/*
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* The contents of this file are subject to the terms of the Common Development and
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* Distribution License (the License). You may not use this file except in compliance with the
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* License.
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*
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* You can obtain a copy of the License at legal/CDDLv1.0.txt. See the License for the
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* specific language governing permission and limitations under the License.
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*
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* When distributing Covered Software, include this CDDL Header Notice in each file and include
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* the License file at legal/CDDLv1.0.txt. If applicable, add the following below the CDDL
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* Header, with the fields enclosed by brackets [] replaced by your own identifying
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* information: "Portions Copyright [year] [name of copyright owner]".
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*
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* Copyright 2006-2010 Sun Microsystems, Inc.
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* Portions Copyright 2014-2016 ForgeRock AS.
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*/
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package org.opends.server.backends.pluggable;
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import org.forgerock.opendj.ldap.ByteSequence;
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import org.forgerock.opendj.ldap.ByteString;
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import org.forgerock.opendj.ldap.ByteStringBuilder;
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import org.forgerock.opendj.ldap.DN;
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/** Handles the disk representation of LDAP data. */
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public class DnKeyFormat
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{
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// The following fields have been copied from the DN class in the SDK
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/** RDN separator for normalized byte string of a DN. */
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private static final byte NORMALIZED_RDN_SEPARATOR = 0x00;
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/** AVA separator for normalized byte string of a DN. */
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private static final byte NORMALIZED_AVA_SEPARATOR = 0x01;
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/** Escape byte for normalized byte string of a DN. */
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private static final byte NORMALIZED_ESC_BYTE = 0x02;
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/**
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* Find the length of bytes that represents the superior DN of the given DN
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* key. The superior DN is represented by the initial bytes of the DN key.
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*
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* @param dnKey
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* The key value of the DN.
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* @return The length of the superior DN or -1 if the given dn is the root DN
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* or 0 if the superior DN is removed.
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*/
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static int findDNKeyParent(ByteSequence dnKey)
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{
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if (dnKey.length() == 0)
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{
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// This is the root or base DN
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return -1;
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}
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// We will walk backwards through the buffer
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// and find the first unescaped NORMALIZED_RDN_SEPARATOR
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for (int i = dnKey.length() - 1; i >= 0; i--)
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{
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if (positionIsRDNSeparator(dnKey, i))
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{
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return i;
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}
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}
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return 0;
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}
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/**
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* Create a DN key from an entry DN.
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*
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* @param dn The entry DN.
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* @param prefixRDNs The number of prefix RDNs to remove from the encoded
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* representation.
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* @return A ByteString containing the key.
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*/
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static ByteString dnToDNKey(DN dn, int prefixRDNs)
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{
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return dn.localName(dn.size() - prefixRDNs).toNormalizedByteString();
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}
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/**
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* Returns a best effort conversion from key to a human readable DN.
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* @param key the index key
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* @return a best effort conversion from key to a human readable DN.
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*/
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static String keyToDNString(ByteString key)
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{
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return key.toByteString().toASCIIString();
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}
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private static boolean positionIsRDNSeparator(ByteSequence key, int index)
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{
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return index > 0
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&& key.byteAt(index) == NORMALIZED_RDN_SEPARATOR && key.byteAt(index - 1) != NORMALIZED_ESC_BYTE;
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}
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static ByteStringBuilder beforeFirstChildOf(final ByteSequence key)
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{
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final ByteStringBuilder beforeKey = new ByteStringBuilder(key.length() + 1);
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beforeKey.appendBytes(key);
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beforeKey.appendByte(NORMALIZED_RDN_SEPARATOR);
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return beforeKey;
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}
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static ByteStringBuilder afterLastChildOf(final ByteSequence key)
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{
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final ByteStringBuilder afterKey = new ByteStringBuilder(key.length() + 1);
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afterKey.appendBytes(key);
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afterKey.appendByte(NORMALIZED_AVA_SEPARATOR);
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return afterKey;
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}
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/**
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* Check if two DN have a parent-child relationship.
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*
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* @param parent
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* The potential parent
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* @param child
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* The potential child of parent
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* @return true if child is a direct children of parent, false otherwise.
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*/
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static boolean isChild(ByteSequence parent, ByteSequence child)
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{
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if (!child.startsWith(parent))
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{
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return false;
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}
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// Immediate children should only have one RDN separator past the parent length
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int nbSeparator = 0;
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for (int i = parent.length() ; i < child.length(); i++)
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{
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if (child.byteAt(i) == NORMALIZED_RDN_SEPARATOR)
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{
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nbSeparator++;
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if (nbSeparator > 1)
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{
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return false;
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}
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}
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}
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return nbSeparator == 1;
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}
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}
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