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Silk Java dependency injection framework
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/*
 *  Copyright (c) 2012, Jan Bernitt 
 *			
 *  Licensed under the Apache License, Version 2.0, http://www.apache.org/licenses/LICENSE-2.0
 */
package se.jbee.inject.util;

import static se.jbee.inject.Demand.demand;
import static se.jbee.inject.Dependency.dependency;

import java.util.Arrays;

import se.jbee.inject.Demand;
import se.jbee.inject.Dependency;
import se.jbee.inject.Expiry;
import se.jbee.inject.Injectable;
import se.jbee.inject.Injector;
import se.jbee.inject.Injectron;
import se.jbee.inject.Precision;
import se.jbee.inject.Repository;
import se.jbee.inject.Resource;
import se.jbee.inject.Resourcing;
import se.jbee.inject.Source;
import se.jbee.inject.Supplier;

/**
 * Describing data of something that can be supplied.
 * 
 * It describes WHAT is supplied, HOW to supply it and how stable it is and WHERE it came from.
 * 
 * @author Jan Bernitt ([email protected])
 */
public final class Suppliable
		implements Resourcing {

	public static InjectronSource source( Suppliable[] suppliables ) {
		return new SuppliableSource( suppliables );
	}

	public final Resource resource;
	public final Supplier supplier;
	public final Repository repository;
	public final Source source;
	public final Expiry expiry;

	public Suppliable( Resource resource, Supplier supplier, Repository repository,
			Expiry expiry, Source source ) {
		super();
		this.resource = resource;
		this.supplier = supplier;
		this.repository = repository;
		this.expiry = expiry;
		this.source = source;
	}

	@Override
	public String toString() {
		return source + " / " + resource + " / " + supplier;
	}

	@Override
	public Resource getResource() {
		return resource;
	}

	/**
	 * A {@link InjectronSource} that creates {@link Injectron}s from {@link Suppliable}s.
	 * 
	 * @author Jan Bernitt ([email protected])
	 */
	private static class SuppliableSource
			implements InjectronSource {

		private final Suppliable[] suppliables;

		SuppliableSource( Suppliable[] suppliables ) {
			super();
			this.suppliables = suppliables;
		}

		@Override
		public Injectron[] exportTo( Injector injector ) {
			return injectrons( suppliables, injector );
		}

		public static Injectron[] injectrons( Suppliable[] suppliables, Injector injector ) {
			final int total = suppliables.length;
			if ( total == 0 ) {
				return new Injectron[0];
			}
			Arrays.sort( suppliables, Precision.RESOURCE_COMPARATOR );
			Injectron[] res = new Injectron[total];
			for ( int i = 0; i < total; i++ ) {
				res[i] = injectron( suppliables[i], injector, total, i );
			}
			return res;
		}

		private static  Injectron injectron( Suppliable s, Injector injector,
				int cardinality, int serialNumber ) {
			Resource resource = s.resource;
			Dependency dependency = dependency( resource.getInstance() );
			Demand demand = demand( resource, dependency, serialNumber, cardinality );
			Injectable injectable = Inject.asInjectable( s.supplier, injector );
			return Inject.injectron( injectable, resource, demand, s.expiry, s.repository, s.source );
		}

	}
}