[] { "emptyPreference" }, EMPTY,
                    "You must enter a preference if you selected it."));
        }

        if (containsDuplicateChars(preferenceString)) {
            bindingResult.addError(new FieldError(objectName, fieldPrefix + ".preferenceString", preferenceString,
                    false, new String[] { "duplicateCandidate" }, EMPTY,
                    "The Preference must not contain duplicate entries"));
        }
    }

    private static boolean containsDuplicateChars(String preferenceString) {
        for (int i = 0; i < preferenceString.length(); i++) {
            for (int j = i + 1; j < preferenceString.length(); j++) {
                if (preferenceString.charAt(i) == preferenceString.charAt(j)) {
                    return true;
                }
            }
        }

        return false;
    }

    private enum Type {
        PREFERENCE, NO, NOT_VOTED, INVALID
    }
}