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25 changes: 25 additions & 0 deletions
25
error-prone-contrib/src/main/java/tech/picnic/errorprone/bugpatterns/util/Flags.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,25 @@ | ||
| package tech.picnic.errorprone.bugpatterns.util; | ||
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| import com.google.common.collect.ImmutableList; | ||
| import com.google.errorprone.ErrorProneFlags; | ||
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| /** Helper methods for working with {@link ErrorProneFlags}. */ | ||
| public final class Flags { | ||
| private Flags() {} | ||
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| /** | ||
| * Returns the list of (comma-separated) arguments passed using the given Error Prone flag. | ||
| * | ||
| * @param errorProneFlags The full set of flags provided. | ||
| * @param name The name of the flag of interest. | ||
| * @return A non-{@code null} list of provided arguments; this list is empty if the flag was not | ||
| * provided, or if the flag's value is the empty string. | ||
| */ | ||
| public static ImmutableList<String> getList(ErrorProneFlags errorProneFlags, String name) { | ||
| return errorProneFlags | ||
| .getList(name) | ||
| .map(ImmutableList::copyOf) | ||
| .filter(flags -> !flags.equals(ImmutableList.of(""))) | ||
| .orElseGet(ImmutableList::of); | ||
| } | ||
| } |
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31 changes: 31 additions & 0 deletions
31
error-prone-contrib/src/test/java/tech/picnic/errorprone/bugpatterns/util/FlagsTest.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,31 @@ | ||
| package tech.picnic.errorprone.bugpatterns.util; | ||
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| import static org.assertj.core.api.Assertions.assertThat; | ||
| import static org.junit.jupiter.params.provider.Arguments.arguments; | ||
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| import com.google.common.collect.ImmutableList; | ||
| import com.google.errorprone.ErrorProneOptions; | ||
| import java.util.stream.Stream; | ||
| import org.junit.jupiter.params.ParameterizedTest; | ||
| import org.junit.jupiter.params.provider.Arguments; | ||
| import org.junit.jupiter.params.provider.MethodSource; | ||
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| final class FlagsTest { | ||
| private static Stream<Arguments> getListTestCases() { | ||
| /* { args, flag, expected } */ | ||
| return Stream.of( | ||
| arguments(ImmutableList.of(), "Foo", ImmutableList.of()), | ||
| arguments(ImmutableList.of("-XepOpt:Foo=bar,baz"), "Qux", ImmutableList.of()), | ||
| arguments(ImmutableList.of("-XepOpt:Foo="), "Foo", ImmutableList.of()), | ||
| arguments(ImmutableList.of("-XepOpt:Foo=bar"), "Foo", ImmutableList.of("bar")), | ||
| arguments(ImmutableList.of("-XepOpt:Foo=bar,baz"), "Foo", ImmutableList.of("bar", "baz")), | ||
| arguments(ImmutableList.of("-XepOpt:Foo=,"), "Foo", ImmutableList.of("", ""))); | ||
| } | ||
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| @MethodSource("getListTestCases") | ||
| @ParameterizedTest | ||
| void getList(ImmutableList<String> args, String flag, ImmutableList<String> expected) { | ||
| assertThat(Flags.getList(ErrorProneOptions.processArgs(args).getFlags(), flag)) | ||
| .containsExactlyElementsOf(expected); | ||
| } | ||
| } |