SITools2

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  <HEAD><TITLE>Metrics Results.</TITLE></HEAD>

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<h2>Metrics Reference</h2>

<a href="#V(G)">V(G)</a> |

<a href="#LOC">LOC</a> |

<a href="#DIT">DIT</a> |

<a href="#NOA">NOA</a> |

<a href="#NRM">NRM</a> |

<a href="#NLM">NLM</a> |

<a href="#WMC">WMC</a> |

<a href="#RFC">RFC</a> |

<a href="#DAC">DAC</a> |

<a href="#FANOUT">FANOUT</a> |

<a href="#CBO">CBO</a> |

<a href="#LCOM">LCOM</a> |

<a href="#NOC">NOC</a>

<a name="V(G)"/>

<h3>Cyclomatic Complexity - V(G)</h3>

This metric was introduced in the 1970s to measure the amount of control

flow complexity or branching complexity in a module such as a

subroutine. It gives the number of paths that may be taken through the

code, and was initially developed to give some measure of the cost of

producing a test case for the module by executing each path.

<p/>

Methods with a high cyclomatic complexity tend to be more difficult to

understand and maintain. In general the more complex the methods of an

application, the more difficult it will be to test it, and this will adversely

affect its reliability.

<p/>

V(G) is a measure of the control flow complexity of a method or

constructor.  It counts the number of branches in the body of the method,

defined as:

<ul>

<li>while statements;</li>

<li>if statements;</li>

<li>for statements.</li>

</ul>

The metric can also be configured to count each case of a switch

statement as well.

<a name="LOC"/>

<h3>Lines of Code - LOC</h3>

This is perhaps the simplest of all the metrics to define and compute.

Counting lines has a long history as a software metric dating from before

the rise of structured programming, and it is still in widespread use today.

The size of a method affects the ease with which it can be understood, its

reusability and its maintainability. There are a variety of ways that the size

can be calculated. These include counting all the lines of code, the number

of statements, the blank lines of code, the lines of commentary, and the

lines consisting only of syntax such as block delimiters.

<p/>

This metric can also be used for sizing other constructs as well, for

example, the overall size of a Java class or package can be measured by

counting the number of source lines it consists of.

<p/>

LOC can be used to determine the size of a compilation unit (source file),

class or interface, method, constructor, or field.  It can be configured to

ignore:

<ul>

<li>blank lines;</li>

<li>lines consisting only of comments;</li>

<li>lines consisting only of opening and closing braces.</li>

</ul>

<a name="DIT"/>

<h3>Depth of Inheritance Hierarchy - DIT</h3>

This metric calculates how far down the inheritance hierarchy a class is

declared. In Java all classes have java.lang.Object as their ultimate

superclass, which is defined to have a depth of 1. So a class that

immediately extends java.lang.Object has a metric value of 2; any of its

subclasses will have a value of 3, and so on.

<p/>

A class that is deep within the tree inherits more methods and state

variables, thereby increasing its complexity and making it difficult to

predict its behavior. It can be harder to understand a system with many

inheritance layers.

<p/>

DIT is defined for classes and interfaces:

<ul>

<li>all interface types have a depth of 1;</li>

<li>the class java.lang.Object has a depth of 1;</li>

<li>all other classes have a depth of 1 + the depth of their super class.</li>

</ul>

<a name="NOA"/>

<h3>Number of Attributes - NOA</h3>

The number of distinct state variables in a class serves as one measure of

its complexity. The more state a class represents the more difficult it is to

maintain invariants for it. It also hinders comprehensibility and reuse.

<p/>

In Java, state can be exposed to subclasses through protected fields, which

entails that the subclass also be aware of and maintain any invariants. This

interference with the class's data encapsulation can be a source of defects

and hidden dependencies between the state variables.

<p/>

NOA is defined for classes and interfaces.  It counts the number of fields

declared in the class or interface.

<a name="NRM"/>

<h3>Number of Remote Methods - NRM</h3>

NRM is defined for classes.  A remote method call is defined as an

invocation of a method that is not declared in any of:

<ul>

<li>the class itself;</li>

<li>a class or interface that the class extends or implements;</li>

<li>a class or method that extends the class.</li>

</ul>

The value is the count of all the remote method calls in all of the methods

and constructors of the class.

