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-<?xml version="1.0" encoding="ISO-8859-1" ?>

-<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

-<html xmlns="http://www.w3.org/1999/xhtml" lang="en">

-<head>

-  <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" />

-  <link rel="stylesheet" href=".resources/doc.css" charset="ISO-8859-1" type="text/css" />

-  <link rel="shortcut icon" href=".resources/report.gif" type="image/gif" />

-  <title>JaCoCo - Coverage Counter</title>

-</head>

-<body>

-

-<div class="breadcrumb">

-  <a href="../index.html" class="el_report">JaCoCo</a> &gt;

-  <a href="index.html" class="el_group">Documentation</a> &gt;

-  <span class="el_source">Coverage Counters</span>

-</div>

-<div id="content"> 

-

-<h1>Coverage Counters</h1>

-

-<p>

-  JaCoCo uses a set of different counters to calculate coverage metrics. All

-  these counters are derived from information contained in Java class files

-  which basically are Java byte code instructions and debug information 

-  optionally embedded in class files. This approach allows efficient on-the-fly

-  instrumentation and analysis of applications even when no source code is

-  available. In most cases the collected information can be mapped back to

-  source code and visualized down to line level granularity. Anyhow there are

-  limitations to this approach. The class files have to be compiled with debug

-  information to calculate line level coverage and provide source highlighting.

-  Not all Java language constructs can be directly compiled to corresponding

-  byte code. In such cases the Java compiler creates so called <i>synthetic</i>

-  code which sometimes results in unexpected code coverage results. 

-</p>

-

-<h2>Instructions (C0 Coverage)</h2>

-

-<p>

-  The smallest unit JaCoCo counts are single Java byte code instructions.

-  <i>Instruction coverage</i> provides information about the amount of code that

-  has been executed or missed. This metric is completely independent from source

-  formatting and always available, even in absence of debug information in the

-  class files.

-</p>

-

-<h2>Branches (C1 Coverage)</h2>

-

-<p>

-  JaCoCo also calculates <i>branch coverage</i> for all <code>if</code> and

-  <code>switch</code> statements. This metric counts the total number of such

-  branches in a method and determines the number of executed or missed branches.

-  Branch coverage is always available, even in absence of debug information in

-  the class files. Note that exception handling is not considered as branches

-  in the context of this counter definition.

-</p>

-

-<p>

-  If the class files haven been compiled with debug information decision points

-  can be mapped to source lines and highlighted accordingly:

-</p>

-

-<ul>

-  <li>No coverage: No branches in the line has been executed (red diamond)</li>

-  <li>Partial coverage: Only a part of the branches in the line have been

-      executed (yellow diamond)</li>

-  <li>Full coverage: All branches in the line have been executed (green diamond)</li>

-</ul>

-

-<h2>Cyclomatic Complexity</h2>

-

-<p>

-  JaCoCo also calculates cyclomatic complexity for each non-abstract method and

-  summarizes complexity for classes, packages and groups. According to its

-  definition by

-  <a href="http://hissa.nist.gov/HHRFdata/Artifacts/ITLdoc/235/title.htm">McCabe1996</a>

-  cyclomatic complexity is the minimum number of paths that can, in (linear)

-  combination, generate all possible paths through a method. Thus the

-  complexity value can serve as an indication for the number of unit test cases

-  to fully cover a certain piece of software. Complexity figures can always be

-  calculated, even in absence of debug information in the class files.

-</p>

-

-<p>

-  The formal definition of the cyclomatic complexity v(G) is based on the

-  representation of a method's control flow graph as a directed graph:  

-</p>

-

-<blockquote>

-  v(G) = E - N + 2

-</blockquote>

-

-<p>

-  Where E is the number of edges and N the number of nodes. JaCoCo calculates

-  cyclomatic complexity of a method with the following equivalent equation based

-  on the number of branches (B) and the number of decision points (D):

-</p>

-

-<blockquote>

-  v(G) = B - D + 1

-</blockquote>

-

-<p>

-  Based on the coverage status of each branch JaCoCo also calculates covered and

-  missed complexity for each method. Missed complexity again is an indication

-  for the number of test cases missing to fully cover a module. Note that as

-  JaCoCo does not consider exception handling as branches try/catch blocks will

-  also not increase complexity.

