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Eclipse JNoSQL mapping layer, Artemis, to Graph API
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/*
 *  Copyright (c) 2017 Otávio Santana and others
 *   All rights reserved. This program and the accompanying materials
 *   are made available under the terms of the Eclipse Public License v1.0
 *   and Apache License v2.0 which accompanies this distribution.
 *   The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
 *   and the Apache License v2.0 is available at http://www.opensource.org/licenses/apache2.0.php.
 *
 *   You may elect to redistribute this code under either of these licenses.
 *
 *   Contributors:
 *
 *   Otavio Santana
 */
package org.jnosql.artemis.graph.spi;

import org.apache.tinkerpop.gremlin.structure.Graph;
import org.jnosql.artemis.DatabaseQualifier;
import org.jnosql.artemis.DatabaseType;
import org.jnosql.artemis.graph.GraphTemplate;
import org.jnosql.artemis.graph.GraphTemplateProducer;

import javax.enterprise.context.ApplicationScoped;
import javax.enterprise.context.spi.CreationalContext;
import javax.enterprise.inject.spi.Bean;
import javax.enterprise.inject.spi.BeanManager;
import javax.enterprise.inject.spi.InjectionPoint;
import javax.enterprise.inject.spi.PassivationCapable;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import java.util.Collections;
import java.util.Set;

class GraphTemplateBean implements Bean, PassivationCapable {

    private final BeanManager beanManager;

    private final Set types;

    private final String provider;

    private final Set qualifiers;

    /**
     * Constructor
     *
     * @param beanManager the beanManager
     * @param provider    the provider name, that must be a
     */
    public GraphTemplateBean(BeanManager beanManager, String provider) {
        this.beanManager = beanManager;
        this.types = Collections.singleton(GraphTemplate.class);
        this.provider = provider;
        this.qualifiers = Collections.singleton(DatabaseQualifier.ofGraph(provider));
    }

    @Override
    public Class getBeanClass() {
        return GraphTemplate.class;
    }

    @Override
    public Set getInjectionPoints() {
        return Collections.emptySet();
    }

    @Override
    public boolean isNullable() {
        return false;
    }

    @Override
    public GraphTemplate create(CreationalContext creationalContext) {

        GraphTemplateProducer producer = getInstance(GraphTemplateProducer.class);
        Graph manager = getGraph();
        return producer.get(manager);
    }

    private Graph getGraph() {
        Bean bean = (Bean) beanManager.getBeans(Graph.class,
                DatabaseQualifier.ofGraph(provider) ).iterator().next();
        CreationalContext ctx = beanManager.createCreationalContext(bean);
        return (Graph) beanManager.getReference(bean, Graph.class, ctx);
    }


    private  T getInstance(Class clazz) {
        Bean bean = (Bean) beanManager.getBeans(clazz).iterator().next();
        CreationalContext ctx = beanManager.createCreationalContext(bean);
        return (T) beanManager.getReference(bean, clazz, ctx);
    }


    @Override
    public void destroy(GraphTemplate instance, CreationalContext creationalContext) {

    }

    @Override
    public Set getTypes() {
        return types;
    }

    @Override
    public Set getQualifiers() {
        return qualifiers;
    }

    @Override
    public Class getScope() {
        return ApplicationScoped.class;
    }

    @Override
    public String getName() {
        return null;
    }

    @Override
    public Set> getStereotypes() {
        return Collections.emptySet();
    }

    @Override
    public boolean isAlternative() {
        return false;
    }

    @Override
    public String getId() {
        return GraphTemplate.class.getName() + DatabaseType.COLUMN + "-" + provider;
    }

}