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Core functionality for Status Machina, a small, simple and pragmatic state machine for resilient microservices orchestration.

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/*
 *
 * Copyright 2019 <---> Present Status Machina Contributors (https://github.com/entzik/status-machina/graphs/contributors)
 *
 * 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
 *
 * This software 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.statusmachina.core;

import com.google.common.collect.ImmutableMap;
import io.statusmachina.core.api.MachineDefinition;
import io.statusmachina.core.api.Machine;
import io.statusmachina.core.api.MachineBuilder;

import java.util.Map;

public class MachineInstanceBuilderImpl implements MachineBuilder {
    private MachineDefinition definition;
    private ImmutableMap context;
    private String id;

    @Override
    public  MachineBuilder ofType(MachineDefinition definition) {
        this.definition = definition;
        return this;
    }

    @Override
    public  MachineBuilder withContext(Map context) {
        this.context = ImmutableMap.builder().putAll(context).build();
        return this;
    }

    @Override
    public  MachineBuilder withId(String id) {
        this.id = id;
        return this;
    }

    @Override
    public  Machine build() throws TransitionException {
        if (definition == null)
            throw new IllegalStateException("a state machine definition must be provided in order for a state machine instance to be built");
        if (context == null)
            throw new IllegalStateException("a context must be provided in order for a state machine instance to be built");
        if (id == null)
            return new MachineInstanceImpl((MachineDefinition) definition, context);
        else
            return new MachineInstanceImpl((MachineDefinition) definition, id, context);
    }
}