/*******************************************************************************
 * Copyright (c) 2008 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.wst.sse.ui.internal.correction;

import java.util.ArrayList;

import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.IExtensionRegistry;
import org.eclipse.core.runtime.Platform;
import org.eclipse.wst.sse.ui.internal.SSEUIPlugin;
import org.eclipse.wst.sse.ui.internal.extension.RegistryReader;

public class QuickFixRegistryReader extends RegistryReader {
	private static final String QUICKFIXPROCESSOR = "quickFixProcessor"; //$NON-NLS-1$
	private static final String ATT_PROBLEMTYPE = "problemType"; //$NON-NLS-1$

	private static final String ATTRIBUTE = "attribute"; //$NON-NLS-1$
	private static final String ATT_NAME = "name"; //$NON-NLS-1$
	private static final String ATT_VALUE = "value"; //$NON-NLS-1$

	private ArrayList currentAttributeNames;

	private ArrayList currentAttributeValues;

	private QuickFixRegistry quickFixProcessorRegistry;

	protected boolean readElement(IConfigurationElement element) {
		if (element.getName().equals(QUICKFIXPROCESSOR)) {
			readQuickFixProcessorElement(element);
			return true;
		}
		if (element.getName().equals(ATTRIBUTE)) {
			readAttributeElement(element);
			return true;
		}
		return false;
	}

	/**
	 * Processes a resolution configuration element.
	 */
	private void readQuickFixProcessorElement(IConfigurationElement element) {
		// read type
		String type = element.getAttribute(ATT_PROBLEMTYPE);

		// read attributes and values
		currentAttributeNames = new ArrayList();
		currentAttributeValues = new ArrayList();
		readElementChildren(element);
		String[] attributeNames = (String[]) currentAttributeNames.toArray(new String[currentAttributeNames.size()]);
		String[] attributeValues = (String[]) currentAttributeValues.toArray(new String[currentAttributeValues.size()]);

		// add query to the registry
		AnnotationQuery query = new AnnotationQuery(type, attributeNames);
		AnnotationQueryResult result = new AnnotationQueryResult(attributeValues);
		quickFixProcessorRegistry.addResolutionQuery(query, result, element);
	}

	/**
	 * Get the marker help that is defined in the plugin registry and add it
	 * to the given marker help registry.
	 * <p>
	 * Warning: The marker help registry must be passed in because this method
	 * is called during the process of setting up the marker help registry and
	 * at this time it has not been safely setup with the plugin.
	 * </p>
	 */
	public void addHelp(QuickFixRegistry registry) {
		IExtensionRegistry extensionRegistry = Platform.getExtensionRegistry();
		quickFixProcessorRegistry = registry;
		readRegistry(extensionRegistry, SSEUIPlugin.ID, QUICKFIXPROCESSOR);
	}

	/**
	 * Processes an attribute sub element.
	 */
	private void readAttributeElement(IConfigurationElement element) {
		String name = element.getAttribute(ATT_NAME);
		String value = element.getAttribute(ATT_VALUE);
		if (name != null && value != null) {
			currentAttributeNames.add(name);
			currentAttributeValues.add(value);
		}
	}
}