TranslatorFactory.java

/*
 * Copyright (c) 2015, SRI International
 * All rights reserved.
 * Licensed under the The BSD 3-Clause License;
 * you may not use this file except in compliance with the License.
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 * 
 * http://opensource.org/licenses/BSD-3-Clause
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package com.sri.ai.praise.lang.translate;

import java.util.HashMap;
import java.util.Map;

import com.google.common.annotations.Beta;
import com.sri.ai.praise.lang.ModelLanguage;
import com.sri.ai.praise.lang.translate.impl.HOGMv1_to_UAI_Translator;
import com.sri.ai.praise.lang.translate.impl.UAI_to_HOGMv1_Using_Inequalities_Translator;
import com.sri.ai.praise.lang.translate.impl.UAI_to_HuginDotNet_Translator;
import com.sri.ai.util.base.Pair;

/**
 * A factory class for constructing translators by name.
 * 
 * @author oreilly
 *
 */
@Beta
public class TranslatorFactory {
	public static final Map<Pair<ModelLanguage, ModelLanguage>, Class<?>> _translators = new HashMap<>();
	static {
		_translators.put(new Pair<>(ModelLanguage.HOGMv1, ModelLanguage.UAI), HOGMv1_to_UAI_Translator.class);
		//
		_translators.put(new Pair<>(ModelLanguage.UAI, ModelLanguage.HOGMv1),      UAI_to_HOGMv1_Using_Inequalities_Translator.class);
//		_translators.put(new Pair<>(ModelLanguage.UAI, ModelLanguage.HOGMv1),      UAI_to_HOGMv1_Using_Equalities_Translator.class);
		_translators.put(new Pair<>(ModelLanguage.UAI, ModelLanguage.HuginDotNet), UAI_to_HuginDotNet_Translator.class);
//TODO - implementations of:
// Church -> HOGMv1
// HOGMv1 -> PMTK3
// HOGMv1 -> HuginDotNet		
//
// PagedModelContainer -> Church
// PagedModelContainer -> HOGMv1
// Church              -> PagedModelContainer
// HOGMv1              -> PagedModelContainer		
	};
	
	/**
	 * Instantiate a new Translator based on the given source->target mapping.
	 * @param source
	 *        the source modeling language to translate from.
	 * @param target
	 *        the target modeling language to translate to.
	 * @return a new Translator instance capable of translating source->target
	 * @throws RuntimeException if unable to instantiate a translator for the given source and target.
	 */
	public static Translator newTranslator(ModelLanguage source, ModelLanguage target) {
		Translator result          = null;
		Class<?>   translatorClass = _translators.get(new Pair<ModelLanguage, ModelLanguage>(source, target));
		
		try {
			result = (Translator) translatorClass.newInstance();
		}
		catch (Exception ex) {
			throw new RuntimeException("Unable to create a new translator for "+source+"->"+target, ex);
		}
		
		return result;
	}
}