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Fixed #28 and improved depth check and code refactoring.
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219 changes: 219 additions & 0 deletions
219
easy-random-core/src/main/java/org/jeasy/random/RecordFieldPopulator.java
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| /* | ||
| * The MIT License | ||
| * | ||
| * Copyright (c) 2020, Mahmoud Ben Hassine ([email protected]) | ||
| * | ||
| * Permission is hereby granted, free of charge, to any person obtaining a copy | ||
| * of this software and associated documentation files (the "Software"), to deal | ||
| * in the Software without restriction, including without limitation the rights | ||
| * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
| * copies of the Software, and to permit persons to whom the Software is | ||
| * furnished to do so, subject to the following conditions: | ||
| * | ||
| * The above copyright notice and this permission notice shall be included in | ||
| * all copies or substantial portions of the Software. | ||
| * | ||
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
| * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | ||
| * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | ||
| * THE SOFTWARE. | ||
| */ | ||
| package org.jeasy.random; | ||
|
|
||
| import static org.jeasy.random.util.ReflectionUtils.*; | ||
|
|
||
| import java.lang.reflect.Field; | ||
| import java.lang.reflect.ParameterizedType; | ||
| import java.lang.reflect.Type; | ||
| import java.lang.reflect.TypeVariable; | ||
| import java.util.List; | ||
| import org.jeasy.random.api.ContextAwareRandomizer; | ||
| import org.jeasy.random.api.Randomizer; | ||
| import org.jeasy.random.api.RandomizerProvider; | ||
| import org.jeasy.random.randomizers.misc.SkipRandomizer; | ||
|
|
||
| /** | ||
| * Component that encapsulates the logic of generating a random value for a given field. | ||
| * It collaborates with a: | ||
| * <ul> | ||
| * <li>{@link EasyRandom} whenever the field is a user defined type.</li> | ||
| * <li>{@link ArrayPopulator} whenever the field is an array type.</li> | ||
| * <li>{@link CollectionPopulator} whenever the field is a collection type.</li> | ||
| * <li>{@link CollectionPopulator}whenever the field is a map type.</li> | ||
| * </ul> | ||
| * | ||
| * @author Mahmoud Ben Hassine ([email protected]) | ||
| */ | ||
| class RecordFieldPopulator { | ||
|
|
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| private final EasyRandom easyRandom; | ||
|
|
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| private final ArrayPopulator arrayPopulator; | ||
|
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| private final CollectionPopulator collectionPopulator; | ||
|
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| private final MapPopulator mapPopulator; | ||
|
|
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| private final OptionalPopulator optionalPopulator; | ||
|
|
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| private final RandomizerProvider randomizerProvider; | ||
|
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| RecordFieldPopulator( | ||
| final EasyRandom easyRandom, | ||
| final RandomizerProvider randomizerProvider, | ||
| final ArrayPopulator arrayPopulator, | ||
| final CollectionPopulator collectionPopulator, | ||
| final MapPopulator mapPopulator, | ||
| OptionalPopulator optionalPopulator | ||
| ) { | ||
| this.easyRandom = easyRandom; | ||
| this.randomizerProvider = randomizerProvider; | ||
| this.arrayPopulator = arrayPopulator; | ||
| this.collectionPopulator = collectionPopulator; | ||
| this.mapPopulator = mapPopulator; | ||
| this.optionalPopulator = optionalPopulator; | ||
| } | ||
|
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| Object populateField(final Field field, Class<?> enclosingType, final RandomizationContext context) | ||
| throws IllegalAccessException { | ||
| Randomizer<?> randomizer = getRandomizer(field, context, enclosingType); | ||
| if (randomizer instanceof SkipRandomizer) { | ||
| return null; | ||
| } | ||
| //context.pushStackItem(new RandomizationContextStackItem(null, field)); | ||
| if (randomizer instanceof ContextAwareRandomizer) { | ||
| ((ContextAwareRandomizer<?>) randomizer).setRandomizerContext(context); | ||
| } | ||
| if (!context.hasExceededRandomizationDepth()) { | ||
| Object value; | ||
| if (randomizer != null) { | ||
| value = randomizer.getRandomValue(); | ||
| } else { | ||
| try { | ||
| value = generateRandomValue(field, context); | ||
| } catch (ObjectCreationException e) { | ||
| String exceptionMessage = String.format( | ||
| "Unable to create type: %s for field: %s of class: %s", | ||
| field.getType().getName(), | ||
| field.getName(), | ||
| enclosingType.getName() | ||
| ); | ||
| // FIXME catch ObjectCreationException and throw ObjectCreationException ? | ||
