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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.mapper.guard;

import com.amazon.ask.dispatcher.request.handler.HandlerInput;
import com.amazon.ask.mvc.mapper.HasPriority;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.function.Predicate;

import static com.amazon.ask.util.ValidationUtils.assertNotNull;

/**
 *
 */
public abstract class Guard implements HasPriority {
    protected final Logger logger = LoggerFactory.getLogger(getClass());

    protected final T delegate;
    protected final Predicate predicate;
    protected final int priority;

    public Guard(T delegate, Predicate predicate, int priority) {
        this.delegate = assertNotNull(delegate, "delegate");
        this.predicate = assertNotNull(predicate, "predicate");
        this.priority = priority;
    }

    @Override
    public int getPriority() {
        return priority;
    }

    public static abstract class Builder, T, D extends Guard> {
        protected T delegate;
        protected Predicate predicate;
        protected int priority;

        protected Builder() {
        }

        public Self withDelegate(T delegate) {
            this.delegate = delegate;
            return getThis();
        }

        public Self withPredicate(Predicate predicate) {
            this.predicate = predicate;
            return getThis();
        }

        public Self withPriority(int priority) {
            this.priority = priority;
            return getThis();
        }

        @SuppressWarnings("unchecked")
        protected Self getThis() {
            return (Self) this;
        }

        public abstract D build();
    }
}