-</p>

-

-<h2>Lines</h2>

-

-<p>

-  For all class files that have been compiled with debug information, coverage

-  information for individual lines can be calculated. A source line is

-  considered executed when at least one instruction that is assigned to this

-  line has been executed.

-</p>

-

-<p>

-  Due to the fact that a single line typically compiles to multiple byte code

-  instructions the source code highlighting shows three different status for

-  each line containing source code: 

-</p>

-

-<ul>

-  <li>No coverage: No instruction in the line has been executed (red

-      background)</li>

-  <li>Partial coverage: Only a part of the instruction in the line have been

-      executed (yellow background)</li>

-  <li>Full coverage: All instructions in the line have been executed (green

-      background)</li>

-</ul>

-

-<h2>Methods</h2>

-

-<p>

-  Each non-abstract method contains at least one instruction. A method is

-  considered as executed when at least one instruction has been executed. As

-  JaCoCo works on byte code level also constructors and static initializers are

-  counted as methods. Some of these methods may not have a direct correspondence

-  in Java source code, like implicit and thus generated default constructors or

-  initializers for constants.

-</p>

-

-<h2>Classes</h2>

-

-<p>

-  A class is considered as executed when at least one of its methods has been

-  executed. Note that JaCoCo considers constructors as well as static

-  initializers as methods. As Java interface types may contain static

-  initializers such interfaces are also considered as executable classes.

-</p>

-

-</div> 

-<div class="footer">

-  <span class="right"><a href="@jacoco.home.url@">JaCoCo</a> @qualified.bundle.version@</span>

-  <a href="license.html">Copyright</a> &copy; @copyright.years@ Mountainminds GmbH &amp; Co. KG and Contributors

