com.dell.cpsd.hdp.capability.registry.client.binder.CapabilityMatcher Maven / Gradle / Ivy

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This repository contains the source code for the capability registry API. This API exposes the interface through which a consumer or provider interacts with the capability registry.
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/**
 * Copyright © 2017 Dell Inc. or its subsidiaries. All Rights Reserved.
 * Dell EMC Confidential/Proprietary Information
 */

package com.dell.cpsd.hdp.capability.registry.client.binder;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.function.Predicate;

import com.dell.cpsd.hdp.capability.registry.api.Capability;
import com.dell.cpsd.hdp.capability.registry.api.CapabilityProvider;
import com.dell.cpsd.hdp.capability.registry.api.ProviderEndpoint;
import com.dell.cpsd.hdp.capability.registry.client.helper.AmqpProviderEndpointHelper;

/**
 * 
 * Copyright © 2017 Dell Inc. or its subsidiaries.  All Rights Reserved.
 * Dell EMC Confidential/Proprietary Information
 * 
 *
 * @since 1.0
 */
public class CapabilityMatcher
{
    /**
     * The ability to match on all or any capability.
     */
    public enum CardinalReduction
    {
        ALL,
        ANY;
    }

    private String            profile             = null;
    private String            requestMessageType  = null;
    private String            responseMessageType = null;
    private String            eventMessageType    = null;
    private CardinalReduction cardinalReduction   = CardinalReduction.ANY;

    /**
     * Builder method for profile
     * 
     * @param profile
     *            The profile name
     * @return The capability matcher with the profile name
     */
    public CapabilityMatcher withProfile(String profile)
    {
        this.profile = profile;
        return this;
    }

    /**
     * Builder method for cardinal reduction
     * 
     * @param cardinalReduction
     *            The cardinal reduction
     * @return The capability matcher with the cardinal reduction
     */
    public CapabilityMatcher withCardinalReduction(CardinalReduction cardinalReduction)
    {
        this.cardinalReduction = cardinalReduction;
        return this;
    }

    /**
     * Builder method for request type
     * 
     * @param messageType
     *            The message type
     * @return The capability matcher with the request message type
     */
    public CapabilityMatcher withRequestMessageType(String messageType)
    {
        this.requestMessageType = messageType;
        return this;
    }

    /**
     * Builder method for response type
     * 
     * @param messageType
     *            The message type
     * @return The capability matcher with the response message type
     */
    public CapabilityMatcher withResponseMessageType(String messageType)
    {
        this.responseMessageType = messageType;
        return this;
    }

    /**
     * Builder method for event type
     * 
     * @param messageType
     *            The message type
     * @return The capability matcher with the event message type
     */
    public CapabilityMatcher withEventMessageType(String messageType)
    {
        this.eventMessageType = messageType;
        return this;
    }

    /**
     * Match capabilities from the providers
     * 
     * @param providers
     *            The capability provider list
     * @return The capability data list matched
     */
    public List match(List providers)
    {
        ProviderEndpointFilter providerEndpointFilter = new ProviderEndpointFilter().withRequestMessageType(requestMessageType)
                .withResponseMessageType(responseMessageType).withEventMessageType(eventMessageType);

        CapabilityFilter capabilityFilter = new CapabilityFilter().withProfile(profile).withProviderEndpointFiler(providerEndpointFilter);

        final List capabilityDatas = new ArrayList<>();
        if (providers != null)
        {
            for (CapabilityProvider provider : providers)
            {
                if (provider.getCapabilities() != null)
                {
                    List capabilities = provider.getCapabilities();
                    if (capabilities != null)
                    {
                        for (Capability capability : capabilities)
                        {
                            if (capabilityFilter.test(capability))
                            {
                                capabilityDatas.add(new CapabilityData(provider, capability));
                            }
                        }
                    }
                }
            }
        }

        switch (cardinalReduction)
        {
            case ALL:
            {
                return capabilityDatas;
            }
            case ANY:
            {
                if (capabilityDatas.size() > 0)
                {
                    return Arrays.asList(capabilityDatas.iterator().next());
                }
            }
        }

        return Collections.emptyList();
    }

    private class CapabilityFilter implements Predicate
    {
        private String                 profile;
        private ProviderEndpointFilter providerEndpointFilter;

        public CapabilityFilter withProfile(String profile)
        {
            this.profile = profile;
            return this;
        }

        public CapabilityFilter withProviderEndpointFiler(ProviderEndpointFilter providerEndpointFilter)
        {
            this.providerEndpointFilter = providerEndpointFilter;
            return this;
        }

        @Override
        public boolean test(Capability capability)
        {
            boolean matched = true;
            if (capability.getProviderEndpoint() == null)
            {
                matched = false;
            }

            if (matched)
            {
                if (providerEndpointFilter != null)
                {
                    matched = providerEndpointFilter.test(capability.getProviderEndpoint());
                }
            }

            if (matched)
            {
                if (profile != null)
                {
                    matched = profile.equalsIgnoreCase(capability.getProfile());
                }
            }

            return matched;
        }
    }

    private class ProviderEndpointFilter implements Predicate
    {
        private String requestMessageType  = null;
        private String responseMessageType = null;
        private String eventMessageType    = null;

        /**
         * Builder method for request type
         * 
         * @param messageType
         *            The message type
         * @return The provider endpoint filter with the request message type
         */
        public ProviderEndpointFilter withRequestMessageType(String messageType)
        {
            this.requestMessageType = messageType;
            return this;
        }

        /**
         * Builder method for response type
         * 
         * @param messageType
         *            The message type
         * @return The provider endpoint filter with the response message type
         */
        public ProviderEndpointFilter withResponseMessageType(String messageType)
        {
            this.responseMessageType = messageType;
            return this;
        }

        /**
         * Builder method for event type
         * 
         * @param messageType
         *            The message type
         * @return The provider endpoint filter with the event message type
         */
        public ProviderEndpointFilter withEventMessageType(String messageType)
        {
            this.eventMessageType = messageType;
            return this;
        }

        @Override
        public boolean test(ProviderEndpoint endpoint)
        {
            AmqpProviderEndpointHelper endpointHelper = new AmqpProviderEndpointHelper(endpoint);

            boolean matched = true;
            if (requestMessageType != null)
            {
                matched = requestMessageType.equals(endpointHelper.getRequestMessageType());
            }

            if (matched)
            {
                if (responseMessageType != null)
                {
                    matched = responseMessageType.equals(endpointHelper.getResponseMessageType());
                }
            }

            if (matched)
            {
                if (eventMessageType != null)
                {
                    matched = eventMessageType.equals(endpointHelper.getEventMessageType());
                }
            }

            return matched;
        }
    }
}