/*
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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 Sun Microsystems, Inc.
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*/
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package org.opends.server.api;
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import org.opends.server.types.AttributeValue;
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import org.opends.server.types.ByteString;
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import org.opends.server.types.ConditionResult;
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import static org.opends.server.loggers.Debug.*;
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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 equality matching.
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*/
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public abstract class EqualityMatchingRule
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extends MatchingRule
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{
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/**
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* The fully-qualified name of this class for debugging purposes.
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*/
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private static final String CLASS_NAME =
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"org.opends.server.api.EqualityMatchingRule";
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/**
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* Indicates whether the two provided normalized values are equal to
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* each other.
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*
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* @param value1 The normalized form of the first value to
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* compare.
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* @param value2 The normalized form of the second value to
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* compare.
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*
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* @return <CODE>true</CODE> if the provided values are equal, or
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* <CODE>false</CODE> if not.
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*/
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public abstract boolean areEqual(ByteString value1,
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ByteString value2);
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/**
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* Indicates whether the provided attribute value should be
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* considered a match for the given assertion value. This will only
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* be used for the purpose of extensible matching. Other forms of
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* matching against equality matching rules should use the
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* <CODE>areEqual</CODE> method.
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*
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* @param attributeValue The attribute value in a form that has
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* been normalized according to this
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* matching rule.
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* @param assertionValue The assertion value in a form that has
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* been normalized according to this
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* matching rule.
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*
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* @return <CODE>true</CODE> if the attribute value should be
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* considered a match for the provided assertion value, or
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* <CODE>false</CODE> if not.
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*/
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public ConditionResult valuesMatch(ByteString attributeValue,
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ByteString assertionValue)
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{
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assert debugEnter(CLASS_NAME, "valuesMatch",
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String.valueOf(attributeValue),
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String.valueOf(assertionValue));
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if (areEqual(attributeValue, assertionValue))
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{
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return ConditionResult.TRUE;
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}
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else
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{
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return ConditionResult.FALSE;
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}
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}
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/**
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* Generates a hash code for the provided attribute value. This
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* version of the method will simply create a hash code from the
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* normalized form of the attribute value. For matching rules
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* explicitly designed to work in cases where byte-for-byte
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* comparisons of normalized values is not sufficient for
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* determining equality (e.g., if the associated attribute syntax is
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* based on hashed or encrypted values), then this method must be
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* overridden to provide an appropriate implementation for that
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* case.
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*
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* @param attributeValue The attribute value for which to generate
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* the hash code.
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*
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* @return The hash code generated for the provided attribute
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* value.
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*/
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public int generateHashCode(AttributeValue attributeValue)
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{
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assert debugEnter(CLASS_NAME, "generateHashCode",
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String.valueOf(attributeValue));
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try
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{
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return attributeValue.getNormalizedValue().hashCode();
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}
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catch (Exception e)
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{
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assert debugException(CLASS_NAME, "generateHashCode", e);
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try
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{
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return attributeValue.getValue().hashCode();
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}
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catch (Exception e2)
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{
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assert debugException(CLASS_NAME, "generateHashCode", e2);
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return 0;
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}
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}
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}
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}
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