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Partly generated model of the fields that represent columns in the database. Fields can be used to produce special predicates and functions that contain metadata that Speedment can analyze runtime.

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/**
 *
 * Copyright (c) 2006-2017, 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.method;

import com.speedment.runtime.config.identifier.TableIdentifier;
import com.speedment.runtime.field.Field;
import com.speedment.runtime.field.method.FindFrom;
import com.speedment.runtime.field.trait.HasComparableOperators;
import com.speedment.runtime.field.trait.HasFinder;

import java.util.function.Supplier;
import java.util.stream.Stream;

import static java.util.Objects.requireNonNull;

/**
 *
 * @param      the source entity
 * @param   the target entity
 * @param           the wrapper type
 * 
 * @author  Emil Forslund
 * @since   3.0.0
 */
abstract class AbstractFindFrom<
    ENTITY,
    FK_ENTITY,
    V extends Comparable,
    SOURCE extends Field & HasComparableOperators & HasFinder,
    TARGET extends Field & HasComparableOperators
> implements FindFrom {
    
    private final SOURCE source;
    private final TARGET target;
    private final TableIdentifier identifier;
    private final Supplier> streamSupplier;

    AbstractFindFrom(
        SOURCE source,
        TARGET target,
        TableIdentifier identifier,
        Supplier> streamSupplier) {
        
        this.source         = requireNonNull(source);
        this.target         = requireNonNull(target);
        this.identifier     = requireNonNull(identifier);
        this.streamSupplier = requireNonNull(streamSupplier);
    }

    @Override
    public final SOURCE getSourceField() {
        return source;
    }

    @Override
    public final TARGET getTargetField() {
        return target;
    }

    @Override
    public final TableIdentifier getTableIdentifier() {
        return identifier;
    }
    
    protected final Stream stream() {
        return streamSupplier.get();
    }
}