/*
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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.schema;
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import org.opends.server.api.EqualityMatchingRule;
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import org.opends.server.config.ConfigEntry;
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import org.opends.server.config.ConfigException;
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import org.opends.server.protocols.asn1.ASN1OctetString;
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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.DirectoryException;
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import org.opends.server.types.InitializationException;
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import static org.opends.server.loggers.Debug.*;
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import static org.opends.server.messages.MessageHandler.*;
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import static org.opends.server.messages.SchemaMessages.*;
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import static org.opends.server.schema.SchemaConstants.*;
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import static org.opends.server.util.StaticUtils.*;
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/**
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* This class implements the directoryStringFirstComponentMatch matching rule
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* defined in X.520 and referenced in RFC 2252. This rule is intended for use
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* with attributes whose values contain a set of parentheses enclosing a
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* space-delimited set of names and/or name-value pairs (like attribute type or
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* objectclass descriptions) in which the "first component" is the first item
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* after the opening parenthesis.
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*/
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public class DirectoryStringFirstComponentEqualityMatchingRule
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extends EqualityMatchingRule
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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 = "org.opends.server.schema." +
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"DirectoryStringFirstComponentEqualityMatchingRule";
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/**
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* Creates a new instance of this directoryStringFirstComponentMatch matching
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* rule.
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*/
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public DirectoryStringFirstComponentEqualityMatchingRule()
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{
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super();
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assert debugConstructor(CLASS_NAME);
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}
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/**
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* Initializes this matching rule based on the information in the provided
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* configuration entry.
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*
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* @param configEntry The configuration entry that contains the information
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* to use to initialize this matching rule.
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*
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* @throws ConfigException If an unrecoverable problem arises in the
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* process of performing the initialization.
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*
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* @throws InitializationException If a problem that is not
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* configuration-related occurs during
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* initialization.
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*/
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public void initializeMatchingRule(ConfigEntry configEntry)
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throws ConfigException, InitializationException
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{
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assert debugEnter(CLASS_NAME, "initializeMatchingRule",
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String.valueOf(configEntry));
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// No initialization is required.
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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 <CODE>null</CODE> if
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* it does not have a name.
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*/
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public String getName()
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{
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assert debugEnter(CLASS_NAME, "getName");
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return EMR_DIRECTORY_STRING_FIRST_COMPONENT_NAME;
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}
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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 String getOID()
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{
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assert debugEnter(CLASS_NAME, "getOID");
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return EMR_DIRECTORY_STRING_FIRST_COMPONENT_OID;
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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 <CODE>null</CODE> if
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* there is none.
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*/
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public String getDescription()
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{
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assert debugEnter(CLASS_NAME, "getDescription");
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// There is no standard description for this matching rule.
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return null;
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}
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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 associated.
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*/
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public String getSyntaxOID()
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{
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assert debugEnter(CLASS_NAME, "getSyntaxOID");
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return SYNTAX_DIRECTORY_STRING_OID;
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}
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/**
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* Retrieves the normalized form of the provided value, which is best suited
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* for efficiently performing matching operations on that 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 according to
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* the associated attribute syntax.
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*/
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public ByteString normalizeValue(ByteString value)
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throws DirectoryException
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{
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assert debugEnter(CLASS_NAME, "normalizeValue", String.valueOf(value));
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StringBuilder buffer = new StringBuilder();
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toLowerCase(value.value(), buffer, true);
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int bufferLength = buffer.length();
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if (bufferLength == 0)
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{
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if (value.value().length > 0)
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{
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// This should only happen if the value is composed entirely of spaces.
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// In that case, the normalized value is a single space.
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return new ASN1OctetString(" ");
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}
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else
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{
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// The value is empty, so it is already normalized.
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return new ASN1OctetString();
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}
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}
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// Replace any consecutive spaces with a single space.
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for (int pos = bufferLength-1; pos > 0; pos--)
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{
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if (buffer.charAt(pos) == ' ')
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{
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if (buffer.charAt(pos-1) == ' ')
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{
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buffer.delete(pos, pos+1);
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}
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}
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}
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return new ASN1OctetString(buffer.toString());
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}
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/**
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* Indicates whether the two provided normalized values are equal to each
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* other.
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*
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* @param value1 The normalized form of the first value to compare.
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* @param value2 The normalized form of the second value to 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 boolean areEqual(ByteString value1, ByteString value2)
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{
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assert debugEnter(CLASS_NAME, "areEqual", String.valueOf(value1),
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String.valueOf(value2));
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// For this purpose, the first value will be considered the attribute value,
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// and the second the assertion value. The attribute value must start with
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// an open parenthesis, followed by one or more spaces.
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String value1String = value1.stringValue();
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int value1Length = value1String.length();
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if ((value1Length == 0) || (value1String.charAt(0) != '('))
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{
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// They cannot be equal if the attribute value is empty or doesn't start
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// with an open parenthesis.
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return false;
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}
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char c;
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int pos = 1;
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while ((pos < value1Length) && ((c = value1String.charAt(pos)) == ' '))
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{
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pos++;
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}
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if (pos >= value1Length)
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{
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// We hit the end of the value before finding a non-space character.
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return false;
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}
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// The current position must be the start position for the value. