cat brain.stuff > wordpress

import java.lang.annotation.Documented;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;
 
import static java.lang.annotation.ElementType.*;
import static java.lang.annotation.RetentionPolicy.*;
 
import java.lang.annotation.Repeatable;
import javax.validation.Constraint;
import javax.validation.Payload;
 
@Target({TYPE})
@Retention(RUNTIME)
@Repeatable(Predicate.List.class)
@Constraint(validatedBy = PredicateValidator.class)
@Documented
public @interface Predicate {
 
	String message() default "{predicate.invalid}";
 
	Class<?>[] groups() default {};
 
	Class<? extends Payload>[] payload() default {};
 
	String name();
 
	@Target({TYPE})
	@Retention(RUNTIME)
	@Documented
	public @interface List {
		Predicate[] value();
	}
}

import java.util.HashMap;
import java.util.Map;
 
import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;
 
public class PredicateValidator implements ConstraintValidator<Predicate, Object> {
 
	private static final Map<String, java.util.function.Predicate> PREDICATES = new HashMap<>();
 
	private java.util.function.Predicate predicate;
 
	@Override
	public void initialize(Predicate predicate) {
		if (!PREDICATES.containsKey(predicate.name())) {
			throw new IllegalArgumentException("No predicate with name " + predicate.name() + " found");
		}
		this.predicate = PREDICATES.get(predicate.name());
	}
 
	@Override
	public boolean isValid(Object value, ConstraintValidatorContext context) {
		return predicate.test(value);
	}
 
	public static void addPredicate(String name, java.util.function.Predicate p) {
		PREDICATES.put(name, p);
	}
}

import java.util.Objects;
 
@Predicate(name = "myPredicate")
@Predicate(name = "myPredicate2")
public class Pojo {
 
	static {
		PredicateValidator.addPredicate("myPredicate", obj -> {
			Pojo p = (Pojo) obj;
			System.out.println("Test 1");
			return Objects.equals(p.getValueOne(), p.getValueTwo());
		});
 
		PredicateValidator.addPredicate("myPredicate2", obj -> {
			Pojo p = (Pojo) obj;
			System.out.println("Test 2");
			return Objects.equals(p.getValueOne(), p.getValueTwo());
		});
	}
 
	private String valueOne;
	private String valueTwo;
 
	public String getValueOne() {
		return valueOne;
	}
 
	public void setValueOne(String valueOne) {
		this.valueOne = valueOne;
	}
 
	public String getValueTwo() {
		return valueTwo;
	}
 
	public void setValueTwo(String valueTwo) {
		this.valueTwo = valueTwo;
	}
 
}