Entry.java

package de.japrost.jabudget.domain.account;

import static java.util.Objects.requireNonNull;

import java.io.Serializable;

/**
 * An entry in an {@link Account}.<br>
 */
public class Entry extends AggregateMember implements Serializable {

    private static final long serialVersionUID = 1L;
    /** The identity of the Account the Entry resides in. */
    private final String accountId;
    /** The code of the entry. */
    private final String code;
    /** The subject of the entry */
    private final String subject;

    // TODO use jabudegt-utils with requireNonNull
    // TODO write tests that fields could not be null
    /**
     * Create an Entry.
     *
     * @param accountId the account id
     * @param code the code
     * @param subject the subject
     */
    public Entry(final String accountId, final String code, final String subject) {
        requireNonNull(accountId, "'accountId' MUST NOT be null.");
        requireNonNull(code, "'code' MUST NOT be null.");
        requireNonNull(subject, "'subject' MUST NOT be null.");
        this.accountId = accountId;
        this.code = code;
        this.subject = subject;
    }

    /**
     * Gets the identity of the Account the Entry resides in.
     *
     * @return the identity of the Account the Entry resides in
     */

    public String getAccountId() {
        return accountId;
    }

    /**
     * Gets the code of the entry.
     *
     * @return the code of the entry
     */
    public String getCode() {
        return code;
    }

    /**
     * Gets the subject of the entry.
     *
     * @return the subject of the entry
     */
    public String getSubject() {
        return subject;
    }

    /**
     * {@inheritDoc}
     * <p>
     * <strong>This implementation</strong> concats accountId and code.
     */

    @Override
    public String key() {
        return accountId + KEY_SEPARATOR + code;
    }

    /**
     * {@inheritDoc}
     * <p>
     * <strong>This implementation</strong> show all fields.
     */

    @Override
    public String toString() {
        StringBuilder builder = new StringBuilder();
        builder.append("Entry [accountId=").append(accountId).append(", code=").append(code).append(", subject=")
                .append(subject).append("]");
        return builder.toString();
    }

}