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A Network Stack for pCloud's API written in Java
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/*
 * Copyright (c) 2017 pCloud AG
 *
 * Licensed 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.pcloud.networking.api;

import com.pcloud.networking.client.Request;
import com.pcloud.utils.Types;

import java.io.IOException;
import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.lang.reflect.Type;

class DirectApiMethod extends ApiMethod {

    static final ApiMethod.Factory FACTORY = new Factory();

    private static class Factory extends ApiMethod.Factory {

        @Override
        public ApiMethod create(ApiComposer composer,
                                   Method method, Type[] argumentTypes,
                                   Annotation[][] argumentAnnotations) {
            Class returnType = Types.getRawType(method.getReturnType());
            if (!isAllowedResponseType(returnType)) {
                return null;
            }

            String apiMethodName = parseMethodNameAnnotation(method);
            checkMethodThrowsExceptions(method, IOException.class);

            RequestAdapter requestAdapter = getRequestAdapter(composer, method, argumentTypes, argumentAnnotations);
            ResponseAdapter returnTypeAdapter = getResponseAdapter(composer, method, returnType);

            return new DirectApiMethod<>(apiMethodName, requestAdapter, returnTypeAdapter);
        }
    }

    private final String apiMethodName;
    private final RequestAdapter requestAdapter;
    private final ResponseAdapter responseAdapter;

    private DirectApiMethod(String apiMethodName, RequestAdapter requestAdapter, ResponseAdapter responseAdapter) {
        this.apiMethodName = apiMethodName;
        this.requestAdapter = requestAdapter;
        this.responseAdapter = responseAdapter;
    }

    @Override
    public T invoke(ApiComposer apiComposer, Object[] args) throws IOException {
        Request.Builder builder = Request.create().methodName(apiMethodName);
        requestAdapter.adapt(builder, args);

        com.pcloud.networking.client.Call rawCall = apiComposer.apiClient().newCall(builder.build());
        ApiClientCall call = new ApiClientCall<>(apiComposer, rawCall, responseAdapter);
        return call.execute();
    }
}