VariableResolver (Solr 8.1.0 API)

java.lang.Object
- org.apache.solr.handler.dataimport.VariableResolver

```
public class VariableResolver
extends Object
```
A set of nested maps that can resolve variables by namespaces. Variables are enclosed with a dollar sign then an opening curly brace, ending with a closing curly brace. Namespaces are delimited with '.' (period).

This class also has special logic to resolve evaluator calls by recognizing the reserved function namespace: dataimporter.functions.xxx

This class caches strings that have already been resolved from the current dih import.
This API is experimental and may change in the future.

Since:

solr 1.3

Field Summary

Fields
Modifier and Type Field Description

static String FUNCTIONS_NAMESPACE

static String FUNCTIONS_NAMESPACE_SHORT

Constructor Summary

Constructors
Constructor Description

VariableResolver()

VariableResolver(Map<String,Object> defaults)

VariableResolver(Properties defaults)

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`addNamespace(String name, Map<String,Object> newMap)`
`List<String>`	`getVariables(String expr)`
`void`	`removeNamespace(String name)`
`String`	`replaceTokens(String template)`	Given a String with place holders, replace them with the value tokens.
`Object`	`resolve(String name)`	Resolves a given value with a name
`void`	`setEvaluators(Map<String,Evaluator> evaluators)`

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail
- FUNCTIONS_NAMESPACE
```
public static final String FUNCTIONS_NAMESPACE
```
  See Also:
  
  Constant Field Values
- FUNCTIONS_NAMESPACE_SHORT
```
public static final String FUNCTIONS_NAMESPACE_SHORT
```
  See Also:
  
  Constant Field Values

Constructor Detail

VariableResolver
```
public VariableResolver()
```

VariableResolver

public VariableResolver(Properties defaults)

VariableResolver

public VariableResolver(Map<String,Object> defaults)

Method Detail

resolve
```
public Object resolve(String name)
```
Resolves a given value with a name

Parameters:

name - the String to be resolved

Returns:

an Object which is the result of evaluation of given name

replaceTokens
```
public String replaceTokens(String template)
```
Given a String with place holders, replace them with the value tokens.

Returns:

the string with the placeholders replaced with their values

addNamespace

public void addNamespace(String name,
                         Map<String,Object> newMap)

getVariables

public List<String> getVariables(String expr)

removeNamespace

public void removeNamespace(String name)

setEvaluators

public void setEvaluators(Map<String,Evaluator> evaluators)