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/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.google.code.or.common.glossary;

import java.math.BigInteger;

import com.google.code.or.common.util.CodecUtils;

/**
 * 
 * @author Jingqi Xu
 * @see sql-common/pack.c net_store_length()
 */
public abstract class UnsignedLong extends Number implements Comparable {
	//
	private static final long serialVersionUID = -2263391850849681361L;

	//
	private static final UnsignedLong[] CACHE = new UnsignedLong[255];
	static {
		for(int i = 0; i < CACHE.length; i++) {
			CACHE[i] = new UnsignedLong4(i);
		}
	}
	
	/**
	 * 
	 */
	@Override
	public boolean equals(Object obj) {
		if(!(obj instanceof UnsignedLong)) return false;
		return this.doubleValue() == ((UnsignedLong)obj).doubleValue();
	}
	
	public int compareTo(UnsignedLong rhs) {
		return (this.doubleValue() < rhs.doubleValue()) ? -1 : ((this.doubleValue() == rhs.doubleValue()) ? 0 : 1);
	}

	/**
	 * 
	 */
	public static final UnsignedLong valueOf(long value) {
		if(value < 0) { // Convert to positive value
			return new UnsignedLongUnlimited(value);
		} else if(value < CACHE.length) {
			return CACHE[(int)value];
		} else if(value < Integer.MAX_VALUE) {
			return new UnsignedLong4((int)value);
		} else { // value < Long.MAX_VALUE)
			return new UnsignedLong8(value);
		}
	}
	
	/**
	 * 
	 */
	private static final class UnsignedLong4 extends UnsignedLong {
		//
		private static final long serialVersionUID = 6549354506227481646L;
		
		//
		private final int value;
		
		/**
		 * 
		 */
		private UnsignedLong4(int value) {
			this.value = value;
		}
		
		/**
		 * 
		 */
		@Override
		public int intValue() {
			return value;
		}

		@Override
		public long longValue() {
			return (long)value;
		}

		@Override
		public float floatValue() {
			return (float)value;
		}

		@Override
		public double doubleValue() {
			return (double)value;
		}
		
		/**
		 * 
		 */
		@Override
		public String toString() {
			return String.valueOf(value);
		}
		
		@Override
		public int hashCode() {
			return this.value;
		}
	}
	
	private static final class UnsignedLong8 extends UnsignedLong {
		//
		private static final long serialVersionUID = -314206857441911721L;
		
		//
		private final long value;
		
		/**
		 * 
		 */
		private UnsignedLong8(long value) {
			this.value = value;
		}
		
		/**
		 * 
		 */
		@Override
		public int intValue() {
			return (int)value;
		}

		@Override
		public long longValue() {
			return value;
		}

		@Override
		public float floatValue() {
			return (float)value;
		}

		@Override
		public double doubleValue() {
			return (double)value;
		}
		
		/**
		 * 
		 */
		@Override
		public String toString() {
			return String.valueOf(value);
		}
		
		@Override
		public int hashCode() {
			return (int)(value ^ (value >>> 32));
		}
	}
	
	private static final class UnsignedLongUnlimited extends UnsignedLong {
		//
		private static final long serialVersionUID = -5362638763306527191L;
		
		//
		private final BigInteger value;
		
		/**
		 * 
		 */
		private UnsignedLongUnlimited(long value) {
			this.value = new BigInteger(1, CodecUtils.toByteArray(value));
		}
		
		/**
		 * 
		 */
		@Override
		public int intValue() {
			return value.intValue();
		}

		@Override
		public long longValue() {
			return value.longValue();
		}

		@Override
		public float floatValue() {
			return value.floatValue();
		}

		@Override
		public double doubleValue() {
			return value.doubleValue();
		}
		
		/**
		 * 
		 */
		@Override
		public String toString() {
			return value.toString();
		}
		
		@Override
		public int hashCode() {
			return value.hashCode();
		}
	}
}