package nv.analyzer;

import nv.data.DataStore;

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

/**
 * 分析方法工厂,通过组合分析方法产生分析链,和执行分析链产生最终分析结果. (创建者模式)
 * 正常应该把执行链独立出来一个类,但是要求说要放在一起.
 * 先执行创建,然后附加分析方法,最后执行分析.
 */
public class AnalyzerBuilder {
    private List<AnalyzerMethod> analyzerMethodLinks;
    
    private AnalyzerBuilder() {
    }
    
    
    public static AnalyzerBuilder createAnalyzerLinks() {
        AnalyzerBuilder analyzerBuilder = new AnalyzerBuilder();
        analyzerBuilder.analyzerMethodLinks = new ArrayList<AnalyzerMethod>();
        return analyzerBuilder;
    }
    
    
    public AnalyzerBuilder append(AnalyzerMethod analyzerMethod) {
        analyzerMethodLinks.add(analyzerMethod);
        return this;
    }
    
    public AnalyzerBuilder insert(AnalyzerMethod analyzerMethod, int index) {
        analyzerMethodLinks.add(index, analyzerMethod);
        return this;
    }
    
    /**
     * 构造仓库数据分析者
     *
     * @return
     */
    public StoreDataAnalyzer build() {
        return new StoreDataAnalyzer() {
            @Override
            public DataStore analy(DataStore dataStore) {
                
                DataStore result = null;
                
                for (int i = 0; i < analyzerMethodLinks.size(); i++) {
                    result = analyzerMethodLinks.get(i).execute(result == null ? dataStore : result);
                }
                
                return result;
            }
        };
        
    }
    
}