package com.atlassian.maven.plugins.amps.codegen;

import java.io.File;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.TreeMap;

import com.atlassian.maven.plugins.amps.codegen.annotations.asm.ProductContextProviderLocator;

/**
 * @since 3.6
 */
public class ContextProviderFactory
{
    protected static Map<String, String> providers = new TreeMap<String, String>();

    public static void locateAvailableContextProviders(String productId, List<String> classpathElements) throws Exception
    {
        List<URL> conditionURLs = new ArrayList<URL>();
        for (String path : classpathElements)
        {
            File aFile = new File(path);
            conditionURLs.add(aFile.toURI()
                    .toURL());
        }

        URLClassLoader conditionLoader = URLClassLoader.newInstance(conditionURLs.toArray(new URL[]{}));
        ClassLoader oldLoader = Thread.currentThread()
                .getContextClassLoader();
        Thread.currentThread()
                .setContextClassLoader(conditionLoader);

        ProductContextProviderLocator locator = new ProductContextProviderLocator(productId, providers);
        locator.parse();

        Thread.currentThread()
                .setContextClassLoader(oldLoader);
    }

    public static Map<String, String> getAvailableContextProviders()
    {
        return providers;
    }
}