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Rhino is an open-source implementation of JavaScript written entirely in Java. It is typically embedded into Java applications to provide scripting to end users.

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/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

package org.mozilla.javascript.commonjs.module.provider;

import java.net.URI;
import java.util.LinkedList;
import java.util.List;
import org.mozilla.javascript.Context;
import org.mozilla.javascript.Scriptable;
import org.mozilla.javascript.commonjs.module.ModuleScript;
import org.mozilla.javascript.commonjs.module.ModuleScriptProvider;

/**
 * A multiplexer for module script providers.
 *
 * @author Attila Szegedi
 * @version $Id: MultiModuleScriptProvider.java,v 1.4 2011/04/07 20:26:12 hannes%helma.at Exp $
 */
public class MultiModuleScriptProvider implements ModuleScriptProvider {
    private final ModuleScriptProvider[] providers;

    /**
     * Creates a new multiplexing module script provider tht gathers the specified providers
     *
     * @param providers the providers to multiplex.
     */
    public MultiModuleScriptProvider(Iterable providers) {
        final List l = new LinkedList<>();
        for (ModuleScriptProvider provider : providers) {
            l.add(provider);
        }
        this.providers = l.toArray(new ModuleScriptProvider[0]);
    }

    @Override
    public ModuleScript getModuleScript(
            Context cx, String moduleId, URI uri, URI base, Scriptable paths) throws Exception {
        for (ModuleScriptProvider provider : providers) {
            final ModuleScript script = provider.getModuleScript(cx, moduleId, uri, base, paths);
            if (script != null) {
                return script;
            }
        }
        return null;
    }
}