io.knotx.mocks.knot.KnotContextKeys.java Source code

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Here is the source code for io.knotx.mocks.knot.KnotContextKeys.java

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/*
 * Copyright (C) 2016 Cognifide Limited
 *
 * 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 io.knotx.mocks.knot;

import io.knotx.dataobjects.ClientResponse;
import io.knotx.dataobjects.KnotContext;
import io.netty.handler.codec.http.HttpResponseStatus;
import io.vertx.core.file.OpenOptions;
import io.vertx.core.json.JsonObject;
import io.vertx.rxjava.core.buffer.Buffer;
import io.vertx.rxjava.core.file.AsyncFile;
import io.vertx.rxjava.core.file.FileSystem;
import java.util.Optional;
import org.apache.commons.lang3.tuple.Pair;
import rx.Observable;
import rx.Single;

enum KnotContextKeys {
    RESPONSE("clientResponse") {
        @Override
        Optional<Object> defaultValue(KnotContext context) {
            return Optional.of(new ClientResponse().setStatusCode(HttpResponseStatus.OK.code()));
        }
    },
    REQUEST("clientRequest") {
        @Override
        Optional<Object> defaultValue(KnotContext context) {
            return context.getClientRequest() != null ? Optional.of(context.getClientRequest()) : Optional.empty();
        }
    },
    FRAGMENTS("fragments") {
        @Override
        Optional<Object> defaultValue(KnotContext context) {
            return Optional.ofNullable(context.getFragments());
        }
    },
    TRANSITION("transition") {
        @Override
        Observable<Optional<Object>> mockValue(FileSystem fileSystem, String mockConfigValue) {
            return Observable.just(Optional.of(mockConfigValue));
        }

        @Override
        Optional<Object> defaultValue(KnotContext context) {
            return Optional.empty();
        }
    };

    private final String key;

    KnotContextKeys(String key) {
        this.key = key;
    }

    String key() {
        return key;
    }

    Observable<Pair<String, Optional<Object>>> valueOrDefault(FileSystem fileSystem, JsonObject responseConfig,
            KnotContext context) {
        return Observable.just(key).filter(responseConfig::containsKey)
                .flatMap(contextKey -> this.mockValue(fileSystem, responseConfig.getString(contextKey)))
                .map(value -> Pair.of(key, value)).defaultIfEmpty(Pair.of(key, this.defaultValue(context)));
    }

    Observable<Optional<Object>> mockValue(FileSystem fileSystem, String resourcePath) {
        return fileSystem.rxOpen(resourcePath, new OpenOptions().setCreate(false).setWrite(false))
                .flatMap(this::processFile).map(this::toJson).toObservable();
    }

    abstract Optional<Object> defaultValue(KnotContext context);

    private Optional<Object> toJson(Buffer buffer) {
        return Optional
                .of(buffer.toString().trim().charAt(0) == '{' ? buffer.toJsonObject() : buffer.toJsonArray());
    }

    private Single<Buffer> processFile(final AsyncFile asyncFile) {
        return Observable.just(Buffer.buffer()).mergeWith(asyncFile.toObservable()).reduce(Buffer::appendBuffer)
                .toSingle();
    }
}