how to perform a search and limit the number of results returned : Search « JNDI LDAP « Java

1. Java
2. JNDI LDAP
3. Search

how to perform a search and limit the number of results returned

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import java.util.Hashtable;

import javax.naming.Context;
import javax.naming.NamingEnumeration;
import javax.naming.NamingException;
import javax.naming.SizeLimitExceededException;
import javax.naming.directory.DirContext;
import javax.naming.directory.InitialDirContext;
import javax.naming.directory.SearchControls;
import javax.naming.directory.SearchResult;

/**
 * Demonstrates how to perform a search and limit the number of results
 * returned.
 * 
 * usage: java SearchCountLimit
 */
class SearchCountLimit {
  static int expected = 1;

  public static void printSearchEnumeration(NamingEnumeration srhEnum) {
    int count = 0;
    try {
      while (srhEnum.hasMore()) {
        SearchResult sr = (SearchResult) srhEnum.next();
        System.out.println(">>>" + sr.getName());
        ++count;
      }
      System.out.println("number of answers: " + count);
    } catch (SizeLimitExceededException e) {
      if (count == expected)
        System.out.println("number of answers: " + count);
      else
        e.printStackTrace();
    } catch (NamingException e) {
      e.printStackTrace();
    }
  }

  public static void main(String[] args) {

    // Set up the environment for creating the initial context
    Hashtable<String, Object> env = new Hashtable<String, Object>(11);
    env
        .put(Context.INITIAL_CONTEXT_FACTORY,
            "com.sun.jndi.ldap.LdapCtxFactory");
    env.put(Context.PROVIDER_URL, "ldap://localhost:389/o=JNDITutorial");

    try {
      // Create initial context
      DirContext ctx = new InitialDirContext(env);

      // Set search controls to limit count to 'expected'
      SearchControls ctls = new SearchControls();
      ctls.setCountLimit(expected);

      // Search for objects with those matching attributes
      NamingEnumeration answer = ctx.search("ou=People", "(sn=M*)", ctls);

      // Print the answer
      printSearchEnumeration(answer);

      // Close the context when we're done
      ctx.close();
    } catch (Exception e) {
      System.err.println(e);
    }
  }
}

 

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