Help - tbo cannot be cast to IDfType

Hello Community,

I am having trouble implementing my TBO. I have created the custom type "xa_content" that is a subtype of dm_document. The type has several string attributes that need to be converted to uppercase before being save/stored in the docbase. The strings can be variable length so the "UUUUUU" mask won't work here I also have a special case in which one of the attributes needs to be tested for uniqueness. Please see below the error message for my TBO implementation class.

I currently get the following error in Webtop after selecting my custom document type and then clicking Next:


An error has occurred.

invokeMethod() failed while calling: onNextComponent
com.mycompany.tbo.CustMetadata cannot be cast to com.documentum.fc.client.IDfType

After closing this window, press the Refresh or Reload button on your browser to continue.
Hide Details

Stack Trace:

java.lang.ClassCastException: com.mycompany.tbo.CustMetadata cannot be cast to com.documentum.fc.client.IDfType
at com.mycompany.tbo.CustMetadata.modifyAttributes(CustMetadata.java:66)
at com.mycompany.tbo.CustMetadata.doSave(CustMetadata.java:57)
at com.documentum.fc.client.DfPersistentObject.saveEx(DfPersistentObject.java:918)
at com.documentum.fc.client.DfPersistentObject.save(DfPersistentObject.java:913)
at com.mycompany.tbo.CustMetadata___PROXY.save(CustMetadata___PROXY.java)
at com.documentum.webcomponent.library.create.CreateService.createObject(CreateService.java:341)
at com.documentum.webcomponent.library.create.NewDocument.createNewObject(NewDocument.java:466)
at com.documentum.webcomponent.library.create.NewDocContainer.createObject(NewDocContainer.java:265)
at com.documentum.webcomponent.library.create.NewContainer.onNextComponent(NewContainer.java:153)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.documentum.web.form.FormProcessor.invokeMethod(FormProcessor.java:1652)
at com.documentum.web.form.FormProcessor.invokeMethod(FormProcessor.java:1506)
at com.documentum.web.form.FormProcessor.fireActionEvent(FormProcessor.java:1311)
at com.documentum.web.form.RecallOperation.execute(RecallOperation.java:101)
at com.documentum.web.form.FormProcessor.processAction(FormProcessor.java:120)
at com.documentum.web.form.FormAction.processAction(FormAction.java:107)
at com.documentum.web.env.WDKController.doStartRequest(WDKController.java:238)
at com.documentum.web.env.WDKController.processRequest(WDKController.java:124)
at com.documentum.web.env.WDKController.doFilter(WDKController.java:115)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:60)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.wrapRun(WebAppServletContext.java:3748)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:3714)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:120)
at weblogic.servlet.internal.WebAppServletContext.securedExecute(WebAppServletContext.java:2283)
at weblogic.servlet.internal.WebAppServletContext.execute(WebAppServletContext.java:2182)
at weblogic.servlet.internal.ServletRequestImpl.run(ServletRequestImpl.java:1491)
at weblogic.work.ExecuteThread.execute(ExecuteThread.java:256)
at weblogic.work.ExecuteThread.run(ExecuteThread.java:221)

This is my first attempt at coding a TBO, so any pointers would be much appreciated.


package com.mycompany.tbo;

import com.documentum.fc.client.DfDocument;
import com.documentum.fc.client.DfQuery;
import com.documentum.fc.client.IDfCollection;
import com.documentum.fc.client.IDfQuery;
import com.documentum.fc.client.IDfSession;
import com.documentum.fc.client.IDfSysObject;
import com.documentum.fc.client.IDfType;
import com.documentum.fc.common.DfException;
import com.documentum.fc.common.DfLogger;
import com.documentum.fc.common.IDfValue;

public class CustMetadata extends DfDocument implements ICustMetadata {

    public String getVendorString() {
        return "My Company";
    }

    public String getVersion() {
        return "1.0";
    }

    public boolean isCompatible(String arg0) {
        return false;
    }

    public boolean supportsFeature(String arg0) {
        return false;
    }

    public void setDoctype(String doctype) throws DfException {
        setString("xa_content", doctype);
    }
    
    public String getDoctype() throws DfException {
        return getString("xa_content");
    }

    protected synchronized void doSave(boolean saveLock, String versionLabel, Object[] extendedArgs)
            throws DfException { 
        
