# ElementIndex.java

    /*******************************************************************************
     * Copyright (c) 2009, 2013 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.internal.html.index;

    import java.util.HashMap;
    import java.util.Map;

    import org.jacoco.report.internal.ReportOutputFolder;
    import org.jacoco.report.internal.html.ILinkable;

    /**
     * An index over all report pages that allows queries according to certain
     * criteria.
     */
    public class ElementIndex implements IIndexUpdate {

    	private final ReportOutputFolder baseFolder;

    	private final Map<Long, String> allClasses = new HashMap<Long, String>();

    	/**
    	 * Creates a new empty index for a HTML report.
    	 *
    	 * @param baseFolder
    	 *            base folder where all links are calculated relative to
    	 */
    	public ElementIndex(final ReportOutputFolder baseFolder) {
    		this.baseFolder = baseFolder;
    	}

    	/**
    	 * Returns the link to the class with the given identifier if a
    	 * corresponding page exists.
    	 *
    	 * @param classid
    	 *            class identifier
    	 * @return Link or null
    	 */
    	public String getLinkToClass(final long classid) {
    		return allClasses.get(Long.valueOf(classid));
    	}

    	// === IIndexUpdater ===

    	public void addClass(final ILinkable link, final long classid) {
    		allClasses.put(Long.valueOf(classid), link.getLink(baseFolder));
    	}

    }