/*
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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.api;
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import org.opends.messages.Message;
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import java.util.List;
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import org.opends.server.admin.std.server.MatchingRuleCfg;
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import org.opends.server.config.ConfigException;
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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 org.opends.server.types.DirectoryException;
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import org.opends.server.types.InitializationException;
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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.
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*
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* @param <T> The type of configuration handled by this matching
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* rule.
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*/
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public abstract class MatchingRule<T extends MatchingRuleCfg>
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{
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/**
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* Initializes this matching rule based on the information in the
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* provided configuration entry.
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*
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* @param configuration The configuration to use to intialize this
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* matching rule.
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*
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* @throws ConfigException If an unrecoverable problem arises in
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* the process of performing the
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* initialization.
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*
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* @throws InitializationException If a problem that is not
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* configuration-related occurs
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* during initialization.
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*/
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public abstract void initializeMatchingRule(T configuration)
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throws ConfigException, InitializationException;
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/**
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* Indicates whether the provided configuration is acceptable for
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* this matching rule. It should be possible to call this method on
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* an uninitialized matching rule instance in order to determine
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* whether the matching rule would be able to use the provided
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* configuration.
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* <BR><BR>
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* Note that implementations which use a subclass of the provided
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* configuration class will likely need to cast the configuration
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* to the appropriate subclass type.
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*
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* @param configuration The matching rule configuration for
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* which to make the determination.
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* @param unacceptableReasons A list that may be used to hold the
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* reasons that the provided
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* configuration is not acceptable.
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*
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* @return {@code true} if the provided configuration is acceptable
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* for this matching rule, or {@code false} if not.
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*/
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public boolean isConfigurationAcceptable(
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MatchingRuleCfg configuration,
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List<Message> unacceptableReasons)
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{
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// This default implementation does not perform any special
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// validation. It should be overridden by matching rule
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// implementations that wish to perform more detailed validation.
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return true;
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}
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/**
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* Performs any finalization that may be needed whenever this
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* matching rule is taken out of service.
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*/
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public void finalizeMatchingRule()
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{
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// No implementation is required by default.
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}
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/**
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* Retrieves the common name for this matching rule.
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*
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* @return The common name for this matching rule, or
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* <CODE>null</CODE> if it does not have a name.
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*/
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public abstract String getName();
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/**
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* Retrieves the OID for this matching rule.
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*
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* @return The OID for this matching rule.
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*/
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public abstract String getOID();
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/**
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* Retrieves the name or OID for this matching rule. If it has a
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* name, then it will be returned. Otherwise, the OID will be
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* returned.
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*
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* @return The name or OID for this matching rule.
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*/
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public String getNameOrOID()
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{
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String name = getName();
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if ((name == null) || (name.length() == 0))
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{
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return getOID();
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}
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else
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{
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return name;
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}
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}
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/**
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* Retrieves the description for this matching rule.
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*
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* @return The description for this matching rule, or
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* <CODE>null</CODE> if there is none.
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*/
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public abstract String getDescription();
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/**
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* Retrieves the OID of the syntax with which this matching rule is
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* associated.
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*
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* @return The OID of the syntax with which this matching rule is
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* associated.
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*/
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public abstract String getSyntaxOID();
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/**
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* Indicates whether this matching rule is declared "OBSOLETE".
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* The default implementation will always return <CODE>false</CODE>.
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* If that is not acceptable for a particular matching rule
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* implementation, then it should override this method and perform
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* the appropriate processing to return the correct value.
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*
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* @return <CODE>true</CODE> if this matching rule is declared
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* "OBSOLETE", or <CODE>false</CODE> if not.
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*/
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public boolean isObsolete()
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{
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return false;
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}
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/**
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* Retrieves the normalized form of the provided value, which is
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* best suite for efficiently performing matching operations on that
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* value.
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*
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* @param value The value to be normalized.
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*
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* @return The normalized version of the provided value.
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*
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* @throws DirectoryException If the provided value is invalid
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* according to the associated
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* attribute syntax.
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*/
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public abstract ByteString normalizeValue(ByteString value)
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throws DirectoryException;
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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. Subclasses
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* should define more specific methods that are appropriate to the
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* matching rule type.
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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,
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* <CODE>FALSE</CODE> if it does not match, or
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* <CODE>UNDEFINED</CODE> if the result is undefined.
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*/
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public abstract ConditionResult
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valuesMatch(ByteString attributeValue,
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ByteString assertionValue);
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/**
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* Retrieves the hash code for this matching rule. It will be
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* calculated as the sum of the characters in the OID.
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*
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* @return The hash code for this matching rule.
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*/
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public int hashCode()
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{
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int hashCode = 0;
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String oidString = getOID();
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int oidLength = oidString.length();
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for (int i=0; i < oidLength; i++)
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{
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hashCode += oidString.charAt(i);
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}
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return hashCode;
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}
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/**
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* Indicates whether the provided object is equal to this matching
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* rule. The provided object will be considered equal to this
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* matching rule only if it is a matching rule with the same OID.
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*
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* @param o The object for which to make the determination.
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*
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* @return <CODE>true</CODE> if the provided object is equal to
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* this matching rule, or <CODE>false</CODE> if it is not.
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*/
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public boolean equals(Object o)
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{
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if (o == null)
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{
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return false;
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}
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if (this == o)
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{
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return true;
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}
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if (! (o instanceof MatchingRule))
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{
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return false;
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}
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return getOID().equals(((MatchingRule) o).getOID());
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}
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/**
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* Retrieves a string representation of this matching rule in the
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* format defined in RFC 2252.
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*
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* @return A string representation of this matching rule in the
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* format defined in RFC 2252.
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*/
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public String toString()
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{
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StringBuilder buffer = new StringBuilder();
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toString(buffer);
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return buffer.toString();
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}
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/**
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* Appends a string representation of this matching rule in the
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* format defined in RFC 2252 to the provided buffer.
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*
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* @param buffer The buffer to which the information should be
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* appended.
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*/
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public void toString(StringBuilder buffer)
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{
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buffer.append("( ");
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buffer.append(getOID());
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buffer.append(" NAME '");
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buffer.append(getName());
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String description = getDescription();
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if ((description != null) && (description.length() > 0))
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{
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buffer.append("' DESC '");
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buffer.append(description);
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}
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if (isObsolete())
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{
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buffer.append("' OBSOLETE SYNTAX ");
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}
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else
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{
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buffer.append("' SYNTAX ");
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}
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buffer.append(getSyntaxOID());
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buffer.append(" )");
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}
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}
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