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10 shop2020 1 
/**
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 *
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 */
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package in.shop2020.metamodel.definitions;
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/**
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 * Singleton Catalog instance. Provides single point access to all entities and
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 * definitions in shop2020 content model
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 *
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 * @author naveen
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 *
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 */
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public class Catalog {
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	private static final Catalog catalog = new Catalog();
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	/**
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	 * Reference to root of shop2020 category tree
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	 */
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	private Category rootCategory;
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	/**
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	 * Reference to aggregator of all definition objects
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	 */
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	private DefinitionsContainer defsContainer;
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	/**
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	 * Reference to aggregator of all core objects
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	 */
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	private EntityContainer entContainer;
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	/**
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	 * A private Constructor prevents any other class from instantiating
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	 */
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	private Catalog() {
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	}
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	/**
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	 *
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	 * @return 	Catalog 	single instance of Catalog
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	 */
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	public static final Catalog getInstance() {
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		return catalog;
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	}
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	/**
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	 *
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	 * @return rootCategory Root Category
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	 * @throws Exception
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	 */
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	public Category getRootCategory() throws Exception {
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		// lazily de-serialize from disk
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		if(this.rootCategory == null) {
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			DefinitionsContainer defs = this.getDefinitionsContainer();
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			this.rootCategory = defs.getCategory(10000);
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		}
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		return this.rootCategory;
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	}
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	/**
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	 *
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	 * @return defsContainer Definitions Container
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	 */
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	public DefinitionsContainer getDefinitionsContainer() {
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		if(this.defsContainer == null) {
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			this.defsContainer = new DefinitionsContainer();
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		}
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		return this.defsContainer;
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	}
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	/**
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	 *
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	 * @return EntityContainer Core object's container
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	 */
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	public EntityContainer getEntityContainer() {
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		if(this.entContainer == null) {
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			this.entContainer = new EntityContainer();
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		}
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		return this.entContainer;
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	}
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}