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    • com.unboundid.ldap.sdk.migrate.ldapjdk.LDAPSearchResults Maven / Gradle / Ivy

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    The UnboundID LDAP SDK for Java is a fast, comprehensive, and easy-to-use Java API for communicating with LDAP directory servers and performing related tasks like reading and writing LDIF, encoding and decoding data using base64 and ASN.1 BER, and performing secure communication. This package contains the Commercial Edition of the LDAP SDK, which includes all of the general-purpose functionality contained in the Standard Edition, plus additional functionality specific to UnboundID server products.

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    /*
 * Copyright 2009-2016 UnboundID Corp.
 * All Rights Reserved.
 */
/*
 * Copyright (C) 2009-2016 UnboundID Corp.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License (GPLv2 only)
 * or the terms of the GNU Lesser General Public License (LGPLv2.1 only)
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see .
 */
package com.unboundid.ldap.sdk.migrate.ldapjdk;



import java.util.Enumeration;
import java.util.NoSuchElementException;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.atomic.AtomicReference;

import com.unboundid.ldap.sdk.AsyncRequestID;
import com.unboundid.ldap.sdk.AsyncSearchResultListener;
import com.unboundid.ldap.sdk.Control;
import com.unboundid.ldap.sdk.ResultCode;
import com.unboundid.ldap.sdk.SearchResult;
import com.unboundid.ldap.sdk.SearchResultEntry;
import com.unboundid.ldap.sdk.SearchResultReference;
import com.unboundid.util.InternalUseOnly;
import com.unboundid.util.Mutable;
import com.unboundid.util.NotExtensible;
import com.unboundid.util.ThreadSafety;
import com.unboundid.util.ThreadSafetyLevel;

import static com.unboundid.util.Debug.*;



/**
 * This class provides a data structure that provides access to data returned
 * in response to a search operation.
 * 

    
 * This class is primarily intended to be used in the process of updating
 * applications which use the Netscape Directory SDK for Java to switch to or
 * coexist with the UnboundID LDAP SDK for Java.  For applications not written
 * using the Netscape Directory SDK for Java, the {@link SearchResult} class
 * should be used instead.
 */
@Mutable()
@NotExtensible()
@ThreadSafety(level=ThreadSafetyLevel.NOT_THREADSAFE)
public class LDAPSearchResults
       implements Enumeration, AsyncSearchResultListener
{
  /**
   * The serial version UID for this serializable class.
   */
  private static final long serialVersionUID = 7884355145560496230L;



  // Indicates whether the end of the result set has been reached.
  private final AtomicBoolean searchDone;

  // The number of items that can be read immediately without blocking.
  private final AtomicInteger count;

  // The set of controls for the last result element returned.
  private final AtomicReference lastControls;

  // The next object to be returned.
  private final AtomicReference nextResult;

  // The search result done message for the search.
  private final AtomicReference searchResult;

  // The maximum length of time in milliseconds to wait for a response.
  private final long maxWaitTime;

  // The queue used to hold results.
  private final LinkedBlockingQueue resultQueue;



  /**
   * Creates a new LDAP search results object.
   */
  public LDAPSearchResults()
  {
    this(0L);
  }



  /**
   * Creates a new LDAP search results object with the specified maximum wait
   * time.
   *
   * @param  maxWaitTime  The maximum wait time in milliseconds.
   */
  public LDAPSearchResults(final long maxWaitTime)
  {
    this.maxWaitTime = maxWaitTime;

    searchDone   = new AtomicBoolean(false);
    count        = new AtomicInteger(0);
    lastControls = new AtomicReference();
    nextResult   = new AtomicReference();
    searchResult = new AtomicReference();
    resultQueue  = new LinkedBlockingQueue(50);
  }



  /**
   * Retrieves the next object returned from the server, if possible.  When this
   * method returns, then the {@code nextResult} reference will also contain the
   * object that was returned.
   *
   * @return  The next object returned from the server, or {@code null} if there
   *          are no more objects to return.
   */
  private Object nextObject()
  {
    Object o = nextResult.get();
    if (o != null)
    {
      return o;
    }

    o = resultQueue.poll();
    if (o != null)
    {
      nextResult.set(o);
      return o;
    }

    if (searchDone.get())
    {
      return null;
    }

    try
    {
      if (maxWaitTime > 0)
      {
        o = resultQueue.poll(maxWaitTime, TimeUnit.MILLISECONDS);
        if (o == null)
        {
          o = new SearchResult(-1, ResultCode.TIMEOUT, null, null, null, 0, 0,
               null);
          count.incrementAndGet();
        }
      }
      else
      {
        o = resultQueue.take();
      }
    }
    catch (Exception e)
    {
      debugException(e);

      o = new SearchResult(-1, ResultCode.USER_CANCELED, null, null, null, 0, 0,
           null);
      count.incrementAndGet();
    }

