/*******************************************************************************
 * Copyright (c) 2009, 2015 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.ant;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Map;

import org.apache.tools.ant.types.Resource;
import org.jacoco.report.InputStreamSourceFileLocator;

/**
 * Source locator based on Ant file resources.
 */
class AntFilesLocator extends InputStreamSourceFileLocator {

	private final Map<String, Resource> resources;

	public AntFilesLocator(final String encoding,
			final int tabWidth) {
		super(encoding, tabWidth);
		this.resources = new HashMap<String, Resource>();
	}

	/**
	 * Adds the given file resource as a potential source file.
	 * 
	 * @param file
	 *            file resource to add
	 */
	void add(final Resource file) {
		resources.put(file.getName().replace(File.separatorChar, '/'), file);
	}

	@Override
	protected InputStream getSourceStream(final String path) throws IOException {
		final Resource file = resources.get(path);
		if (file == null) {
			return null;
		} else {
			return file.getInputStream();
		}
	}

}