/*
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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 legal-notices/CDDLv1_0.txt
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* or http://forgerock.org/license/CDDLv1.0.html.
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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 legal-notices/CDDLv1_0.txt.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* 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 2011-2015 ForgeRock AS
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*/
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package org.opends.server.replication.plugin;
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import static org.opends.server.replication.plugin.HistAttrModificationKey.*;
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import java.util.Collections;
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import java.util.Iterator;
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import java.util.Set;
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import org.forgerock.opendj.ldap.ByteString;
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import org.forgerock.opendj.ldap.ModificationType;
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import org.opends.server.replication.common.CSN;
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import org.opends.server.types.Attribute;
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import org.opends.server.types.AttributeType;
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import org.opends.server.types.Entry;
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import org.opends.server.types.Modification;
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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;
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/** Last time when a value was added. */
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private CSN addTime;
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/** Last added value. */
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private ByteString value;
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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;
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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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@Override
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public Set<AttrValueHistorical> getValuesHistorical()
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{
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if (addTime != null)
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{
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return Collections.singleton(new AttrValueHistorical(value, addTime, null));
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}
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return Collections.emptySet();
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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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Attribute modAttr = mod.getAttribute();
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ByteString newValue = getSingleValue(modAttr);
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switch (mod.getModificationType().asEnum())
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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 = 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 = 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 = 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 = 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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@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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Attribute modAttr = mod.getAttribute();
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ByteString newValue = getSingleValue(modAttr);
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boolean conflict = false;
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switch (mod.getModificationType().asEnum())
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{
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case DELETE:
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if (csn.isNewerThan(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.isNewerThan(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 = 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 == ADD || lastMod == REPL)
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{
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if (csn.isNewerThan(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 = 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.isNewerThanOrEqualTo(deleteTime) && csn.isOlderThan(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 = REPL;
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}
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else
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{
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if (csn.isNewerThanOrEqualTo(deleteTime)
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&& (addTime == null || addTime.isOlderThan(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 = 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 == 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 = 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.isOlderThan(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 = 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 = 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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private ByteString getSingleValue(Attribute modAttr)
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{
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if (modAttr != null && !modAttr.isEmpty())
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{
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return modAttr.iterator().next();
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}
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return null;
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}
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@Override
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public void assign(HistAttrModificationKey histKey, ByteString 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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{
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this.value = value;
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}
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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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{
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this.value = value;
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}
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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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