com.arconsis.android.datarobot.EntityData Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of datarobot.api Show documentation

Datarobot for Android is a lightweight framework, which frees you from the burden of dealing with Androids SQLite database directly if you don't want to and let's you access it directly if you have to.

The newest version!

/*
 * Copyright (C) 2014 The Datarobot 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 com.arconsis.android.datarobot;

import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;

import com.arconsis.android.datarobot.entity.AutoIncrement;
import com.arconsis.android.datarobot.entity.Column;
import com.arconsis.android.datarobot.entity.PrimaryKey;

/**
 * @author Falk Appel
 * @author Alexander Frank
 */
final class EntityData {
	Field primaryKey;
	boolean autoIncrement;
	List columns = new ArrayList();
	List toManyAssociations = new ArrayList();
	List toOneAssociations = new ArrayList();
	List allAssociations = new ArrayList();
	Class type;

	private static final ConcurrentMap, EntityData> ENTITY_DATA_CACHE = new ConcurrentHashMap, EntityData>();

	static EntityData getEntityData(final Object entity) {
		return getEntityData(entity.getClass());
	}

	static EntityData getEntityData(final Class entityClass) {
		if (ENTITY_DATA_CACHE.containsKey(entityClass)) {
			return ENTITY_DATA_CACHE.get(entityClass);
		}
		EntityData entityData = new EntityData();
		entityData.type = entityClass;
		for (Field field : entityClass.getDeclaredFields()) {
			if (field.getAnnotation(Column.class) != null) {
				entityData.columns.add(field);
				if (field.getAnnotation(PrimaryKey.class) != null) {
					entityData.primaryKey = field;
					if (field.getAnnotation(AutoIncrement.class) != null) {
						entityData.autoIncrement = true;
					}
				}
			} else if (field.getAnnotation(com.arconsis.android.datarobot.entity.Relationship.class) != null) {
				if (Collection.class.equals(field.getType())) {
					entityData.toManyAssociations.add(field);
				} else {
					entityData.toOneAssociations.add(field);
				}
				entityData.allAssociations.add(field);
			}
		}
		if (entityData.primaryKey == null) {
			throw new IllegalStateException("No @PrimaryKey could be found for the @Entity " + entityClass.getCanonicalName());
		}
		ENTITY_DATA_CACHE.putIfAbsent(entityClass, entityData);
		return entityData;
	}

	@Override
	public String toString() {
		return "EntityData for " + type.getCanonicalName();
	}
}