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/*
 * Copyright (c) 2016 Mockito contributors
 * This program is made available under the terms of the MIT License.
 */
package org.mockito.internal.configuration.plugins;

import java.lang.reflect.Proxy;
import java.util.Optional;
import java.util.ServiceLoader;

class PluginLoader {

    private final DefaultMockitoPlugins plugins = new DefaultMockitoPlugins();

    /**
     * Scans the classpath for given pluginType. If not found, default class is used.
     */
    @SuppressWarnings("unchecked")
     T loadPlugin(final Class pluginType) {
        try {
            ServiceLoader serviceLoader = ServiceLoader.load(pluginType);
            Optional plugin = serviceLoader.findFirst();
            return plugin.orElseGet(() -> plugins.getDefaultPlugin(pluginType));
        } catch (final Throwable t) {
            return (T) Proxy.newProxyInstance(pluginType.getClassLoader(),
                    new Class[]{pluginType},
                    (proxy, method, args) -> {
                        throw new IllegalStateException("Could not initialize plugin: " + pluginType, t);
                    });
        }
    }
}