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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.
/**
*
* 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.exception.SpeedmentFieldException;
import com.speedment.runtime.field.trait.HasComparableOperators;
import com.speedment.runtime.field.trait.HasFinder;
import java.util.function.Supplier;
import java.util.stream.Stream;
/**
*
* @param the source entity
* @param the target entity
* @param the column type
* @param the source field type
*
* @author Emil Forslund
* @since 3.0.0
*/
public class FindFromReference<
ENTITY,
FK_ENTITY,
V extends Comparable,
SOURCE extends Field & HasComparableOperators & HasFinder>
extends AbstractFindFrom> {
public FindFromReference(SOURCE source, HasComparableOperators target, TableIdentifier identifier, Supplier> streamSupplier) {
super(source, target, identifier, streamSupplier);
}
@Override
public FK_ENTITY apply(ENTITY entity) {
@SuppressWarnings("unchecked")
final V value = (V) getSourceField().getter().apply(entity);
if (value == null) {
return null;
} else {
return stream()
.filter(getTargetField().equal(value))
.findAny()
.orElseThrow(() -> new SpeedmentFieldException(
"Error! Could not find any entities in table '" +
getTableIdentifier() +
"' with '" + getTargetField().identifier().getColumnName() +
"' = '" + value + "'."
));
}
}
}
