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The Alexa Skills Kit MVC Framework extends the existing ASK SDK, adding features for mapping requests to methods and rendering responses via view scripts and templates such as Nashorn Javascript and Freemarker. It also integrates with the ASK SDK Interaction Model Mapper framework to create a single environment where both the interaction model and business logic of skills can be managed as code packages.

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/*
    Copyright 2018 Amazon.com, Inc. or its affiliates. All Rights Reserved.

    Licensed under the Apache License, Version 2.0 (the "License"). You may not use this file
    except in compliance with the License. A copy of the License is located at

        http://aws.amazon.com/apache2.0/

    or in the "license" file accompanying this file. This file 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 com.amazon.ask.mvc.view.nashorn;

import com.amazon.ask.mvc.view.View;
import com.amazon.ask.mvc.view.resolver.ScriptEngineViewResolver;
import com.amazon.ask.mvc.view.resolver.cache.ViewCache;
import com.amazon.ask.mvc.view.resolver.candidate.ViewCandidateEnumerator;
import com.fasterxml.jackson.databind.ObjectMapper;
import jdk.nashorn.api.scripting.NashornScriptEngine;
import org.apache.commons.io.IOUtils;

import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import java.io.Reader;
import java.util.Collection;
import java.util.List;
import java.util.regex.Pattern;

/**
 * Compiles a script using the {@link NashornScriptEngine} and constructs a {@link NashornView} to execute it.
 */
public class NashornViewResolver extends ScriptEngineViewResolver {
    protected NashornViewResolver(ObjectMapper mapper, ViewCache cache, List viewCandidateEnumerators,
                                  Collection viewNamePatterns, String prefix, String suffix, Class resourceClass,
                                  ScriptEngineManager scriptEngineManager, String scriptEngineName, String renderObject, String renderFunction) {
        super(mapper, cache, viewCandidateEnumerators, viewNamePatterns, prefix, suffix, resourceClass, scriptEngineManager, scriptEngineName, renderObject, renderFunction);
    }

    @Override
    protected View createView(ScriptEngine scriptEngine, Reader scriptReader) throws Exception {
        return new NashornView(scriptEngine, IOUtils.toString(scriptReader), renderObject, renderFunction, mapper);
    }

    public static Builder builder() {
        return new Builder()
            .withScriptEngineName("nashorn")
            .withSuffix(".js");
    }

    public static class Builder extends ScriptEngineViewResolver.Builder {
        public NashornViewResolver build() {
            return new NashornViewResolver(mapper, cache, viewCandidateEnumerators, viewNamePatterns, prefix, suffix,
                resourceClass, scriptEngineManager, scriptEngineName, renderObject, renderFunction);
        }
    }
}