core/plugins/org.eclipse.dltk.core/model/org/eclipse/dltk/core/DLTKLanguageManager.java

/*******************************************************************************
 * Copyright (c) 2005, 2007 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
 *
 
 *******************************************************************************/
package org.eclipse.dltk.core;

import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.Status;
import org.eclipse.core.runtime.SubProgressMonitor;
import org.eclipse.dltk.ast.declarations.ISourceParser;
import org.eclipse.dltk.codeassist.ICompletionEngine;
import org.eclipse.dltk.codeassist.ISelectionEngine;
import org.eclipse.dltk.compiler.problem.DefaultProblemFactory;
import org.eclipse.dltk.compiler.problem.IProblemFactory;
import org.eclipse.dltk.core.search.DLTKSearchParticipant;
import org.eclipse.dltk.core.search.IDLTKSearchScope;
import org.eclipse.dltk.core.search.IMatchLocatorParser;
import org.eclipse.dltk.core.search.SearchPattern;
import org.eclipse.dltk.core.search.SearchRequestor;
import org.eclipse.dltk.core.search.indexing.SourceIndexerRequestor;
import org.eclipse.dltk.core.search.matching.MatchLocator;
import org.eclipse.dltk.internal.core.ClassBasedDLTKExtensionManager;
import org.eclipse.dltk.internal.core.NewInstanceClassBasedDLTKExtensionManager;
import org.eclipse.dltk.internal.core.BasicDLTKExtensionManager.ElementInfo;

public class DLTKLanguageManager  {
	private final static String LANGUAGE_EXTPOINT = DLTKCore.PLUGIN_ID + ".language";
	private final static String SOURCE_ELEMENT_PARSERS_EXTPOINT = DLTKCore.PLUGIN_ID + ".sourceElementParsers";
	private final static String SOURCE_PARSERS_EXTPOINT = DLTKCore.PLUGIN_ID + ".sourceParsers";
	private final static String PROBLEM_FACTORY_EXTPOINT = DLTKCore.PLUGIN_ID + ".problemFactory";
	private final static String COMPLETION_ENGINE_EXTPOINT = DLTKCore.PLUGIN_ID + ".completionEngine";
	private final static String SELECTION_ENGINE_EXTPOINT = DLTKCore.PLUGIN_ID + ".selectionEngine";
	private final static String SEARCH_EXTPOINT = DLTKCore.PLUGIN_ID + ".search";
	private final static String CALLHIERARCHY_EXTPOINT = DLTKCore.PLUGIN_ID + ".callHierarchy";

	private static ClassBasedDLTKExtensionManager instance = new ClassBasedDLTKExtensionManager(LANGUAGE_EXTPOINT);
	
	// Inner managers
	private static ClassBasedDLTKExtensionManager sourceElementParsersManager = new NewInstanceClassBasedDLTKExtensionManager(SOURCE_ELEMENT_PARSERS_EXTPOINT);
	private static ClassBasedDLTKExtensionManager problemFactoryManager = new ClassBasedDLTKExtensionManager(PROBLEM_FACTORY_EXTPOINT);
	
	private static ClassBasedDLTKExtensionManager selectionEngineManager = new NewInstanceClassBasedDLTKExtensionManager(SELECTION_ENGINE_EXTPOINT);
	private static ClassBasedDLTKExtensionManager completionEngineManager = new NewInstanceClassBasedDLTKExtensionManager(COMPLETION_ENGINE_EXTPOINT);
	private static ClassBasedDLTKExtensionManager sourceParsersManager = new NewInstanceClassBasedDLTKExtensionManager(SOURCE_PARSERS_EXTPOINT);
	
	private static ClassBasedDLTKExtensionManager searchManager = new ClassBasedDLTKExtensionManager(SEARCH_EXTPOINT);
	private static ClassBasedDLTKExtensionManager callHierarchyManager = new ClassBasedDLTKExtensionManager(CALLHIERARCHY_EXTPOINT);
	
		
	public static IDLTKLanguageToolkit getLanguageToolkit(String natureId)
			throws CoreException {

		return (IDLTKLanguageToolkit) instance.getObject(natureId);
	}

	private static IDLTKLanguageToolkit findAppropriateToolkitByObject(
			Object object) {
		ElementInfo[] elementInfos = instance.getElementInfos();
		for (int j = 0; j < elementInfos.length; j++) {
			try {
				IDLTKLanguageToolkit toolkit = (IDLTKLanguageToolkit) instance
						.getInitObject(elementInfos[j]);
				if (object instanceof IResource) {
					if (toolkit.validateSourceModule((IResource) object)
							.getSeverity() == Status.OK) {
						return toolkit;
					}
				} else if (object instanceof IPath) {
					if (toolkit.validateSourceModule((IPath) object)
							.getSeverity() == Status.OK) {
						return toolkit;
					}
				} else {
					return null;
				}
			} catch (CoreException ex) {
				if (DLTKCore.DEBUG) {
					ex.printStackTrace();
				}
			}
		}
		return null;
	}

