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/*
 * Copyright 2004-2014 H2 Group. Multiple-Licensed under the MPL 2.0,
 * and the EPL 1.0 (http://h2database.com/html/license.html).
 * Initial Developer: H2 Group
 */
package studio.raptor.sqlparser.fast.value;

import java.sql.PreparedStatement;
import java.sql.SQLException;
import studio.raptor.sqlparser.fast.api.ErrorCode;
import studio.raptor.sqlparser.fast.message.ParseException;
import studio.raptor.sqlparser.fast.util.MathUtils;

/**
 * Implementation of the SMALLINT data type.
 */
public class ValueShort extends Value {

  /**
   * The precision in digits.
   */
  static final int PRECISION = 5;

  /**
   * The maximum display size of a short.
   * Example: -32768
   */
  static final int DISPLAY_SIZE = 6;

  private final short value;

  private ValueShort(short value) {
    this.value = value;
  }

  private static ValueShort checkRange(int x) {
    if (x < Short.MIN_VALUE || x > Short.MAX_VALUE) {
      throw ParseException.get(ErrorCode.NUMERIC_VALUE_OUT_OF_RANGE_1,
          Integer.toString(x));
    }
    return ValueShort.get((short) x);
  }

  /**
   * Get or create a short value for the given short.
   *
   * @param i the short
   * @return the value
   */
  public static ValueShort get(short i) {
    return (ValueShort) Value.cache(new ValueShort(i));
  }

  @Override
  public Value add(Value v) {
    ValueShort other = (ValueShort) v;
    return checkRange(value + other.value);
  }

  @Override
  public int getSignum() {
    return Integer.signum(value);
  }

  @Override
  public Value negate() {
    return checkRange(-(int) value);
  }

  @Override
  public Value subtract(Value v) {
    ValueShort other = (ValueShort) v;
    return checkRange(value - other.value);
  }

  @Override
  public Value multiply(Value v) {
    ValueShort other = (ValueShort) v;
    return checkRange(value * other.value);
  }

  @Override
  public Value divide(Value v) {
    ValueShort other = (ValueShort) v;
    if (other.value == 0) {
      throw ParseException.get(ErrorCode.DIVISION_BY_ZERO_1, getSQL());
    }
    return ValueShort.get((short) (value / other.value));
  }

  @Override
  public Value modulus(Value v) {
    ValueShort other = (ValueShort) v;
    if (other.value == 0) {
      throw ParseException.get(ErrorCode.DIVISION_BY_ZERO_1, getSQL());
    }
    return ValueShort.get((short) (value % other.value));
  }

  @Override
  public String getSQL() {
    return getString();
  }

  @Override
  public int getType() {
    return Value.SHORT;
  }

  @Override
  public short getShort() {
    return value;
  }

  @Override
  protected int compareSecure(Value o, CompareMode mode) {
    ValueShort v = (ValueShort) o;
    return MathUtils.compareInt(value, v.value);
  }

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

  @Override
  public long getPrecision() {
    return PRECISION;
  }

  @Override
  public int hashCode() {
    return value;
  }

  @Override
  public Object getObject() {
    return Short.valueOf(value);
  }

  @Override
  public void set(PreparedStatement prep, int parameterIndex)
      throws SQLException {
    prep.setShort(parameterIndex, value);
  }

  @Override
  public int getDisplaySize() {
    return DISPLAY_SIZE;
  }

  @Override
  public boolean equals(Object other) {
    return other instanceof ValueShort && value == ((ValueShort) other).value;
  }

}