<a name="NLM"/>

<h3>Number of Local Methods - NLM</h3>

NLM is defined for classes and interfaces.  A local method is defined as a

method that is declared in the class or interface. NLM can be configured to

include the local methods of all of the class's superclasses.  Methods with

public, protected, package and private visibility can be independently

counted by setting configuration parameters.

<a name="WMC"/>

<h3>Weighted Methods per Class - WMC</h3>

If the number of methods in a class can be determined during the design

and modeling phase of a project, it can be used as a predictor of how

much time and effort is needed to develop, debug and maintain it. This

metric can be further refined by incorporating a weighting for the

complexity of each method. The usual weighting is given by the cyclomatic

complexity of the method.

<p/>

The subclasses of a class inherit all of its public and protected methods,

and possibly its package methods as well, so the number of methods a

class has directly impacts the complexity of its subclasses. Classes with

large numbers of methods are often specific to a particular application,

reducing the ability to reuse them.

<p/>

The definition of WMC is based upon NLM, and it provides the same

configuration parameters for counting inherited methods and of varying

visibility. The main difference is that NLM always counts each method as 1,

whereas WMC will weight each method. There are two weighting schemes:

<ul>

<li>V(G) the cyclomatic complexity of the method is used as its weight.

   Methods from class files are given a V(G) of 1.</li>

<li>the arity, or the number of parameters of the method are used to

   determine the weight.</li>

</ul>

<a name="RFC"/>

<h3>Response For Class - RFC</h3>

The response set of a class is the set of all methods that can be invoked as

a result of a message sent to an object of the class. This includes methods

in the class's inheritance hierarchy and methods that can be invoked on

other objects. The Response For Class metric is defined to be size of the

response set for the class. A class which provides a larger response set is

considered to be more complex than one with a smaller response set.

<p/>

One reason for this is that if a method call on a class can result in a large

number of different method calls on the target and other classes, then it

can be harder to test the behavior of the class and debug problems. It will

typically require a deeper understanding of the potential interactions that

objects of the class can have with the rest of the system.

<p/>

RFC is defined as the sum of NLM and NRM for the class.  The local methods

include all of the public, protected, package and private methods, but not

methods declared only in a superclass.

<a name="DAC"/>

<h3>Data Abstraction Coupling - DAC</h3>

DAC is defined for classes and interfaces.  It counts the number of reference

types that are used in the field declarations of the class or interface.  The

component types of arrays are also counted.  Any field with a type that is

either a supertype or a subtype of the class is not counted.

<a name="FANOUT"/>

<h3>Fan Out - FANOUT</h3>

FANOUT is defined for classes and interfaces, constructors and methods. It

counts the number of reference types that are used in:

<ul>

<li>field declarations;</li>

<li>formal parameters and return types;</li>

<li>throws declarations;</li>

<li>local variables.</li>

</ul>

The component types of arrays are also counted. Any type that is either a

supertype or a subtype of the class is not counted.

<a name="CBO"/>

<h3>Coupling Between Objects - CBO</h3>

When one object or class uses another object or class they are said to be

coupled. One major source of coupling is that between a superclass and a

subclass. A coupling is also introduced when a method or field in another

class is accessed, or when an object of another class is passed into or out

of a method invocation. Coupling Between Objects is a measure of the

non-inheritance coupling between two objects.

<p/>

A high value of coupling reduces the modularity of the class and makes

reuse more difficult. The more independent a class is the more likely it is

that it will be possible to reuse it in another part of the system. When a

class is coupled to another class it becomes sensitive to changes in that

class, thereby making maintenance for difficult. In addition, a class that is

overly dependent on other classes can be difficult to understand and test in

isolation.

<p/>

CBO is defined for classes and interfaces, constructors and methods. It

counts the number of reference types that are used in:

<ul>

<li>field declarations</li>

<li>formal parameters and return types</li>

<li>throws declarations</li>

<li>local variables</li>

</ul>

It also counts:

<ul>

<li>types from which field and method selections are made</li>

</ul>

The component types of arrays are also counted. Any type that is either a

supertype or a subtype of the class is not counted.

