PostalAddress in Java using AutoValue

PostalAddress.java

/**
 * Encapsulates a postal address.
 */
@AutoValue
public abstract class PostalAddress {

  public static Builder builder() {
    return new AutoValue_PostalAddress.Builder();
  }
  
  public @Nullable abstract String getName();
  public abstract String getStreet1();
  public @Nullable abstract String getStreet2();
  public @Nullable abstract String getStreet3();
  public @Nullable abstract String getStreet4();
  public abstract String getCity();
  public abstract String getState();
  public abstract String getPostalCode();
  public abstract Builder toBuilder();

  public String toSingleLineStringForDisplay() {
    StringBuilder sb = new StringBuilder();
    sb.append(getStreet1()).append(", ");
    if (getStreet2() != null) {
      sb.append(getStreet2()).append(", ");
    }
    if (getStreet3() != null) {
      sb.append(getStreet3()).append(", ");
    }
    if (getStreet4() != null) {
      sb.append(getStreet4()).append(", ");
    }
    sb.append(getCity()).append(", ")
        .append(getState()).append(" ")
        .append(getPostalCode());
    return sb.toString();
  }
  
  @AutoValue.Builder
  public abstract static class Builder {
    
    public abstract Builder setName(@Nullable String value);
    public abstract Builder setStreet1(String value);
    public abstract Builder setStreet2(@Nullable String value);
    public abstract Builder setStreet3(@Nullable String value);
    public abstract Builder setStreet4(@Nullable String value);
    public abstract Builder setCity(String value);
    public abstract Builder setState(String value);
    public abstract Builder setPostalCode(String value);
    abstract PostalAddress build();
  }
}