        DfLogger.info(this, "doSave called for object with id: {0}", new String [] {getObjectId().toString()}, null);
        
        ICustMetadata xaContent = (ICustMetadata) this;
        modifyAttributes(this.getSession(), xaContent);
        super.doSave(saveLock, versionLabel, extendedArgs);
    }

    /**
     * 
     * @param dfSession
     * @param metadataObj
     * @throws DfException
     */
    private void modifyAttributes(IDfSession dfSession, IDfSysObject metadataObj) throws DfException {
                
        for (int i = 0; i < metadataObj.getAttrCount(); i++){
            //Get the attribute's data type at current position
            int attrDataType = ((IDfType) metadataObj).getTypeAttrDataTypeAt(i);
            //Get attribute's type name at current position
            String attrName = ((IDfType) metadataObj).getTypeAttrNameAt(i);
            //Get attribute's value at current position
            IDfValue attrValue = metadataObj.getValueAt(i);
            //Is repeating attribute
            boolean repeat = ((IDfType) metadataObj).isTypeAttrRepeatingAt(i);
            //Test if the attribute's name contains "xa_"
            if (attrName.contains("xa_")){
                //Test if it's a string
                switch (attrDataType) {
                    case IDfType.DF_STRING:
                        setAttributeToUpper(repeat, attrName, attrValue, metadataObj);
                        break;
                    case IDfType.DF_UNDEFINED:
                        setAttributeToUpper(repeat, attrName, attrValue, metadataObj);
                        break;
                } //end switch
            }//end if
            //Special case -  xa_barcode is a string and repeating - test if unique
            if (attrName.equals("xa_barcode")){
                //Test for uniqueness
                findUniqueAttribute(attrName, attrValue, metadataObj);
            }
            
        }//end for
        
        
    }

    /**
     * Method to deal with repeating attributes. If the attribute repeats, then each attribute is changed to upper case.
     * Otherwise the single value is set to upper case.
     * @param IsRepeating
     * @param attrName
     * @param value
     * @param document
     */
    private void setAttributeToUpper(boolean isRepeating, String attrName, IDfValue value, IDfSysObject document) throws DfException {
        
        if (isRepeating){
            for (int i = 0; i < document.getValueCount(attrName); i++) {
                document.setRepeatingString(attrName, i, value.toString().toUpperCase());
                document.save();
            }//end for
        }
        else {
            document.setRepeatingString(attrName, 0, value.toString().toUpperCase());
            document.save();
        }
        
    }
    
    /**
     * Method to test if an attribute is unique and throws an exception if the value is not unique. Handles repeating attribute. 
     * @param attrName
     * @param attrValue
     * @param document
     */
    private void findUniqueAttribute(String attrName, IDfValue attrValue, IDfSysObject document) throws DfException {
        
        String docType = document.getTypeName();
        StringBuffer sbuf = new StringBuffer();
        sbuf.append("select count('" + attrName + "') as cnt " +
                "from '" + docType + "' where any '" + attrName + "' ='" + attrValue + "' " +
                "group by '" + attrName + "' having count('" + attrName + "') > 1 " +
                "order by '" + attrName + "' enable(row_based)");
                               
        IDfQuery query = new DfQuery();
        query.setDQL(sbuf.toString());
        IDfCollection collection = query.execute(document.getSession(), IDfQuery.EXECREAD_QUERY);
        if (collection.next()) {
            while (collection.next()) {
                int result = Integer.parseInt(collection.getRepeatingString("cnt", 1)); //cnt = the count column and 1 is the index value of the result which should always be 1 (returned 1 row).
                if (result > 1) {
                    attrValue = null;
                    document.save();
                    //throw warning
                    throw new IllegalArgumentException("The value " +attrValue+ "is not unique.");
                }
                document.save();
            }
        }
        collection.close();
     }

}

Thank you!

