DynamoDBPersistentEntityImpl.java

/*
 * Copyright 2013 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.socialsignin.spring.data.dynamodb.mapping;

import java.util.Comparator;

import org.springframework.data.mapping.model.BasicPersistentEntity;
import org.springframework.data.mapping.model.MappingException;
import org.springframework.data.util.TypeInformation;

/**
 * DynamoDB specific {@link DynamoDBPersistentEntity} implementation
 * 
 * @author Michael Lavelle
 */
public class DynamoDBPersistentEntityImpl<T> extends BasicPersistentEntity<T, DynamoDBPersistentProperty> implements
		DynamoDBPersistentEntity<T> {
	public DynamoDBPersistentEntityImpl(TypeInformation<T> information, Comparator<DynamoDBPersistentProperty> comparator) {
		super(information, comparator);
	}

	/**
	 * Returns the given property if it is a better candidate for the id
	 * property than the current id property.
	 * 
	 * @param property
	 *            the new id property candidate, will never be {@literal null}.
	 * @return the given id property or {@literal null} if the given property is
	 *         not an id property.
	 */
	protected DynamoDBPersistentProperty returnPropertyIfBetterIdPropertyCandidateOrNull(DynamoDBPersistentProperty property) {

		if (!property.isIdProperty()) {
			return null;
		}

		if (getIdProperty() != null) {

			if (getIdProperty().isCompositeIdProperty() && property.isHashKeyProperty()) {
				// Do nothing - favour id annotated properties over hashkey
				return null;
			} else if (getIdProperty().isHashKeyProperty() && property.isCompositeIdProperty()) {
				return property;
			} else {
				throw new MappingException(String.format("Attempt to add id property %s but already have property %s registered "
						+ "as id. Check your mapping configuration!", property.getField(), getIdProperty().getField()));
			}
		}

		return property;
	}

}