Using my own class from templates

himawan · **Joined:** Sat Aug 19, 2006 6:31 pm **Posts:** 139

Hi,

I'm trying to customize my equals() and hasCode() methods so that it is based on the columns that have a unique constraint. So I was able to actually get part of it to work.

I defined the following in my ant target, within the hbm2java task.

Code:

<property key="hibernatetool.myequals.toolclass"
         value="org.hibernate.tool.hbm2x.pojo.MyPojoClass"/>

Here's my PojoEqualsHashcode.ftl
------------------------------------------------------------
<#if myequals.isUniqueConstraintExist(pojo) && !clazz.superclass?exists>
public boolean equals(Object other) {
if ( (this == other ) ) return true;
if ( (other == null ) ) return false;
if ( !(other instanceof ${pojo.getDeclarationName()}) ) return false;
${pojo.getDeclarationName()} castOther = (
${pojo.getDeclarationName()} ) other;

return ${myequals.generateEquals(pojo, "this", "castOther", jdk5)};
}

public int hashCode() {
int result = 17;

<#foreach property in pojo.getAllPropertiesIterator()>
${pojo.generateHashCode(property, "result", "this", jdk5)}
</#foreach> return result;
}
</#if>
----------------------------------------------------------------

If I don't use myequals in the <#if ...> statement this whole thing works. But if I used it like shown above, I get the following error.

Code:

ERROR -
[hibernatetool] Expression myequals.isUniqueConstraintExist is undefined on
line 1, column 6 in pojo/PojoEqualsHashcode.ftl.
[hibernatetool] The problematic instruction:
[hibernatetool] ----------
[hibernatetool] ==> if myequals.isUniqueConstraintExist(pojo) && !clazz.superclass?exists [on line 1, column 1 in pojo/PojoEqualsHashcode.ftl]
[hibernatetool] in include "PojoEqualsHashcode.ftl" [on line 16, column 1 in
pojo/Pojo.ftl]
[hibernatetool] ----------

Thanks in advance.
Budyanto

himawan · **Joined:** Sat Aug 19, 2006 6:31 pm **Posts:** 139

Sorry. just one clarification point. The error says that the expression is undefined. I verified that it actually does exist.

Am I using it with the wrong syntax?

Budyanto

max · **Posted:** Sat Feb 17, 2007 1:19 pm

show the code of your MyPojoClass....

himawan · **Joined:** Sat Aug 19, 2006 6:31 pm **Posts:** 139

Hi Max,

Here it is.

I'm sure there are better ways of doing the same thing. I would be open to suggestions as well.

So the generateEquals() method works. The isUniqueConstraintExist is the one giving me problems.

Code:

package org.hibernate.tool.hbm2x.pojo;

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

import org.apache.log4j.Logger;
import org.hibernate.mapping.Column;
import org.hibernate.mapping.Property;

public class MyPojoClass {
   private static final Logger logger = Logger.getLogger(MyPojoClass.class);
   
   // This class is instantiated once during reverse engineering
   public MyPojoClass () {
      logger.info("MyPojoClass constructed.");
   }
   
   public String generateEquals(BasicPOJOClass pojo, 
         String thisName, String otherName, boolean useGenerics) {
      logger.info("Calling my generateEquals, pojo: " +
pojo.getClass().getName());
      
      List uniqueProps = getUniqueKeys(pojo);
      
      return pojo.generateEquals(thisName, otherName,
uniqueProps.iterator(), useGenerics);
      
   }
   
   public List getUniqueKeys(BasicPOJOClass pojo) {
      List uniqueProps = new ArrayList();
      Iterator i = pojo.getAllPropertiesIterator();
      while (i.hasNext()) {
         Property p = (Property)i.next();
         //logger.info("Iterating through props: " + p.getName());
         Iterator colIter = p.getColumnIterator();
         while (colIter.hasNext()) {
            Column c = (Column)colIter.next();
            //logger.info("Column iter: " + c.getName());
            
            if (c.isUnique() && !c.getName().equals("id")) {
               logger.info("UNIQUE: " + p.getName());
               uniqueProps.add(p);
            }
         }
      }
      
      return uniqueProps;
   }
   
   boolean isUniqueConstraintExist(BasicPOJOClass pojo) {
      List uniqueProps = getUniqueKeys(pojo);
      
      if (uniqueProps.size() > 0) {
         return true;
      }
      
      return false;
   }

}

Thanks
Budyanto

max · **Posted:** Mon Feb 19, 2007 2:13 am

hmmm....could you try and rename the method to something without *is* in it ? just to check that it's not freemarker messing up the names...

himawan · **Joined:** Sat Aug 19, 2006 6:31 pm **Posts:** 139

Ok this was a stupid mistake. I didn't have a "public" keyword for the method in question.

I was trying to use the same method someplace else and it gave me the same error. So It forced me to look athe the signature closer.

Budyanto

max · **Posted:** Mon Feb 19, 2007 4:56 am

ah of course...sorry for not spotting that one ;)