001/*
002 * Copyright 2016-2017 UnboundID Corp.
003 * All Rights Reserved.
004 */
005/*
006 * Copyright (C) 2016-2017 UnboundID Corp.
007 *
008 * This program is free software; you can redistribute it and/or modify
009 * it under the terms of the GNU General Public License (GPLv2 only)
010 * or the terms of the GNU Lesser General Public License (LGPLv2.1 only)
011 * as published by the Free Software Foundation.
012 *
013 * This program is distributed in the hope that it will be useful,
014 * but WITHOUT ANY WARRANTY; without even the implied warranty of
015 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
016 * GNU General Public License for more details.
017 *
018 * You should have received a copy of the GNU General Public License
019 * along with this program; if not, see <http://www.gnu.org/licenses>.
020 */
021package com.unboundid.ldap.sdk.transformations;
022
023
024
025import java.util.ArrayList;
026import java.util.Collection;
027import java.util.Collections;
028import java.util.HashSet;
029import java.util.Set;
030import java.util.concurrent.atomic.AtomicLong;
031
032import com.unboundid.ldap.sdk.Attribute;
033import com.unboundid.ldap.sdk.DN;
034import com.unboundid.ldap.sdk.Entry;
035import com.unboundid.ldap.sdk.RDN;
036import com.unboundid.ldap.sdk.schema.AttributeTypeDefinition;
037import com.unboundid.ldap.sdk.schema.Schema;
038import com.unboundid.util.Debug;
039import com.unboundid.util.StaticUtils;
040import com.unboundid.util.ThreadSafety;
041import com.unboundid.util.ThreadSafetyLevel;
042
043
044
045/**
046 * This class provides an implementation of an entry transformation that will
047 * replace the existing set of values for a given attribute with a value that
048 * contains a numeric counter (optionally along with additional static text)
049 * that increments for each entry that contains the target attribute.  The
050 * resulting attribute will only have a single value, even if it originally had
051 * multiple values.
052 */
053@ThreadSafety(level=ThreadSafetyLevel.COMPLETELY_THREADSAFE)
054public final class ReplaceWithCounterTransformation
055       implements EntryTransformation
056{
057  // The counter to use to obtain the values.
058  private final AtomicLong counter;
059
060  // Indicates whether to update the DN of the target entry if its RDN includes
061  // the target attribute.
062  private final boolean replaceInRDN;
063
064  // The amount by which to increment the counter for each entry.
065  private final long incrementAmount;
066
067  // The schema to use when processing.
068  private final Schema schema;
069
070  // The names that may be used to reference the attribute to replace.
071  private final Set<String> names;
072
073  // The static text that will appear after the number in generated values.
074  private final String afterText;
075
076  // The static text that will appear before the number in generated values.
077  private final String beforeText;
078
079
080
081  /**
082   * Creates a new replace with counter transformation using the provided
083   * information.
084   *
085   * @param  schema           The schema to use to identify alternate names for
086   *                          the target attribute.  This may be {@code null} if
087   *                          a default standard schema should be used.
088   * @param  attributeName    The name of the attribute that should be replaced
089   *                          with the generated value.
090   * @param  initialValue     The initial value to use for the counter.
091   * @param  incrementAmount  The amount by which the counter should be
092   *                          incremented for each entry containing the target
093   *                          attribute.
094   * @param  beforeText       An optional string that should appear before the
095   *                          counter in generated values.  It may be
096   *                          {@code null} if no before text should be used.
097   * @param  afterText        An optional string that should appear after the
098   *                          counter in generated values.  It may be
099   *                          {@code null} if no after text should be used.
100   * @param  replaceInRDN     Indicates whether to update the DN of the target
101   *                          entry if its RDN includes the target attribute.
102   */
103  public ReplaceWithCounterTransformation(final Schema schema,
104                                          final String attributeName,
105                                          final long initialValue,
106                                          final long incrementAmount,
107                                          final String beforeText,
108                                          final String afterText,
109                                          final boolean replaceInRDN)
110  {
111    this.incrementAmount = incrementAmount;
112    this.replaceInRDN = replaceInRDN;
113
114    counter = new AtomicLong(initialValue);
115
116    if (beforeText == null)
117    {
118      this.beforeText = "";
119    }
120    else
121    {
122      this.beforeText = beforeText;
123    }
124
125    if (afterText == null)
126    {
127      this.afterText = "";
128    }
129    else
130    {
131      this.afterText = afterText;
132    }
133
134
135    // If a schema was provided, then use it.  Otherwise, use the default
136    // standard schema.
