Implementing Other Custom Context Methods

Implementing Other Custom Context Methods
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In the same manner as for custom search methods, you can actually execute any method in DirContext by using a ContextExecutor.

public interface ContextExecutor {
   public Object executeWithContext(DirContext ctx) throws NamingException;
}

When implementing a custom ContextExecutor, you can choose between using the executeReadOnly() or the executeReadWrite() method. Let's say that we want to call this method:

Object lookupLink(Name name)

It's available in DirContext, but there is no matching method in LdapTemplate. It's a lookup method, so it should be read-only. We can implement it like this:

Example 4.3. A custom DirContext method using ContextExecutor

package com.example.dao;

public class PersonDaoImpl implements PersonDao {
   ...
   public Object lookupLink(final Name name) {
      ContextExecutor executor = new ContextExecutor() {
         public Object executeWithContext(DirContext ctx) {
            return ctx.lookupLink(name);
         }
      };

      return ldapTemplate.executeReadOnly(executor);
   }
}

In the same manner you can execute a read-write operation using the executeReadWrite() method.