-</div>

-

-</body>

-</html>
\ No newline at end of file
+<?xml version="1.0" encoding="ISO-8859-1" ?>
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml" lang="en">
+<head>
+  <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" />
+  <link rel="stylesheet" href=".resources/doc.css" charset="ISO-8859-1" type="text/css" />
+  <link rel="shortcut icon" href=".resources/report.gif" type="image/gif" />
+  <title>JaCoCo - Coverage Counter</title>
+</head>
+<body>
+
+<div class="breadcrumb">
+  <a href="../index.html" class="el_report">JaCoCo</a> &gt;
+  <a href="index.html" class="el_group">Documentation</a> &gt;
+  <span class="el_source">Coverage Counters</span>
+</div>
+<div id="content"> 
+
+<h1>Coverage Counters</h1>
+
+<p>
+  JaCoCo uses a set of different counters to calculate coverage metrics. All
+  these counters are derived from information contained in Java class files
+  which basically are Java byte code instructions and debug information 
+  optionally embedded in class files. This approach allows efficient on-the-fly
+  instrumentation and analysis of applications even when no source code is
+  available. In most cases the collected information can be mapped back to
+  source code and visualized down to line level granularity. Anyhow there are
+  limitations to this approach. The class files have to be compiled with debug
+  information to calculate line level coverage and provide source highlighting.
+  Not all Java language constructs can be directly compiled to corresponding
+  byte code. In such cases the Java compiler creates so called <i>synthetic</i>
+  code which sometimes results in unexpected code coverage results. 
+</p>
+
+<h2>Instructions (C0 Coverage)</h2>
+
+<p>
+  The smallest unit JaCoCo counts are single Java byte code instructions.
+  <i>Instruction coverage</i> provides information about the amount of code that
+  has been executed or missed. This metric is completely independent from source
+  formatting and always available, even in absence of debug information in the
+  class files.
+</p>
+
+<h2>Branches (C1 Coverage)</h2>
+
+<p>
+  JaCoCo also calculates <i>branch coverage</i> for all <code>if</code> and
+  <code>switch</code> statements. This metric counts the total number of such
+  branches in a method and determines the number of executed or missed branches.
+  Branch coverage is always available, even in absence of debug information in
+  the class files. Note that exception handling is not considered as branches
+  in the context of this counter definition.
+</p>
+
+<p>
+  If the class files haven been compiled with debug information decision points
+  can be mapped to source lines and highlighted accordingly:
+</p>
+
+<ul>
+  <li>No coverage: No branches in the line has been executed (red diamond)</li>
+  <li>Partial coverage: Only a part of the branches in the line have been
+      executed (yellow diamond)</li>
+  <li>Full coverage: All branches in the line have been executed (green diamond)</li>
+</ul>
+
+<h2>Cyclomatic Complexity</h2>
+
+<p>
+  JaCoCo also calculates cyclomatic complexity for each non-abstract method and
+  summarizes complexity for classes, packages and groups. According to its
+  definition by
+  <a href="http://hissa.nist.gov/HHRFdata/Artifacts/ITLdoc/235/title.htm">McCabe1996</a>
+  cyclomatic complexity is the minimum number of paths that can, in (linear)
+  combination, generate all possible paths through a method. Thus the
+  complexity value can serve as an indication for the number of unit test cases
+  to fully cover a certain piece of software. Complexity figures can always be
+  calculated, even in absence of debug information in the class files.
+</p>
+
+<p>
+  The formal definition of the cyclomatic complexity v(G) is based on the
+  representation of a method's control flow graph as a directed graph:  
+</p>
+
+<blockquote>
+  v(G) = E - N + 2
+</blockquote>
+
+<p>
+  Where E is the number of edges and N the number of nodes. JaCoCo calculates
+  cyclomatic complexity of a method with the following equivalent equation based
+  on the number of branches (B) and the number of decision points (D):
+</p>
+
+<blockquote>
+  v(G) = B - D + 1
+</blockquote>
+
+<p>
+  Based on the coverage status of each branch JaCoCo also calculates covered and
+  missed complexity for each method. Missed complexity again is an indication
+  for the number of test cases missing to fully cover a module. Note that as
+  JaCoCo does not consider exception handling as branches try/catch blocks will
+  also not increase complexity.
+</p>
+
+<h2>Lines</h2>
+
+<p>
+  For all class files that have been compiled with debug information, coverage
+  information for individual lines can be calculated. A source line is
+  considered executed when at least one instruction that is assigned to this
+  line has been executed.
+</p>
+
+<p>
+  Due to the fact that a single line typically compiles to multiple byte code
+  instructions the source code highlighting shows three different status for
+  each line containing source code: 
+</p>
+
+<ul>
+  <li>No coverage: No instruction in the line has been executed (red
+      background)</li>
+  <li>Partial coverage: Only a part of the instruction in the line have been
+      executed (yellow background)</li>
+  <li>Full coverage: All instructions in the line have been executed (green
+      background)</li>
+</ul>
+
+<h2>Methods</h2>
+
+<p>
+  Each non-abstract method contains at least one instruction. A method is
+  considered as executed when at least one instruction has been executed. As
+  JaCoCo works on byte code level also constructors and static initializers are
+  counted as methods. Some of these methods may not have a direct correspondence
+  in Java source code, like implicit and thus generated default constructors or
+  initializers for constants.
+</p>
+
+<h2>Classes</h2>
+
+<p>
+  A class is considered as executed when at least one of its methods has been
+  executed. Note that JaCoCo considers constructors as well as static
+  initializers as methods. As Java interface types may contain static
+  initializers such interfaces are also considered as executable classes.
+</p>
+
+</div> 
+<div class="footer">
+  <span class="right"><a href="@jacoco.home.url@">JaCoCo</a> @qualified.bundle.version@</span>
+  <a href="license.html">Copyright</a> &copy; @copyright.years@ Mountainminds GmbH &amp; Co. KG and Contributors
+</div>
+
+</body>
+</html>