package com.trendmicro.grid.acl.ds.trivial;
   
   import com.trendmicro.grid.acl.ds.CategoryRepository;
   import com.trendmicro.grid.acl.l0.datatypes.Category;
   import com.trendmicro.grid.acl.l0.datatypes.CategoryView;
   
   import javax.xml.bind.annotation.*;
   import java.util.ArrayList;
   import java.util.List;
  import java.util.Locale;
  
  /**
   * Implements a persistable data structure that is capable of defining category views.
   *
   * @author juergen_kellerer, 2010-05-06
   * @version 1.0
   */
  @XmlType(namespace = I18NAwareDefinition.NS)
  @XmlAccessorType(XmlAccessType.FIELD)
  @XmlRootElement(name = "category-view-definition", namespace = I18NAwareDefinition.NS)
  public class CategoryViewDefinition extends I18NAwareDefinition {
  
  	private static final Category[] EMPTY_CHILDREN = new Category[0];
  
  	@XmlAttribute
  	String name;
  
  	@XmlElement(name = "category")
  	private List<CategoryViewDefinition> children = new ArrayList<CategoryViewDefinition>();
  
  	/**
  	 * Constructs an empty category view definition (used by JAXB only).
  	 */
  	public CategoryViewDefinition() {
  	}
  
  	/**
  	 * Constructs a display name.
  	 *
  	 * @param name			 The unique name of the view.
  	 * @param availableLocales the locales that his view should be made available in.
  	 */
  	public CategoryViewDefinition(String name, List<Locale> availableLocales) {
  		super(availableLocales);
  		this.name = name;
  	}
  
  	public String getName() {
  		return name;
  	}
  
  	public List<CategoryViewDefinition> getChildren() {
  		return children;
  	}
  
  	/**
  	 * Converts this definition to a localized category view.
  	 *
  	 * @param locale			 the locale to use for L10N and I18N.
  	 * @param categoryRepository the implementation delivering the categories.
  	 * @return a localized category view.
  	 */
  	public CategoryView toCategoryView(Locale locale, CategoryRepository categoryRepository) {
  		try {
  			return new CategoryView(name, createChildCategories(locale, categoryRepository));
  		} catch (IllegalStateException e) {
  			throw new IllegalStateException("Failed assembling the category view '" + name + "'", e);
  		}
  	}
  
  	private Category toCategoryTree(Locale locale, CategoryRepository categoryRepository) {
  		Category c = categoryRepository.getPlainCategory(locale, name);
  		if (c == null) {
  			throw new IllegalStateException(
  				"Failed to retrieve category '" + name + "' from the given category repository.");
  		}
  		c.setChildCategories(createChildCategories(locale, categoryRepository));
  		return c;
  	}
  
  	private Category[] createChildCategories(Locale locale, CategoryRepository categoryRepository) {
  		if (!children.isEmpty()) {
  			List<Category> childCategories = new ArrayList<Category>(children.size());
  			for (CategoryViewDefinition definition : children) {
  				if (definition.isAvailableInLocale(locale))
  					childCategories.add(definition.toCategoryTree(locale, categoryRepository));
  			}
  			return childCategories.toArray(new Category[childCategories.size()]);
  		}
  		return EMPTY_CHILDREN;
  	}
  }