137    Schema s = schema;
138    if (s == null)
139    {
140      try
141      {
142        s = Schema.getDefaultStandardSchema();
143      }
144      catch (final Exception e)
145      {
146        // This should never happen.
147        Debug.debugException(e);
148      }
149    }
150    this.schema = s;
151
152
153    // Get all names that can be used to reference the target attribute.
154    final HashSet<String> nameSet = new HashSet<String>(5);
155    final String baseName =
156         StaticUtils.toLowerCase(Attribute.getBaseName(attributeName));
157    nameSet.add(baseName);
158    if (s != null)
159    {
160      final AttributeTypeDefinition at = s.getAttributeType(baseName);
161      if (at != null)
162      {
163        nameSet.add(StaticUtils.toLowerCase(at.getOID()));
164        for (final String name : at.getNames())
165        {
166          nameSet.add(StaticUtils.toLowerCase(name));
167        }
168      }
169    }
170    names = Collections.unmodifiableSet(nameSet);
171  }
172
173
174
175  /**
176   * {@inheritDoc}
177   */
178  public Entry transformEntry(final Entry e)
179  {
180    if (e == null)
181    {
182      return null;
183    }
184
185
186    // See if the DN contains the target attribute in the RDN.  If so, then
187    // replace its value.
188    String dn = e.getDN();
189    String newValue = null;
190    if (replaceInRDN)
191    {
192      try
193      {
194        final DN parsedDN = new DN(dn);
195        final RDN rdn = parsedDN.getRDN();
196        for (final String name : names)
197        {
198          if (rdn.hasAttribute(name))
199          {
200            newValue =
201                 beforeText + counter.getAndAdd(incrementAmount) + afterText;
202            break;
203          }
204        }
205
206        if (newValue != null)
207        {
208          if (rdn.isMultiValued())
209          {
210            final String[] attrNames = rdn.getAttributeNames();
211            final byte[][] originalValues = rdn.getByteArrayAttributeValues();
212            final byte[][] newValues = new byte[originalValues.length][];
213            for (int i=0; i < attrNames.length; i++)
214            {
215              if (names.contains(StaticUtils.toLowerCase(attrNames[i])))
216              {
217                newValues[i] = StaticUtils.getBytes(newValue);
218              }
219              else
220              {
221                newValues[i] = originalValues[i];
222              }
223            }
224            dn = new DN(new RDN(attrNames, newValues, schema),
225                 parsedDN.getParent()).toString();
226          }
227          else
228          {
229            dn = new DN(new RDN(rdn.getAttributeNames()[0], newValue, schema),
230                 parsedDN.getParent()).toString();
231          }
232        }
233      }
234      catch (final Exception ex)
235      {
236        Debug.debugException(ex);
237      }
238    }
239
240
241    // If the RDN doesn't contain the target attribute, then see if the entry
242    // contains the target attribute.  If not, then just return the provided
243    // entry.
244    if (newValue == null)
245    {
246      boolean hasAttribute = false;
247      for (final String name : names)
248      {
249        if (e.hasAttribute(name))
250        {
251          hasAttribute = true;
252          break;
253        }
254      }
255
256      if (! hasAttribute)
257      {
258        return e;
259      }
260    }
261
262
263    // If we haven't computed the new value for this entry, then do so now.
264    if (newValue == null)
265    {
266      newValue = beforeText + counter.getAndAdd(incrementAmount) + afterText;
267    }
268
269
270    // Iterate through the attributes in the entry and make the appropriate
271    // updates.
272    final Collection<Attribute> originalAttributes = e.getAttributes();
273    final ArrayList<Attribute> updatedAttributes =
274         new ArrayList<Attribute>(originalAttributes.size());
275    for (final Attribute a : originalAttributes)
276    {
277      if (names.contains(StaticUtils.toLowerCase(a.getBaseName())))
278      {
279        updatedAttributes.add(new Attribute(a.getName(), schema, newValue));
280      }
281      else
282      {
283        updatedAttributes.add(a);
284      }
285    }
286
287
288    // Return the updated entry.
289    return new Entry(dn, schema, updatedAttributes);
290  }
291
292
293
294  /**
295   * {@inheritDoc}
296   */
297  public Entry translate(final Entry original, final long firstLineNumber)
298  {
299    return transformEntry(original);
300  }
301
302
303
304  /**
305   * {@inheritDoc}
306   */
307  public Entry translateEntryToWrite(final Entry original)
308  {
309    return transformEntry(original);
310  }
311}