/*
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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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* Portions Copyright 2006-2007 Sun Microsystems, Inc.
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*/
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package org.opends.server.backends.jeb;
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import com.sleepycat.je.Transaction;
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import java.util.*;
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import org.opends.server.types.*;
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import org.opends.server.protocols.asn1.ASN1OctetString;
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import static org.opends.server.loggers.debug.DebugLogger.*;
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import org.opends.server.loggers.debug.DebugTracer;
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import org.opends.server.api.ApproximateMatchingRule;
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/**
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* An implementation of an Indexer for attribute approximate matching.
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*/
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public class ApproximateIndexer extends Indexer
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{
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/**
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* The tracer object for the debug logger.
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*/
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private static final DebugTracer TRACER = getTracer();
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/**
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* The comparator for index keys generated by this class.
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*/
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private static final Comparator<byte[]> comparator =
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new AttributeIndex.KeyComparator();
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/**
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* The attribute type approximate matching rule.
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*/
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private ApproximateMatchingRule approximateRule;
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/**
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* The attribute type for which this instance will
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* generate index keys.
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*/
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private AttributeType attributeType;
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/**
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* Create a new attribute approximate indexer for the given index
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* configuration.
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* @param attributeType The attribute type for which an indexer is
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* required.
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*/
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public ApproximateIndexer(AttributeType attributeType)
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{
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this.attributeType = attributeType;
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this.approximateRule = attributeType.getApproximateMatchingRule();
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}
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/**
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* Get a string representation of this object. The returned value is
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* used to name an index created using this object.
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* @return A string representation of this object.
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*/
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public String toString()
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{
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return attributeType.getNameOrOID() + ".approximate";
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}
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/**
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* Get the comparator that must be used to compare index keys
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* generated by this class.
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*
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* @return A byte array comparator.
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*/
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public Comparator<byte[]> getComparator()
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{
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return comparator;
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}
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/**
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* Generate the set of index keys for an entry.
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*
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* @param txn A database transaction to be used if the database need to be
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* accessed in the course of generating the index keys.
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* @param entry The entry.
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* @param keys The set into which the generated keys will be inserted.
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*/
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public void indexEntry(Transaction txn, Entry entry,
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Set<ASN1OctetString> keys)
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{
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List<Attribute> attrList =
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entry.getAttribute(attributeType);
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if (attrList != null)
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{
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indexAttribute(attrList, keys);
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}
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}
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/**
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* Generate the set of index keys to be added and the set of index keys
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* to be deleted for an entry that has been replaced.
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*
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* @param txn A database transaction to be used if the database need to be
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* accessed in the course of generating the index keys.
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* @param oldEntry The original entry contents.
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* @param newEntry The new entry contents.
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* @param addKeys The set into which the keys to be added will be inserted.
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* @param delKeys The set into which the keys to be deleted will be inserted.
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*/
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public void replaceEntry(Transaction txn,
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Entry oldEntry, Entry newEntry,
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Set<ASN1OctetString> addKeys,
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Set<ASN1OctetString> delKeys)
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{
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List<Attribute> attrList;
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attrList = oldEntry.getAttribute(attributeType);
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Set<ASN1OctetString> oldSet = new HashSet<ASN1OctetString>();
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indexAttribute(attrList, oldSet);
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attrList = newEntry.getAttribute(attributeType);
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Set<ASN1OctetString> newSet = new HashSet<ASN1OctetString>();
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indexAttribute(attrList, newSet);
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HashSet<ASN1OctetString> removeSet = new HashSet<ASN1OctetString>(oldSet);
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removeSet.removeAll(newSet);
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for (ASN1OctetString k : removeSet)
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{
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delKeys.add(k);
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}
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HashSet<ASN1OctetString> addSet = new HashSet<ASN1OctetString>(newSet);
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addSet.removeAll(oldSet);
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for (ASN1OctetString k : addSet)
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{
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addKeys.add(k);
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}
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}
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/**
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* Generate the set of index keys to be added and the set of index keys
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* to be deleted for an entry that was modified.
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*
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* @param txn A database transaction to be used if the database need to be
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* accessed in the course of generating the index keys.
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* @param oldEntry The original entry contents.
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* @param newEntry The new entry contents.
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* @param mods The set of modifications that were applied to the entry.
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* @param addKeys The set into which the keys to be added will be inserted.
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* @param delKeys The set into which the keys to be deleted will be inserted.
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*/
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public void modifyEntry(Transaction txn, Entry oldEntry, Entry newEntry,
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List<Modification> mods,
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Set<ASN1OctetString> addKeys,
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Set<ASN1OctetString> delKeys)
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{
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replaceEntry(txn, oldEntry, newEntry, addKeys, delKeys);
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}
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/**
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* Generate the set of index keys for an attribute.
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* @param attrList The attribute to be indexed.
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* @param keys The set into which the keys will be inserted.
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*/
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private void indexAttribute(List<Attribute> attrList,
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Set<ASN1OctetString> keys)
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{
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if (attrList == null) return;
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for (Attribute attr : attrList)
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{
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indexValues(attr.getValues(), keys);
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}
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}
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/**
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* Generate the set of index keys for a set of attribute values.
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* @param values The set of attribute values to be indexed.
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* @param keys The set into which the keys will be inserted.
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*/
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private void indexValues(Set<AttributeValue> values,
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Set<ASN1OctetString> keys)
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{
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if (values == null) return;
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for (AttributeValue value : values)
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{
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try
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{
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byte[] keyBytes =
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approximateRule.normalizeValue(value.getValue()).value();
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keys.add(new ASN1OctetString(keyBytes));
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}
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catch (DirectoryException e)
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{
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if (debugEnabled())
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{
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TRACER.debugCaught(DebugLogLevel.ERROR, e);
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}
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}
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}
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}
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}
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