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Allow use of EnumSets #320

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16 changes: 15 additions & 1 deletion owner/src/main/java/org/aeonbits/owner/Converters.java
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Original file line number Diff line number Diff line change
Expand Up @@ -64,13 +64,19 @@ Object tryConvert(Method targetMethod, Class<?> targetType, String text) {
},

COLLECTION {
@SuppressWarnings("unchecked")
@Override
Object tryConvert(Method targetMethod, Class<?> targetType, String text) {
if (!Collection.class.isAssignableFrom(targetType)) return SKIP;

Object[] array = convertToArray(targetMethod, text);
Collection<Object> collection = Arrays.asList(array);
Collection<Object> result = instantiateCollection(targetType);
Collection<Object> result;
if (getGenericType(targetMethod).isEnum() && targetType.equals(EnumSet.class)) {
result = (Collection<Object>) instantiateEnumSet((Class<? extends Enum>) getGenericType(targetMethod));
} else {
result = instantiateCollection(targetType);
}
result.addAll(collection);
return result;
}
Expand Down Expand Up @@ -105,6 +111,14 @@ private <T> Collection<T> instantiateCollectionFromClass(Class<? extends T> targ
}
}

private <E extends Enum<E>> Collection<?> instantiateEnumSet(Class<E> targetType) {
try {
return EnumSet.noneOf(targetType);
} catch (Exception e) {
throw unsupported(e, "Cannot instantiate enumset of type '%s'", targetType.getCanonicalName());
}
}

private <T> Collection<T> instantiateCollectionFromInterface(Class<? extends T> targetType) {
if (List.class.isAssignableFrom(targetType))
return new ArrayList<T>();
Expand Down
24 changes: 14 additions & 10 deletions owner/src/test/java/org/aeonbits/owner/typeconversion/collections/CollectionSupportTest.java
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Original file line number Diff line number Diff line change
Expand Up @@ -13,20 +13,12 @@
import org.junit.Before;
import org.junit.Test;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.LinkedHashSet;
import java.util.LinkedList;
import java.util.List;
import java.util.Set;
import java.util.SortedSet;
import java.util.*;

import static org.hamcrest.CoreMatchers.instanceOf;
import static org.hamcrest.Matchers.contains;
import static org.hamcrest.Matchers.containsInAnyOrder;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertThat;
import static org.junit.Assert.*;

/**
* @author Dmytro Chyzhykov
Expand Down Expand Up @@ -61,6 +53,13 @@ public interface CollectionConfig extends Config {

@DefaultValue(INTEGERS)
CollectionWithoutDefaultConstructor<Integer> badCollection();

@DefaultValue("ONE")
EnumSet<EnumTest> enumSet();

enum EnumTest {
ONE, TWO, THREE
}
}

static class CollectionWithoutDefaultConstructor<E> extends ArrayList<E> {
Expand Down Expand Up @@ -116,5 +115,10 @@ public void itShouldWorkWithRawCollectionAsWithCollectionOfStrings() throws Exce
assertEquals(Arrays.asList("1", "2", "3"), cfg.rawCollection());
}

@Test
public void enumSetCreated() throws Exception {
assertTrue(cfg.enumSet().contains(CollectionConfig.EnumTest.ONE));
}

}