org.xblackcat.sjpu.skel.FunctionalClassBuilder Maven / Gradle / Ivy

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Service for generating DB access logic in simple way via interfaces and annotations

There is a newer version: 2.0

package org.xblackcat.sjpu.skel;

import org.xblackcat.sjpu.storage.IFunctionalAH;

import java.lang.reflect.Method;
import java.lang.reflect.Modifier;

/**
 * Functional builder allows only one abstract method per class/interface.
 *
 * @author xBlackCat
 */
public class FunctionalClassBuilder extends ClassBuilder {
    public FunctionalClassBuilder(IDefiner definerF, IMethodBuilder... builders) {
        super(definerF, builders);
    }

    @Override
    public  Class build(
            Class target
    ) throws GeneratorException {
        int abstractCount = 0;
        for (Method m : target.getMethods()) {
            if (Modifier.isAbstract(m.getModifiers())) {
                abstractCount++;
            }
        }
        for (Method m : target.getDeclaredMethods()) {
            if (!Modifier.isPublic(m.getModifiers()) && Modifier.isAbstract(m.getModifiers())) {
                abstractCount++;
            }
        }

        if (abstractCount != 1) {
            throw new GeneratorException(
                    "Only single abstract method is allowed for implementation of " +
                            BuilderUtils.getName(IFunctionalAH.class) + ". " + BuilderUtils.getName(target) + " has " +
                            abstractCount
            );
        }

        return super.build(target);
    }
}