-Sean

Find more posts tagged with

Comments

PanfilovAB

Your code is so wrong that even if I suggest what is a root cause of java.lang.ClassCastException exception that will not help you, fortunately, you have enough guts to share you code - most forum idiots think that their code has avalue, so they prefer to play in interesting game "try to guess what is wrong in my smelling code"


        ICustMetadata xaContent = (ICustMetadata) this;  
        modifyAttributes(this.getSession(), xaContent);

you are already in class implementing ICustMetadata - no need to do extra castings, also you are already in IDfTypedObject - not need to pass IDfSession between methods, i.e. correct signature for modifyAttributes is:


private void modifyAttributes() throws DfException


for (int i = 0; i < metadataObj.getAttrCount(); i++){  
   int attrDataType = ((IDfType) metadataObj).getTypeAttrDataTypeAt(i); 
   String attrName = ((IDfType) metadataObj).getTypeAttrNameAt(i);

metadataObj is not a IDfType, so java.lang.ClassCastException is expected there. I think there should be something like:


for (int i = 0, n = getAttrCount(); i < n; i++) {
  IDfAttr attr = getAttr(i);
   int attrType = attr.getDataType();
  String attrName = attr.getName();
   if (attrType != IDfAttr.DM_STRING && !attrName.startsWith("xa_")) {
   continue;
  }
  toUpperCase(attrName);
}

void toUpperCase(String attrName) throws DfException {
    if (!isAttrRepeating(attrName)) {
        toUpperCase(attrName, 0);
        return;
    }
    for (int i = 0, n = getValueCount(attrName); i < n; i++) {
        toUpperCase(attrName, i);
    }
}

void toUpperCase(String attrName, int index) throws DfException {
    setRepeatingString(attrName, index, getRepeatingString(attrName, index).toUpperCase());
}


    private void setAttributeToUpper(boolean isRepeating, String attrName, IDfValue value, IDfSysObject document) throws DfException {  
          
        if (isRepeating){  
            for (int i = 0; i < document.getValueCount(attrName); i++) {  
                document.setRepeatingString(attrName, i, value.toString().toUpperCase());  
                document.save();  
            }//end for  
        }  
        else {  
            document.setRepeatingString(attrName, 0, value.toString().toUpperCase());  
            document.save();  
        }  
          
    }

Here you will get StackOverflowError because you are trying to call IDfPersistentObject.save() inside doSave() method.


    private void findUniqueAttribute(String attrName, IDfValue attrValue, IDfSysObject document) throws DfException {  
          
        String docType = document.getTypeName();  
        StringBuffer sbuf = new StringBuffer();  
        sbuf.append("select count('" + attrName + "') as cnt " +  
                "from '" + docType + "' where any '" + attrName + "' ='" + attrValue + "' " +  
                "group by '" + attrName + "' having count('" + attrName + "') > 1 " +  
                "order by '" + attrName + "' enable(row_based)");  
                                 
        IDfQuery query = new DfQuery();  
        query.setDQL(sbuf.toString());  
        IDfCollection collection = query.execute(document.getSession(), IDfQuery.EXECREAD_QUERY);  
        if (collection.next()) {  
            while (collection.next()) {  
                int result = Integer.parseInt(collection.getRepeatingString("cnt", 1)); //cnt = the count column and 1 is the index value of the result which should always be 1 (returned 1 row).  
                if (result > 1) {  
                    attrValue = null;  
                    document.save();  
                    //throw warning  
                    throw new IllegalArgumentException("The value " +attrValue+ "is not unique.");  
                }  
                document.save();  
            }  
        }  
        collection.close();  
     }

At first, here you will get collection leak because you are closing collection after throwing exception - rule of thumb is release resources in finally block (*uck yeah, it's already 2015 but EMC coders still did not mark IDfCollection and IDfSession as Closable to give a chance for IDE to perform basic code inspections and give programmers ability to use try-with-resources clause). At second, your algorithm for checking duplicates is wrong.

sbowyer6

Thanks for giving the code a look over. I guess it is an okay attempt based off some hand-me-down DFC training books and whatever else I find on Google...

