/
ToDouble.java
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/
ToDouble.java
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package com.speedment.runtime.compute;
import com.speedment.runtime.compute.expression.Expression;
import com.speedment.runtime.compute.expression.ExpressionType;
import com.speedment.runtime.compute.expression.Expressions;
import com.speedment.runtime.compute.internal.ConstantDoubleImpl;
import com.speedment.runtime.compute.internal.expression.CastUtil;
import com.speedment.runtime.compute.internal.expression.ComposedUtil;
import com.speedment.runtime.compute.internal.expression.MapperUtil;
import com.speedment.runtime.compute.trait.*;
import static java.util.Objects.requireNonNull;
import java.util.function.DoubleUnaryOperator;
import java.util.function.Function;
import java.util.function.ToDoubleFunction;
/**
* Expression that given an entity returns a {@code double} value. This
* expression can be implemented using a lambda, or it can be a result of
* another operation. It has additional methods for operating on it.
*
* @param <T> type to extract from
*
* @see ToDoubleFunction
*
* @author Emil Forslund
* @since 3.1.0
*/
@FunctionalInterface
public interface ToDouble<T>
extends Expression<T>,
ToDoubleFunction<T>,
HasAsDouble<T>,
HasAsInt<T>,
HasAsLong<T>,
HasAbs<ToDouble<T>>,
HasSign<ToByte<T>>,
HasSqrt<ToDouble<T>>,
HasNegate<ToDouble<T>>,
HasPow<T>,
HasPlus<T, ToDouble<T>, ToDouble<T>, ToDouble<T>>,
HasMinus<T, ToDouble<T>, ToDouble<T>, ToDouble<T>>,
HasMultiply<T, ToDouble<T>, ToDouble<T>, ToDouble<T>>,
HasDivide<T>,
HasMap<T, DoubleUnaryOperator, ToDouble<T>>,
HasHash<T>,
HasCompare<T>,
HasCompose<T> {
/**
* Returns a typed {@code ToDouble<T>} using the provided {@code lambda}.
*
* @param <T> type to extract from
* @param lambda to convert
* @return a typed {@code ToDouble<T>} using the provided {@code lambda}
*
* @throws NullPointerException if the provided {@code lambda} is
* {@code null}
*/
static <T> ToDouble<T> of(ToDoubleFunction<T> lambda) {
if (lambda instanceof ToDouble) {
return (ToDouble<T>) lambda;
} else {
return lambda::applyAsDouble;
}
}
/**
* Returns an implementation of this interface that regardless of input,
* always returns the value specified.
*
* @param value the value to always return
* @param <T> the type of the ignored input
* @return the constant expression
*/
static <T> ToDouble<T> constant(double value) {
return new ConstantDoubleImpl<>(value);
}
@Override
double applyAsDouble(T object);
@Override
default ExpressionType expressionType() {
return ExpressionType.DOUBLE;
}
@Override
default ToDouble<T> asDouble() {
return this;
}
@Override
default ToInt<T> asInt() {
return CastUtil.castDoubleToInt(this);
}
@Override
default ToLong<T> asLong() {
return CastUtil.castDoubleToLong(this);
}
@Override
default ToDouble<T> map(DoubleUnaryOperator operator) {
return MapperUtil.mapDouble(this, operator);
}
@Override
default ToDouble<T> abs() {
return Expressions.abs(this);
}
@Override
default ToByte<T> sign() {
return Expressions.sign(this);
}
@Override
default ToDouble<T> sqrt() {
return Expressions.sqrt(this);
}
@Override
default ToDouble<T> negate() {
return Expressions.negate(this);
}
@Override
default ToDouble<T> pow(int power) {
return Expressions.pow(this, power);
}
@Override
default ToDouble<T> pow(double power) {
return Expressions.pow(this, power);
}
@Override
default ToDouble<T> pow(ToInt<T> power) {
return Expressions.pow(this, power);
}
@Override
default ToDouble<T> pow(ToDouble<T> power) {
return Expressions.pow(this, power);
}
@Override
default ToDouble<T> plus(byte other) {
return Expressions.plus(this, other);
}
@Override
default ToDouble<T> plus(ToByte<T> other) {
return Expressions.plus(this, other.asDouble());
}
@Override
default ToDouble<T> plus(int other) {
return Expressions.plus(this, other);
}
@Override
default ToDouble<T> plus(ToInt<T> other) {
return Expressions.plus(this, other);
}
@Override
default ToDouble<T> plus(long other) {
return Expressions.plus(this, other);
}
@Override
default ToDouble<T> plus(ToLong<T> other) {
return Expressions.plus(this, other);
}
@Override
default ToDouble<T> plus(double other) {
return Expressions.plus(this, other);
}
@Override
default ToDouble<T> plus(ToDouble<T> other) {
return Expressions.plus(this, other);
}
@Override
default ToDouble<T> minus(byte other) {
return Expressions.minus(this, other);
}
@Override
default ToDouble<T> minus(ToByte<T> other) {
return Expressions.minus(this, other.asDouble());
}
@Override
default ToDouble<T> minus(int other) {
return Expressions.minus(this, other);
}
@Override
default ToDouble<T> minus(ToInt<T> other) {
return Expressions.minus(this, other);
}
@Override
default ToDouble<T> minus(long other) {
return Expressions.minus(this, other);
}
@Override
default ToDouble<T> minus(ToLong<T> other) {
return Expressions.minus(this, other);
}
@Override
default ToDouble<T> minus(double other) {
return Expressions.minus(this, other);
}
@Override
default ToDouble<T> minus(ToDouble<T> other) {
return Expressions.minus(this, other);
}
@Override
default ToDouble<T> multiply(byte other) {
return Expressions.multiply(this, other);
}
@Override
default ToDouble<T> multiply(ToByte<T> other) {
return Expressions.multiply(this, other.asDouble());
}
@Override
default ToDouble<T> multiply(int other) {
return Expressions.multiply(this, other);
}
@Override
default ToDouble<T> multiply(ToInt<T> other) {
return Expressions.multiply(this, other);
}
@Override
default ToDouble<T> multiply(long other) {
return Expressions.multiply(this, other);
}
@Override
default ToDouble<T> multiply(ToLong<T> other) {
return Expressions.multiply(this, other);
}
@Override
default ToDouble<T> multiply(double other) {
return Expressions.multiply(this, other);
}
@Override
default ToDouble<T> multiply(ToDouble<T> other) {
return Expressions.multiply(this, other);
}
@Override
default ToDouble<T> divide(int divisor) {
return Expressions.divide(this, divisor);
}
@Override
default ToDouble<T> divide(ToInt<T> divisor) {
return Expressions.divide(this, divisor);
}
@Override
default ToDouble<T> divide(long divisor) {
return Expressions.divide(this, divisor);
}
@Override
default ToDouble<T> divide(ToLong<T> divisor) {
return Expressions.divide(this, divisor);
}
@Override
default ToDouble<T> divide(double divisor) {
return Expressions.divide(this, divisor);
}
@Override
default ToDouble<T> divide(ToDouble<T> divisor) {
return Expressions.divide(this, divisor);
}
@Override
default long hash(T object) {
final long l = Double.doubleToLongBits(applyAsDouble(object));
return (int) (l ^ (l >>> 32));
}
@Override
default int compare(T first, T second) {
return Double.compare(
applyAsDouble(first),
applyAsDouble(second)
);
}
@Override
default <V> ToDouble<V> compose(Function<? super V, ? extends T> before) {
@SuppressWarnings("unchecked")
final Function<V, T> casted = (Function<V, T>) before;
return ComposedUtil.composeToDouble(casted, this);
}
}