/**
 * 
 */
package com.topsun.posclient.application;

import java.util.LinkedHashMap;
import java.util.Map;

import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.IExtension;
import org.eclipse.core.runtime.IExtensionPoint;
import org.eclipse.core.runtime.Platform;

public class ContributionItemCategorysRegistry {
	//private static final Logger logger = SystemLogFactory.getLogger(ContributionItemCategorysRegistry.class);

	public static final String EXTENSION_ID = "com.topsun.posclient.application.contributionItemCategorys";

	private static ContributionItemCategorysRegistry instance = null;

	public static ContributionItemCategorysRegistry getInstance() {
		if (instance == null) {
			synchronized (ContributionItemCategorysRegistry.class) {
				if (instance == null) {
					instance = new ContributionItemCategorysRegistry();
				}
			}
		}
		return instance;
	}

	public ContributionItemCategorysRegistry() {
		init();
	}

	private Map<String, ContributionItemCategoryDescriptor> descriptorMap = new LinkedHashMap<String, ContributionItemCategoryDescriptor>();

	private void init() {
		IExtensionPoint extensionPoint = Platform.getExtensionRegistry().getExtensionPoint(EXTENSION_ID);
		IExtension[] extensions = extensionPoint.getExtensions();
		for (IExtension extension : extensions) {
			IConfigurationElement[] elements = extension.getConfigurationElements();
			for (IConfigurationElement element : elements) {
				ContributionItemCategoryDescriptor descriptor = new ContributionItemCategoryDescriptor();
				try {
					descriptor.init(element);
					addDescriptor(descriptor);
				} catch (Throwable e) {
//					logger.error(e);
				}
			}
		}
	}

	public ContributionItemCategoryDescriptor[] getDescriptors() {
		return descriptorMap.values().toArray(new ContributionItemCategoryDescriptor[descriptorMap.size()]);
	}

	public boolean contains(String categoryId) {
		return descriptorMap.containsKey(categoryId);
	}

	public void addDescriptor(ContributionItemCategoryDescriptor descriptor) {
		if (descriptorMap.containsKey(descriptor.getId())) {
			throw new IllegalArgumentException("Duplicated category id '" + descriptor.getId() + "'.");
		}
		descriptorMap.put(descriptor.getId(), descriptor);
	}
}