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61 changes: 61 additions & 0 deletions
61
src/main/java/org/fuin/objects4j/common/HasPublicStaticIsValidMethodValidator.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,61 @@ | ||
| package org.fuin.objects4j.common; | ||
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| import jakarta.validation.ConstraintValidator; | ||
| import jakarta.validation.ConstraintValidatorContext; | ||
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| import java.lang.reflect.InvocationTargetException; | ||
| import java.lang.reflect.Method; | ||
| import java.lang.reflect.Modifier; | ||
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| /** | ||
| * Determines if the annotated class has: | ||
| * - a public static method with the given name | ||
| * - a parameter with the given type | ||
| * defined in the annotation and the return type of that method is {@literal boolean}. | ||
| */ | ||
| public class HasPublicStaticIsValidMethodValidator implements ConstraintValidator<HasPublicStaticIsValidMethod, Object> { | ||
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| private String methodName; | ||
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| private Class<?> paramClass; | ||
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| @Override | ||
| public void initialize(HasPublicStaticIsValidMethod annotation) { | ||
| this.methodName = annotation.method(); | ||
| this.paramClass = annotation.param(); | ||
| } | ||
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| @Override | ||
| public boolean isValid(Object obj, ConstraintValidatorContext context) { | ||
| try { | ||
| final Method method = obj.getClass().getMethod(methodName, paramClass); | ||
| final int modifiers = method.getModifiers(); | ||
| if (!Modifier.isStatic(modifiers)) { | ||
| error(context, "Method '" + methodName + "' is not static (#1)"); | ||
| return false; | ||
| } | ||
| if (method.getReturnType() != boolean.class) { | ||
| error(context, "Method '" + methodName + "' does not return 'boolean', but: " + method.getReturnType().getName() + " (#3)"); | ||
| return false; | ||
| } | ||
| final boolean valid = (boolean) method.invoke(obj, (Object) null); | ||
| if (!valid) { | ||
| error(context, "Method '" + methodName + "' is expected to return 'true' on 'null' argument, but was 'false' (#4)"); | ||
| return false; | ||
| } | ||
| return true; | ||
| } catch (final NoSuchMethodException ex) { | ||
| error(context, "The method '" + methodName + "' is undefined or it is not public (#2)"); | ||
| return false; | ||
| } catch (final IllegalAccessException | InvocationTargetException ex) { | ||
| throw new IllegalStateException("Failed to execute method", ex); | ||
| } | ||
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| } | ||
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| private void error(ConstraintValidatorContext context, String message) { | ||
| context.disableDefaultConstraintViolation(); | ||
| context.buildConstraintViolationWithTemplate(message).addConstraintViolation(); | ||
| } | ||
|
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| } |
21 changes: 21 additions & 0 deletions
21
src/main/java/org/fuin/objects4j/common/HasPublicStaticIsValidMethods.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,21 @@ | ||
| package org.fuin.objects4j.common; | ||
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| import java.lang.annotation.*; | ||
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| /** | ||
| * Collection of {@link HasPublicStaticIsValidMethod} annotations. | ||
| */ | ||
| @Documented | ||
| @Target(ElementType.TYPE) | ||
| @Inherited | ||
| @Retention(RetentionPolicy.RUNTIME) | ||
| public @interface HasPublicStaticIsValidMethods { | ||
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| /** | ||
| * Returns a list of {@link HasPublicStaticIsValidMethod} instances. | ||
| * | ||
| * @return Array of annotations. | ||
| */ | ||
| HasPublicStaticIsValidMethod[] value(); | ||
|
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| } |
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61 changes: 61 additions & 0 deletions
61
src/main/java/org/fuin/objects4j/common/HasPublicStaticValueOfMethodValidator.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,61 @@ | ||
| package org.fuin.objects4j.common; | ||
|
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| import jakarta.validation.ConstraintValidator; | ||
| import jakarta.validation.ConstraintValidatorContext; | ||
|
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| import java.lang.reflect.InvocationTargetException; | ||
| import java.lang.reflect.Method; | ||
| import java.lang.reflect.Modifier; | ||
|
|
||
| /** | ||
| * Determines if the annotated class has: | ||
| * - a public static method with the given name | ||
| * - a parameter with the given type | ||
| * defined in the annotation and the return type of that method is the same as the annotated class. | ||
| */ | ||
| public class HasPublicStaticValueOfMethodValidator implements ConstraintValidator<HasPublicStaticValueOfMethod, Object> { | ||
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| private String methodName; | ||
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| private Class<?> paramClass; | ||
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| @Override | ||
| public void initialize(HasPublicStaticValueOfMethod annotation) { | ||
| this.methodName = annotation.method(); | ||
| this.paramClass = annotation.param(); | ||
| } | ||
|
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| @Override | ||
| public boolean isValid(Object obj, ConstraintValidatorContext context) { | ||
| try { | ||
| final Method method = obj.getClass().getMethod(methodName, paramClass); | ||
| final int modifiers = method.getModifiers(); | ||
| if (!Modifier.isStatic(modifiers)) { | ||
| error(context, "Method '" + methodName + "' is not static (#1)"); | ||
| return false; | ||
| } | ||
| if (method.getReturnType() != obj.getClass()) { | ||
| error(context, "Method '" + methodName + "' does not return '" + obj.getClass().getName() + "', but: " + method.getReturnType().getName() + " (#3)"); | ||
| return false; | ||
| } | ||
| final Object value = method.invoke(obj, (Object) null); | ||
| if (value != null) { | ||
| error(context, "Method '" + methodName + "' is expected to return 'true' on 'null' argument, but was: " + value + " (#4)"); | ||
| return false; | ||
| } | ||
| return true; | ||
| } catch (final NoSuchMethodException ex) { | ||
| error(context, "The method '" + methodName + "' is undefined or it is not public (#2)"); | ||
| return false; | ||
| } catch (final IllegalAccessException | InvocationTargetException ex) { | ||
| throw new IllegalStateException("Failed to execute method", ex); | ||
| } | ||
|
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| } | ||
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| private void error(ConstraintValidatorContext context, String message) { | ||
| context.disableDefaultConstraintViolation(); | ||
| context.buildConstraintViolationWithTemplate(message).addConstraintViolation(); | ||
| } | ||
|
|
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| } |
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21 changes: 0 additions & 21 deletions
21
src/main/java/org/fuin/objects4j/common/IsValidCapables.java
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