com.speedment.runtime.field.internal.collector.FieldCollectorImpl Maven / Gradle / Ivy
/**
*
* Copyright (c) 2006-2019, 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.field.internal.collector;
import com.speedment.runtime.field.Field;
import com.speedment.runtime.field.collector.FieldCollector;
import static java.util.Objects.requireNonNull;
import java.util.Set;
import java.util.function.BiConsumer;
import java.util.function.BinaryOperator;
import java.util.function.Function;
import java.util.function.Supplier;
import java.util.stream.Collector;
/**
*
* @param the entity type to be collected
* @param the intermediate accumulation type of the downstream collector
* @param the collected result
*
* @author Emil Forslund
* @since 3.0.2
*/
public final class FieldCollectorImpl
implements FieldCollector {
private final Field field;
private final Supplier supplier;
private final BiConsumer accumulator;
private final BinaryOperator combiner;
private final Function finisher;
private final Set characteristics;
public FieldCollectorImpl(
Field field,
Supplier supplier,
BiConsumer accumulator,
BinaryOperator combiner,
Function finisher,
Set characteristics) {
this.field = requireNonNull(field);
this.supplier = requireNonNull(supplier);
this.accumulator = requireNonNull(accumulator);
this.combiner = requireNonNull(combiner);
this.finisher = requireNonNull(finisher);
this.characteristics = requireNonNull(characteristics);
}
public FieldCollectorImpl(
Field field,
Supplier supplier,
BiConsumer accumulator,
BinaryOperator combiner,
Set characteristics) {
this(field, supplier, accumulator, combiner, castingIdentity(), characteristics);
}
@Override
public Field getField() {
return field;
}
@Override
public BiConsumer accumulator() {
return accumulator;
}
@Override
public Supplier supplier() {
return supplier;
}
@Override
public BinaryOperator combiner() {
return combiner;
}
@Override
public Function finisher() {
return finisher;
}
@Override
public Set characteristics() {
return characteristics;
}
@SuppressWarnings("unchecked")
private static Function castingIdentity() {
return i -> (R) i;
}
}