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;
  import java.util.ArrayList;
  import java.util.List;
  
  /**
   * Locator that searches source files in multiple {@link ISourceFileLocator}
   * instances. For each lookup request the first locator that returns a
   * {@link Reader} for source content is selected.
   */
  public class MultiSourceFileLocator implements ISourceFileLocator {
  
  	private final int tabWidth;
  
  	private final List<ISourceFileLocator> delegates;
  
  	/**
  	 * Creates a new empty locator.
  	 * 
  	 * @param tabWidth
  	 *            tab width in source files as number of blanks used for all
  	 *            source files
  	 */
  	public MultiSourceFileLocator(final int tabWidth) {
  		this.tabWidth = tabWidth;
  		this.delegates = new ArrayList<ISourceFileLocator>();
  	}
  
  	/**
  	 * Adds the given locator. Locators are queried in the sequence they have
  	 * been added.
  	 * 
  	 * @param locator
  	 *            Additional locator to query
  	 */
  	public void add(final ISourceFileLocator locator) {
  		delegates.add(locator);
  	}
  
  	public Reader getSourceFile(final String packageName, final String fileName)
  			throws IOException {
  		for (final ISourceFileLocator d : delegates) {
  			final Reader reader = d.getSourceFile(packageName, fileName);
  			if (reader != null) {
  				return reader;
  			}
  		}
  		return null;
  	}
  
  	public int getTabWidth() {
  		return tabWidth;
  	}
  
  }
  