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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 Standard Edition of the LDAP SDK, which is a complete, general-purpose library for communicating with LDAPv3 directory servers.

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/*
 * Copyright 2009-2022 Ping Identity Corporation
 * All Rights Reserved.
 */
/*
 * Copyright 2009-2022 Ping Identity Corporation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/*
 * Copyright (C) 2009-2022 Ping Identity Corporation
 *
 * 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.Debug;
import com.unboundid.util.InternalUseOnly;
import com.unboundid.util.Mutable;
import com.unboundid.util.NotExtensible;
import com.unboundid.util.NotNull;
import com.unboundid.util.Nullable;
import com.unboundid.util.ThreadSafety;
import com.unboundid.util.ThreadSafetyLevel;



/**
 * 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;



  // The asynchronous request ID for these search results.
  @Nullable private volatile AsyncRequestID asyncRequestID;

  // Indicates whether the search has been abandoned.
  @NotNull private final AtomicBoolean searchAbandoned;

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

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

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

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

  // The search result done message for the search.
  @NotNull 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.
  @NotNull 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;

    asyncRequestID = null;
    searchAbandoned = new AtomicBoolean(false);
    searchDone      = new AtomicBoolean(false);
    count           = new AtomicInteger(0);
    lastControls    = new AtomicReference<>();
    nextResult      = new AtomicReference<>();
    searchResult    = new AtomicReference<>();
    resultQueue     = new LinkedBlockingQueue<>(50);
  }



  /**
   * Indicates that this search request has been abandoned.
   */
  void setAbandoned()
  {
    searchAbandoned.set(true);
  }



  /**
   * Retrieves the asynchronous request ID for the associates search operation.
   *
   * @return  The asynchronous request ID for the associates search operation.
   */
  @Nullable()
  AsyncRequestID getAsyncRequestID()
  {
    return asyncRequestID;
  }



  /**
   * Sets the asynchronous request ID for the associated search operation.
   *
   * @param  asyncRequestID  The asynchronous request ID for the associated
   *                         search operation.
   */
  void setAsyncRequestID(@Nullable final AsyncRequestID asyncRequestID)
  {
    this.asyncRequestID = asyncRequestID;
  }



  /**
   * 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.
   */
  @Nullable()
  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() || searchAbandoned.get())
    {
      return null;
    }

    try
    {
      final long stopWaitTime;
      if (maxWaitTime > 0L)
      {
        stopWaitTime = System.currentTimeMillis() + maxWaitTime;
      }
      else
      {
        stopWaitTime = Long.MAX_VALUE;
      }

      while ((! searchAbandoned.get()) &&
             (System.currentTimeMillis() < stopWaitTime))
      {
        o = resultQueue.poll(100L, TimeUnit.MILLISECONDS);
        if (o != null)
        {
          break;
        }
      }

      if (o == null)
      {
        if (searchAbandoned.get())
        {
          o = new SearchResult(-1, ResultCode.USER_CANCELED, null, null, null,
               0, 0, null);
          count.incrementAndGet();
        }
        else
        {
          o = new SearchResult(-1, ResultCode.TIMEOUT, null, null, null, 0, 0,
               null);
          count.incrementAndGet();
        }
      }
    }
    catch (final Exception e)
    {
      Debug.debugException(e);

      if (e instanceof InterruptedException)
      {
        Thread.currentThread().interrupt();
      }

      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.
   */
  @Override()
  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.
   */
  @Override()
  @NotNull()
  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.
   */
  @NotNull()
  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.
   */
  @Nullable()
  public LDAPControl[] getResponseControls()
  {
    final Control[] controls = lastControls.get();
    if ((controls == null) || (controls.length == 0))
    {
      return null;
    }

    return LDAPControl.toLDAPControls(controls);
  }



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

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

      if (e instanceof InterruptedException)
      {
        Thread.currentThread().interrupt();
      }

      searchDone.set(true);
    }
  }



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

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

      if (e instanceof InterruptedException)
      {
        Thread.currentThread().interrupt();
      }

      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()
  @Override()
  public void searchResultReceived(@NotNull final AsyncRequestID requestID,
                                   @NotNull final SearchResult searchResult)
  {
    if (searchDone.get())
    {
      return;
    }

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

      if (e instanceof InterruptedException)
      {
        Thread.currentThread().interrupt();
      }

      searchDone.set(true);
    }
  }
}
    

    

    

            

    

            



    
    






    
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