/*
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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 2006-2009 Sun Microsystems, Inc.
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* Portions Copyright 2014 ForgeRock AS
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*/
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package org.opends.server.api;
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import java.util.List;
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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.DecodeException;
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/**
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* This class defines the set of methods and structures that must be
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* implemented by a Directory Server module that implements a matching
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* rule used for substring matching.
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*/
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@org.opends.server.types.PublicAPI(
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stability=org.opends.server.types.StabilityLevel.VOLATILE,
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mayInstantiate=false,
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mayExtend=true,
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mayInvoke=false)
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public abstract class SubstringMatchingRule
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extends AbstractMatchingRule
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implements MatchingRule
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{
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/**
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* Normalizes the provided value fragment into a form that can be
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* used to efficiently compare values.
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*
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* @param substring The value fragment to be normalized.
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*
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* @return The normalized form of the value fragment.
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*
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* @throws DecodeException If the provided value fragment is
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* not acceptable according to the
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* associated syntax.
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*/
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public abstract ByteString normalizeSubstring(
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ByteSequence substring) throws DecodeException;
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/**
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* Determines whether the provided value matches the given substring
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* filter components. Note that any of the substring filter
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* components may be {@code null} but at least one of them must be
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* non-{@code null}.
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*
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* @param value The normalized value against which to
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* compare the substring components.
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* @param subInitial The normalized substring value fragment
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* that should appear at the beginning of
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* the target value.
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* @param subAnyElements The normalized substring value fragments
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* that should appear in the middle of the
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* target value.
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* @param subFinal The normalized substring value fragment
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* that should appear at the end of the
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* target value.
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*
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* @return {@code true} if the provided value does match the given
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* substring components, or {@code false} if not.
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*/
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public boolean valueMatchesSubstring(ByteSequence value,
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ByteSequence subInitial,
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List<ByteSequence> subAnyElements,
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ByteSequence subFinal)
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{
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int valueLength = value.length();
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int pos = 0;
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if (subInitial != null)
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{
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int initialLength = subInitial.length();
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if (initialLength > valueLength)
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{
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return false;
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}
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for (; pos < initialLength; pos++)
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{
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if (subInitial.byteAt(pos) != value.byteAt(pos))
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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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if ((subAnyElements != null) && (! subAnyElements.isEmpty()))
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{
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for (ByteSequence element : subAnyElements)
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{
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int anyLength = element.length();
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if(anyLength == 0)
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continue;
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int end = valueLength - anyLength;
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boolean match = false;
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for (; pos <= end; pos++)
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{
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if (element.byteAt(0) == value.byteAt(pos))
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{
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boolean subMatch = true;
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for (int i=1; i < anyLength; i++)
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{
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if (element.byteAt(i) != value.byteAt(pos+i))
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{
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subMatch = false;
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break;
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}
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}
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if (subMatch)
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{
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match = subMatch;
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break;
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}
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}
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}
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if (match)
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{
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pos += anyLength;
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}
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else
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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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if (subFinal != null)
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{
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int finalLength = subFinal.length();
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if ((valueLength - finalLength) < pos)
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{
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return false;
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}
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pos = valueLength - finalLength;
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for (int i=0; i < finalLength; i++,pos++)
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{
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if (subFinal.byteAt(i) != value.byteAt(pos))
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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 true;
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}
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}
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