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Azkarra Streams Core API
There is a newer version: 0.9.2
/*
 * Copyright 2019-2021 StreamThoughts.
 *
 * 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 io.streamthoughts.azkarra.api;

import io.streamthoughts.azkarra.api.config.Conf;
import io.streamthoughts.azkarra.api.providers.TopologyDescriptor;
import io.streamthoughts.azkarra.api.streams.TopologyProvider;
import io.streamthoughts.azkarra.api.util.Version;

import java.util.Objects;
import java.util.Optional;

public class StreamsTopologyMeta {

    private final String name;
    private final Version version;
    private final String description;
    private final Class type;
    private final ClassLoader classLoader;
    private final Conf conf;

    /**
     * Creates a new {@link StreamsTopologyMeta} instance.
     *
     * @param name        the name of the topology.
     * @param version     the version of the topology
     * @param description the description of the topology.
     * @param type        the topology {@link Class}.
     * @param classLoader the topology {@link ClassLoader}.
     * @param conf        the default {@link Conf} for the topology.
     */
    private StreamsTopologyMeta(final String name,
                                final Version version,
                                final String description,
                                final Class type,
                                final ClassLoader classLoader,
                                final Conf conf) {
        this.name = Objects.requireNonNull(name, "name should not be null");
        this.version = Objects.requireNonNull(version, "version should not be null");
        this.type = Objects.requireNonNull(type, "version should not be null");
        this.classLoader = Objects.requireNonNull(classLoader, "classLoader should not be null");
        this.conf = Objects.requireNonNull(conf, "conf should not be null");
        this.description = description;
    }

    public String name() {
        return name;
    }

    public Version version() {
        return version;
    }

    public Class type() {
        return type;
    }

    public String description() {
        return description;
    }

    public Conf configuration() {
        return conf;
    }

    public ClassLoader classLoader() {
        return classLoader;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (!(o instanceof StreamsTopologyMeta)) return false;
        StreamsTopologyMeta that = (StreamsTopologyMeta) o;
        return Objects.equals(name, that.name) &&
                Objects.equals(version, that.version) &&
                Objects.equals(description, that.description) &&
                Objects.equals(type, that.type) &&
                Objects.equals(classLoader, that.classLoader) &&
                Objects.equals(conf, that.conf);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public int hashCode() {
        return Objects.hash(name, version, description, type, classLoader, conf);
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public String toString() {
        return "StreamTopologyMeta{" +
                "name='" + name + '\'' +
                ", version=" + version +
                ", description='" + description + '\'' +
                ", type=" + type +
                ", classLoader=" + classLoader +
                ", conf=" + conf +
                '}';
    }

    /**
     * Helper method to create a new {@link Builder} instance.
     *
     * @return a new {@link Builder} instance
     */
    public static Builder create() {
        return new Builder();
    }

    public static class Builder {

        private String name;
        private Version version;
        private String description;
        private Class type;
        private ClassLoader classLoader;
        private Conf conf;

        public Builder from(final TopologyDescriptor descriptor) {
            return this
                    .setName(descriptor.name())
                    .setVersion(descriptor.version())
                    .setDescription(descriptor.description())
                    .setType(descriptor.type())
                    .setClassLoader(descriptor.classLoader())
                    .setConf(descriptor.configuration());
        }

        public Builder setName(final String name) {
            this.name = Objects.requireNonNull(name, "name should not be null");
            return this;
        }

        public Builder setVersion(final Version version) {
            this.version = Objects.requireNonNull(version, "version should not be null");
            ;
            return this;
        }

        public Builder setDescription(final String description) {
            this.description = description;
            return this;
        }

        public Builder setType(final Class type) {
            this.type = Objects.requireNonNull(type, "type should not be null");
            ;
            return this;
        }

        public Builder setClassLoader(final ClassLoader classLoader) {
            this.classLoader = classLoader;
            return this;
        }

        public Builder setConf(final Conf conf) {
            this.conf = conf;
            return this;
        }

        public StreamsTopologyMeta build() {
            return new StreamsTopologyMeta(
                    name,
                    version,
                    description,
                    type,
                    Optional.ofNullable(classLoader).orElse(type.getClassLoader()),
                    Optional.ofNullable(conf).orElse(Conf.empty())
            );
        }
    }
}