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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.ReferenceField;
import com.speedment.runtime.field.method.FindFromNullable;
import com.speedment.runtime.field.trait.HasComparableOperators;
import com.speedment.runtime.field.trait.HasReferenceOperators;
import com.speedment.runtime.field.trait.HasReferenceValue;

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

import static java.lang.String.format;

/**
 * Default implementation of {@link FindFromNullable} for
 * {@link ReferenceField ReferenceFields}.
 *
 * @author Emil Forslund
 * @since  3.0.11
 */
public final class FindFromNullableReference<
    ENTITY, FK_ENTITY,
    V extends Comparable,
    SOURCE extends Field
                 & HasReferenceOperators
                 & HasReferenceValue,
    TARGET extends Field
                 & HasComparableOperators
> extends AbstractFindFromNullable
implements FindFromNullable {

    public FindFromNullableReference(
            SOURCE source,
            TARGET target,
            TableIdentifier foreignTable,
            Supplier> streamSupplier) {

        super(source, target, foreignTable, streamSupplier);
    }

    @Override
    public boolean isPresent(ENTITY entity) {
        return getSourceField().isNotNull().test(entity);
    }

    @Override
    public FK_ENTITY applyOrThrow(ENTITY entity)
            throws IllegalArgumentException {

        return apply(entity).findAny()
            .orElseThrow(() -> new IllegalArgumentException(format(
                "Specified entity '%s' does not reference any %s.",
                entity, getTableIdentifier()
            )));
    }

    @Override
    public Stream apply(ENTITY entity) {
        return stream().filter(
            getTargetField().equal(getSourceField().get(entity))
        );
    }
}