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/*******************************************************************************
 * 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.eclipse.xtext;

import com.google.inject.Inject;
import com.google.inject.Singleton;
import com.google.inject.name.Named;

/**
 * Convenient access to language specific information.
 * 
 * @author Sebastian Zarnekow - Initial contribution and API
 * @since 2.3
 * @noextend This class is not intended to be subclassed by clients.
 * @noinstantiate This class is not intended to be instantiated by clients.
 */
@Singleton
public class LanguageInfo {

	private final String languageName;
	
	/**
	 * @param languageName the language name. May not be null.
	 */
	@Inject
	public LanguageInfo(@Named(Constants.LANGUAGE_NAME) String languageName) {
		if (languageName == null)
			throw new IllegalArgumentException("languageName may not be null");
		this.languageName = languageName;
	}

	/**
	 * @return the language name. Never null.
	 */
	public String getLanguageName() {
		return languageName;
	}
	
	public String getShortName() {
		int lastIndex = languageName.lastIndexOf('.');
		if (lastIndex == -1)
			return getLanguageName();
		return getLanguageName().substring(lastIndex+1);
	}

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

	@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (obj == null)
			return false;
		if (getClass() != obj.getClass())
			return false;
		LanguageInfo other = (LanguageInfo) obj;
		if (!languageName.equals(other.languageName))
			return false;
		return true;
	}
	
}