/
ToBooleanNullable.java
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/
ToBooleanNullable.java
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/**
*
* Copyright (c) 2006-2018, Speedment, Inc. All Rights Reserved.
*
* Licensed 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.speedment.runtime.compute;
import com.speedment.common.function.BooleanToDoubleFunction;
import com.speedment.common.function.BooleanUnaryOperator;
import com.speedment.common.function.ToBooleanFunction;
import com.speedment.runtime.compute.expression.Expression;
import com.speedment.runtime.compute.expression.ExpressionType;
import com.speedment.runtime.compute.internal.expression.ComposedUtil;
import com.speedment.runtime.compute.internal.expression.OrElseGetUtil;
import com.speedment.runtime.compute.internal.expression.OrElseThrowUtil;
import com.speedment.runtime.compute.internal.expression.OrElseUtil;
import com.speedment.runtime.compute.trait.HasCompare;
import com.speedment.runtime.compute.trait.HasCompose;
import com.speedment.runtime.compute.trait.HasHash;
import com.speedment.runtime.compute.trait.HasMapIfPresent;
import com.speedment.runtime.compute.trait.HasMapToDoubleIfPresent;
import com.speedment.runtime.compute.trait.ToNullable;
import java.util.function.Function;
/**
* Expression that given an entity returns a {@code boolean} value, or
* {@code null}. 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 Function
*
* @author Emil Forslund
* @since 3.1.0
*/
@FunctionalInterface
public interface ToBooleanNullable<T>
extends Expression<T>,
ToBooleanFunction<T>,
ToNullable<T, Boolean, ToBoolean<T>>,
HasMapToDoubleIfPresent<T, BooleanToDoubleFunction>,
HasMapIfPresent<T, BooleanUnaryOperator, ToBooleanNullable<T>>,
HasHash<T>,
HasCompare<T>,
HasCompose<T> {
/**
* Returns a typed {@code ToBooleanNullable<T>} using the provided
* {@code lambda}.
*
* @param <T> type to extract from
* @param lambda to convert
* @return a typed {@code ToBooleanNullable<T>} using the provided
* {@code lambda}
*
* @throws NullPointerException if the provided {@code lambda} is
* {@code null}
*/
static <T> ToBooleanNullable<T> of(Function<T, Boolean> lambda) {
if (lambda instanceof ToBooleanNullable) {
return (ToBooleanNullable<T>) lambda;
} else {
return lambda::apply;
}
}
@Override
default ExpressionType expressionType() {
return ExpressionType.BOOLEAN_NULLABLE;
}
@Override
default boolean applyAsBoolean(T object) throws NullPointerException {
return apply(object);
}
@Override
default ToBoolean<T> orThrow() throws NullPointerException {
return OrElseThrowUtil.booleanOrElseThrow(this);
}
@Override
default ToBoolean<T> orElseGet(ToBoolean<T> getter) {
return OrElseGetUtil.booleanOrElseGet(this, getter);
}
@Override
default ToBoolean<T> orElse(Boolean value) {
return OrElseUtil.booleanOrElse(this, value);
}
@Override
default ToDoubleNullable<T> mapToDoubleIfPresent(BooleanToDoubleFunction mapper) {
final ToBooleanNullable<T> delegate = this;
return new ToDoubleNullable<T>() {
@Override
public Double apply(T object) {
return delegate.isNull(object) ? null
: mapper.applyAsDouble(delegate.applyAsBoolean(object));
}
@Override
public double applyAsDouble(T object) throws NullPointerException {
return mapper.applyAsDouble(delegate.applyAsBoolean(object));
}
@Override
public ToDouble<T> orElseGet(ToDouble<T> getter) {
return object -> delegate.isNull(object)
? getter.applyAsDouble(object)
: mapper.applyAsDouble(delegate.applyAsBoolean(object));
}
@Override
public ToDouble<T> orElse(Double value) {
return object -> delegate.isNull(object)
? value
: mapper.applyAsDouble(delegate.applyAsBoolean(object));
}
@Override
public boolean isNull(T object) {
return delegate.isNull(object);
}
@Override
public boolean isNotNull(T object) {
return delegate.isNotNull(object);
}
};
}
@Override
default ToBooleanNullable<T> mapIfPresent(BooleanUnaryOperator mapper) {
final ToBooleanNullable<T> delegate = this;
return new ToBooleanNullable<T>() {
@Override
public Boolean apply(T object) {
return delegate.isNull(object) ? null
: mapper.applyAsBoolean(delegate.applyAsBoolean(object));
}
@Override
public boolean applyAsBoolean(T object) throws NullPointerException {
return mapper.applyAsBoolean(delegate.applyAsBoolean(object));
}
@Override
public ToBoolean<T> orElseGet(ToBoolean<T> getter) {
return object -> delegate.isNull(object)
? getter.applyAsBoolean(object)
: mapper.applyAsBoolean(delegate.applyAsBoolean(object));
}
@Override
public ToBoolean<T> orElse(Boolean value) {
return object -> delegate.isNull(object)
? value
: mapper.applyAsBoolean(delegate.applyAsBoolean(object));
}
@Override
public boolean isNull(T object) {
return delegate.isNull(object);
}
@Override
public boolean isNotNull(T object) {
return delegate.isNotNull(object);
}
};
}
@Override
default long hash(T object) {
return isNull(object) ? 0 : (applyAsBoolean(object) ? 1 : 2);
}
@Override
default int compare(T first, T second) {
if (isNull(first)) {
return isNull(second) ? 0 : 1;
} else if (isNull(second)) {
return -1;
} else {
return Boolean.compare(
applyAsBoolean(first),
applyAsBoolean(second)
);
}
}
@Override
default <V> ToBooleanNullable<V> compose(Function<? super V, ? extends T> before) {
@SuppressWarnings("unchecked")
final Function<V, T> casted = (Function<V, T>) before;
return ComposedUtil.composeToBooleanNullable(casted, this);
}
}