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package au.id.zancanaro.javacheck.object;
import au.id.zancanaro.javacheck.DataSourceHelper;
import au.id.zancanaro.javacheck.Generator;
import java.lang.annotation.Annotation;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.lang.reflect.TypeVariable;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.Set;
import static au.id.zancanaro.javacheck.Generators.*;
public interface GeneratorProvider {
Generator<?> getGenerator(Type type, Annotation[] annotations, GeneratorProvider topLevel);
final static GeneratorProvider DEFAULT_PROVIDER = new GeneratorProvider() {
@SuppressWarnings("unchecked")
private <T> T getAnnotation(Annotation[] annotations, Class<T> type) {
for (Annotation ann : annotations) {
if (type.isAssignableFrom(ann.getClass())) {
return (T) ann;
}
}
return null;
}
@Override
public Generator<?> getGenerator(Type type, Annotation[] annotations, GeneratorProvider provider) {
UseGenerator generator = getAnnotation(annotations, UseGenerator.class);
if (generator != null) {
try {
return generator.value().getConstructor().newInstance();
} catch (InvocationTargetException | NoSuchMethodException | InstantiationException | IllegalAccessException ex) {
throw new ObjectGenerationException("Could not construct generator of type " + generator.value(), ex);
}
} else if (type == Integer.TYPE || type == Integer.class) {
IntRange range = getAnnotation(annotations, IntRange.class);
if (range == null) {
return integer();
} else {
return integer(range.min(), range.max());
}
} else if (type == Long.TYPE || type == Long.class) {
LongRange range = getAnnotation(annotations, LongRange.class);
if (range == null) {
return longInteger();
} else {
return longInteger(range.min(), range.max());
}
} else if (type == Double.TYPE || type == Double.class) {
DoubleRange range = getAnnotation(annotations, DoubleRange.class);
if (range == null) {
return doublePrecision();
} else {
return doublePrecision(range.min(), range.max());
}
} else if (type == String.class) {
CharType charType = getAnnotation(annotations, CharType.class);
if (charType == null) {
return string();
} else {
switch (charType.value()) {
case ALPHA:
return stringOf(alphaCharacter());
case ALPHA_NUMERIC:
return stringOf(alphaNumericCharacter());
case ASCII:
return stringOf(asciiCharacter());
case ALL:
return stringOf(character());
default:
return string();
}
}
} else if (type == List.class) {
return listOf(provider.getGenerator(
List.class.getTypeParameters()[0],
new Annotation[0],
provider));
} else if (type == Set.class) {
return setOf(provider.getGenerator(
Set.class.getTypeParameters()[0],
new Annotation[0],
provider));
} else if (type == Map.class) {
TypeVariable<?>[] params = Map.class.getTypeParameters();
TypeVariable<?> keyType = params[0], valueType = params[1];
return mapOf(
provider.getGenerator(keyType, new Annotation[0], provider),
provider.getGenerator(valueType, new Annotation[0], provider));
} else if (type instanceof Class) {
Class<?> clazz = (Class<?>) type;
if (Enum.class.isAssignableFrom(clazz)) {
return elements(clazz.getEnumConstants());
} else {
return ofType((Class<?>) type, provider);
}
} else if (type instanceof ParameterizedType) {
ParameterizedType param = (ParameterizedType) type;
if (param.getRawType() instanceof Class) {
Class<?> container = (Class) param.getRawType();
TypeVariable<?>[] variables = container.getTypeParameters();
Type[] types = param.getActualTypeArguments();
return provider.getGenerator(
container,
new Annotation[0],
provider.withSubstitutedTypeVariables(variables, types));
}
throw new ObjectGenerationException("Cannot generate object of type " + type);
} else {
throw new ObjectGenerationException("Cannot generate object of type " + type);
}
}
};
default GeneratorProvider withSubstitutedTypeVariables(TypeVariable<?>[] variables, Type[] types) {
GeneratorProvider fallback = this;
return new GeneratorProvider() {
@Override
public Generator<?> getGenerator(Type type, Annotation[] annotations, GeneratorProvider provider) {
for (int i = 0; i < variables.length; ++i) {
if (Objects.equals(variables[i], type)) {
return provider.getGenerator(
types[i],
new Annotation[0],
this);
}
}
return fallback.getGenerator(type, annotations, provider);
}
};
}
default GeneratorProvider withDataSources(Class<?> wrappingType) {
DataSourceHelper helper = new DataSourceHelper(wrappingType);
Map<Type, Generator<?>> generators = helper.computeGenerators();
return (type, annotations, provider) -> {
if (generators.containsKey(type)) {
return generators.get(type);
} else {
return this.getGenerator(type, annotations, provider);
}
};
}
}
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