com.github.woonsan.katharsis.invoker.KatharsisInvokerBuilder.java Source code

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 com.github.woonsan.katharsis.invoker;

import io.katharsis.dispatcher.RequestDispatcher;
import io.katharsis.dispatcher.registry.ControllerRegistry;
import io.katharsis.dispatcher.registry.ControllerRegistryBuilder;
import io.katharsis.errorhandling.mapper.ExceptionMapperRegistry;
import io.katharsis.errorhandling.mapper.ExceptionMapperRegistryBuilder;
import io.katharsis.jackson.JsonApiModuleBuilder;
import io.katharsis.locator.JsonServiceLocator;
import io.katharsis.resource.ResourceInformationBuilder;
import io.katharsis.resource.registry.ResourceRegistry;
import io.katharsis.resource.registry.ResourceRegistryBuilder;
import io.katharsis.utils.parser.TypeParser;

import com.fasterxml.jackson.databind.Module;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.module.SimpleModule;

/**
 * KatharsisInvoker builder.
 */
public class KatharsisInvokerBuilder {

    private ObjectMapper objectMapper;
    private ResourceRegistry resourceRegistry;
    private RequestDispatcher requestDispatcher;
    private JsonServiceLocator jsonServiceLocator;
    private ExceptionMapperRegistry exceptionMapperRegistry;

    private String resourceSearchPackage;
    private String resourceDefaultDomain;

    public KatharsisInvokerBuilder objectMapper(ObjectMapper objectMapper) {
        this.objectMapper = objectMapper;
        return this;
    }

    public KatharsisInvokerBuilder resourceRegistry(ResourceRegistry resourceRegistry) {
        this.resourceRegistry = resourceRegistry;
        return this;
    }

    public KatharsisInvokerBuilder requestDispatcher(RequestDispatcher requestDispatcher) {
        this.requestDispatcher = requestDispatcher;
        return this;
    }

    public KatharsisInvokerBuilder jsonServiceLocator(JsonServiceLocator jsonServiceLocator) {
        this.jsonServiceLocator = jsonServiceLocator;
        return this;
    }

    public KatharsisInvokerBuilder exceptionMapperRegistry(ExceptionMapperRegistry exceptionMapperRegistry) {
        this.exceptionMapperRegistry = exceptionMapperRegistry;
        return this;
    }

    public KatharsisInvokerBuilder resourceSearchPackage(String resourceSearchPackage) {
        this.resourceSearchPackage = resourceSearchPackage;
        return this;
    }

    public KatharsisInvokerBuilder resourceDefaultDomain(String resourceDefaultDomain) {
        this.resourceDefaultDomain = resourceDefaultDomain;
        return this;
    }

    public KatharsisInvoker build() throws Exception {
        if (resourceRegistry == null || requestDispatcher == null || exceptionMapperRegistry == null) {
            if (resourceSearchPackage == null) {
                throw new IllegalArgumentException("Resrouce Search Package should not be null.");
            }

            if (resourceDefaultDomain == null) {
                throw new IllegalArgumentException("Resrouce Default Domain should not be null.");
            }
        }

        if (resourceRegistry == null) {
            if (jsonServiceLocator == null) {
                throw new IllegalArgumentException("JsonServiceLocator should be provided!");
            }

            resourceRegistry = buildResourceRegistry(jsonServiceLocator, resourceSearchPackage,
                    resourceDefaultDomain);
        }

        if (requestDispatcher == null) {
            if (exceptionMapperRegistry == null) {
                exceptionMapperRegistry = buildExceptionMapperRegistry(resourceSearchPackage);
            }

            requestDispatcher = createRequestDispatcher(resourceRegistry, exceptionMapperRegistry);
        }

        if (objectMapper == null) {
            objectMapper = createObjectMapper(resourceRegistry);
        }

        return new KatharsisInvoker(objectMapper, resourceRegistry, requestDispatcher);
    }

    protected ExceptionMapperRegistry buildExceptionMapperRegistry(String resourceSearchPackage) throws Exception {
        ExceptionMapperRegistryBuilder mapperRegistryBuilder = new ExceptionMapperRegistryBuilder();
        return mapperRegistryBuilder.build(resourceSearchPackage);
    }

    protected ResourceRegistry buildResourceRegistry(JsonServiceLocator jsonServiceLocator,
            String resourceSearchPackage, String resourceDefaultDomain) {
        ResourceRegistryBuilder registryBuilder = new ResourceRegistryBuilder(jsonServiceLocator,
                new ResourceInformationBuilder());
        return registryBuilder.build(resourceSearchPackage, resourceDefaultDomain);
    }

    protected RequestDispatcher createRequestDispatcher(ResourceRegistry resourceRegistry,
            ExceptionMapperRegistry exceptionMapperRegistry) throws Exception {
        ControllerRegistryBuilder controllerRegistryBuilder = new ControllerRegistryBuilder();
        TypeParser typeParser = new TypeParser();
        ControllerRegistry controllerRegistry = controllerRegistryBuilder.build(resourceRegistry, typeParser);
        return new RequestDispatcher(controllerRegistry, exceptionMapperRegistry);
    }

    protected ObjectMapper createObjectMapper(ResourceRegistry resourceRegistry) {
        ObjectMapper mapper = new ObjectMapper();
        mapper.registerModule(createDataBindingModule(resourceRegistry));
        return mapper;
    }

    protected Module createDataBindingModule(ResourceRegistry resourceRegistry) {
        JsonApiModuleBuilder jsonApiModuleBuilder = new JsonApiModuleBuilder();
        SimpleModule simpleModule = jsonApiModuleBuilder.build(resourceRegistry);
        return simpleModule;
    }
}