/*
 * JFugue, an Application Programming Interface (API) for Music Programming
 * http://www.jfugue.org
 *
 * Copyright (C) 2003-2014 David Koelle
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *     http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.staccato.functions;

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

import org.staccato.PreprocessorFunction;
import org.staccato.SubparserFunction;

public class FunctionManager {
	private static FunctionManager instance;
	
	public static FunctionManager getInstance() {
		if (instance == null) {
			instance = new FunctionManager();
		}
		return instance;
	}
	
	private Map<String, PreprocessorFunction> preprocessorFunctions;
	private Map<String, SubparserFunction> subparserFunctions;
	
	private FunctionManager() { 
		this.preprocessorFunctions = new HashMap<String, PreprocessorFunction>();
		this.subparserFunctions = new HashMap<String, SubparserFunction>();		
	}
	
	//
	// Preprocessor Functions
	//
	
	public void addPreprocessorFunction(PreprocessorFunction function) {
		for (String name : function.getNames()) {
			preprocessorFunctions.put(name.toUpperCase(), function);
		}
	}
	
	public void removePreprocessorFunction(PreprocessorFunction function) {
		for (String name : function.getNames()) {
			preprocessorFunctions.remove(name.toUpperCase());
		}
	}
	
	public PreprocessorFunction getPreprocessorFunction(String name) {
		return preprocessorFunctions.get(name.toUpperCase());
	}
	
	//
	// Subparser Functions
	//

	public void addSubparserFunction(SubparserFunction function) {
		for (String name : function.getNames()) {
			subparserFunctions.put(name.toUpperCase(), function);
		}
	}
	
	public void removeSubparserFunction(SubparserFunction function) {
		for (String name : function.getNames()) {
			subparserFunctions.remove(name.toUpperCase());
		}
	}

	public SubparserFunction getSubparserFunction(String name) {
		return subparserFunctions.get(name.toUpperCase());
	}
}