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org.springframework.data.mongodb.core.aggregation
Class ConditionalOperators
- java.lang.Object
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- org.springframework.data.mongodb.core.aggregation.ConditionalOperators
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public class ConditionalOperators extends Object
Gateway to conditional expressions that evaluate their argument expressions as booleans to a value.- Since:
- 1.10
- Author:
- Mark Paluch, Christoph Strobl
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Nested Class Summary
Nested Classes Modifier and Type Class and Description static classConditionalOperators.CondEncapsulates the aggregation framework$condoperator.static classConditionalOperators.ConditionalOperatorFactorystatic classConditionalOperators.IfNullEncapsulates the aggregation framework$ifNulloperator.static classConditionalOperators.SwitchAggregationExpressionfor$switch.
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Constructor Summary
Constructors Constructor and Description ConditionalOperators()
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Method Summary
All Methods Static Methods Concrete Methods Modifier and Type Method and Description static ConditionalOperators.IfNull.ThenBuilderifNull(AggregationExpression expression)Creates newAggregationExpressionthat evaluates an expression and returns the value of the expression if the expression evaluates to a non-null value.static ConditionalOperators.IfNull.ThenBuilderifNull(String fieldReference)Creates newAggregationExpressionthat evaluates an expression and returns the value of the expression if the expression evaluates to a non-null value.static ConditionalOperators.SwitchswitchCases(ConditionalOperators.Switch.CaseOperator... conditions)Creates newAggregationExpressionthat evaluates a series ofConditionalOperators.Switch.CaseOperatorexpressions.static ConditionalOperators.SwitchswitchCases(List<ConditionalOperators.Switch.CaseOperator> conditions)Creates newAggregationExpressionthat evaluates a series ofConditionalOperators.Switch.CaseOperatorexpressions.static ConditionalOperators.ConditionalOperatorFactorywhen(AggregationExpression expression)Take the value resulting from the given expression.static ConditionalOperators.ConditionalOperatorFactorywhen(CriteriaDefinition criteriaDefinition)Take the value resulting from the given criteriaDefinition.static ConditionalOperators.ConditionalOperatorFactorywhen(String fieldReference)Take the field referenced by given fieldReference.
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Method Detail
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when
public static ConditionalOperators.ConditionalOperatorFactory when(String fieldReference)
Take the field referenced by given fieldReference.- Parameters:
fieldReference- must not be null.- Returns:
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when
public static ConditionalOperators.ConditionalOperatorFactory when(AggregationExpression expression)
Take the value resulting from the given expression.- Parameters:
expression- must not be null.- Returns:
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when
public static ConditionalOperators.ConditionalOperatorFactory when(CriteriaDefinition criteriaDefinition)
Take the value resulting from the given criteriaDefinition.- Parameters:
criteriaDefinition- must not be null.- Returns:
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ifNull
public static ConditionalOperators.IfNull.ThenBuilder ifNull(String fieldReference)
Creates newAggregationExpressionthat evaluates an expression and returns the value of the expression if the expression evaluates to a non-null value. If the expression evaluates to a null value, including instances of undefined values or missing fields, returns the value of the replacement expression.- Parameters:
fieldReference- must not be null.- Returns:
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ifNull
public static ConditionalOperators.IfNull.ThenBuilder ifNull(AggregationExpression expression)
Creates newAggregationExpressionthat evaluates an expression and returns the value of the expression if the expression evaluates to a non-null value. If the expression evaluates to a null value, including instances of undefined values or missing fields, returns the value of the replacement expression.- Parameters:
expression- must not be null.- Returns:
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switchCases
public static ConditionalOperators.Switch switchCases(ConditionalOperators.Switch.CaseOperator... conditions)
Creates newAggregationExpressionthat evaluates a series ofConditionalOperators.Switch.CaseOperatorexpressions. When it finds an expression which evaluates to true,$switchexecutes a specified expression and breaks out of the control flow.- Parameters:
conditions- must not be null.- Returns:
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switchCases
public static ConditionalOperators.Switch switchCases(List<ConditionalOperators.Switch.CaseOperator> conditions)
Creates newAggregationExpressionthat evaluates a series ofConditionalOperators.Switch.CaseOperatorexpressions. When it finds an expression which evaluates to true,$switchexecutes a specified expression and breaks out of the control flow.- Parameters:
conditions- must not be null.- Returns:
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