85 lines
2.0 KiB
Java
85 lines
2.0 KiB
Java
package expression;
|
|
|
|
import java.math.BigDecimal;
|
|
import java.math.BigInteger;
|
|
import java.util.List;
|
|
|
|
/**
|
|
* @author Doschennikov Nikita (me@fymio.us)
|
|
*/
|
|
public class Reverse extends AbstractExpression {
|
|
|
|
private final AbstractExpression operand;
|
|
|
|
public Reverse(AbstractExpression operand) {
|
|
this.operand = operand;
|
|
}
|
|
|
|
private static int reverseInt(int n) {
|
|
boolean negative = n < 0;
|
|
long abs = Math.abs((long) n);
|
|
long reversed = 0;
|
|
while (abs > 0) {
|
|
reversed = reversed * 10 + (abs % 10);
|
|
abs /= 10;
|
|
}
|
|
long result = negative ? -reversed : reversed;
|
|
return (int) result;
|
|
}
|
|
|
|
@Override
|
|
public int evaluate(int x) {
|
|
return reverseInt(operand.evaluate(x));
|
|
}
|
|
|
|
@Override
|
|
public int evaluate(int x, int y, int z) {
|
|
return reverseInt(operand.evaluate(x, y, z));
|
|
}
|
|
|
|
@Override
|
|
public int evaluate(List<Integer> vars) {
|
|
return reverseInt(operand.evaluate(vars));
|
|
}
|
|
|
|
@Override
|
|
public BigInteger evaluateBi(List<BigInteger> vars) {
|
|
throw new UnsupportedOperationException(
|
|
"reverse not supported for BigInteger"
|
|
);
|
|
}
|
|
|
|
@Override
|
|
public BigDecimal evaluateBd(List<BigDecimal> vars) {
|
|
throw new UnsupportedOperationException(
|
|
"reverse not supported for BigDecimal"
|
|
);
|
|
}
|
|
|
|
@Override
|
|
public String toString() {
|
|
return "reverse(" + operand + ")";
|
|
}
|
|
|
|
@Override
|
|
public String toMiniString() {
|
|
if (operand instanceof AbstractBinaryOperation) {
|
|
return "reverse(" + operand.toMiniString() + ")";
|
|
}
|
|
|
|
return "reverse " + operand.toMiniString();
|
|
}
|
|
|
|
@Override
|
|
public boolean equals(Object obj) {
|
|
if (this == obj) return true;
|
|
if (!(obj instanceof Reverse)) return false;
|
|
return operand.equals(((Reverse) obj).operand);
|
|
}
|
|
|
|
@Override
|
|
public int hashCode() {
|
|
return operand.hashCode() ^ 0x52455645;
|
|
}
|
|
}
|