com.shigengyu.hyperion.core.WorkflowDefinition.java Source code

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/*******************************************************************************
 * Copyright 2013-2014 Gengyu Shi
 *
 * 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.shigengyu.hyperion.core;

import java.io.IOException;

import net.jcip.annotations.Immutable;

import org.springframework.util.StringUtils;

import com.hazelcast.nio.ObjectDataInput;
import com.hazelcast.nio.ObjectDataOutput;
import com.hazelcast.nio.serialization.DataSerializable;
import com.shigengyu.common.StringMessage;
import com.shigengyu.hyperion.entities.WorkflowDefinitionEntity;

@Immutable
public abstract class WorkflowDefinition implements DataSerializable {

    private final WorkflowState initialState;

    private final String name;

    private final Class<? extends WorkflowContext> workflowContextType;

    private final String workflowDefinitionId;

    private final Class<? extends WorkflowDefinition> workflowDefinitionType;

    protected WorkflowDefinition() {
        final Class<? extends WorkflowDefinition> clazz = this.getClass();
        final Workflow workflow = clazz.getAnnotation(Workflow.class);
        if (workflow == null) {
            final String message = StringMessage.with(
                    "Workflow definition class [{}] does not have @Workflow annotation present", clazz.getName());
            throw new WorkflowDefinitionException(message);
        }

        workflowDefinitionId = workflow.id();
        workflowDefinitionType = clazz;
        name = StringUtils.isEmpty(workflow.name()) ? clazz.getSimpleName() : workflow.name();
        initialState = WorkflowState.of(workflow.initialState());
        workflowContextType = workflow.contextType() == null ? WorkflowContext.class : workflow.contextType();
    }

    @Override
    public boolean equals(Object obj) {
        if (!(obj instanceof WorkflowDefinition)) {
            return false;
        }

        WorkflowDefinition other = (WorkflowDefinition) obj;
        return workflowDefinitionId.equals(other.workflowDefinitionId);
    }

    public WorkflowState getInitialState() {
        return initialState;
    }

    public String getName() {
        return name;
    }

    public Class<? extends WorkflowContext> getWorkflowContextType() {
        return workflowContextType;
    }

    public String getWorkflowDefinitionId() {
        return workflowDefinitionId;
    }

    public Class<? extends WorkflowDefinition> getWorkflowDefinitionType() {
        return workflowDefinitionType;
    }

    @Override
    public int hashCode() {
        return workflowDefinitionId.hashCode();
    }

    @Override
    public void readData(ObjectDataInput in) throws IOException {
    }

    public WorkflowDefinitionEntity toEntity() {
        WorkflowDefinitionEntity entity = new WorkflowDefinitionEntity();
        entity.setWorkflowDefinitionId(workflowDefinitionId);
        entity.setName(name);
        return entity;
    }

    @Override
    public String toString() {
        return name;
    }

    @Override
    public void writeData(ObjectDataOutput out) throws IOException {
    }
}