Package org.springframework.data.spel

Class ExpressionDependencies

java.lang.Object

org.springframework.data.spel.ExpressionDependencies

All Implemented Interfaces:

Iterable<ExpressionDependencies.ExpressionDependency>, Supplier<Stream<ExpressionDependencies.ExpressionDependency>>, Streamable<ExpressionDependencies.ExpressionDependency>

public class ExpressionDependencies
extends Object
implements Streamable<ExpressionDependencies.ExpressionDependency>

Value object capturing dependencies to a method or property/field that is referenced from a SpEL expression.

Since:

2.4

Author:

Mark Paluch, Christoph Strobl

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	ExpressionDependencies.ExpressionDependency	Value object to describe a dependency to a method or property/field that is referenced from a SpEL expression.

Method Summary

Modifier and Type	Method	Description
static ExpressionDependencies	discover(Expression expression)	Discover all expression dependencies that are referenced in the expression root.
static ExpressionDependencies	discover(SpelNode root, boolean topLevelOnly)	Discover all expression dependencies that are referenced in the expression root.
boolean	equals(Object o)
int	hashCode()
Iterator<ExpressionDependencies.ExpressionDependency>	iterator()
static ExpressionDependencies	merged(Iterable<ExpressionDependencies> dependencies)	Return an ExpressionDependencies object representing the merged collection of dependencies withing the given ExpressionDependencies collection.
ExpressionDependencies	mergeWith(ExpressionDependencies other)	Create new ExpressionDependencies that contains all dependencies from this object and other.
static ExpressionDependencies	none()	Return an empty ExpressionDependencies object.
static ExpressionDependencies	of(Collection<ExpressionDependencies.ExpressionDependency> dependencies)	Return an ExpressionDependencies object representing the given Collection of dependencies.

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Methods inherited from interface org.springframework.data.util.Streamable

and, and, and, and, filter, flatMap, get, isEmpty, map, stream, toList, toSet

Method Details

none

public static ExpressionDependencies none()

Return an empty ExpressionDependencies object.

Returns:

empty dependencies.

of

public static ExpressionDependencies of(Collection<ExpressionDependencies.ExpressionDependency> dependencies)

Return an ExpressionDependencies object representing the given Collection of dependencies.

Returns:

ExpressionDependencies holding the given dependencies or none if the collection is empty.

merged

public static ExpressionDependencies merged(Iterable<ExpressionDependencies> dependencies)

Return an ExpressionDependencies object representing the merged collection of dependencies withing the given ExpressionDependencies collection.

Returns:

ExpressionDependencies holding a set of merged dependencies or none if the given Iterable is empty.

discover

public static ExpressionDependencies discover(Expression expression)

Discover all expression dependencies that are referenced in the expression root.

Parameters:

expression - the SpEL expression to inspect.

Returns:

a set of ExpressionDependencies.

discover

public static ExpressionDependencies discover(SpelNode root,
 boolean topLevelOnly)

Discover all expression dependencies that are referenced in the expression root.

Parameters:

root - the SpEL expression to inspect.

topLevelOnly - whether to include top-level dependencies only. Top-level dependencies are dependencies that indicate the start of a compound expression and required to resolve the next expression item.

Returns:

a set of ExpressionDependencies.

mergeWith

public ExpressionDependencies mergeWith(ExpressionDependencies other)

Create new ExpressionDependencies that contains all dependencies from this object and other. The merged dependencies are guaranteed to not contain duplicates.

Parameters:

other - the other ExpressionDependencies object.

Returns:

new merged ExpressionDependencies object.

iterator

public Iterator<ExpressionDependencies.ExpressionDependency> iterator()

Specified by:

iterator in interface Iterable<ExpressionDependencies.ExpressionDependency>

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object