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A Speedment bundle that shades all dependencies into one jar. This is useful when deploying an application on a server.
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/*
 *
 * 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;
    }
}