Error executing code: ListIterator with parameter

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Posted on by mohammed.mqi

2,050

Greeting everyon

i've created a new report and it's works fine

but when i didn't put parameter it's give me error

and that parameter i want it not requires to apply my report

here the error showing me how can i ignore that parameter if null?

[SysEntryPointAttribute]
public void processReport()
{
    Query                   query;
    QueryRun                queryRun;
    AssetGroup              assetGroup;
    QueryBuildDataSource    qbdsAssetGroup;
    ListIterator            groupListIterator;

    date fromDate,toDate;


    contract = this.parmDataContract() as FixedAssetTransReportContract;

    fromDate=contract.parmFromDate();
    toDate=contract.parmToDate();


     groupListIterator = new ListIterator(contract.parmFixedAssetGroup());
    query = new Query(queryStr(QueryAssetGroup));
    qbdsAssetGroup = query.dataSourceTable(tableNum(AssetGroup));

    while(groupListIterator.more())
    {
        qbdsAssetGroup.addRange(
            fieldNum(AssetGroup, GroupId)).value(groupListIterator.value());
        groupListIterator.next();
    }

    queryRun = new QueryRun(query);

    while(queryRun.next())
    {
        assetGroup = queryRun.get(tableNum(assetGroup));
        this.populateTmpTable(assetGroup.GroupId,fromDate,fromDate);
    }



}

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nmaenpaa 101,160 Moderator on at

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You need to check what contract.parmFixedAssetGroup() returns before trying to assign it to ListIterator.

If you have null instead of a list, you should not try to initialize ListIterator.

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Martin Dráb 237,912 Most Valuable Professional on at

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Also, what if you use ListEnumerator instead of ListIterator? That's the usual way. For example:

ListEnumerator enumerator; if (contract.parmFixedAssetGroup()) { enumerator = contract.parmFixedAssetGroup().getEnumerator(); while (enumerator.moveNext()) { qbdsAssetGroup.addRange(fieldNum(AssetGroup, GroupId)).value(queryValue(enumerator.current())); } }

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mohammed.mqi 2,050 on at

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thanks for replay

i solved by also this way

if(contract.parmFixedAssetGroup()) { groupListIterator = new ListIterator(contract.parmFixedAssetGroup()); query = new Query(queryStr(QueryAssetGroup)); qbdsAssetGroup = query.dataSourceTable(tableNum(AssetGroup)); while(groupListIterator.more()) { qbdsAssetGroup.addRange( fieldNum(AssetGroup, GroupId)).value(groupListIterator.value()); groupListIterator.next(); } } else { query = new Query(queryStr(QueryAssetGroup)); }

do you think that is also good way if i have many parameters with ListIterator

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nmaenpaa 101,160 Moderator on at

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Yes, it's a "good way" to check whether your list is null before assigning it to iterator or enumerator. You should always do it so it's a good approach, no matter if you have 1 or 100 parameters / lists.

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Martin Dráb 237,912 Most Valuable Professional on at

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All right, so it seems that your problem was indeed in parmFixedAssetGroup() returning null. Another solution of this problem is having the list always initialized - then the caller code doesn't have to worry about this validation and you won't get errors like this.

By the way, what is your reason for preferring iterators? Enumerators require less code and they - unlike iterators - work even if you iterate a collection on another tier. That's why they're the recommended choice.

Having many collections in a contract isn't any problem from technical point of view. If it works for your business requirements and user experience, then it's fine.

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