    nextResult.set(o);
    return o;
  }



  /**
   * Indicates whether there are any more search results to return.
   *
   * @return  {@code true} if there are more search results to return, or
   *          {@code false} if not.
   */
  public boolean hasMoreElements()
  {
    final Object o = nextObject();
    if (o == null)
    {
      return false;
    }

    if (o instanceof SearchResult)
    {
      final SearchResult r = (SearchResult) o;
      if (r.getResultCode().equals(ResultCode.SUCCESS))
      {
        lastControls.set(r.getResponseControls());
        searchDone.set(true);
        nextResult.set(null);
        return false;
      }
    }

    return true;
  }



  /**
   * Retrieves the next element in the set of search results.
   *
   * @return  The next element in the set of search results.
   *
   * @throws  NoSuchElementException  If there are no more results.
   */
  public Object nextElement()
         throws NoSuchElementException
  {
    final Object o = nextObject();
    if (o == null)
    {
      throw new NoSuchElementException();
    }

    nextResult.set(null);
    count.decrementAndGet();

    if (o instanceof SearchResultEntry)
    {
      final SearchResultEntry e = (SearchResultEntry) o;
      lastControls.set(e.getControls());
      return new LDAPEntry(e);
    }
    else if (o instanceof SearchResultReference)
    {
      final SearchResultReference r = (SearchResultReference) o;
      lastControls.set(r.getControls());
      return new LDAPReferralException(r);
    }
    else
    {
      final SearchResult r = (SearchResult) o;
      searchDone.set(true);
      nextResult.set(null);
      lastControls.set(r.getResponseControls());
      return new LDAPException(r.getDiagnosticMessage(),
           r.getResultCode().intValue(), r.getDiagnosticMessage(),
           r.getMatchedDN());
    }
  }



  /**
   * Retrieves the next entry from the set of search results.
   *
   * @return  The next entry from the set of search results.
   *
   * @throws  LDAPException  If there are no more elements to return, or if
   *                         the next element in the set of results is not an
   *                         entry.
   */
  public LDAPEntry next()
         throws LDAPException
  {
    if (! hasMoreElements())
    {
      throw new LDAPException(null, ResultCode.NO_RESULTS_RETURNED_INT_VALUE);
    }

    final Object o = nextElement();
    if (o instanceof LDAPEntry)
    {
      return (LDAPEntry) o;
    }

    throw (LDAPException) o;
  }



  /**
   * Retrieves the number of results that are available for immediate
   * processing.
   *
   * @return  The number of results that are available for immediate processing.
   */
  public int getCount()
  {
    return count.get();
  }



  /**
   * Retrieves the response controls for the last result element returned, or
   * for the search itself if the search has completed.
   *
   * @return  The response controls for the last result element returned, or
   *          {@code null} if no elements have yet been returned or if the last
   *          element did not include any controls.
   */
  public LDAPControl[] getResponseControls()
  {
    final Control[] controls = lastControls.get();
    if ((controls == null) || (controls.length == 0))
    {
      return null;
    }

    return LDAPControl.toLDAPControls(controls);
  }



  /**
   * {@inheritDoc}
   */
  @InternalUseOnly()
  public void searchEntryReturned(final SearchResultEntry searchEntry)
  {
    if (searchDone.get())
    {
      return;
    }

    try
    {
      resultQueue.put(searchEntry);
      count.incrementAndGet();
    }
    catch (Exception e)
    {
      // This should never happen.
      debugException(e);
      searchDone.set(true);
    }
  }



  /**
   * {@inheritDoc}
   */
  @InternalUseOnly()
  public void searchReferenceReturned(
                   final SearchResultReference searchReference)
  {
    if (searchDone.get())
    {
      return;
    }

    try
    {
      resultQueue.put(searchReference);
      count.incrementAndGet();
    }
    catch (Exception e)
    {
      // This should never happen.
      debugException(e);
      searchDone.set(true);
    }
  }



  /**
   * Indicates that the provided search result has been received in response to
   * an asynchronous search operation.  Note that automatic referral following
   * is not supported for asynchronous operations, so it is possible that this
   * result could include a referral.
   *
   * @param  requestID     The async request ID of the request for which the
   *                       response was received.
   * @param  searchResult  The search result that has been received.
   */
  @InternalUseOnly()
  public void searchResultReceived(final AsyncRequestID requestID,
                                   final SearchResult searchResult)
  {
    if (searchDone.get())
    {
      return;
    }

    try
    {
      resultQueue.put(searchResult);
      if (! searchResult.getResultCode().equals(ResultCode.SUCCESS))
      {
        count.incrementAndGet();
      }
    }
    catch (Exception e)
    {
      // This should never happen.
      debugException(e);
      searchDone.set(true);
    }
  }
}
    
    
    
    

    




    
    
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