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.internal.html.table;
  
  import java.io.IOException;
  import java.math.BigDecimal;
  import java.math.RoundingMode;
  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 that prints the coverage percentage for each item and the total
   * percentage in the footer. The implementation is stateless, instances might be
   * used in parallel.
   */
  public class PercentageColumn implements IColumnRenderer {
  
  	private final CounterEntity entity;
  
  	private final NumberFormat percentageFormat;
  
  	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 this column
  	 * @param locale
  	 *            locale for rendering numbers
  	 */
  	public PercentageColumn(final CounterEntity entity, final Locale locale) {
  		this.entity = entity;
  		this.percentageFormat = NumberFormat.getPercentInstance(locale);
  		comparator = new TableItemComparator(
  				CounterComparator.MISSEDRATIO.on(entity));
  	}
  
  	public boolean init(final List<? extends ITableItem> items,
  			final ICoverageNode total) {
  		return true;
  	}
  
  	public void footer(final HTMLElement td, final ICoverageNode total,
  			final Resources resources, final ReportOutputFolder base)
  			throws IOException {
  		cell(td, total);
  	}
  
  	public void item(final HTMLElement td, final ITableItem item,
  			final Resources resources, final ReportOutputFolder base)
  			throws IOException {
  		cell(td, item.getNode());
  	}
  
  	private void cell(final HTMLElement td, final ICoverageNode node)
  			throws IOException {
  		final ICounter counter = node.getCounter(entity);
  		final int total = counter.getTotalCount();
  		if (total == 0) {
  			td.text("n/a");
  		} else {
  			td.text(format(counter.getCoveredRatio()));
  		}
  	}
  
  	/**
  	 * Ratio 199/(1+199)=0.995 must be displayed as "99%", not as "100%".
  	 * Unfortunately {@link NumberFormat} uses {@link RoundingMode#HALF_EVEN} by
  	 * default and ability to change available only starting from JDK 6, so
  	 * perform rounding using {@link RoundingMode#FLOOR} before formatting.
  	 */
  	private String format(double ratio) {
  		return percentageFormat.format(
  				BigDecimal.valueOf(ratio).setScale(2, RoundingMode.FLOOR));
  	}
  
  	public Comparator<ITableItem> getComparator() {
  		return comparator;
  	}
  
  }
  