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Support for generic types in containers
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package picocli; | ||
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import org.junit.Test; | ||
import picocli.CommandLine.MissingTypeConverterException; | ||
import picocli.CommandLine.UseDefaultConverter; | ||
import picocli.CommandLine.Option; | ||
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import java.util.List; | ||
import java.util.Map; | ||
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import static org.junit.Assert.assertEquals; | ||
import static org.junit.Assert.fail; | ||
import static picocli.CommandLine.ITypeConverter; | ||
import static picocli.CommandLine.Parameters; | ||
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public class GenericTest { | ||
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static final class GenericValue<T> { | ||
private final T value; | ||
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public GenericValue(T value) { | ||
this.value = value; | ||
} | ||
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public T getValue() { | ||
return value; | ||
} | ||
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@Override | ||
public String toString() { | ||
return "GenericValue{" + | ||
"value=" + value + | ||
'}'; | ||
} | ||
} | ||
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static final class GenericValueConverter implements ITypeConverter<GenericValue<?>> { | ||
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public GenericValue<?> convert(String value) throws Exception { | ||
if (value.startsWith("s")) { | ||
return new GenericValue<String>(value); | ||
} | ||
return new GenericValue<Integer>(Integer.parseInt(value)); | ||
} | ||
} | ||
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@Test | ||
public void testListOfGenericClasses() { | ||
class App { | ||
@Parameters(arity = "0..*", converter = GenericValueConverter.class) | ||
List<GenericValue<?>> values; | ||
} | ||
App app = CommandLine.populateCommand(new App(), "sOne", "15"); | ||
assertEquals(2, app.values.size()); | ||
assertEquals(String.class, app.values.get(0).value.getClass()); | ||
assertEquals("sOne", app.values.get(0).value); | ||
assertEquals(Integer.class, app.values.get(1).value.getClass()); | ||
assertEquals(15, app.values.get(1).value); | ||
} | ||
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@Test | ||
public void testListOfGenericClassesNoConverter() { | ||
class NoConverterApp { | ||
@Parameters(arity = "0..*") | ||
List<GenericValue<?>> values; | ||
} | ||
try { | ||
CommandLine.populateCommand(new NoConverterApp(), "sOne", "15"); | ||
fail("Expected exception"); | ||
} catch (MissingTypeConverterException ex) { | ||
assertEquals("No TypeConverter registered for picocli.GenericTest$GenericValue of field java.util.List<picocli.GenericTest$GenericValue<?>> picocli.GenericTest$1NoConverterApp.values", ex.getMessage()); | ||
} | ||
} | ||
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@Test | ||
public void testListOfGenericWithGlobalConverter() { | ||
class NoConverterApp { | ||
@Parameters(arity = "0..*") | ||
List<GenericValue<?>> values; | ||
} | ||
@SuppressWarnings("rawtypes") | ||
class GenericConverter implements ITypeConverter<GenericValue> { | ||
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@Override | ||
public GenericValue convert(String value) throws Exception { | ||
return new GenericValue<>("abc"); | ||
} | ||
} | ||
NoConverterApp app = new NoConverterApp(); | ||
new CommandLine(app).registerConverter(GenericValue.class, new GenericConverter()).parseArgs("xyz"); | ||
assertEquals(1, app.values.size()); | ||
assertEquals(String.class, app.values.get(0).value.getClass()); | ||
assertEquals("abc", app.values.get(0).value); | ||
} | ||
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@Test | ||
public void testMapOfGenericClasses() { | ||
class App { | ||
@Option(names = "-D", converter = {UseDefaultConverter.class, GenericValueConverter.class}) | ||
Map<String, GenericValue<?>> values; | ||
} | ||
App app = CommandLine.populateCommand(new App(), "-Dkey1=sOne", "-Dkey2=15"); | ||
assertEquals(2, app.values.size()); | ||
assertEquals(String.class, app.values.get("key1").value.getClass()); | ||
assertEquals("sOne", app.values.get("key1").value); | ||
assertEquals(Integer.class, app.values.get("key2").value.getClass()); | ||
assertEquals(15, app.values.get("key2").value); | ||
} | ||
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@Test | ||
public void testSingleValueGenericWildcardClass() { | ||
class App { | ||
@Parameters(converter = GenericValueConverter.class) | ||
GenericValue<?> value; | ||
} | ||
App app = CommandLine.populateCommand(new App(), "sTest"); | ||
assertEquals(String.class, app.value.value.getClass()); | ||
assertEquals("sTest", app.value.value); | ||
} | ||
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@Test | ||
public void testSingleValueGenericConcreteClass() { | ||
class App { | ||
@Parameters(converter = GenericValueConverter.class) | ||
GenericValue<Integer> value; | ||
} | ||
App app = CommandLine.populateCommand(new App(), "3"); | ||
assertEquals(Integer.class, app.value.value.getClass()); | ||
assertEquals(Integer.valueOf(3), app.value.value); | ||
} | ||
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} |