Suggestion for CriteriaBuilder

sfdx-source/apex-common/main/classes/fflib_BooleanOperator.cls

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+/**
+ * This enum represents the boolean operators used in the fflib_CriteriaBuilder class.
+ * It defines two operators: WITH_AND and WITH_OR.
+ */
+public enum fflib_BooleanOperator {
+
+    /**
+     * The boolean operator AND.
+     */
+    WITH_AND,
+
+    /**
+     * The boolean operator OR.
+     */
+    WITH_OR
+}

sfdx-source/apex-common/main/classes/fflib_BooleanOperator.cls-meta.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<ApexClass xmlns="http://soap.sforce.com/2006/04/metadata">
+    <apiVersion>57.0</apiVersion>
+    <status>Active</status>
+</ApexClass>

sfdx-source/apex-common/main/classes/fflib_ComparisonOperator.cls

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+/**
+ * This class defines the comparison operators used in the fflib_CriteriaBuilder class.
+ * It provides constants for various comparison operators and abstract methods for negation, inversion, broadening, and sharpening.
+ */
+public class fflib_ComparisonOperator {
+
+    /**
+     * The equal operator.
+     */
+    public static final String EQUAL = ' = ';
+
+    /**
+     * The not equal operator.
+     */
+    public static final String NOT_EQUAL = ' != ';
+
+    /**
+     * The less than operator.
+     */
+    public static final String LESS_THAN = ' < ';
+
+    /**
+     * The less than or equal operator.
+     */
+    public static final String LESS_THAN_OR_EQUAL = ' <= ';
+
+    /**
+     * The greater than operator.
+     */
+    public static final String GREATER_THAN = ' > ';
+
+    /**
+     * The greater than or equal operator.
+     */
+    public static final String GREATER_THAN_OR_EQUAL = ' >= ';
+
+    /**
+     * The 'IN' operator.
+     */
+    public static final String IS_IN = ' IN ';
+
+    /**
+     * The 'NOT IN' operator.
+     */
+    public static final String NOT_IN = ' NOT IN ';
+
+    /**
+     * The 'LIKE' operator.
+     */
+    public static final String IS_LIKE = ' LIKE ';
+
+    /**
+     * The 'NOT LIKE' operator.
+     */
+    public static final String NOT_LIKE = ' NOT LIKE ';
+
+    /**
+     * Negates the comparison operator.
+     *
+     * @return the negated comparison operator
+     */
+    //public abstract ComparisonOperator negated();
+
+    /**
+     * Inverts the comparison operator.
+     *
+     * @return the inverted comparison operator
+     */
+    //public abstract ComparisonOperator invert();
+
+    /**
+     * Broadens the comparison operator.
+     *
+     * @return the broadened comparison operator
+     */
+    //public abstract ComparisonOperator broader();
+
+    /**
+     * Sharpens the comparison operator.
+     *
+     * @return the sharpened comparison operator
+     */
+    //public abstract ComparisonOperator sharper();
+
+    /**
+     * Returns the SQL text representation of the comparison operator.
+     *
+     * @return the SQL text representation
+     */
+    //public abstract String sqlText();
+}

sfdx-source/apex-common/main/classes/fflib_ComparisonOperator.cls-meta.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ApexClass xmlns="http://soap.sforce.com/2006/04/metadata">
+    <apiVersion>57.0</apiVersion>
+    <status>Active</status>
+</ApexClass>