<a name="LCOM"/>

<h3>Lack of Cohesion Of Methods - LCOM</h3>

The cohesion of a class is the degree to which its methods are related to

each other. It is determined by examining the pattern of state variable

accesses within the set of methods. If all the methods access the same state

variables then they have high cohesion; if they access disjoint sets of

variables then the cohesion is low. An extreme example of low cohesion

would be if none of the methods accessed any of the state variables.

If a class exhibits low method cohesion it indicates that the design of the

class has probably been partitioned incorrectly, and could benefit by being

split into more classes with individually higher cohesion. On the other

hand, a high value of cohesion (a low lack of cohesion) implies that the

class is well designed. A cohesive class will tend to provide a high degree

of encapsulation, whereas a lack of cohesion decreases encapsulation and

increases complexity.

<p/>

Another form of cohesion that is useful for Java programs is cohesion

between nested and enclosing classes. A nested class that has very low

cohesion with its enclosing class would probably better designed as a peer

class rather than a nested class.

<p/>

LCOM is defined for classes. Operationally, LCOM takes each pair of

methods in the class and determines the set of fields they each access. If

they have disjoint sets of field accesses increase the count P by one. If they

share at least one field access then increase Q by one. After considering

each pair of methods,

LCOM = (P > Q) ? (P - Q) : 0

<p/>

Indirect access to fields via local methods can be considered by setting a

metric configuration parameter.

<a name="NOC"/>

<h3>Number Of Classes - NOC</h3>

The overall size of the system can be estimated by calculating the number

of classes it contains. A large system with more classes is more complex

than a smaller one because the number of potential interactions between

objects is higher. This reduces the comprehensibility of the system which

in turn makes it harder to test, debug and maintain.

<p/>

If the number of classes in the system can be projected during the initial

design phase of the project it can serve as a base for estimating the total

effort and cost of developing, debugging and maintaining the system.

<p/>

The NOC metric can also usefully be applied at the package and class level

as well as the total system.

<p/>

NOCL is defined for class and interfaces. It counts the number of classes or

interfaces that are declared. This is usually 1, but nested class declarations

will increase this number.

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      <h2><a href="overview-summary.html" target="classFrame">Home</a></h2>

      <h2>Packages</h2>

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    <h3>Summary</h3>

    <table class="log" border="0" cellpadding="5" cellspacing="2" width="100%">

    <tr>

      <th><a href="metrics-reference.html#V(G)">V(G)</a></th>

      <th><a href="metrics-reference.html#LOC">LOC</a></th>

      <th><a href="metrics-reference.html#DIT">DIT</a></th>

      <th><a href="metrics-reference.html#NOA">NOA</a></th>

      <th><a href="metrics-reference.html#NRM">NRM</a></th>

      <th><a href="metrics-reference.html#NLM">NLM</a></th>

      <th><a href="metrics-reference.html#WMC">WMC</a></th>

      <th><a href="metrics-reference.html#RFC">RFC</a></th>

      <th><a href="metrics-reference.html#DAC">DAC</a></th>

      <th><a href="metrics-reference.html#FANOUT">FANOUT</a></th>

      <th><a href="metrics-reference.html#CBO">CBO</a></th>

      <th><a href="metrics-reference.html#LCOM">LCOM</a></th>

      <th><a href="metrics-reference.html#NOCL">NOCL</a></th>

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    <td style="text-align: justify;">

    Note: Metrics evaluate the quality of software by analyzing the program source and quantifying

    various kind of complexity. Complexity is a common source of problems and defects in software.

    High complexity makes it more difficult to develop, understand, maintain, extend, test and debug

    a program.

    <p/>

    The primary use of metrics is to focus your attention on those parts of code that potentially are

    complexity hot spots. Once the complex areas your program have been uncovered, you can take remedial

    actions.

    For additional information about metrics and their meaning, please consult

    Metamata Metrics manual.

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    </tr>

    </table>

    <h3>Packages</h3>

    <table border="0" cellpadding="5" cellspacing="2" width="100%">

      <xsl:call-template name="all.metrics.header"/>

      <xsl:for-each select=".//package[not(@name = 'unnamed package')]">

        <xsl:sort select="@name" order="ascending"/>

        <xsl:apply-templates select="." mode="print.metrics"/>

      </xsl:for-each>

    </table>

    <!-- @bug there could some classes at this level (classes in unnamed package) -->

    <xsl:call-template name="pageFooter"/>

    </body>

    </html>

</xsl:template>

<xsl:template match="package" mode="package.summary">

  <HTML>

    <HEAD>

      <xsl:call-template name="create.stylesheet.link">

        <xsl:with-param name="package.name" select="@name"/>

      </xsl:call-template>

    </HEAD>

    <body onload="open('package-frame.html','classListFrame')">

      <xsl:call-template name="pageHeader"/>

      <!-- create an anchor to this package name -->

      <h3>Package <xsl:value-of select="@name"/></h3>

      <table class="log" border="0" cellpadding="5" cellspacing="2" width="100%">

        <xsl:call-template name="all.metrics.header"/>

        <xsl:apply-templates select="." mode="print.metrics"/>

      </table>

      <table border="0" width="100%">

      <tr>

      <td style="text-align: justify;">

      Note: Metrics evaluate the quality of software by analyzing the program source and quantifying

      various kind of complexity. Complexity is a common source of problems and defects in software.

      High complexity makes it more difficult to develop, understand, maintain, extend, test and debug

      a program.

      <p/>

      The primary use of metrics is to focus your attention on those parts of code that potentially are

      complexity hot spots. Once the complex areas your program have been uncovered, you can take remedial

      actions.

      For additional information about metrics and their meaning, please consult

      Metamata Metrics manual.

      </td>

      </tr>

      </table>

      <xsl:variable name="classes-in-package" select="$doctree/classes/class[@package = current()/@name]"/>

      <xsl:if test="count($classes-in-package) &gt; 0">

        <H3>Classes</H3>

        <table class="log" border="0" cellpadding="5" cellspacing="2" width="100%">

          <xsl:call-template name="all.metrics.header"/>

          <xsl:for-each select="$classes-in-package">

                <xsl:sort select="@name"/>

                <xsl:apply-templates select="." mode="print.metrics"/>

          </xsl:for-each>

        </table>

      </xsl:if>

      <xsl:call-template name="pageFooter"/>

    </body>

  </HTML>

</xsl:template>

<!--

    transform string like a.b.c to ../../../

    @param path the path to transform into a descending directory path

-->

<xsl:template name="path">

  <xsl:param name="path"/>

  <xsl:if test="contains($path,'.')">

    <xsl:text>../</xsl:text>

    <xsl:call-template name="path">

      <xsl:with-param name="path"><xsl:value-of select="substring-after($path,'.')"/></xsl:with-param>

    </xsl:call-template>

  </xsl:if>

  <xsl:if test="not(contains($path,'.')) and not($path = '')">

    <xsl:text>../</xsl:text>

  </xsl:if>

</xsl:template>

<!-- create the link to the stylesheet based on the package name -->

<xsl:template name="create.stylesheet.link">

  <xsl:param name="package.name"/>

  <LINK REL ="stylesheet" TYPE="text/css" TITLE="Style"><xsl:attribute name="href"><xsl:if test="not($package.name = 'unnamed package')"><xsl:call-template name="path"><xsl:with-param name="path" select="$package.name"/></xsl:call-template></xsl:if>stylesheet.css</xsl:attribute></LINK>

</xsl:template>

<!-- Page Header -->

<xsl:template name="pageHeader">

  <!-- jakarta logo -->

  <table border="0" cellpadding="0" cellspacing="0" width="100%">

  <tr>

    <td class="bannercell" rowspan="2">

      <a href="http://jakarta.apache.org/">

      <img src="http://jakarta.apache.org/images/jakarta-logo.gif" alt="http://jakarta.apache.org" align="left" border="0"/>

      </a>

    </td>

    <td style="text-align:right"><h2>Source Code Metrics</h2></td>

    </tr>

    <tr>

    <td style="text-align:right">Designed for use with <a href='http://www.webgain.com/products/quality_analyzer/'>Webgain QA/Metamata Metrics</a> and <a href='http://jakarta.apache.org'>Ant</a>.</td>

