org.dalesbred.query

Interface VariableResolver

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
public interface VariableResolver

Resolves values for variables appearing in SQL queries with named parameters.

Method Summary

Modifier and Type	Method and Description
static @NotNull VariableResolver	forBean(@NotNull Object object) Returns a VariableResolver that is backed by given bean.
static @NotNull VariableResolver	forMap(@NotNull Map<String,?> variables) Returns a VariableResolver that is backed by given map.
@Nullable Object	getValue(@NotNull String variable) Returns the value of given variable, which could be null.

Method Detail

getValue

@Nullable
@Nullable Object getValue(@NotNull
                                    @NotNull String variable)

Returns the value of given variable, which could be null.

Throws:

VariableResolutionException - if resolution fails

forMap

@NotNull
static @NotNull VariableResolver forMap(@NotNull
                                                 @NotNull Map<String,?> variables)

Returns a VariableResolver that is backed by given map.

forBean

@NotNull
static @NotNull VariableResolver forBean(@NotNull
                                                  @NotNull Object object)

Returns a VariableResolver that is backed by given bean. When variables are looked up, tries to find a matching getter or accessible field for the variable and returns its value.