Flowable源码注释（五十九）抽象行为工厂类_flowable defaultexpressionmanager-优快云博客

本文详细探讨Flowable-6.7.2中AbstractBehaviorFactory的实现，包括其作为行为工厂的角色，如何使用内部的表达式管理器将FieldExtension转换为FieldDeclaration。

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Flowable-6.7.2 源码注释地址：https://github.com/solojin/flowable-6.7.2-annotated

AbstractBehaviorFactory 抽象行为工厂类

内部持有表达式管理器，主要负责将FieldExtension类型的集合转化为FieldDeclaration类型的集合

package org.flowable.engine.impl.bpmn.parser.factory;

import java.util.ArrayList;
import java.util.List;

import org.apache.commons.lang3.StringUtils;
import org.flowable.bpmn.model.FieldExtension;
import org.flowable.common.engine.api.delegate.Expression;
import org.flowable.common.engine.impl.el.ExpressionManager;
import org.flowable.engine.impl.bpmn.parser.FieldDeclaration;
import org.flowable.engine.impl.el.FixedValue;

/**
 * 抽象行为工厂类
 * 内部持有表达式管理器，主要负责将FieldExtension类型的集合转化为FieldDeclaration类型的集合
 *
 * @author Joram Barrez
 */
public abstract class AbstractBehaviorFactory {

    protected ExpressionManager expressionManager;

    public List<FieldDeclaration> createFieldDeclarations(List<FieldExtension> fieldList) {
        List<FieldDeclaration> fieldDeclarations = new ArrayList<>();

        for (FieldExtension fieldExtension : fieldList) {
            FieldDeclaration fieldDeclaration = null;
            if (StringUtils.isNotEmpty(fieldExtension.getExpression())) {
                fieldDeclaration = new FieldDeclaration(fieldExtension.getFieldName(), Expression.class.getName(), expressionManager.createExpression(fieldExtension.getExpression()));
            } else {
                fieldDeclaration = new FieldDeclaration(fieldExtension.getFieldName(), Expression.class.getName(), new FixedValue(fieldExtension.getStringValue()));
            }

            fieldDeclarations.add(fieldDeclaration);
        }
        return fieldDeclarations;
    }

    public ExpressionManager getExpressionManager() {
        return expressionManager;
    }

    public void setExpressionManager(ExpressionManager expressionManager) {
        this.expressionManager = expressionManager;
    }

}