    </tr>

  </table>

  <hr size="1"/>

</xsl:template>

<!-- Page Footer -->

<xsl:template name="pageFooter">

</xsl:template>

<!-- class header -->

<xsl:template name="all.metrics.header">

  <tr>

    <th width="80%">Name</th>

    <th nowrap="nowrap">V(G)</th>

    <th>LOC</th>

    <th>DIT</th>

    <th>NOA</th>

    <th>NRM</th>

    <th>NLM</th>

    <th>WMC</th>

    <th>RFC</th>

    <th>DAC</th>

    <th>FANOUT</th>

    <th>CBO</th>

    <th>LCOM</th>

    <th>NOCL</th>

  </tr>

</xsl:template>

<!-- method header -->

<xsl:template name="method.metrics.header">

  <tr>

    <th width="80%">Name</th>

    <th nowrap="nowrap">V(G)</th>

    <th>LOC</th>

    <th>FANOUT</th>

    <th>CBO</th>

  </tr>

</xsl:template>

<!-- method information -->

<xsl:template match="method" mode="print.metrics">

  <tr>

    <xsl:call-template name="alternate-row"/>

    <td><xsl:apply-templates select="@name"/></td>

    <td><xsl:apply-templates select="@vg"/></td>

    <td><xsl:apply-templates select="@loc"/></td>

    <td><xsl:apply-templates select="@fanout"/></td>

    <td><xsl:apply-templates select="@cbo"/></td>

  </tr>

</xsl:template>

<!-- class information -->

<xsl:template match="class" mode="print.metrics">

  <tr>

    <xsl:call-template name="alternate-row"/>

    <td><a href="{@name}.html"><xsl:value-of select="@name"/></a></td>

    <td><xsl:apply-templates select="@vg"/></td>

    <td><xsl:apply-templates select="@loc"/></td>

    <td><xsl:apply-templates select="@dit"/></td>

    <td><xsl:apply-templates select="@noa"/></td>

    <td><xsl:apply-templates select="@nrm"/></td>

    <td><xsl:apply-templates select="@nlm"/></td>

    <td><xsl:apply-templates select="@wmc"/></td>

    <td><xsl:apply-templates select="@rfc"/></td>

    <td><xsl:apply-templates select="@dac"/></td>

    <td><xsl:apply-templates select="@fanout"/></td>

    <td><xsl:apply-templates select="@cbo"/></td>

    <td><xsl:apply-templates select="@lcom"/></td>

    <td><xsl:apply-templates select="@nocl"/></td>

  </tr>

</xsl:template>

<xsl:template match="file|package" mode="print.metrics">

  <tr>

    <xsl:call-template name="alternate-row"/>

    <td>

    <a href="{translate(@name,'.','/')}/package-summary.html" target="classFrame">

    <xsl:value-of select="@name"/>

    </a>

    </td>

    <td><xsl:apply-templates select="@vg"/></td>

    <td><xsl:apply-templates select="@loc"/></td>

    <td><xsl:apply-templates select="@dit"/></td>

    <td><xsl:apply-templates select="@noa"/></td>

    <td><xsl:apply-templates select="@nrm"/></td>

    <td><xsl:apply-templates select="@nlm"/></td>

    <td><xsl:apply-templates select="@wmc"/></td>

    <td><xsl:apply-templates select="@rfc"/></td>

    <td><xsl:apply-templates select="@dac"/></td>

    <td><xsl:apply-templates select="@fanout"/></td>

    <td><xsl:apply-templates select="@cbo"/></td>

    <td><xsl:apply-templates select="@lcom"/></td>

    <td><xsl:apply-templates select="@nocl"/></td>

  </tr>

</xsl:template>

<xsl:template match="metrics" mode="print.metrics">

  <tr>

    <xsl:call-template name="alternate-row"/>

      <!-- the global metrics is the top package metrics -->

    <td><xsl:apply-templates select="./package/@vg"/></td>

    <td><xsl:apply-templates select="./package/@loc"/></td>

    <td><xsl:apply-templates select="./package/@dit"/></td>

    <td><xsl:apply-templates select="./package/@noa"/></td>

    <td><xsl:apply-templates select="./package/@nrm"/></td>

    <td><xsl:apply-templates select="./package/@nlm"/></td>

    <td><xsl:apply-templates select="./package/@wmc"/></td>

    <td><xsl:apply-templates select="./package/@rfc"/></td>

    <td><xsl:apply-templates select="./package/@dac"/></td>

    <td><xsl:apply-templates select="./package/@fanout"/></td>

    <td><xsl:apply-templates select="./package/@cbo"/></td>

