/*******************************************************************************
 * Copyright (c) 2004-2008 Andras Schmidt, Andras Balogh, Istvan Rath and Daniel Varro
 * 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
 *
 * Contributors:
 *    Andras Schmidt, Andras Balogh, Istvan Rath - initial API and implementation
 *******************************************************************************/

package org.eclipse.viatra2.framework;

import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.eclipse.viatra2.buffers.BufferStore;
import org.eclipse.viatra2.codegen.CodeOutputPlugin;
import org.eclipse.viatra2.errors.VPMRuntimeException;
import org.eclipse.viatra2.framework.properties.VPMProperties;
import org.eclipse.viatra2.logger.Logger;

/**
 * A code formatter implementation, that accumulates many code formatters. Code
 * formatters can be plugged into this code formatter and all output will be
 * forwarded to all plugged code formatters. This module is used by the VPM
 * modeling framework to make it available to use more code output plugins the
 * same time.
 * 
 * @author Andras Schmidt
 * 
 *         Modified on 2006.09.14 by Istvan Rath: - added logger, props
 *         references - added a call to a listener's init() function upon
 *         registration (add()) Modified on 2008.07.30 by Istvan Rath - add
 *         IFramework reference - update API
 * 
 */
public class MultiCodeFormatter implements CodeOutputPlugin {

	protected VPMProperties props;

	protected Logger logger;

	protected IFramework frame;

	public void beginWork() {
		for (int i = 0; i < listeners.size(); ++i) {
			CodeOutputPlugin cp = listeners.get(i);
			cp.beginWork();
		}
	}

	public void codeOut(String s) throws VPMRuntimeException {
		for (int i = 0; i < listeners.size(); ++i) {
			CodeOutputPlugin cp = listeners.get(i);
			cp.codeOut(s);
		}
	}

	public void endWork() {
		for (int i = 0; i < listeners.size(); ++i) {
			CodeOutputPlugin cp = listeners.get(i);
			cp.endWork();
		}
		// close file buffers in the buffer store
		Set<Map.Entry<String, FileWriter>> fileBuffers = BufferStore
				.getAllFileBuffers(frame.getTopmodel());
		if (fileBuffers != null) {
			try {
				for (Map.Entry<String, FileWriter> buf : fileBuffers) {
					buf.getValue().flush();
					buf.getValue().close();
				}
			} catch (IOException e) {
				logger.fatal(e.getMessage());
			}
			// remove stale file buffers
			BufferStore.removeFileBuffers(frame.getTopmodel());
		}
	}

	public void init(IFramework fw) {
		frame = fw;
		props = fw.getProperties();
		logger = fw.getLogger();
	}

	List<CodeOutputPlugin> listeners = new ArrayList<CodeOutputPlugin>();

	/**
	 * Add a listening code output plugin.
	 * 
	 * @param listener
	 *            this plugin will get all code out events from now
	 */
	public void addListener(CodeOutputPlugin listener) {
		listeners.add(listener);
		listener.init(frame);
	}

	/**
	 * Remove a listening code output plugin.
	 * 
	 * @param listener
	 *            this plugin will not get all code out events from now
	 */
	public void removeListener(CodeOutputPlugin listener) {
		listeners.remove(listener);
	}

	/**
	 * Get all listeners of this code out pipeline
	 * 
	 * @returns all listeners
	 */
	public Collection<CodeOutputPlugin> getListeners() {
		return listeners;
	}

}