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package com.github.smartbuf.node.basic;

import com.github.smartbuf.node.Node;
import com.github.smartbuf.node.NodeType;
import com.github.smartbuf.utils.NumberUtils;

/**
 * VarintNode represents all number like byte/short/int/long.
 *
 * @author sulin
 * @since 2019-05-08 21:00:46
 */
public final class VarintNode extends Node {

    private final static VarintNode[] TABLE = new VarintNode[256];

    static {
        for (int i = 0; i < TABLE.length; i++) {
            TABLE[i] = new VarintNode(NumberUtils.uintToInt(i));
        }
    }

    private final long value;

    private VarintNode(long value) {
        this.value = value;
    }

    public static VarintNode valueOf(byte b) {
        return valueOf((long) b);
    }

    public static VarintNode valueOf(Byte b) {
        return valueOf(b.byteValue());
    }

    public static VarintNode valueOf(short s) {
        return valueOf((long) s);
    }

    public static VarintNode valueOf(Short s) {
        return valueOf(s.shortValue());
    }

    public static VarintNode valueOf(int i) {
        return valueOf((long) i);
    }

    public static VarintNode valueOf(Integer i) {
        return valueOf(i.intValue());
    }

    public static VarintNode valueOf(long l) {
        long ul = NumberUtils.intToUint(l);
        if (ul >= 0 && ul < TABLE.length) {
            return TABLE[(int) ul];
        }
        return new VarintNode(l);
    }

    public static VarintNode valueOf(Long l) {
        return valueOf(l.longValue());
    }

    @Override
    public Object value() {
        return value;
    }

    @Override
    public NodeType type() {
        return NodeType.VARINT;
    }
}