org.apache.nifi.attribute.expression.language

Class Query

java.lang.Object

org.apache.nifi.attribute.expression.language.Query

public class Query
extends Object

Class used for creating and evaluating NiFi Expression Language. Once a Query has been created, it may be evaluated using the evaluate methods exactly once.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	Query.Range

Field Summary

Fields

Modifier and Type	Field and Description
private AtomicBoolean	evaluated
private Evaluator<?>	evaluator
private String	query
private org.antlr.runtime.tree.Tree	tree

Constructor Summary

Constructors

Modifier	Constructor and Description
private	Query(String query, org.antlr.runtime.tree.Tree tree, Evaluator<?> evaluator)

Method Summary

Methods

Modifier and Type	Method and Description
private static Evaluator<Boolean>	buildBooleanEvaluator(org.antlr.runtime.tree.Tree tree)
private static Evaluator<?>	buildEvaluator(org.antlr.runtime.tree.Tree tree)
private static Evaluator<?>	buildExpressionEvaluator(org.antlr.runtime.tree.Tree tree)
private static Evaluator<?>	buildFunctionEvaluator(org.antlr.runtime.tree.Tree tree, Evaluator<?> subjectEvaluator, List<Evaluator<?>> argEvaluators)
private static Evaluator<?>	buildFunctionExpressionEvaluator(org.antlr.runtime.tree.Tree tree, int offset)
static Query	compile(String query)
static org.antlr.runtime.tree.Tree	compileTree(String query)
(package private) static Map<String,String>	createExpressionMap(FlowFile flowFile)
private static org.antlr.runtime.CommonTokenStream	createTokenStream(String expression)
(package private) QueryResult<?>	evaluate()
(package private) QueryResult<?>	evaluate(FlowFile flowFile)
(package private) QueryResult<?>	evaluate(Map<String,String> attributes)
(package private) static String	evaluateExpression(org.antlr.runtime.tree.Tree tree, String queryText, Map<String,String> expressionMap, AttributeValueDecorator decorator)
(package private) static String	evaluateExpressions(String rawValue)
(package private) static String	evaluateExpressions(String rawValue, FlowFile flowFile)
static String	evaluateExpressions(String rawValue, FlowFile flowFile, AttributeValueDecorator decorator)
(package private) static String	evaluateExpressions(String rawValue, Map<String,String> expressionMap)
(package private) static String	evaluateExpressions(String rawValue, Map<String,String> expressionMap, AttributeValueDecorator decorator)
static List<Query.Range>	extractExpressionRanges(String value)
static List<String>	extractExpressions(String value)
static List<AttributeExpression.ResultType>	extractResultTypes(String value)
(package private) static int	findEndQuoteChar(String value, int quoteStart)
static Query	fromTree(org.antlr.runtime.tree.Tree tree, String text)
AttributeExpression.ResultType	getResultType()
static AttributeExpression.ResultType	getResultType(String value)
private static Evaluator<?>	getRootSubjectEvaluator(Evaluator<?> evaluator)
(package private) org.antlr.runtime.tree.Tree	getTree()
static boolean	isValidExpression(String value)
private static StringEvaluator	newStringLiteralEvaluator(String literalValue)
static PreparedQuery	prepare(String query)
private static BooleanEvaluator	toBooleanEvaluator(Evaluator<?> evaluator)
private static BooleanEvaluator	toBooleanEvaluator(Evaluator<?> evaluator, String location)
private static DateEvaluator	toDateEvaluator(Evaluator<?> evaluator)
private static DateEvaluator	toDateEvaluator(Evaluator<?> evaluator, String location)
private static NumberEvaluator	toNumberEvaluator(Evaluator<?> evaluator)
private static NumberEvaluator	toNumberEvaluator(Evaluator<?> evaluator, String location)
String	toString()
private static StringEvaluator	toStringEvaluator(Evaluator<?> evaluator)
private static StringEvaluator	toStringEvaluator(Evaluator<?> evaluator, String location)
static String	unescape(String value) Un-escapes ${...} patterns that were escaped
static void	validateExpression(String value, boolean allowSurroundingCharacters)
private static List<Evaluator<?>>	verifyArgCount(List<Evaluator<?>> args, int count, String functionName)
private static void	verifyMappingEvaluatorReduced(Evaluator<?> evaluator)
private static Map<String,String>	wrap(Map<String,String> attributes, Map<String,String> flowFileProps, Map<String,String> env, Map<?,?> sysProps)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

query

private final String query

tree

private final org.antlr.runtime.tree.Tree tree

evaluator

private final Evaluator<?> evaluator

evaluated

private final AtomicBoolean evaluated

Constructor Detail

Query

private Query(String query,
     org.antlr.runtime.tree.Tree tree,
     Evaluator<?> evaluator)

Method Detail

isValidExpression

public static boolean isValidExpression(String value)

getResultType

public static AttributeExpression.ResultType getResultType(String value)
                                                    throws AttributeExpressionLanguageParsingException

Throws:

AttributeExpressionLanguageParsingException

extractResultTypes

public static List<AttributeExpression.ResultType> extractResultTypes(String value)
                                                               throws AttributeExpressionLanguageParsingException

Throws:

AttributeExpressionLanguageParsingException

extractExpressions

public static List<String> extractExpressions(String value)
                                       throws AttributeExpressionLanguageParsingException

Throws:

