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();
  	}
  
  }