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/*
 * Fabric3
 * Copyright (c) 2009-2015 Metaform Systems
 *
 * 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 org.fabric3.plugin.util;

import java.io.File;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;
import java.util.Set;

import org.eclipse.aether.artifact.Artifact;
import org.fabric3.api.host.classloader.DelegatingResourceClassLoader;

/**
 * Creates runtime classloaders.
 */
public class ClassLoaderHelper {
    /**
     * Creates the classloader to boot the runtime.
     *
     * @param parent    the parent classloader
     * @param artifacts the set of artifacts to include on the boot classpath
     * @return the boot classloader
     */
    public static ClassLoader createBootClassLoader(ClassLoader parent, Set artifacts) {
        URL[] urls = new URL[artifacts.size()];
        int i = 0;
        for (Artifact artifact : artifacts) {
            File file = artifact.getFile();
            assert file != null;
            try {
                urls[i++] = file.toURI().toURL();
            } catch (MalformedURLException e) {
                // toURI should have made this valid
                throw new AssertionError(e);
            }
        }

        return new DelegatingResourceClassLoader(urls, parent);
    }

    /**
     * Creates the host classloader based on the given set of artifacts.
     *
     * @param parent        the parent classloader
     * @param hostArtifacts the  artifacts
     * @return the host classloader
     */
    public static ClassLoader createHostClassLoader(ClassLoader parent, Set hostArtifacts) {
        List urls = new ArrayList<>(hostArtifacts.size());
        for (Artifact artifact : hostArtifacts) {
            try {
                File pathElement = artifact.getFile();
                URL url = pathElement.toURI().toURL();
                urls.add(url);
            } catch (MalformedURLException e) {
                // toURI should have encoded the URL
                throw new AssertionError(e);
            }

        }
        return new DelegatingResourceClassLoader(urls.toArray(new URL[urls.size()]), parent);
    }
}