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Java client for Appium Mobile Webdriver
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/*
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * See the NOTICE file distributed with this work for additional
 * information regarding copyright ownership.
 * 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 io.appium.java_client.pagefactory;

import static io.appium.java_client.pagefactory.ThrowableUtil.extractReadableException;
import static io.appium.java_client.pagefactory.utils.WebDriverUnpackUtility.getCurrentContentType;

import io.appium.java_client.pagefactory.bys.ContentType;
import io.appium.java_client.pagefactory.interceptors.InterceptorOfASingleElement;
import io.appium.java_client.pagefactory.locator.CacheableLocator;
import net.sf.cglib.proxy.MethodProxy;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.support.PageFactory;

import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.HashMap;
import java.util.Map;

class WidgetInterceptor extends InterceptorOfASingleElement {

    private final Map> instantiationMap;
    private final Map cachedInstances = new HashMap<>();
    private final TimeOutDuration duration;
    private WebElement cachedElement;

    WidgetInterceptor(CacheableLocator locator, WebDriver driver, WebElement cachedElement,
        Map> instantiationMap,
        TimeOutDuration duration) {
        super(locator, driver);
        this.cachedElement = cachedElement;
        this.instantiationMap = instantiationMap;
        this.duration = duration;
    }


    @Override protected Object getObject(WebElement element, Method method, Object[] args)
        throws Throwable {
        ContentType type = getCurrentContentType(element);
        if (cachedElement == null
            || (locator != null && !((CacheableLocator) locator)
            .isLookUpCached())
            || cachedInstances.size() == 0) {
            cachedElement = element;

            Constructor constructor = instantiationMap.get(type);
            Class clazz = constructor.getDeclaringClass();

            int modifiers = clazz.getModifiers();
            if (Modifier.isAbstract(modifiers)) {
                throw new InstantiationException(clazz.getName()
                        + " is abstract so "
                        + "it can't be instantiated");
            }

            Widget widget = constructor.newInstance(cachedElement);
            cachedInstances.put(type, widget);
            PageFactory.initElements(new AppiumFieldDecorator(widget, duration), widget);
        }
        try {
            method.setAccessible(true);
            return method.invoke(cachedInstances.get(type), args);
        } catch (Throwable t) {
            throw extractReadableException(t);
        }
    }

    public Object intercept(Object obj, Method method, Object[] args, MethodProxy proxy)
        throws Throwable {
        if (locator != null) {
            return super.intercept(obj, method, args, proxy);
        }
        return getObject(cachedElement, method, args);
    }
}