checkstyle.xml

<?xml version="1.0"?>
<!DOCTYPE module PUBLIC
    "-//Checkstyle//DTD Checkstyle Configuration 1.3//EN"
    "https://checkstyle.org/dtds/configuration_1_3.dtd">

<module name="Checker">
    <property name="severity" value="warning"/>

    <module name="TreeWalker">
        <!-- Complexity Checks -->
        <module name="CyclomaticComplexity">
            <property name="max" value="15"/>
            <property name="severity" value="warning"/>
        </module>
        <module name="NPathComplexity">
            <property name="max" value="200"/>
            <property name="severity" value="warning"/>
        </module>
        <module name="JavaNCSS">
            <property name="methodMaximum" value="50"/>
            <property name="classMaximum" value="500"/>
            <property name="severity" value="warning"/>
        </module>

        <!-- Size Checks -->
        <module name="MethodLength">
            <property name="max" value="100"/>
            <property name="tokens" value="METHOD_DEF"/>
            <property name="severity" value="warning"/>
        </module>
        <module name="ParameterNumber">
            <property name="max" value="7"/>
            <property name="severity" value="warning"/>
        </module>

        <!-- Nesting Depth -->
        <module name="NestedIfDepth">
            <property name="max" value="3"/>
            <property name="severity" value="warning"/>
        </module>
        <module name="NestedTryDepth">
            <property name="max" value="2"/>
            <property name="severity" value="warning"/>
        </module>

        <!-- Best Practices -->
        <module name="MagicNumber">
            <property name="severity" value="info"/>
            <property name="ignoreNumbers" value="-1, 0, 1, 2, 3, 4, 5, 10, 100, 1000"/>
            <property name="ignoreHashCodeMethod" value="true"/>
            <property name="ignoreAnnotation" value="true"/>
        </module>
        <module name="SimplifyBooleanExpression">
            <property name="severity" value="warning"/>
        </module>
        <module name="SimplifyBooleanReturn">
            <property name="severity" value="warning"/>
        </module>

        <!-- Suppressions for UI classes and tests -->
        <module name="SuppressionCommentFilter">
            <property name="offCommentFormat" value="CHECKSTYLE.OFF\: ([\w\|]+)"/>
            <property name="onCommentFormat" value="CHECKSTYLE.ON\: ([\w\|]+)"/>
            <property name="checkFormat" value="$1"/>
        </module>
    </module>

    <!-- File-based suppressions -->
    <module name="SuppressionFilter">
        <property name="file" value="checkstyle-suppressions.xml"/>
        <property name="optional" value="false"/>
    </module>
</module>