Package com.intellij.codeInspection.util

Class LambdaGenerationUtil

java.lang.Object

com.intellij.codeInspection.util.LambdaGenerationUtil

public class LambdaGenerationUtil
extends java.lang.Object

Utility methods which are helpful to generate new lambda expressions in quick-fixes

Constructor Summary

Constructors

Constructor and Description
LambdaGenerationUtil()

Method Summary

Modifier and Type	Method and Description
static boolean	canBeUncheckedLambda(PsiElement lambdaCandidate) Tests the element (expression or statement) whether it could be converted to the body of lambda expression mapped to functional interface which SAM does not declare any checked exceptions.
static boolean	canBeUncheckedLambda(PsiElement lambdaCandidate, java.util.function.Predicate<? super PsiVariable> variableAllowedPredicate) Tests the element (expression or statement) whether it could be converted to the body of lambda expression mapped to functional interface which SAM does not declare any checked exceptions.

Methods inherited from class java.lang.Object

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

Constructor Detail

LambdaGenerationUtil

public LambdaGenerationUtil()

Method Detail

canBeUncheckedLambda

public static boolean canBeUncheckedLambda(PsiElement lambdaCandidate)

Tests the element (expression or statement) whether it could be converted to the body of lambda expression mapped to functional interface which SAM does not declare any checked exceptions. The following things are checked:

1. The expression should not throw checked exceptions

2. The expression should not refer any variables which are not effectively final

3. No control flow instructions inside which may jump out of the supplied lambdaCandidate

Parameters:

lambdaCandidate - an expression or statement to test

Returns:

true if this expression or statement can be converted to lambda

canBeUncheckedLambda

public static boolean canBeUncheckedLambda(PsiElement lambdaCandidate,
                                           java.util.function.Predicate<? super PsiVariable> variableAllowedPredicate)

Tests the element (expression or statement) whether it could be converted to the body of lambda expression mapped to functional interface which SAM does not declare any checked exceptions. The following things are checked:

1. The expression should not throw checked exceptions

2. The expression should not refer any variables which are not effectively final and not allowed by specified predicate

3. No control flow instructions inside which may jump out of the supplied lambdaCandidate

Parameters:

lambdaCandidate - an expression or statement to test

variableAllowedPredicate - a predicate which returns true if the variable is allowed to be present inside lambdaCandidate even if it's not effectively final (e.g. it will be replaced by something else when moved to lambda)

Returns:

true if this expression or statement can be converted to lambda