source: trunk/src_apollo/org/apollo/util/NullableLong.java@ 315

package org.apollo.util;

/**
 * java.lang.Long does not allow:
 *      Long test = null;
 * 
 * This provides a simple nullable long value.
 * 
 * @author Brook Novak
 *
 */
public class NullableLong implements Comparable<NullableLong> {
        
        private long longValue;
        
        public NullableLong(long value) {
                this.longValue = value;
        }
        
        private NullableLong(Long value) {
                if (value == null) throw new NullPointerException();
                this.longValue = value.longValue();
        }
        
        public static NullableLong fromLong(Long value) {
                if (value == null) return null;
                return new NullableLong(value);
        }

        public int compareTo(NullableLong o) {
                return new Long(longValue).compareTo(new Long(o.longValue));
        }

        @Override
        public boolean equals(Object obj) {
                if (obj == null) return false;
                
                if (obj instanceof NullableLong) {
                        return longValue == ((NullableLong)obj).longValue;
                }
                
                return false;
        }

        @Override
        public int hashCode() {
                return new Long(longValue).intValue();
        }

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

        public long getLongValue() {
                return longValue;
        }

}