com.facebook.buck.core.select

Class Selector<T>

java.lang.Object

com.facebook.buck.core.select.Selector<T>

public class Selector<T>
extends Object

Keeps mapping of a single select expression. The keys of a mapping are SelectorKeys and the values can be of an arbitrary type.

Constructor Summary

Constructors

Constructor and Description
Selector(com.google.common.collect.ImmutableMap<SelectorKey,T> conditions, com.google.common.collect.ImmutableSet<SelectorKey> nullConditions, String noMatchMessage) Creates a new Selector with a custom error message for a situation when no conditions match.

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object o)
com.google.common.collect.ImmutableMap<SelectorKey,T>	getConditions()
T	getDefaultConditionValue() Returns the default value - value to use when none of the conditions match.
String	getNoMatchMessage() Returns a custom message that needs to be shown to a user when no condition matches.
com.google.common.collect.ImmutableSet<SelectorKey>	getNullConditions()
boolean	hasDefaultCondition() Returns whether or not this selector has a default condition.
int	hashCode()
<U,E extends Exception> Selector<U>	mapValuesThrowing(ThrowingFunction<T,U,E> function) Transform all items with given function.
static <T> Selector<T>	onlyDefault(T element)
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

Selector

public Selector(com.google.common.collect.ImmutableMap<SelectorKey,T> conditions,
                com.google.common.collect.ImmutableSet<SelectorKey> nullConditions,
                String noMatchMessage)

Creates a new Selector with a custom error message for a situation when no conditions match.

Method Detail

onlyDefault

public static <T> Selector<T> onlyDefault(T element)

getConditions

public com.google.common.collect.ImmutableMap<SelectorKey,T> getConditions()

getNullConditions

public com.google.common.collect.ImmutableSet<SelectorKey> getNullConditions()

getDefaultConditionValue

@Nullable
public T getDefaultConditionValue()

Returns the default value - value to use when none of the conditions match.

Returns:

the value provided in the default condition or null if it wasn't provided.

hasDefaultCondition

public boolean hasDefaultCondition()

Returns whether or not this selector has a default condition.

getNoMatchMessage

public String getNoMatchMessage()

Returns a custom message that needs to be shown to a user when no condition matches.

Returns:

the custom message or an empty string if the message is not declared.

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object

mapValuesThrowing

public <U,E extends Exception> Selector<U> mapValuesThrowing(ThrowingFunction<T,U,E> function)
                                                      throws E extends Exception

Transform all items with given function.

Throws:

E extends Exception