# BarColumn.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.table;

    import java.io.IOException;
    import java.text.DecimalFormat;
    import java.text.NumberFormat;
    import java.util.Comparator;
    import java.util.List;
    import java.util.Locale;

    import org.jacoco.core.analysis.CounterComparator;
    import org.jacoco.core.analysis.ICounter;
    import org.jacoco.core.analysis.ICoverageNode;
    import org.jacoco.core.analysis.ICoverageNode.CounterEntity;
    import org.jacoco.report.internal.ReportOutputFolder;
    import org.jacoco.report.internal.html.HTMLElement;
    import org.jacoco.report.internal.html.resources.Resources;

    /**
     * Column with a graphical bar that represents the total amount of items in with
     * length, and the coverage ratio with a red/green sections. The implementation
     * is stateful, instances must not be used in parallel.
     */
    public class BarColumn implements IColumnRenderer {

    	private static final int WIDTH = 120;

    	private final CounterEntity entity;

    	private final NumberFormat integerFormat;

    	private int max;

    	private final Comparator<ITableItem> comparator;

    	/**
    	 * Creates a new column that is based on the {@link ICounter} for the given
    	 * entity.
    	 *
    	 * @param entity
    	 *            counter entity for visualization
    	 * @param locale
    	 *            locale for rendering numbers
    	 */
    	public BarColumn(final CounterEntity entity, final Locale locale) {
    		this.entity = entity;
    		this.integerFormat = DecimalFormat.getIntegerInstance(locale);
    		this.comparator = new TableItemComparator(CounterComparator.MISSEDITEMS
    				.reverse().on(entity)
    				.second(CounterComparator.TOTALITEMS.reverse().on(entity)));
    	}

    	public boolean init(final List<? extends ITableItem> items,
    			final ICoverageNode total) {
    		this.max = 0;
    		for (final ITableItem item : items) {
    			final int count = item.getNode().getCounter(entity).getTotalCount();
    			if (count > this.max) {
    				this.max = count;
    			}
    		}
    		return true;
    	}

    	public void footer(final HTMLElement td, final ICoverageNode total,
    			final Resources resources, final ReportOutputFolder base)
    			throws IOException {
    		final ICounter counter = total.getCounter(entity);
    		td.text(integerFormat.format(counter.getMissedCount())).text(" of ")
    				.text(integerFormat.format(counter.getTotalCount()));
    	}

    	public void item(final HTMLElement td, final ITableItem item,
    			final Resources resources, final ReportOutputFolder base)
    			throws IOException {
    		if (max > 0) {
    			final ICounter counter = item.getNode().getCounter(entity);
    			final int missed = counter.getMissedCount();
    			bar(td, missed, Resources.REDBAR, resources, base);
    			final int covered = counter.getCoveredCount();
    			bar(td, covered, Resources.GREENBAR, resources, base);
    		}
    	}

    	private void bar(final HTMLElement td, final int count, final String image,
    			final Resources resources, final ReportOutputFolder base)
    			throws IOException {
    		final int width = count * WIDTH / max;
    		if (width > 0) {
    			td.img(resources.getLink(base, image), width, 10,
    					integerFormat.format(count));
    		}
    	}

    	public Comparator<ITableItem> getComparator() {
    		return comparator;
    	}

    }