net.codestory.simplelenium.reflection.ReflectionUtil.java Source code

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Here is the source code for net.codestory.simplelenium.reflection.ReflectionUtil.java

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/**
 * Copyright (C) 2013-2015 all@code-story.net
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License
 */
package net.codestory.simplelenium.reflection;

import net.codestory.simplelenium.DomElement;
import net.codestory.simplelenium.SectionObject;
import net.codestory.simplelenium.filters.LazyDomElement;
import org.openqa.selenium.support.ByIdOrName;

import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.util.function.Function;

import static java.lang.String.format;
import static java.lang.reflect.Modifier.isFinal;

public class ReflectionUtil {
    private ReflectionUtil() {
        // Static class
    }

    public static void injectMissingPageObjects(Object instance) {
        injectNullFieldsOfType(SectionObject.class, instance, field -> {
            SectionObject pageObject = newInstance((Class<? extends SectionObject>) field.getType());
            injectMissingElements(pageObject);
            return pageObject;
        });
    }

    public static void injectMissingElements(Object pageObject) {
        injectMissingPageObjects(pageObject);
        injectNullFieldsOfType(DomElement.class, pageObject,
                field -> new LazyDomElement(new ByIdOrName(field.getName())));
        injectNullFieldsWithConstructorParameterOfType(DomElement.class, pageObject,
                field -> new LazyDomElement(new ByIdOrName(field.getName())));
    }

    public static <T> void injectNullFieldsOfType(Class<T> type, Object target, Function<Field, T> factory) {
        for (Field field : target.getClass().getDeclaredFields()) {
            if (!isFinal(field.getModifiers()) && type.isAssignableFrom(field.getType())) {
                try {
                    field.setAccessible(true);
                    if (field.get(target) == null) {
                        field.set(target, factory.apply(field));
                    }
                } catch (IllegalAccessException e) {
                    throw new IllegalStateException(format("Unable to set field [%s] on instance of type [%s]",
                            field.getName(), target.getClass().getName()));
                }
            }
        }
    }

    public static <T> void injectNullFieldsWithConstructorParameterOfType(Class<T> type, Object target,
            Function<Field, T> factory) {
        for (Field field : target.getClass().getDeclaredFields()) {
            try {
                if (!isFinal(field.getModifiers())) {
                    field.setAccessible(true);
                    if (field.get(target) == null) {
                        Constructor<?> constructor = field.getType().getDeclaredConstructor(type);
                        constructor.setAccessible(true);
                        field.set(target, constructor.newInstance(factory.apply(field)));
                    }
                }
            } catch (IllegalAccessException | InstantiationException | InvocationTargetException e) {
                throw new IllegalStateException(format("Unable to set field [%s] on instance of type [%s]",
                        field.getName(), target.getClass().getName()));
            } catch (NoSuchMethodException e) {
                // Ignore
            }
        }
    }

    public static <T> T newInstance(Class<T> type) {
        Constructor<T> constructor;
        try {
            constructor = type.getDeclaredConstructor();
            constructor.setAccessible(true);
        } catch (NoSuchMethodException e) {
            throw new IllegalArgumentException(
                    "Couldn't create Page Object. Missing 0 arg constructor on type " + type, e);
        }

        T instance;
        try {
            instance = constructor.newInstance();
        } catch (InstantiationException | IllegalAccessException | InvocationTargetException e) {
            throw new IllegalArgumentException("Unable to create instance of type " + type, e);
        }

        return instance;
    }
}