package geniusweb.issuevalue;

import com.fasterxml.jackson.annotation.JsonValue;

/**
 * A value for a discrete issue. Constructor guarantees this is non-null and
 * non-empty. immutable.
 */
public class DiscreteValue implements Value {

	@JsonValue // serializes nicely but requires custom deserializer.
	private final String value;

	public DiscreteValue(String value) {
		if (value == null || value.isEmpty())
			throw new NullPointerException(
					"value must be non-null and non-empty");
		this.value = value;
	}

	@Override
	public int hashCode() {
		final int prime = 31;
		int result = 1;
		result = prime * result + ((value == null) ? 0 : value.hashCode());
		return result;
	}

	@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (obj == null)
			return false;
		if (getClass() != obj.getClass())
			return false;
		DiscreteValue other = (DiscreteValue) obj;
		if (value == null) {
			if (other.value != null)
				return false;
		} else if (!value.equals(other.value))
			return false;
		return true;
	}

	@Override
	public String toString() {
		return "\"" + value + "\"";
	}

	public String getValue() {
		return value;
	}
}