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See:
          Description
| Interface Summary | |
|---|---|
| AggregateListener | An aggregate listener aggregates data produced by an ExpressionQuery. | 
| Arguments | Multiple arguments to a function call. | 
| Constant | Interface for any query constant value. | 
| Expression | Interface for a set of conditions that must be met for the query to be true. | 
| ExpressionFactory | The ExpressionFactory must be implemented by a particular runtime
 to form Expressions in its native query language. | 
| ExpressionParser | Parser for query languages that will be used by a ExpressionQuery. | 
| ExpressionVisitor | Visits nodes of a query expression tree. | 
| FilterListener | A filter listener extends expression filters with custom functionality. | 
| Literal | Interface for any literal value. | 
| Parameter | A query parameter. | 
| Path | A path represents a traversal into fields of a candidate object. | 
| Resolver | A Resolver is used to resolve listeners and class or entity names that appear in a query. | 
| Subquery | Query value representing a subquery. | 
| Value | Interface for any non-operator in a query filter, including constants, variables, and object fields. | 
| Class Summary | |
|---|---|
| Abs | Take the absolute value of a number. | 
| AbstractExpressionBuilder | Abstract base class to help build expressions. | 
| AbstractExpressionVisitor | No-op abstract visitor meant for easy extension. | 
| Add | Value produced by two values being added together. | 
| Aggregate | A value produced from evaluating a result aggregate. | 
| AggregateVal | An aggregate of some value. | 
| All | In-memory All implementation. | 
| AndExpression | An expression that AND's two others together. | 
| Any | In-memory Any implementation. | 
| Args | A list of arguments to a multi-argument function. | 
| Avg | Average values. | 
| BindKeyVariableExpression | BindVariableExpressionfor map key sets. | 
| BindValueVariableExpression | BindVariableExpressionfor map value collections. | 
| BindVariableAndExpression | Any contains(var) expression must be followed by at least one AND clause using the variable 'var'. | 
| BindVariableExpression | Binds a variable to a collection. | 
| BoundVariable | Represents a bound variable. | 
| CandidatePath | A path represents a traversal into fields of a candidate object. | 
| Cast | Represents a cast. | 
| Coalesce | An in-memory representation of a coalesce expression | 
| CollectionParam | Represents a collection valued input parameter. | 
| CompareExpression | Expression that compares two others. | 
| Concat | Concatenate two strings together. | 
| ContainsExpression | Tests that a Collection contains a value. | 
| ContainsKeyExpression | Tests that a Map key set contains a value. | 
| ContainsValueExpression | Tests that a Map value collection contains a value. | 
| Context | JPQL / Criteria Query Context | 
| Count | Count non-null values. | 
| CurrentDate | Represents the current date. | 
| Distinct | A distinct set of the specified values. | 
| Divide | Value produced by one value being divided by another. | 
| EndsWithExpression | Expression that compares two others. | 
| EqualExpression | Expression that compares two others. | 
| Exp | An in-memory representation of an Expression. | 
| Extension | A value produced from evaluating a custom extension. | 
| GeneralCase | An in-memory representation of a general case expression | 
| GetMapValue | Returns the value of the specified key in a Map. | 
| GetObjectId | Get the oid of an object. | 
| GreaterThanEqualExpression | Expression that compares two others. | 
| GreaterThanExpression | Expression that compares two others. | 
| Index | Returns the index of a value within a collection/map. | 
| IndexOf | Find the index of one string within another. | 
| InMemoryExpressionFactory | Expression factory implementation that can be used to execute queries in memory. | 
| InstanceofExpression | Tests whether a value is an instance of a class. | 
| IsEmptyExpression | Expression to test for an empty Collection. | 
| LessThanEqualExpression | Expression that compares two others. | 
| LessThanExpression | Expression that compares two others. | 
| Lit | Represents a literal. | 
| MatchesExpression | Expression that compares two others. | 
| MathVal | Value produced by a mathematical operation on two values. | 
| Max | Find the max. | 
| Min | Find the min. | 
| Mod | Value produced by one value being mod'd by another. | 
| Multiply | Value produced by two values being multiplied together. | 
| NotEqualExpression | Expression that compares two others. | 
| NotExpression | An expression that NOT's another. | 
| Null | Represents the null constant. | 
| NullIf | An in-memory representation of a nullif expression | 
| OrExpression | An expression that OR's two others together. | 
| Param | Represents a parameter. | 
| QueryExpressions | Struct to hold the state of a parsed expression query. | 
| SimpleCase | An in-memory representation of a simple case expression | 
| Size | Returns the count of a collection. | 
| Sqrt | Take the square root of a number. | 
| StartsWithExpression | Expression that compares two others. | 
| StringContains | Deprecated. Use matches()instead. | 
| StringLength | Returns the number of characters in the String. | 
| SubQ | An in-memory representation of a Subquery. | 
| Substring | Take the substring of a string. | 
| Subtract | Value produced by one value being subtracted from another. | 
| Sum | Sum values. | 
| This | Represents the 'this' ptr in a filter. | 
| ToLowerCase | Lower-case a string. | 
| ToUpperCase | Upper-case a string. | 
| Trim | Trims leading, trailing, or both charactes from a String. | 
| Type | Returns the entity type. | 
| TypeLit | Represents a type literal. | 
| UnaryMathVal | Value produced by a mathematical operation on one value. | 
| UnboundVariable | Represents an unbound variable. | 
| Val | An in-memory representation of a Value. | 
| ValExpression | Boolean value used as an expression. | 
| ValuePath | Represents a path that begins with a variable or parameter. | 
| WhenCondition | |
| WhenScalar | |
| WildcardMatch | Deprecated. Use matches()instead. | 
OpenJPA Expression Tree
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