What I have done so far is implemented your suggestion of the following:

for (int i = 0, n = getAttrCount(); i < n; i++) {
IDfAttr attr = getAttr(i);
int attrType = attr.getDataType();
String attrName = attr.getName();
if (attrType != IDfAttr.DM_STRING && !attrName.startsWith("xa_")) {
continue;
}
toUpperCase(attrName);
}
void toUpperCase(String attrName) throws DfException {
if (!isAttrRepeating(attrName)) {
toUpperCase(attrName, 0);
return;
}
for (int i = 0, n = getValueCount(attrName); i < n; i++) {
toUpperCase(attrName, i);
}
}
void toUpperCase(String attrName, int index) throws DfException {
setRepeatingString(attrName, index, getRepeatingString(attrName, index).toUpperCase());
}

for (int i = 0, n = getAttrCount(); i < n; i++) {
  IDfAttr attr = getAttr(i);
   int attrType = attr.getDataType();
  String attrName = attr.getName();
   if (attrType != IDfAttr.DM_STRING && !attrName.startsWith("xa_")) {
   continue;
  }
  toUpperCase(attrName);
}

void toUpperCase(String attrName) throws DfException {
    if (!isAttrRepeating(attrName)) {
        toUpperCase(attrName, 0);
        return;
    }
    for (int i = 0, n = getValueCount(attrName); i < n; i++) {
        toUpperCase(attrName, i);
    }
}

void toUpperCase(String attrName, int index) throws DfException {
    setRepeatingString(attrName, index, getRepeatingString(attrName, index).toUpperCase());
}

This got me a heck of a lot further than my last mess. So, a BIG thank you! However, now I have another issue when I click "Finish" to create my new document:

Failed to save properties
Failed to save object : [DM_SYSOBJECT_E_CANT_FIND_USER]error: "The user 'DMADMIN' specified does not exist."

This appears to me that all of the fields are getting converted to upper, specifically dmadmin. Is the user case-sensitive? There is also evidence of all the fields getting converted to uppercase in the document Name field. If I type in "test" while in the Info tab, then click "Next" the Name field will then contain "TEST". Any suggestions on where the logic in the code is going wrong here?

Speaking of suggestions, do you have any for where my algorithm is going wrong for uniqueness? It's a pretty standard database query for testing such. It works when I use it in the DQL tester in DA.

private void findUniqueAttribute(String attrName, IDfValue attrValue, IDfSysObject document) throws DfException {
String docType = document.getTypeName();
StringBuffer sbuf = new StringBuffer();
sbuf.append("select count('" + attrName + "') as cnt " +
"from '" + docType + "' where any '" + attrName + "' ='" + attrValue + "' " +
"group by '" + attrName + "' having count('" + attrName + "') > 1 " +
"order by '" + attrName + "' enable(row_based)");
IDfQuery query = new DfQuery();
query.setDQL(sbuf.toString());
IDfCollection collection = query.execute(document.getSession(), IDfQuery.EXECREAD_QUERY);
if (collection.next()) {
while (collection.next()) {
int result = Integer.parseInt(collection.getRepeatingString("cnt", 1)); //cnt = the count column and 1 is the index value of the result which should always be 1 (returned 1 row).
if (result > 1) {
attrValue = null;
document.save();
//throw warning
throw new IllegalArgumentException("The value " +attrValue+ "is not unique.");
}
document.save();
}
}
collection.close();
}

    private void findUniqueAttribute(String attrName, IDfValue attrValue, IDfSysObject document) throws DfException {  
          
        String docType = document.getTypeName();  
        StringBuffer sbuf = new StringBuffer();  
        sbuf.append("select count('" + attrName + "') as cnt " +  
                "from '" + docType + "' where any '" + attrName + "' ='" + attrValue + "' " +  
                "group by '" + attrName + "' having count('" + attrName + "') > 1 " +  
                "order by '" + attrName + "' enable(row_based)");  
                                 
        IDfQuery query = new DfQuery();  
        query.setDQL(sbuf.toString());  
        IDfCollection collection = query.execute(document.getSession(), IDfQuery.EXECREAD_QUERY);  
        if (collection.next()) {  
            while (collection.next()) {  
                int result = Integer.parseInt(collection.getRepeatingString("cnt", 1)); //cnt = the count column and 1 is the index value of the result which should always be 1 (returned 1 row).  
                if (result > 1) {  
                    attrValue = null;  
                    document.save();  
                    //throw warning  
                    throw new IllegalArgumentException("The value " +attrValue+ "is not unique.");  
                }  
                document.save();  
            }  
        }  
        collection.close();  
     }

Sorry to be "that guy" who is asking for code help, but thus far you've been very helpful. I appreciate the help.

