/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* You can obtain a copy of the license at
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE
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* or https://OpenDS.dev.java.net/OpenDS.LICENSE.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE. If applicable,
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* add the following below this CDDL HEADER, with the fields enclosed
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* by brackets "[]" replaced with your own identifying information:
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* Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*
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*
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* Copyright 2008-2010 Sun Microsystems, Inc.
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* Portions Copyright 2011-2013 ForgeRock AS
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*/
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package org.opends.server.replication.plugin;
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import java.util.Collections;
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import java.util.Iterator;
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import java.util.Map;
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import org.opends.server.replication.common.CSN;
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import org.opends.server.types.*;
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/**
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* This class is used to store historical information for single valued
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* attributes.
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* One object of this type is created for each attribute that was changed in
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* the entry.
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* It allows to record the last time a given value was added,
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* and the last time the whole attribute was deleted.
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*/
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public class AttrHistoricalSingle extends AttrHistorical
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{
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/** Last time when the attribute was deleted. */
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private CSN deleteTime = null;
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/** Last time when a value was added. */
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private CSN addTime = null;
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/** Last added value. */
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private AttributeValue value = null;
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/**
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* last operation applied. This is only used for multiple mods on the same
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* single valued attribute in the same modification.
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*/
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private HistAttrModificationKey lastMod = null;
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/**
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* {@inheritDoc}
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*/
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@Override
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public CSN getDeleteTime()
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{
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return this.deleteTime;
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public Map<AttrValueHistorical,AttrValueHistorical> getValuesHistorical()
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{
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if (addTime == null)
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{
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return Collections.emptyMap();
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}
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else
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{
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AttrValueHistorical val = new AttrValueHistorical(value, addTime, null);
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return Collections.singletonMap(val, val);
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}
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public void processLocalOrNonConflictModification(CSN csn, Modification mod)
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{
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AttributeValue newValue = null;
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Attribute modAttr = mod.getAttribute();
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if (modAttr != null && !modAttr.isEmpty())
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{
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newValue = modAttr.iterator().next();
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}
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switch (mod.getModificationType())
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{
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case DELETE:
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this.addTime = null;
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this.deleteTime = csn;
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this.value = newValue;
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lastMod = HistAttrModificationKey.DEL;
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break;
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case ADD:
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this.addTime = csn;
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this.value = newValue;
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lastMod = HistAttrModificationKey.ADD;
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break;
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case REPLACE:
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if (newValue == null)
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{
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// REPLACE with null value is actually a DELETE
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this.addTime = null;
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this.deleteTime = csn;
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this.value = null;
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lastMod = HistAttrModificationKey.DEL;
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}
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else
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{
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this.deleteTime = addTime = csn;
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lastMod = HistAttrModificationKey.REPL;
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}
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this.value = newValue;
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break;
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case INCREMENT:
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/* FIXME : we should update CSN */
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break;
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}
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public boolean replayOperation(Iterator<Modification> modsIterator, CSN csn,
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Entry modifiedEntry, Modification mod)
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{
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boolean conflict = false;
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AttributeValue newValue = null;
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Attribute modAttr = mod.getAttribute();
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if (modAttr != null && !modAttr.isEmpty())
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{
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newValue = modAttr.iterator().next();
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}
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switch (mod.getModificationType())
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{
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case DELETE:
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if (csn.newer(addTime))
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{
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if (newValue == null || newValue.equals(value) || value == null)
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{
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if (csn.newer(deleteTime))
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{
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deleteTime = csn;
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}
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AttributeType type = modAttr.getAttributeType();
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if (!modifiedEntry.hasAttribute(type))
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{
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conflict = true;
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modsIterator.remove();
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}
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else if ((newValue != null) &&
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(!modifiedEntry.hasValue(type, modAttr.getOptions(), newValue)))
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{
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conflict = true;
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modsIterator.remove();
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}
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else
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{
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addTime = null;
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lastMod = HistAttrModificationKey.DEL;
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value = null;
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}
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}
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else
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{
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conflict = true;
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modsIterator.remove();
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}
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}
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else if (csn.equals(addTime))
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{
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if ((lastMod == HistAttrModificationKey.ADD)
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|| (lastMod == HistAttrModificationKey.REPL))
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{
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if (csn.newer(deleteTime))
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{
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deleteTime = csn;
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}
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addTime = null;
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lastMod = HistAttrModificationKey.DEL;
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value = null;
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}
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else
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{
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conflict = true;
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modsIterator.remove();
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}
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}
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else
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{
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conflict = true;
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modsIterator.remove();
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}
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break;
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case ADD:
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if (csn.newerOrEquals(deleteTime) && csn.older(addTime))
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{
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conflict = true;
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mod.setModificationType(ModificationType.REPLACE);
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addTime = csn;
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value = newValue;
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lastMod = HistAttrModificationKey.REPL;
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}
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else
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{
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if (csn.newerOrEquals(deleteTime)
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&& ((addTime == null ) || addTime.older(deleteTime)))
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{
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// no conflict : don't do anything beside setting the addTime
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addTime = csn;
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value = newValue;
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lastMod = HistAttrModificationKey.ADD;
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}
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else
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{
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// Case where CSN = addTime = deleteTime
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if (csn.equals(deleteTime) && csn.equals(addTime)
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&& (lastMod == HistAttrModificationKey.DEL))
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{
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// No conflict, record the new value.
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value = newValue;
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lastMod = HistAttrModificationKey.ADD;
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}
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else
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{
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conflict = true;
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modsIterator.remove();
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}
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}
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}
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break;
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case REPLACE:
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if (csn.older(deleteTime))
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{
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conflict = true;
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modsIterator.remove();
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}
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else
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{
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if (newValue == null)
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{
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addTime = null;
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value = newValue;
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deleteTime = csn;
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lastMod = HistAttrModificationKey.DEL;
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}
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else
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{
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addTime = csn;
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value = newValue;
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deleteTime = csn;
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lastMod = HistAttrModificationKey.REPL;
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}
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}
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break;
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case INCREMENT:
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/* FIXME : we should update CSN */
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break;
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}
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return conflict;
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}
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/**
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* {@inheritDoc}
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*/
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@Override
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public void assign(HistAttrModificationKey histKey,
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AttributeValue value, CSN csn)
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{
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switch (histKey)
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{
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case ADD:
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this.addTime = csn;
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this.value = value;
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break;
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case DEL:
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this.deleteTime = csn;
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if (value != null)
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this.value = value;
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break;
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case REPL:
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this.addTime = this.deleteTime = csn;
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if (value != null)
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this.value = value;
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break;
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case DELATTR:
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this.deleteTime = csn;
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break;
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}
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}
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}
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