org.apache.solr.handler.dataimport

Class VariableResolver

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 and Description
static String	FUNCTIONS_NAMESPACE
static String	FUNCTIONS_NAMESPACE_SHORT

Constructor Summary

Constructors

Constructor and Description
VariableResolver()
VariableResolver(Map<String,Object> defaults)
VariableResolver(Properties defaults)

Method Summary

Methods

Modifier and Type	Method and Description
void	addNamespace(String name, Map<String,Object> newMap)
List<String>	getVariables(String template) Get a list of variables embedded in the template string.
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

getVariables

public List<String> getVariables(String template)

Get a list of variables embedded in the template string.

addNamespace

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

removeNamespace

public void removeNamespace(String name)

setEvaluators

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