AbstractLanguageInfo.java

/*******************************************************************************
 * Copyright (c) 2012 itemis AG (http://www.itemis.eu) 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.xpect.registry;

import java.util.List;
import java.util.Map;
import java.util.Set;

import org.xpect.registry.IEmfFileExtensionInfo.IXtextFileExtensionInfo;

import com.google.common.collect.ImmutableList;
import com.google.common.collect.Maps;
import com.google.inject.Injector;
import com.google.inject.Module;

/**
 * @author Moritz Eysholdt - Initial contribution and API
 */
public abstract class AbstractLanguageInfo implements ILanguageInfo {

	private final IXtextFileExtensionInfo info;

	protected Injector injector;

	protected Map<List<Class<? extends Module>>, Injector> injectors = Maps.newHashMap();

	protected Module runtimeModule = null;

	protected Module sharedModule = null;

	protected Module uiModule = null;

	public AbstractLanguageInfo(IXtextFileExtensionInfo info) {
		this.info = info;
	}

	protected abstract Injector createInjector(Module... modules);

	@Override
	public boolean equals(Object obj) {
		if (obj == null || obj.getClass() != getClass())
			return false;
		return info.getLanguageID().equals(((AbstractLanguageInfo) obj).info.getLanguageID());
	}

	public Set<String> getFileExtensions() {
		return info.getFileExtensions();
	}

	public Injector getInjector() {
		if (injector == null)
			injector = createInjector();
		return injector;
	}

	public Injector getInjector(List<Class<? extends Module>> moduleClasses) {
		if (moduleClasses.isEmpty()) {
			return getInjector();
		} else {
			List<Class<? extends Module>> key = ImmutableList.copyOf(moduleClasses);
			Injector result = injectors.get(key);
			if (result != null)
				return result;
			Injector defaultInjector = getInjector();
			Module[] modules = new Module[moduleClasses.size()];
			for (int i = 0; i < moduleClasses.size(); i++)
				modules[i] = defaultInjector.getInstance(moduleClasses.get(i));
			result = createInjector(modules);
			injectors.put(key, result);
			return result;
		}
	}

	public String getLanguageName() {
		return info.getLanguageID();
	}

	protected Module getRuntimeModule() {
		if (runtimeModule == null) {
			try {
				Class<? extends Module> clazz = getRuntimeModuleClass();
				runtimeModule = clazz.newInstance();
			} catch (InstantiationException e) {
				throw new RuntimeException(e);
			} catch (IllegalAccessException e) {
				throw new RuntimeException(e);
			}
		}
		return runtimeModule;
	}

	public Class<? extends Module> getRuntimeModuleClass() {
		return info.getRuntimeModule().load();
	}

	protected Module getSharedStateModule() {
		if (sharedModule == null) {
			Class<Module> module = info.getSharedModule().load();
			try {
				sharedModule = module.newInstance();
			} catch (InstantiationException e) {
				throw new RuntimeException(e);
			} catch (IllegalAccessException e) {
				throw new RuntimeException(e);
			}
		}
		return sharedModule;
	}

	public String getUiLangName() {
		return info.getUIModule().getName();
	}

	public Class<? extends Module> getUIModuleClass() {
		return info.getUIModule().load();
	}

	@Override
	public int hashCode() {
		return info.getLanguageID().hashCode();
	}

}