update/org.eclipse.update.core/src/org/eclipse/update/core/model/CategoryModel.java

package org.eclipse.update.core.model;
/*
 * (c) Copyright IBM Corp. 2000, 2002.
 * All Rights Reserved.
 */

import java.net.MalformedURLException;
import java.net.URL;
import java.util.Comparator;
import java.util.ResourceBundle;

/**
 * Feature category definition model object.
 * <p>
 * This class may be instantiated or subclassed by clients. However, in most 
 * cases clients should instead instantiate or subclass the provided 
 * concrete implementation of this model.
 * </p>
 * @see org.eclipse.update.core.Category
 * @since 2.0
 */

public class CategoryModel extends ModelObject {

	private String name;
	private String label;
	private String localizedLabel;
	private URLEntryModel description;
	private static Comparator comp;

	/**
	 * Creates an uninitialized model object.
	 * 
	 * @since 2.0
	 */
	public CategoryModel() {
		super();
	}

	/**
	 * Retrieve the name of the category.
	 * 
	 * @return category name, or <code>null</code>.
	 * @since 2.0
	 */
	public String getName() {
		return name;
	}

	/**
	 * Retrieve the displayable label for the category. If the model
	 * object has been resolved, the label is localized.
	 * 
	 * @return displayable label, or <code>null</code>.
	 * @since 2.0
	 */
	public String getLabel() {
		if (localizedLabel != null)
			return localizedLabel;
		else
			return label;
	}

	/**
	 * Retrieve the non-localized displayable label for the category.
	 * 
	 * @return non-localized displayable label, or <code>null</code>.
	 * @since 2.0
	 */
	public String getLabelNonLocalized() {
		return label;
	}

	/**
	 * Retrieve the detailed category description
	 * 
	 * @return category description, or <code>null</code>.
	 * @since 2.0
	 */
	public URLEntryModel getDescriptionModel() {
		return description;
	}

	/**
	 * Sets the category displayable label.
	 * Throws a runtime exception if this object is marked read-only.
	 * 
	 * @param label displayable label, or resource key
	 * @since 2.0
	 */
	public void setLabel(String label) {
		assertIsWriteable();
		this.label = label;
		this.localizedLabel = null;
	}

	/**
	 * Sets the category name.
	 * Throws a runtime exception if this object is marked read-only.
	 * 
	 * @param name category name
	 * @since 2.0
	 */
	public void setName(String name) {
		assertIsWriteable();
		this.name = name;
	}

	/**
	 * Sets the category description.
	 * Throws a runtime exception if this object is marked read-only.
	 * 
	 * @param description category description
	 * @since 2.0
	 */
	public void setDescriptionModel(URLEntryModel description) {
		assertIsWriteable();
		this.description = description;
	}

	/**
	 * Marks the model object as read-only.
	 * 
	 * @since 2.0
	 */
	public void markReadOnly() {
		super.markReadOnly();
		markReferenceReadOnly(getDescriptionModel());
	}

	/**
	 * Resolve the model object.
	 * Any URL strings in the model are resolved relative to the 
	 * base URL argument. Any translatable strings in the model that are
	 * specified as translation keys are localized using the supplied 
	 * resource bundle.
	 * 
	 * @param base URL
	 * @param bundle resource bundle
	 * @exception MalformedURLException
	 * @since 2.0
	 */
	public void resolve(URL base, ResourceBundle bundle)
		throws MalformedURLException {
		// resolve local elements
		localizedLabel = resolveNLString(bundle, label);

		// delegate to references
		resolveReference(getDescriptionModel(), base, bundle);
	}

	/**
	 * Compare two category models for equality.
	 * 
	 * @see Object#equals(Object)
	 * @since 2.0
	 */
	public boolean equals(Object obj) {
		boolean result = false;
		if (obj instanceof CategoryModel) {
			CategoryModel otherCategory = (CategoryModel) obj;
			result = getName().equalsIgnoreCase(otherCategory.getName());
		}
		return result;
	}

	/**
	 * Compute hash code for category model.
	 * 
	 * @see Object#hashCode()
	 * @since 2.0
	 */
	public int hashCode() {
		return getName().hashCode();
	}

	/**
	 * Returns a comparator for category models.
	 * 
	 * @return comparator
	 * @since 2.0
	 */
	public static Comparator getComparator() {
		if (comp == null) {
			comp = new Comparator() {
				/*
				 * @see Comparator#compare(Object,Object)
				 * Returns 0 if versions are equal.
				 * Returns -1 if object1 is after than object2.
				 * Returns +1 if object1 is before than object2.
				 */
				public int compare(Object o1, Object o2) {

					CategoryModel cat1 = (CategoryModel) o1;
					CategoryModel cat2 = (CategoryModel) o2;

					if (cat1.equals(cat2))
						return 0;
					return cat1.getName().compareTo(cat2.getName());
				}
			};
		}
		return comp;
	}
}