Class VariableMappingTransformer
java.lang.Object
io.camunda.zeebe.engine.processing.deployment.model.transformer.VariableMappingTransformer
Transform variable mappings into an expression.
The resulting expression is a FEEL context that has a similar structure as a JSON document. Each target of a mapping is a key in the context and the source of this mapping is the context value. The source expression can be any FEEL expression. A nested target expression is transformed into a nested context.
Variable mappings:
source | target =======|======= x | a y | b.c z | b.dFEEL context expression:
{ a: x, b: { c: y, d: z } }
Output variable mappings differ from input mappings that the result variables needs to be merged with the existing variables if the variable is a JSON object. The merging is done by calling the FEEL function 'context merge()' and referencing the variable.
{ a: x, b: if (b = null) then { c: y, d: z } else context merge(b, { c: y, d: z }) }
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Constructor Summary
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Method Summary
Modifier and TypeMethodDescriptionio.camunda.zeebe.el.Expression
transformInputMappings
(Collection<? extends ZeebeMapping> inputMappings, io.camunda.zeebe.el.ExpressionLanguage expressionLanguage) io.camunda.zeebe.el.Expression
transformOutputMappings
(Collection<? extends ZeebeMapping> outputMappings, io.camunda.zeebe.el.ExpressionLanguage expressionLanguage)
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Constructor Details
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VariableMappingTransformer
public VariableMappingTransformer()
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Method Details
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transformInputMappings
public io.camunda.zeebe.el.Expression transformInputMappings(Collection<? extends ZeebeMapping> inputMappings, io.camunda.zeebe.el.ExpressionLanguage expressionLanguage) -
transformOutputMappings
public io.camunda.zeebe.el.Expression transformOutputMappings(Collection<? extends ZeebeMapping> outputMappings, io.camunda.zeebe.el.ExpressionLanguage expressionLanguage)
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