    <td><xsl:apply-templates select="./package/@lcom"/></td>

    <td><xsl:apply-templates select="./package/@nocl"/></td>

  </tr>

</xsl:template>

<!-- alternated row style -->

<xsl:template name="alternate-row">

<xsl:attribute name="class">

  <xsl:if test="position() mod 2 = 1">a</xsl:if>

  <xsl:if test="position() mod 2 = 0">b</xsl:if>

</xsl:attribute>

</xsl:template>

<!-- how to display the metrics with their max value -->

<!-- @todo the max values must be external to the xsl -->

  <xsl:template match="@vg">

    <xsl:call-template name="display-value">

      <xsl:with-param name="value" select="current()"/>

      <xsl:with-param name="max" select="$vg.max"/>

    </xsl:call-template>

  </xsl:template>

  <xsl:template match="@loc">

    <xsl:call-template name="display-value">

      <xsl:with-param name="value" select="current()"/>

      <xsl:with-param name="max" select="$loc.max"/>

    </xsl:call-template>

  </xsl:template>

  <xsl:template match="@dit">

    <xsl:call-template name="display-value">

      <xsl:with-param name="value" select="current()"/>

      <xsl:with-param name="max" select="$dit.max"/>

    </xsl:call-template>

  </xsl:template>

  <xsl:template match="@noa">

    <xsl:call-template name="display-value">

      <xsl:with-param name="value" select="current()"/>

      <xsl:with-param name="max" select="$noa.max"/>

    </xsl:call-template>

  </xsl:template>

  <xsl:template match="@nrm">

    <xsl:call-template name="display-value">

      <xsl:with-param name="value" select="current()"/>

      <xsl:with-param name="max" select="$nrm.max"/>

    </xsl:call-template>

  </xsl:template>

  <xsl:template match="@nlm">

    <xsl:call-template name="display-value">

      <xsl:with-param name="value" select="current()"/>

      <xsl:with-param name="max" select="$nlm.max"/>

    </xsl:call-template>

  </xsl:template>

  <xsl:template match="@wmc">

    <xsl:call-template name="display-value">

      <xsl:with-param name="value" select="current()"/>

      <xsl:with-param name="max" select="$wmc.max"/>

    </xsl:call-template>

  </xsl:template>

  <xsl:template match="@rfc">

    <xsl:call-template name="display-value">

      <xsl:with-param name="value" select="current()"/>

      <xsl:with-param name="max" select="$rfc.max"/>

    </xsl:call-template>

  </xsl:template>

  <xsl:template match="@dac">

    <xsl:call-template name="display-value">

      <xsl:with-param name="value" select="current()"/>

      <xsl:with-param name="max" select="$dac.max"/>

    </xsl:call-template>

  </xsl:template>

  <xsl:template match="@fanout">

    <xsl:call-template name="display-value">

      <xsl:with-param name="value" select="current()"/>

      <xsl:with-param name="max" select="$fanout.max"/>

    </xsl:call-template>

  </xsl:template>

  <xsl:template match="@cbo">

    <xsl:call-template name="display-value">

      <xsl:with-param name="value" select="current()"/>

      <xsl:with-param name="max" select="$cbo.max"/>

    </xsl:call-template>

  </xsl:template>

  <xsl:template match="@lcom">

    <xsl:call-template name="display-value">

      <xsl:with-param name="value" select="current()"/>

      <xsl:with-param name="max" select="$lcom.max"/>

    </xsl:call-template>

  </xsl:template>

  <xsl:template match="@nocl">

    <xsl:call-template name="display-value">

      <xsl:with-param name="value" select="current()"/>

      <xsl:with-param name="max" select="$nocl.max"/>

    </xsl:call-template>

  </xsl:template>

  <xsl:template name="display-value">

    <xsl:param name="value"/>

    <xsl:param name="max"/>

    <xsl:if test="$value > $max">

      <xsl:attribute name="class">Error</xsl:attribute>

    </xsl:if>

    <xsl:value-of select="$value"/>

  </xsl:template>

</xsl:stylesheet>