source: issuevalue/src/main/java/geniusweb/issuevalue/NumberValue.java

package geniusweb.issuevalue;

import java.math.BigDecimal;

import com.fasterxml.jackson.annotation.JsonValue;

/**
 * A value containing a number, that should be in some {@link NumberValueSet}.
 * immutable
 */
public class NumberValue implements Value {
        @JsonValue // deserializes nicely but needs custom deserializer.
        private final BigDecimal value;

        public NumberValue(String vnew) {
                this.value = new BigDecimal(vnew);
        }

        public NumberValue(BigDecimal vnew) {
                this.value = vnew;
        }

        public BigDecimal getValue() {
                return value;
        }

        @Override
        public String toString() {
                return value.toString();
        }

        @Override
        public int hashCode() {
                // WORKAROUND FOR BigDecimal hashCode. NOT auto generated.
                // Very large numbers and numbers that differ only in a fraction
                // beyond reach of double may get the same hashcode,
                // but this is not an issue as equal hashcode only indicates that
                // numbers MAY be equal.
                return Double.hashCode(value.doubleValue());
        }

        @Override
        public boolean equals(Object obj) {
                if (this == obj)
                        return true;
                if (obj == null)
                        return false;
                if (getClass() != obj.getClass())
                        return false;
                NumberValue other = (NumberValue) obj;
                if (value == null) {
                        if (other.value != null)
                                return false;
                } else if (value.compareTo(other.value) != 0)
                        // MANUAL FIX, DO NOT USE value.equals
                        return false;
                return true;
        }

}