-Sean

PanfilovAB


Failed to save properties 
Failed to save object : [DM_SYSOBJECT_E_CANT_FIND_USER]error: "The user 'DMADMIN' specified does not exist."This appears to me that all of the fields are getting converted to upper, specifically dmadmin

That's my fault. Should be:


if (attrType != IDfAttr.DM_STRING || !attrName.startsWith("xa_")) { 
  continue; 
}

instead of:


if (attrType != IDfAttr.DM_STRING && !attrName.startsWith("xa_")) { 
  continue; 
}


sbuf.append("select count('" + attrName + "') as cnt " +    
"from '" + docType + "' where any '" + attrName + "' ='" + attrValue + "' " +    
"group by '" + attrName + "' having count('" + attrName + "') > 1 " +    
"order by '" + attrName + "' enable(row_based)

at first, if you removed all redundant save calls (if don't - this check is useless because it at first saves object and then throws exception ) this check will not work for new objects because for new object object's data is not persisted in database - the correct select statement should be:


sbuf.append("select count('r_object_id') as cnt " +    
"from '" + docType + "' where any '" + attrName + "' ='" + attrValue + "' " +   
"and r_object_id <> '" + getObjectId().getId() + "'";

at second,


='" + attrValue + "' "

will fail if attrValue contains quote character - take advantage of com.documentum.fc.common.DfUtil#escapeQuotedString method.

at third, what if there are objects in repository with the same value of xa_barcode but current user is unable to query them due to lack of access permissions?

sbowyer6

Okay. This is great! Things are starting to work well, even the check unique method. There is one hang up though. It doesn't seem to be testing uniqueness past the 1st value. I have loaded a couple of test documents as follows:

Document 1:

xa_barcode = 1_test_234, xyz-567 (these get converted to upper )

Document 2:

xa_barcode = 2_test_987, 1_TEST_234 (I input this as upper, just to make sure the test works)

Document 2 gets checked in without a problem. However, if I go back and remove barcode 1 in the list (such that only the second remains), the TBO check fires correctly and gives me a warning that it's not unique.

Below is the method you've helped with before, now with the call to checkUniqueAttribute:


private void modifyAttributes() throws DfException {
        
        for (int i = 0, n = getAttrCount(); i < n; i++) {  
              IDfAttr attr = getAttr(i);  
              int attrType = attr.getDataType();  
              String attrName = attr.getName();              
              if (attrType != IDfAttr.DM_STRING || !attrName.startsWith("xa_")) {  
                  continue;  
              }
              if (attrName.equals("xa_barcode")) {
                  toUpperCase(attrName);
                  checkUniqueAttribute(attrName, this);
              }
              toUpperCase(attrName);
        }
    }

The checkUniqueAttribute method:


private void checkUniqueAttribute(String attrName, IDfSysObject document) throws DfException {

        String docType = document.getTypeName();
        IDfValue attrValue = getValue(attrName);
        StringBuffer sbuf = new StringBuffer();
        sbuf.append("select count(r_object_id) as cnt" +
                " from " + docType + 
                " where any " + attrName + " = '" + attrValue.asString() + "'" +
                " and r_object_id <> '" + getObjectId().getId() + "'");
                //deal with input that has quotes: DfUtil.escapeQuotedString(attrValue.asString()) 
        
        IDfCollection collection = null;   
        try {
            IDfQuery query = new DfQuery();
            query.setDQL(sbuf.toString());
            collection = query.execute(document.getSession(),IDfQuery.EXECREAD_QUERY);
            while (collection.next()) {
                int result = collection.getInt("cnt");
                if (result != 0) {
                    throw new IllegalArgumentException("The value "+ attrValue + " was not unique.");
                }
            }
        } finally {
            // ALWAYS cleanup your collections!
            if (collection != null) {
                collection.close();
            }
        }    
    }

I was thinking that the "ANY" DQL keyword would be checking all the repeating values. What do you think?

Thank you as always,

-Sean

PanfilovAB

You are checking uniqueness against first value only - getValue(attrName) returns first repeating value. You need either submit multiple queries for each repeating value or build more complex query