MappingCassandraEntityInformation.java

/*
 * Copyright 2013-2017 the original author or authors
 *
 * 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 org.springframework.data.cassandra.repository.support;

import java.util.Optional;
import java.util.concurrent.atomic.AtomicReference;

import org.springframework.cassandra.core.cql.CqlIdentifier;
import org.springframework.data.cassandra.convert.CassandraConverter;
import org.springframework.data.cassandra.mapping.CassandraPersistentEntity;
import org.springframework.data.cassandra.mapping.CassandraPersistentProperty;
import org.springframework.data.cassandra.repository.MapId;
import org.springframework.data.cassandra.repository.query.CassandraEntityInformation;
import org.springframework.data.mapping.PropertyHandler;
import org.springframework.data.repository.core.support.AbstractEntityInformation;
import org.springframework.util.Assert;

/**
 * {@link CassandraEntityInformation} implementation using a {@link CassandraPersistentEntity} instance to lookup the
 * necessary information.
 *
 * @author Alex Shvid
 * @author Matthew T. Adams
 * @author Mark Paluch
 */
public class MappingCassandraEntityInformation<T, ID> extends AbstractEntityInformation<T, ID>
		implements CassandraEntityInformation<T, ID> {

	private final CassandraPersistentEntity<T> entityMetadata;
	private final CassandraConverter converter;
	private final boolean isPrimaryKeyEntity;

	/**
	 * Create a new {@link MappingCassandraEntityInformation} for the given {@link CassandraPersistentEntity}.
	 *
	 * @param entity must not be {@literal null}.
	 */
	public MappingCassandraEntityInformation(CassandraPersistentEntity<T> entity, CassandraConverter converter) {

		super(entity.getType());

		this.entityMetadata = entity;
		this.converter = converter;
		this.isPrimaryKeyEntity = hasNonIdProperties(entity);
	}

	/* (non-Javadoc)
	 * @see org.springframework.data.repository.core.EntityInformation#getId(java.lang.Object)
	 */
	@SuppressWarnings("unchecked")
	@Override
	public Optional<ID> getId(T entity) {

		Assert.notNull(entity, "Entity must not be null");

		Optional<CassandraPersistentProperty> idProperty = entityMetadata.getIdProperty();

		// FIXME: Cast
		return idProperty.map(p -> entityMetadata.getIdentifierAccessor(entity).getIdentifier())
				.orElseGet(() -> Optional.ofNullable(converter.getId(entity, entityMetadata))).map(o -> (ID) o);
	}

	/* (non-Javadoc)
	 * @see org.springframework.data.repository.core.EntityInformation#getIdType()
	 */
	@SuppressWarnings("unchecked")
	@Override
	public Class<ID> getIdType() {
		return entityMetadata.getIdProperty().map(p -> (Class<ID>) p.getType()).orElse((Class<ID>) MapId.class);
	}

	/* (non-Javadoc)
	 * @see org.springframework.data.cassandra.repository.query.CassandraEntityMetadata#getTableName()
	 */
	@Override
	public CqlIdentifier getTableName() {
		return entityMetadata.getTableName();
	}

	@Override
	public boolean isPrimaryKeyEntity() {
		return isPrimaryKeyEntity;
	}

	private static boolean hasNonIdProperties(CassandraPersistentEntity<?> entity) {

		final AtomicReference<Boolean> hasPrimaryKeyOnlyProperties = new AtomicReference<Boolean>(true);

		entity.doWithProperties(new PropertyHandler<CassandraPersistentProperty>() {
			@Override
			public void doWithPersistentProperty(CassandraPersistentProperty property) {

				if (property.isCompositePrimaryKey() || property.isPrimaryKeyColumn() || property.isIdProperty()) {
					return;
				}

				hasPrimaryKeyOnlyProperties.set(false);
			}
		});

		return hasPrimaryKeyOnlyProperties.get();
	}
}