Question

我正在尝试在mvel脚本中创建一个新对象。我有一个名为 Entity 的类，该类对类型为 StatusReasonParameters 的变量的引用。我想填充要传递给MVEL表达式的整个Entity类对象。如果我在表达式中执行 new StatusReasonParameters（），则会出现以下错误 错误：未知类或非法声明：org.mvel2.ParserContext sts = new StatusReasonParameters（）。我还尝试过通过 ParserContext 导入类，也尝试过使用StatusReasonParameters.class.newInstance（），但无济于事。如果无法添加新实例，那么新的HashMap（）会如何工作？

public class Entity {

    private String id;

    private EntityStatus status;

    private StatusReasonParameters statusReasonParameters;

}

public class StatusReasonParameters {

    private String reason;
    private String explanation;

}

MVEL expression

if(null != name) {
    entity.name = name;
}
if(null != status) {
    entity.status = status;
    entity.status(EntityStatus.valueOf(status));
}

if(null != statusReason) {
    sts =  new StatusReasonParameters();
    sts.reason = statusReason;

    entity.statusReasonParameters = sts;
}

fieldsData = new HashMap(); 
if(null != outletName) {
    outlets = [];
    outletData1 = [];
    outletData1.name = outletName;
    if(null != outletRegion) {
       outletData1.outletRegion = outletRegion; 
    }
    outlets[0] = outletData1;
}
bs = new BasicDBObject(fieldsData);
entity.fields = bs;

Here is the main method

Map<String,Object> map = new HashMap<>();
map.put("name", "nitin");
map.put("status", "DRAFT");
map.put("statusReason", "BHOT BADIYA");
map.put("statusExplanation", "explanation is this");
map.put("outletName", "outlet1");
map.put("outletRegion", "lucknow");
map.put("entity", entity);

ParserContext parseContext = new ParserContext();
parseContext.addImport(StatusReasonParameters.class);
parseContext.addImport(BasicDBObject.class);
parseContext.addImport(EntityStatus.class);

String expression = "new HashMap();if(null != name) {\\r\\n  entity.name = name;\\r\\n}\\r\\nif(null != status) {\\r\\n  entity.status = status;\\r\\n  entity.status(EntityStatus.valueOf(status));\\r\\n}\\r\\n\\r\\nif(null != statusReason) {\\r\\n    sts = StatusReasonParameters.class.newInstance();\\r\\n    sts.reason = statusReason;\\r\\nentity.statusReasonParameters = sts;\\r\\n}\\r\\nfieldsData = new HashMap(); \\r\\nif(null != outletName) {\\r\\n    outlets = [];\\r\\n    outletData1 = [];\\r\\n    outletData1.name = outletName;\\r\\nif(null != outletRegion) {\\r\\noutletData1.outletRegion = outletRegion; \\r\\n}\\r\\n    outlets[0] = outletData1;\\r\\n}\\r\\nbs = new BasicDBObject(fieldsData);\\r\\nentity.fields = bs;"; 
Serializable com = MVEL.compileExpression(expression,parseContext);
MVEL.executeExpression(com, map);
System.out.print(entity);

在mvel表达式中创建一个新对象

0 个答案: