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/*
 * Copyright 2013-2019 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.config;

import org.springframework.beans.factory.FactoryBean;
import org.springframework.beans.factory.InitializingBean;
import org.springframework.data.cassandra.core.cql.CqlTemplate;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;

import com.datastax.driver.core.Session;

/**
 * Factory for configuring a {@link CqlTemplate}.
 *
 * @author Matthew T. Adams
 * @author Mark Paluch
 */
public class CassandraCqlTemplateFactoryBean implements FactoryBean, InitializingBean {

	private @Nullable CqlTemplate template;

	private @Nullable Session session;

	/* (non-Javadoc)
	 * @see org.springframework.beans.factory.FactoryBean#getObject()
	 */
	@Override
	public CqlTemplate getObject() {
		return template;
	}

	/* (non-Javadoc)
	 * @see org.springframework.beans.factory.FactoryBean#getObjectType()
	 */
	@Override
	public Class getObjectType() {
		return CqlTemplate.class;
	}

	/* (non-Javadoc)
	 * @see org.springframework.beans.factory.FactoryBean#isSingleton()
	 */
	@Override
	public boolean isSingleton() {
		return true;
	}

	/* (non-Javadoc)
	 * @see org.springframework.beans.factory.InitializingBean#afterPropertiesSet()
	 */
	@Override
	public void afterPropertiesSet() throws Exception {

		Assert.notNull(session, "Session must not be null");

		this.template = new CqlTemplate(session);
	}

	/**
	 * Sets the Cassandra {@link Session} to use. The {@link CqlTemplate} will use the logged keyspace of the underlying
	 * {@link Session}. Don't change the keyspace using CQL but use multiple {@link Session} and {@link CqlTemplate}
	 * beans.
	 *
	 * @param session must not be {@literal null}.
	 */
	public void setSession(Session session) {

		Assert.notNull(session, "Session must not be null");

		this.session = session;
	}
}