content: /*******************************************************************************
   * Copyright (c) 2009, 2019 Mountainminds GmbH & Co. KG and Contributors
   * 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:
   *    Marc R. Hoffmann - initial API and implementation
   *    
   *******************************************************************************/
  package org.jacoco.report;
  
  import java.io.IOException;
  import java.io.Reader;
  
  /**
   * Interface to look-up source files that will be included with the report.
   */
  public interface ISourceFileLocator {
  
  	/**
  	 * Tries to locate the given source file and opens a reader with the
  	 * appropriate encoding.
  	 * 
  	 * @param packageName
  	 *            VM name of the package
  	 * @param fileName
  	 *            name of the source file
  	 * @return reader if the file could be located, <code>null</code> otherwise
  	 * @throws IOException
  	 *             in case of problems while opening the file
  	 */
  	Reader getSourceFile(String packageName, String fileName)
  			throws IOException;
  
  	/**
  	 * Returns number of blank characters that represent a tab in source code.
  	 * 
  	 * @return tab width as number of blanks
  	 */
  	int getTabWidth();
  
  }
  