	public static boolean hasScriptNature(IProject project) {
		try {
			return instance.findScriptNature(project) != null;
		} catch (CoreException e) {
			// not existent or closed
			return false;
		}
	}

	public static IDLTKLanguageToolkit getLanguageToolkit(IModelElement element)
			throws CoreException {
		return (IDLTKLanguageToolkit) instance.getObject(element);
	}

	public static IDLTKLanguageToolkit findToolkit(IResource resource) {
		return findAppropriateToolkitByObject(resource);
	}

	public static IDLTKLanguageToolkit findToolkit(IPath path) {
		return findAppropriateToolkitByObject(path);
	}
	
	public static ISourceElementParser getSourceElementParser( String nature ) throws CoreException {
		return (ISourceElementParser) sourceElementParsersManager.getObject(nature);
	}
	
	public static ISourceElementParser getSourceElementParser( IModelElement element ) throws CoreException {
		return (ISourceElementParser) sourceElementParsersManager.getObject(element);
	}
	
//	public static ISourceParser getSourceParser( String nature ) throws CoreException {
//		return (ISourceElementParser) sourceParsersManager.getObject(nature);
//	}
//	
//	public static ISourceParser getSourceParser( IModelElement element ) throws CoreException {
//		return (ISourceElementParser) sourceParsersManager.getObject(element);
//	}

	public static IProblemFactory getProblemFactory(String natureID) throws CoreException {
		IProblemFactory factory = (IProblemFactory) problemFactoryManager.getObject(natureID);
		if( factory != null ) {
			return factory;
		}
		return new DefaultProblemFactory();
	}
	public static IProblemFactory getProblemFactory(IModelElement element) throws CoreException {
		IProblemFactory factory = (IProblemFactory) problemFactoryManager.getObject(element);
		if( factory != null ) {
			return factory;
		}
		return new DefaultProblemFactory();
	}

	public static ICompletionEngine getCompletionEngine(String natureID) throws CoreException {
		return (ICompletionEngine) completionEngineManager.getObject(natureID);
	}
	public static ISelectionEngine getSelectionEngine(String natureID) throws CoreException {
		return (ISelectionEngine) selectionEngineManager.getObject(natureID);
	}
	public static ISourceParser getSourceParser(String natureID) throws CoreException {
		return (ISourceParser) sourceParsersManager.getObject(natureID);
	}

	public static DLTKSearchParticipant createSearchParticipant(String natureID) {
		ISearchFactory factory = getSearchFactory(natureID);
		if( factory != null ) {
			DLTKSearchParticipant participant = factory.createSearchParticipant();
			if( participant != null ) {
				return participant;
			}
		}
		return new DLTKSearchParticipant();
	}

	private static ISearchFactory getSearchFactory(String natureID) {
		ISearchFactory factory = null;
		try {
			factory = (ISearchFactory) searchManager.getObject(natureID);
		} catch (CoreException e) {
			if( DLTKCore.DEBUG ) {
				e.printStackTrace();
			}
		}
		return factory;
	}

	public static MatchLocator createMatchLocator(String natureID,
			SearchPattern pattern, SearchRequestor requestor,
			IDLTKSearchScope scope, SubProgressMonitor subProgressMonitor) {
		ISearchFactory factory = getSearchFactory(natureID);
		if( factory != null ) {
			MatchLocator locator = factory.createMatchLocator(pattern, requestor, scope, subProgressMonitor);
			if( locator != null ) {
				return locator;
			}
		}
		return new MatchLocator(pattern, requestor, scope, subProgressMonitor);
	}

	public static SourceIndexerRequestor createSourceRequestor(String natureID) {
		ISearchFactory factory = getSearchFactory(natureID);
		if( factory != null ) {
			SourceIndexerRequestor requestor = factory.createSourceRequestor();
			if( requestor != null ) {
				return requestor;
			}
		}
		return new SourceIndexerRequestor();
	}

	public static IMatchLocatorParser createMatchParser(String natureID,
			MatchLocator matchLocator) {
		ISearchFactory factory = getSearchFactory(natureID);
		if( factory != null ) {
			return factory.createMatchParser(matchLocator);
		}
		return null;
	}

	public static ICalleeProcessor createCalleeProcessor(String natureID, IMethod member,
			IProgressMonitor progressMonitor, IDLTKSearchScope scope) {
		ICallHierarchyFactory factory = getCallHierarchyFactory(natureID);
		if( factory != null ) {
			ICalleeProcessor processor = factory.createCalleeProcessor(member, progressMonitor, scope);
			return processor;
		}
		return null;
	}

	private static ICallHierarchyFactory getCallHierarchyFactory(String natureID) {
		ICallHierarchyFactory factory = null;
		try {
			factory = (ICallHierarchyFactory) callHierarchyManager.getObject(natureID);
		} catch (CoreException e) {
			if( DLTKCore.DEBUG ) {
				e.printStackTrace();
			}
		}
		return factory;
	}

	public static ICallProcessor createCallProcessor(String natureID) {
		ICallHierarchyFactory factory = getCallHierarchyFactory(natureID);
		if( factory != null ) {
			return factory.createCallProcessor();
		}
		return null;
	}
}