EntryBuilder.java

package de.japrost.jabudget.domain.account;

import java.util.Optional;

/**
 * Builder for {@link Entry}.
 */
public class EntryBuilder {

    private String accountId;
    private String code;
    private String subject;

    /**
     * Create an empty builder.
     */
    public EntryBuilder() {
    }

    /**
     * Create a builder by example.
     *
     * @param example the example to use. MAY BE {@code null}.
     */
    public EntryBuilder(final Entry example) {
        if (example != null) {
            this.accountId = example.getAccountId();
            this.code = example.getCode();
            this.subject = example.getSubject();
        }
    }

    /**
     * Factory for a an empty builder.
     *
     * @return a new builder.
     */
    public static EntryBuilder builder() {
        return new EntryBuilder();
    }

    /**
     * Factory for a builder by example.
     *
     * @param example the example to use. MAY BE {@code null}.
     * @return a builder filled with value of example.
     */
    public static EntryBuilder builder(Entry example) {
        return new EntryBuilder(example);
    }
    /**
     * Build the result.
     *
     * @return a new instance.
     */
    public Entry build() {
        final Entry result = new Entry(accountId,code,subject);
        return result;
    }


    /**
     * Build if the result would be valid.
     *
     * @return a instance or an empty optional.
     */
    public Optional<Entry> buildOptional() {
        // TODO where to put this validation?
        if (accountId == null || code == null || subject == null) {
            return Optional.empty();
        }
        final Entry result = new Entry(accountId,code,subject);
        return Optional.of(result);
    }

    /**
     * @see Entry#getAccountId()
     */
    public void setAccountId(String accountId) {
        this.accountId = accountId;
    }

    /**
     * @see Entry#getCode()
     */
    public void setCode(String code) {
        this.code = code;
    }

    /**
     * @see Entry#getSubject()
     */
    public void setSubject(String subject) {
        this.subject = subject;
    }
}