/**
* Copyright 2010 The Apache Software Foundation
*
* 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.alibaba.wasp.jdbc.value;
import com.alibaba.wasp.SQLErrorCode;
import com.alibaba.wasp.jdbc.JdbcException;
import com.alibaba.wasp.util.MathUtils;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.sql.PreparedStatement;
import java.sql.SQLException;
/**
* Implementation of the BIGINT data type.
*/
public class ValueLong extends Value {
/**
* The largest Long value, as a BigInteger.
*/
public static final BigInteger MAX = BigInteger.valueOf(Long.MAX_VALUE);
/**
* The smallest Long value, as a BigDecimal.
*/
public static final BigDecimal MIN_BD = BigDecimal.valueOf(Long.MIN_VALUE);
/**
* The precision in digits.
*/
public static final int PRECISION = 19;
/**
* The maximum display size of a long. Example: 9223372036854775808
*/
public static final int DISPLAY_SIZE = 20;
private static final BigInteger MIN = BigInteger.valueOf(Long.MIN_VALUE);
private static final int STATIC_SIZE = 100;
private static final ValueLong[] STATIC_CACHE;
private final long value;
public static final ValueLong ZERO = new ValueLong(0);
static {
STATIC_CACHE = new ValueLong[STATIC_SIZE];
for (int i = 0; i < STATIC_SIZE; i++) {
STATIC_CACHE[i] = new ValueLong(i);
}
}
private ValueLong(long value) {
this.value = value;
}
public Value add(Value v) {
ValueLong other = (ValueLong) v;
long result = value + other.value;
int sv = Long.signum(value);
int so = Long.signum(other.value);
int sr = Long.signum(result);
// if the operands have different signs overflow can not occur
// if the operands have the same sign,
// and the result has a different sign, then it is an overflow
// it can not be an overflow when one of the operands is 0
if (sv != so || sr == so || sv == 0 || so == 0) {
return ValueLong.get(result);
}
throw getOverflow();
}
public int getSignum() {
return Long.signum(value);
}
public Value negate() {
if (value == Long.MIN_VALUE) {
throw getOverflow();
}
return ValueLong.get(-value);
}
private JdbcException getOverflow() {
return JdbcException.get(SQLErrorCode.NUMERIC_VALUE_OUT_OF_RANGE_1,
Long.toString(value));
}
public Value subtract(Value v) {
ValueLong other = (ValueLong) v;
int sv = Long.signum(value);
int so = Long.signum(other.value);
// if the operands have the same sign, then overflow can not occur
// if the second operand is 0, then overflow can not occur
if (sv == so || so == 0) {
return ValueLong.get(value - other.value);
}
// now, if the other value is Long.MIN_VALUE, it must be an overflow
// x - Long.MIN_VALUE overflows for x>=0
return add(other.negate());
}
private static boolean isInteger(long a) {
return a >= Integer.MIN_VALUE && a <= Integer.MAX_VALUE;
}
public Value multiply(Value v) {
ValueLong other = (ValueLong) v;
long result = value * other.value;
if (value == 0 || value == 1 || other.value == 0 || other.value == 1) {
return ValueLong.get(result);
}
if (isInteger(value) && isInteger(other.value)) {
return ValueLong.get(result);
}
// just checking one case is not enough: Long.MIN_VALUE * -1
// probably this is correct but I'm not sure
// if(result / value == other.value && result / other.value == value) {
// return ValueLong.get(result);
// }
BigInteger bv = BigInteger.valueOf(value);
BigInteger bo = BigInteger.valueOf(other.value);
BigInteger br = bv.multiply(bo);
if (br.compareTo(MIN) < 0 || br.compareTo(MAX) > 0) {
throw getOverflow();
}
return ValueLong.get(br.longValue());
}
public Value divide(Value v) {
ValueLong other = (ValueLong) v;
if (other.value == 0) {
throw JdbcException.get(SQLErrorCode.DIVISION_BY_ZERO_1, getSQL());
}
return ValueLong.get(value / other.value);
}
public Value modulus(Value v) {
ValueLong other = (ValueLong) v;
if (other.value == 0) {
throw JdbcException.get(SQLErrorCode.DIVISION_BY_ZERO_1, getSQL());
}
return ValueLong.get(this.value % other.value);
}
public String getSQL() {
return getString();
}
public int getType() {
return Value.LONG;
}
public long getLong() {
return value;
}
protected int compareSecure(Value o) {
ValueLong v = (ValueLong) o;
return MathUtils.compareLong(value, v.value);
}
public String getString() {
return String.valueOf(value);
}
public long getPrecision() {
return PRECISION;
}
public int hashCode() {
return (int) (value ^ (value >> 32));
}
public Object getObject() {
return value;
}
public void set(PreparedStatement prep, int parameterIndex)
throws SQLException {
prep.setLong(parameterIndex, value);
}
/**
* Get or create a long value for the given long.
*
* @param i
* the long
* @return the value
*/
public static ValueLong get(long i) {
if (i >= 0 && i < STATIC_SIZE) {
return STATIC_CACHE[(int) i];
}
return new ValueLong(i);
}
public int getDisplaySize() {
return DISPLAY_SIZE;
}
public boolean equals(Object other) {
return other instanceof ValueLong && value == ((ValueLong) other).value;
}
protected int compareSecure(Value o, CompareMode mode) {
ValueLong v = (ValueLong) o;
return MathUtils.compareLong(value, v.value);
}
}