net.n2oapp.framework.engine.data.java.JavaDataProviderEngine Maven / Gradle / Ivy

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package net.n2oapp.framework.engine.data.java;

import net.n2oapp.framework.api.data.ArgumentsInvocationEngine;
import net.n2oapp.framework.api.exception.N2oException;
import net.n2oapp.framework.api.exception.N2oUserException;
import net.n2oapp.framework.api.metadata.dataprovider.DIProvider;
import net.n2oapp.framework.api.metadata.dataprovider.N2oJavaDataProvider;
import org.springframework.util.MethodInvoker;

import java.lang.reflect.InvocationTargetException;
import java.util.Collections;
import java.util.List;

/**
 * Провайдер данных через вызовы Java методов
 */
public class JavaDataProviderEngine implements ArgumentsInvocationEngine {

    private List locators = Collections.emptyList();

    @Override
    public Class getType() {
        return N2oJavaDataProvider.class;
    }

    @Override
    public Object invoke(N2oJavaDataProvider dataProvider, Object[] data) {
        Class targetClass = findTargetClass(dataProvider);
        Object targetObject = null;
        if (dataProvider.getDiProvider() != null)
            targetObject = match(dataProvider.getDiProvider()).locate(targetClass, dataProvider.getDiProvider());
        return invokeMethod(targetClass, dataProvider.getMethod(), targetObject, data);
    }

    private Class findTargetClass(N2oJavaDataProvider dataProvider) {
        if (dataProvider.getClassName() == null)
            return null;
        Class targetClass = null;
        try {
            targetClass = Class.forName(dataProvider.getClassName());
        } catch (ClassNotFoundException e) {
            throw new N2oException(e);
        }
        return targetClass;
    }

    private  ObjectLocator match(T provider) {
        return locators.stream().filter(l -> l.match(provider))
                .findAny().orElseThrow(() -> new IllegalArgumentException("No such data provider " + provider));
    }

    public void setLocators(List locators) {
        this.locators = locators;
    }

    private Object invokeMethod(Class targetClass, String method, Object targetObject, Object[] args) {
        MethodInvoker methodInvoker = new MethodInvoker();
        methodInvoker.setTargetClass(targetClass);
        methodInvoker.setTargetObject(targetObject);
        methodInvoker.setTargetMethod(method);
        methodInvoker.setArguments(args);

        try {
            methodInvoker.prepare();
            return methodInvoker.invoke();
        } catch (InvocationTargetException e) {
            if (e.getTargetException() instanceof N2oException)
                throw (N2oException)e.getTargetException();
            throw new N2oException(e.getTargetException());
        } catch (NoSuchMethodException | IllegalAccessException | ClassNotFoundException e) {
            throw new N2oException(e);
        }
    }
}