java - 将 Java 代码转换为 Groovy

Question

我正在尝试将 Java 函数转换为等效的 Groovy 代码，但我无法找到任何在循环中执行 && 操作的内容。谁能指导我......

到目前为止，这就是我得到的

public List getAlert(def searchParameters, def numOfResult) throws UnsupportedEncodingException
{
    List respList=null
    respList = new ArrayList()
    String[] searchStrings = searchParameters.split(",")
    try
    {
        for(strIndex in searchStrings)
        {
            IQueryResult result = search(searchStrings[strIndex])
            if(result!=null)
            {
                def count = 0

                /*The below line gives me error*/
                for(it in result.document && count < numOfResult)
                {

                }
            }
        }
    }   
    catch(Exception e)
    {
        e.printStackTrace()
    }
}

我的Java代码

public List getAlert(String searchParameters, int numOfResult) throws UnsupportedEncodingException
{
     List respList = null
     respList = new ArrayList()
     String[] searchStrings = searchParameters.split(",")
     try {
       for (int strIndex = 0; strIndex < searchStrings.length; strIndex++) {
         IQueryResult result = search(searchStrings[strIndex])
         if (result != null) {
           ListIterator it = result.documents()
           int count = 0
           while ((it.hasNext()) && (count < numOfResult)) {
             IDocumentSummary summary = (IDocumentSummary)it.next()

             if (summary != null) {

               String docid = summary.getSummaryField("infadocid").getStringValue()
               int index = docid.indexOf("#")
               docid = docid.substring(index + 1)


               String url = summary.getSummaryField("url").getStringValue()
               int i = url.indexOf("/", 8)
               String endURL = url.substring(i + 1, url.length())
               String body = summary.getSummaryField("infadocumenttitle").getStringValue()

               String frontURL = produrl + endURL
               String strURL
               strURL = frontURL
               strURL = body
               String strDocId 
               strDocId = frontURL
               strDocId = docid

               count++
             }
           }
         }
         result = null
       }
     } catch (Exception e) {
       e.printStackTrace()
       return respList
     }
     return respList
   }

Answer 1

在我看来就像

def summary = result.documents.first()
if (summary) {
           String docid = summary.getSummaryField("infadocid").getStringValue()
           ...
           strDocId = docid        
}

这就是您真正需要的，因为当您只想处理第一条记录时，for 循环实际上没有多大意义。

如果 result.documents 可能包含 null，则将 first() 替换为 find()

编辑:要处理多个结果:

def summaries = result.documents.take(numOfResult)

// above code assumes result.documents contains no nulls; otherwise:
//    def count=0
//    def summaries = result.documents.findAll { it && count++<numOfResult }

summaries.each { summary ->
           String docid = summary.getSummaryField("infadocid").getStringValue()
           ...
           strDocId = docid        
}

在惯用的 Groovy 代码中，许多循环被替换为迭代方法，例如 each()