/*
 * ============LICENSE_START======================================================= 
 * ONAP - SO 
 * ================================================================================ 
 * 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. 
 * ============LICENSE_END========================================================= 
 */ 

package org.openecomp.mso.bpmn.mock;

import java.io.IOException;
import java.io.InputStream;
import org.openecomp.mso.logger.MsoLogger;

/**
 * 
 * File utility class.<br/>
 * <p>
 * </p>
 * 
 * @author
 * @version     ONAP  Sep 15, 2017
 */
public class FileUtil {

    private static final MsoLogger LOGGER = MsoLogger.getMsoLogger (MsoLogger.Catalog.RA);
    
	/**
	 * Read the specified resource file and return the contents as a String.
	 * 
	 * @param fileName Name of the resource file
	 * @return the contents of the resource file as a String
	 * @throws IOException if there is a problem reading the file
	 */
	public static String readResourceFile(String fileName) {
		InputStream stream;
		try {
			stream = getResourceAsStream(fileName);
			byte[] bytes;
			bytes = new byte[stream.available()];
			stream.read(bytes);
			stream.close();
			return new String(bytes);
		} catch (IOException e) {
		    LOGGER.debug("Exception:", e);
			return "";
		}
	}
	
	/**
	 * Get an InputStream for the resource specified.
	 * 
	 * @param resourceName Name of resource for which to get InputStream.
	 * @return an InputStream for the resource specified.
	 * @throws IOException If we can't get the InputStream for whatever reason.
	 */
	private static InputStream getResourceAsStream(String resourceName) throws IOException {
		InputStream stream =
				FileUtil.class.getClassLoader().getResourceAsStream(resourceName);
		if (stream == null) {
			throw new IOException("Can't access resource '" + resourceName + "'");
		}
		return stream;
	}		
}