com.netflix.spectator.impl

Interface PatternExpr

All Known Implementing Classes:

PatternExpr.And, PatternExpr.Not, PatternExpr.Or, PatternExpr.Regex

public interface PatternExpr

Represents an expression of simpler patterns combined with AND, OR, and NOT clauses. This can be used for rewriting complex regular expressions to simpler patterns for data stores that either support a more limited set of pattern or have better optimizations in place for simpler operations like starts with or contains.

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static class	PatternExpr.And
static interface	PatternExpr.Encoder Encoder to map a pattern expression to an expression for some other language.
static class	PatternExpr.Not
static class	PatternExpr.Or
static class	PatternExpr.Regex

Method Summary

Modifier and Type	Method and Description
static PatternExpr	and(List<PatternExpr> exprs) An expression that performs a logical AND of the listed sub-expressions.
default void	buildQueryString(PatternExpr.Encoder encoder, StringBuilder builder) Convert this expression into a query string.
boolean	matches(String value) Returns true if the expression matches the value.
static PatternExpr	not(PatternExpr expr) An expression that inverts the match of the sub-expression.
static PatternExpr	or(List<PatternExpr> exprs) An expression that performs a logical OR of the listed sub-expressions.
static PatternExpr	simple(PatternMatcher matcher) A simple expression that performs a single pattern match.
default String	toQueryString(PatternExpr.Encoder encoder) Convert this expression into a query string.

Method Detail

matches

boolean matches(String value)

Returns true if the expression matches the value. This is a helper mostly used for testing to ensure the matching logic is consistent with the original regular expression.

toQueryString

default String toQueryString(PatternExpr.Encoder encoder)

Convert this expression into a query string. A common example would be to implement an encoder that would convert it into part of a WHERE clause for a SQL DB.

buildQueryString

default void buildQueryString(PatternExpr.Encoder encoder,
                              StringBuilder builder)

Convert this expression into a query string. A common example would be to implement an encoder that would convert it into part of a WHERE clause for a SQL DB.

simple

static PatternExpr simple(PatternMatcher matcher)

A simple expression that performs a single pattern match.

and

static PatternExpr and(List<PatternExpr> exprs)

An expression that performs a logical AND of the listed sub-expressions.

or

static PatternExpr or(List<PatternExpr> exprs)

An expression that performs a logical OR of the listed sub-expressions.

not

static PatternExpr not(PatternExpr expr)

An expression that inverts the match of the sub-expression.