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See [issue](j-easy#425) Pass the actual type along with a field that will be used to pick correct randomizer. Consider the following example: ``` abstract class Base<T> { T t; } class Concrete extends Base<String> {} ``` If we only rely on `Field.getType()`, property `Concrete.t` would be randomized as `Object` and then cause a runtime exception when used. Java reflection API provides a way to get the actual type, in this case `String`. This information is passed in `GenericField` so that the correct randomizer can be picked later.
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Olli Kuonanoja
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Aug 17, 2020
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easy-random-core/src/main/java/org/jeasy/random/util/GenericField.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.util; | ||
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| import java.lang.reflect.Field; | ||
| import java.util.Objects; | ||
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| /** | ||
| * Support type variables for {@link Field} | ||
| * | ||
| * When using type variables, {@link Field#getType()} will return the lower bound class. | ||
| * However, in case the generic field is part of a base class, the actual type is sometimes | ||
| * known. This class wraps {@link Field} and contains the actual type as well. | ||
| * | ||
| */ | ||
| public class GenericField { | ||
| private final Field field; | ||
| private final Class<?> type; | ||
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| public GenericField(Field field, Class<?> type) { | ||
| this.field = field; | ||
| this.type = type; | ||
| } | ||
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| public GenericField(Field field) { | ||
| this(field, field.getType()); | ||
| } | ||
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| /** | ||
| * @return The wrapped {@link Field} | ||
| */ | ||
| public Field getField() { | ||
| return field; | ||
| } | ||
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| /** | ||
| * @return The type of the field, possibly a resolved type variable | ||
| */ | ||
| public Class<?> getType() { | ||
| return type; | ||
| } | ||
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| public String getName() { | ||
| return field.getName(); | ||
| } | ||
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| @Override | ||
| public boolean equals(Object o) { | ||
| if (this == o) return true; | ||
| if (o == null || getClass() != o.getClass()) return false; | ||
| GenericField that = (GenericField) o; | ||
| return Objects.equals(field, that.field) && | ||
| Objects.equals(type, that.type); | ||
| } | ||
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| @Override | ||
| public int hashCode() { | ||
| return Objects.hash(field, type); | ||
| } | ||
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| @Override | ||
| public String toString() { | ||
| return "GenericField{" + | ||
| "field=" + field + | ||
| ", type=" + type + | ||
| '}'; | ||
| } | ||
| } |
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