com.sap.cloud.sdk.s4hana.datamodel.odata.helper

Class ExpressionFluentHelper<EntityT>

java.lang.Object

com.sap.cloud.sdk.s4hana.datamodel.odata.helper.ExpressionFluentHelper<EntityT>

Type Parameters:

EntityT - VdmObject that the expression is operating on.

public class ExpressionFluentHelper<EntityT>
extends Object

Template class that represents query expressions. Instances of this object are used in query modifier methods of the entity fluent helpers. Use either the expression methods from EntityField instances, or the logical operators and and or as methods in this class. Negation can be achieved by not. Every logical operator creates and returns a new instance based on the original expression object. Instantiating objects from this class directly can cause undefined results.

See Also:

not(ExpressionFluentHelper)

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	ExpressionFluentHelper(FilterExpressionWrapper<?> expression)

Method Summary

Modifier and Type	Method and Description
ExpressionFluentHelper<EntityT>	and(ExpressionFluentHelper<EntityT> conjunctExpression) Boolean AND expression fluent helper.
protected boolean	canEqual(Object other)
boolean	equals(Object o)
List<com.sap.cloud.sdk.s4hana.datamodel.odata.helper.ExpressionFluentHelper.LogicPair>	getChain()
FilterExpressionWrapper<?>	getExpression()
int	hashCode()
boolean	isNegateOperator()
ExpressionFluentHelper<EntityT>	not() Boolean NOT expression fluent helper.
static <T> ExpressionFluentHelper<T>	not(ExpressionFluentHelper<T> expression) Boolean NOT expression fluent helper.
ExpressionFluentHelper<EntityT>	or(ExpressionFluentHelper<EntityT> disjunctExpression) Boolean OR expression fluent helper.
String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

ExpressionFluentHelper

protected ExpressionFluentHelper(FilterExpressionWrapper<?> expression)

Method Detail

or

public ExpressionFluentHelper<EntityT> or(ExpressionFluentHelper<EntityT> disjunctExpression)

Boolean OR expression fluent helper.

Please note:
Filter expressions chained together by logical operators are interpreted in the same order as their corresponding methods are called. Since the Java language evaluates method calls from left to right, the fluent API design is following the same principle. The implicit precedence is following the method invocation and not the underlying, logical operators:

 A.or(B).and(C) <=> (A.or(B)).and(C)

 

Recommendation:
Incorporate parentheses or introduce variables to reflect combined expressions:

 var AorB = A.or(B)

 AorB.and(C)

 

Parameters:

disjunctExpression - Other expression to combine with.

Returns:

Fluent helper that represents a ((this) || other) expression.

and

public ExpressionFluentHelper<EntityT> and(ExpressionFluentHelper<EntityT> conjunctExpression)

Boolean AND expression fluent helper.

Please note:
Filter expressions chained together by logical operators are interpreted in the same order as their corresponding methods are called. Since the Java language evaluates method calls from left to right, the fluent API design is following the same principle. The implicit precedence is following the method invocation and not the underlying, logical operators:

 A.or(B).and(C) <=> (A.or(B)).and(C)

 

Recommendation:
Incorporate parentheses or introduce variables to reflect combined expressions:

 var AorB = A.or(B)

 AorB.and(C)

 

Parameters:

conjunctExpression - Other expression to combine with.

Returns:

Fluent helper that represents a ((this) && other) expression.

not

public ExpressionFluentHelper<EntityT> not()

Boolean NOT expression fluent helper.

Returns:

Fluent helper that represents a not(this) expression.

not

public static <T> ExpressionFluentHelper<T> not(ExpressionFluentHelper<T> expression)

Boolean NOT expression fluent helper.

Parameters:

expression - expression to be negated.

Returns:

Fluent helper that represents a not(expression) expression.

toString

public String toString()

Overrides:

toString in class Object

equals

public boolean equals(Object o)

Overrides:

equals in class Object

canEqual

protected boolean canEqual(Object other)

hashCode

public int hashCode()

Overrides:

hashCode in class Object

getChain

public List<com.sap.cloud.sdk.s4hana.datamodel.odata.helper.ExpressionFluentHelper.LogicPair> getChain()

getExpression

public FilterExpressionWrapper<?> getExpression()

isNegateOperator

public boolean isNegateOperator()