AttributeExpressionLanguageParsingException

extractExpressionRanges

public static List<Query.Range> extractExpressionRanges(String value)
                                                 throws AttributeExpressionLanguageParsingException

Throws:

AttributeExpressionLanguageParsingException

validateExpression

public static void validateExpression(String value,
                      boolean allowSurroundingCharacters)
                               throws AttributeExpressionLanguageParsingException

Parameters:

value -

allowSurroundingCharacters -

Throws:

AttributeExpressionLanguageParsingException

findEndQuoteChar

static int findEndQuoteChar(String value,
                   int quoteStart)

evaluateExpression

static String evaluateExpression(org.antlr.runtime.tree.Tree tree,
                        String queryText,
                        Map<String,String> expressionMap,
                        AttributeValueDecorator decorator)
                          throws ProcessException

Throws:

ProcessException

evaluateExpressions

static String evaluateExpressions(String rawValue,
                         Map<String,String> expressionMap)
                           throws ProcessException

Throws:

ProcessException

evaluateExpressions

static String evaluateExpressions(String rawValue)
                           throws ProcessException

Throws:

ProcessException

evaluateExpressions

static String evaluateExpressions(String rawValue,
                         FlowFile flowFile)
                           throws ProcessException

Throws:

ProcessException

evaluateExpressions

static String evaluateExpressions(String rawValue,
                         Map<String,String> expressionMap,
                         AttributeValueDecorator decorator)
                           throws ProcessException

Throws:

ProcessException

evaluateExpressions

public static String evaluateExpressions(String rawValue,
                         FlowFile flowFile,
                         AttributeValueDecorator decorator)
                                  throws ProcessException

Throws:

ProcessException

getRootSubjectEvaluator

private static Evaluator<?> getRootSubjectEvaluator(Evaluator<?> evaluator)

unescape

public static String unescape(String value)

Un-escapes ${...} patterns that were escaped

Parameters:

value -

Returns:

createExpressionMap

static Map<String,String> createExpressionMap(FlowFile flowFile)

wrap

private static Map<String,String> wrap(Map<String,String> attributes,
                      Map<String,String> flowFileProps,
                      Map<String,String> env,
                      Map<?,?> sysProps)

fromTree

public static Query fromTree(org.antlr.runtime.tree.Tree tree,
             String text)

compileTree

public static org.antlr.runtime.tree.Tree compileTree(String query)
                                               throws AttributeExpressionLanguageParsingException

Throws:

AttributeExpressionLanguageParsingException

prepare

public static PreparedQuery prepare(String query)
                             throws AttributeExpressionLanguageParsingException

Throws:

AttributeExpressionLanguageParsingException

compile

public static Query compile(String query)
                     throws AttributeExpressionLanguageParsingException

Throws:

AttributeExpressionLanguageParsingException

verifyMappingEvaluatorReduced

private static void verifyMappingEvaluatorReduced(Evaluator<?> evaluator)

createTokenStream

private static org.antlr.runtime.CommonTokenStream createTokenStream(String expression)
                                                              throws AttributeExpressionLanguageParsingException

Throws:

AttributeExpressionLanguageParsingException

getResultType

public AttributeExpression.ResultType getResultType()

evaluate

QueryResult<?> evaluate()

evaluate

QueryResult<?> evaluate(FlowFile flowFile)

evaluate

QueryResult<?> evaluate(Map<String,String> attributes)

getTree

org.antlr.runtime.tree.Tree getTree()

toString

public String toString()

Overrides:

toString in class Object

newStringLiteralEvaluator

private static StringEvaluator newStringLiteralEvaluator(String literalValue)

buildEvaluator

private static Evaluator<?> buildEvaluator(org.antlr.runtime.tree.Tree tree)

buildBooleanEvaluator

private static Evaluator<Boolean> buildBooleanEvaluator(org.antlr.runtime.tree.Tree tree)

buildExpressionEvaluator

private static Evaluator<?> buildExpressionEvaluator(org.antlr.runtime.tree.Tree tree)

buildFunctionExpressionEvaluator

private static Evaluator<?> buildFunctionExpressionEvaluator(org.antlr.runtime.tree.Tree tree,
                                            int offset)

verifyArgCount

private static List<Evaluator<?>> verifyArgCount(List<Evaluator<?>> args,
                                int count,
                                String functionName)

toStringEvaluator

private static StringEvaluator toStringEvaluator(Evaluator<?> evaluator)

toStringEvaluator

private static StringEvaluator toStringEvaluator(Evaluator<?> evaluator,
                                String location)

toBooleanEvaluator

private static BooleanEvaluator toBooleanEvaluator(Evaluator<?> evaluator,
                                  String location)

toBooleanEvaluator

private static BooleanEvaluator toBooleanEvaluator(Evaluator<?> evaluator)

toNumberEvaluator

private static NumberEvaluator toNumberEvaluator(Evaluator<?> evaluator)

toNumberEvaluator

private static NumberEvaluator toNumberEvaluator(Evaluator<?> evaluator,
                                String location)

toDateEvaluator

private static DateEvaluator toDateEvaluator(Evaluator<?> evaluator)

toDateEvaluator

private static DateEvaluator toDateEvaluator(Evaluator<?> evaluator,
                            String location)

buildFunctionEvaluator

private static Evaluator<?> buildFunctionEvaluator(org.antlr.runtime.tree.Tree tree,
                                  Evaluator<?> subjectEvaluator,
                                  List<Evaluator<?>> argEvaluators)