/*
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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 2006-2010 Sun Microsystems, Inc.
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* Portions Copyright 2014-2015 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.opends.server.types.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 format version used by this class to encode and decode a ByteString. */
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static final byte FORMAT_VERSION = 0x01;
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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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final ByteStringBuilder builder = new ByteStringBuilder(128);
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final int startSize = dn.size() - prefixRDNs - 1;
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for (int i = startSize; i >= 0; i--)
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{
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builder.append(DN.NORMALIZED_RDN_SEPARATOR);
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dn.getRDN(i).toNormalizedByteString(builder);
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}
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return builder.toByteString();
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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) == DN.NORMALIZED_RDN_SEPARATOR && key.byteAt(index - 1) != DN.NORMALIZED_ESC_BYTE;
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}
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static ByteStringBuilder beforeKey(final ByteSequence key)
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{
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final ByteStringBuilder beforeKey = new ByteStringBuilder(key.length() + 1);
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beforeKey.append(key);
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beforeKey.append((byte) 0x00);
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return beforeKey;
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}
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static ByteStringBuilder afterKey(final ByteSequence key)
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{
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final ByteStringBuilder afterKey = new ByteStringBuilder(key.length() + 1);
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afterKey.append(key);
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afterKey.append((byte) 0x01);
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return afterKey;
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}
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}
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