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Xodus is pure Java transactional schema-less embedded database

There is a newer version: 2.0.1

/**
 * Copyright 2010 - 2019 JetBrains s.r.o.
 *
 * 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 jetbrains.exodus.query.metadata;

import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

public interface ModelMetaData {

    @Nullable
    EntityMetaData getEntityMetaData(@NotNull String entityType);

    Iterable getEntitiesMetaData();

    AssociationMetaData addAssociation(String sourceEntityName, String targetEntityName,
                                       AssociationType type,
                                       String sourceName, AssociationEndCardinality sourceCardinality,
                                       boolean sourceCascadeDelete, boolean sourceClearOnDelete, boolean sourceTargetCascadeDelete, boolean sourceTargetClearOnDelete,
                                       String targetName, AssociationEndCardinality targetCardinality,
                                       boolean targetCascadeDelete, boolean targetClearOnDelete, boolean targetTargetCascadeDelete, boolean targetTargetClearOnDelete
    );

    AssociationMetaData removeAssociation(String entityName, String associationName);

}