| throw new ObjectCreationException(exceptionMessage, e); | ||
| } | ||
| } | ||
| return value; | ||
| } | ||
| //context.popStackItem(); | ||
| return null; | ||
| } | ||
|
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||
| private Randomizer<?> getRandomizer(Field field, RandomizationContext context, Class<?> fieldTargetType) { | ||
| // issue 241: if there is no custom randomizer by field, then check by type | ||
| Randomizer<?> randomizer = randomizerProvider.getRandomizerByField(field, context); | ||
| if (randomizer == null) { | ||
| Type genericType = field.getGenericType(); | ||
| if (isTypeVariable(genericType)) { | ||
| // if generic type, retrieve actual type from declaring class | ||
| Class<?> type = getParametrizedType(field, fieldTargetType); | ||
| randomizer = randomizerProvider.getRandomizerByType(type, context); | ||
| } else { | ||
| randomizer = randomizerProvider.getRandomizerByType(field.getType(), context); | ||
| } | ||
| } | ||
| return randomizer; | ||
| } | ||
|
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| private Object generateRandomValue(final Field field, final RandomizationContext context) { | ||
| Class<?> fieldType = field.getType(); | ||
| Type fieldGenericType = field.getGenericType(); | ||
|
|
||
| if (isArrayType(fieldType)) { | ||
| return arrayPopulator.getRandomArray(fieldType, context); | ||
| } else if (isCollectionType(fieldType)) { | ||
| return collectionPopulator.getRandomCollection(field, context); | ||
| } else if (isMapType(fieldType)) { | ||
| return mapPopulator.getRandomMap(field, context); | ||
| } else if (isOptionalType(fieldType)) { | ||
| return optionalPopulator.getRandomOptional(field, context); | ||
| } else { | ||
| if ( | ||
| context.getParameters().isScanClasspathForConcreteTypes() && | ||
| isAbstract(fieldType) && | ||
| !isEnumType(fieldType) | ||
| /*enums can be abstract, but cannot inherit*/ | ||
| ) { | ||
| List<Class<?>> parameterizedTypes = filterSameParameterizedTypes( | ||
| getPublicConcreteSubTypesOf(fieldType), | ||
| fieldGenericType | ||
| ); | ||
| if (parameterizedTypes.isEmpty()) { | ||
| throw new ObjectCreationException( | ||
| "Unable to find a matching concrete subtype of type: " + fieldType | ||
| ); | ||
| } else { | ||
| Class<?> randomConcreteSubType = parameterizedTypes.get( | ||
| easyRandom.nextInt(parameterizedTypes.size()) | ||
| ); | ||
| return easyRandom.doPopulateBean(randomConcreteSubType, context); | ||
| } | ||
| } else { | ||
| Type genericType = field.getGenericType(); | ||
| if (isTypeVariable(genericType)) { | ||
| // if generic type, try to retrieve actual type from hierarchy | ||
| Class<?> type = getParametrizedType(field, context.getTargetType()); | ||
| return easyRandom.doPopulateBean(type, context); | ||
| } | ||
| return easyRandom.doPopulateBean(fieldType, context); | ||
| } | ||
| } | ||
| } | ||
|
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| private Class<?> getParametrizedType(Field field, Class<?> fieldTargetType) { | ||
| Class<?> declaringClass = field.getDeclaringClass(); | ||
| TypeVariable<? extends Class<?>>[] typeParameters = declaringClass.getTypeParameters(); | ||
| Type genericSuperclass = getGenericSuperClass(fieldTargetType); | ||
| ParameterizedType parameterizedGenericSuperType = (ParameterizedType) genericSuperclass; | ||
| Type[] actualTypeArguments = parameterizedGenericSuperType.getActualTypeArguments(); | ||
| Type actualTypeArgument = null; | ||
| for (int i = 0; i < typeParameters.length; i++) { | ||
| if (field.getGenericType().equals(typeParameters[i])) { | ||
| actualTypeArgument = actualTypeArguments[i]; | ||
| } | ||
| } | ||
| if (actualTypeArgument == null) { | ||
| return field.getType(); | ||
| } | ||
| Class<?> aClass; | ||
| String typeName = null; | ||
| try { | ||
| typeName = actualTypeArgument.getTypeName(); | ||
| aClass = Class.forName(typeName); | ||
| } catch (ClassNotFoundException e) { | ||
| String message = String.format( | ||
| "Unable to load class %s of generic field %s in class %s. " + | ||
| "Please refer to the documentation as this generic type may not be supported for randomization.", | ||
| typeName, | ||
| field.getName(), | ||
| field.getDeclaringClass().getName() | ||
| ); | ||
| throw new ObjectCreationException(message, e); | ||
| } | ||
| return aClass; | ||
| } | ||
|
|
||
| // find the generic base class in the hierarchy (which might not be the first super type) | ||
| private Type getGenericSuperClass(Class<?> targetType) { | ||
| Type genericSuperclass = targetType.getGenericSuperclass(); | ||
| while (targetType != null && !(genericSuperclass instanceof ParameterizedType)) { | ||
| targetType = targetType.getSuperclass(); | ||
| if (targetType != null) { | ||
| genericSuperclass = targetType.getGenericSuperclass(); | ||
| } | ||
| } | ||
| return genericSuperclass; | ||
| } | ||
| } |
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