Package com.bazaarvoice.jolt
Class Chainr.ContextualTransformAdapter
- java.lang.Object
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- com.bazaarvoice.jolt.Chainr.ContextualTransformAdapter
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- All Implemented Interfaces:
ContextualTransform
,JoltTransform
- Enclosing class:
- Chainr
private static class Chainr.ContextualTransformAdapter extends java.lang.Object implements ContextualTransform
Adapt "normal" Transforms to look like ContextualTransforms, so that Chainr can just maintain a single list of "JoltTransforms" to run.
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Constructor Summary
Constructors Modifier Constructor Description private
ContextualTransformAdapter(Transform transform)
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description java.lang.Object
transform(java.lang.Object input, java.util.Map<java.lang.String,java.lang.Object> context)
Execute a transform on some input JSON with optionally provided "context" and return the result.
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Field Detail
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transform
private final Transform transform
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Constructor Detail
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ContextualTransformAdapter
private ContextualTransformAdapter(Transform transform)
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Method Detail
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transform
public java.lang.Object transform(java.lang.Object input, java.util.Map<java.lang.String,java.lang.Object> context)
Description copied from interface:ContextualTransform
Execute a transform on some input JSON with optionally provided "context" and return the result. The "context" allows transforms to tweak their behavior based upon criteria outside of the input JSON object. The canonical example for the need to have Transforms consider "context" is a Transform that creates urls based upon input data. Should it generate "http" or "https" urls? Most likely the input JSON data does not provide any guidance. This is what the "context" is for. It allows the consumer of the Transform to specialize itself based on data outside the scope of the input JSON. Without the "context" notion you would instead create a HttpUrlTransform and a HttpsUrlTransform. This creates problems when you want to used them as part of a larger Chainr Transform, as you would need to create two Chainrs that are almost the same. The number of Chainrs needed grows exponentially as you add other context sensitive transforms.- Specified by:
transform
in interfaceContextualTransform
- Parameters:
input
- the JSON object to transform in plain vanilla Jackson Mapstyle context
- information outside of the input JSON that needs to be taken into account when doing the transform- Returns:
- the results of the transformation
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