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    • ars.database.spring.EntityFactoryBean Maven / Gradle / Ivy

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    package ars.database.spring;

import java.util.Map;
import java.util.List;

import org.springframework.beans.factory.FactoryBean;

import ars.util.Beans;
import ars.database.repository.Query;
import ars.database.repository.Repositories;

/**
 * 对象实体工厂类
 *
 * @author wuyongqiang
 */
public class EntityFactoryBean implements FactoryBean {
    private Object entity; // 模型实体（设置表示默认值）
    private boolean loaded; // 实体是否已加载
    private Class model; // 对象模型
    private boolean multiple; // 是否获取多个
    private Map attributes; // 实体属性

    public Class getModel() {
        return model;
    }

    public void setModel(Class model) {
        this.model = model;
    }

    public boolean isMultiple() {
        return multiple;
    }

    public void setMultiple(boolean multiple) {
        this.multiple = multiple;
    }

    public Map getAttributes() {
        return attributes;
    }

    public void setAttributes(Map attributes) {
        this.attributes = attributes;
    }

    @Override
    public Object getObject() throws Exception {
        if (!this.loaded) {
            if (this.model == null) {
                throw new IllegalStateException("Model not initialized");
            }
            if (this.attributes == null || this.attributes.isEmpty()) {
                throw new IllegalStateException("Attributes not initialized");
            }
            this.loaded = true;
            Query query = Repositories.query(this.model).custom(this.attributes);
            if (this.multiple) {
                List objects = query.list();
                if (Beans.isEmpty(this.entity) || !objects.isEmpty()) {
                    this.entity = objects;
                }
            } else {
                Object object = query.single();
                if (Beans.isEmpty(this.entity) || object != null) {
                    this.entity = object;
                }
            }
        }
        return this.entity;
    }

    @Override
    public Class getObjectType() {
        return this.multiple ? List.class : this.model;
    }

    @Override
    public boolean isSingleton() {
        return true;
    }

}
    
    
    
    

    




    
    
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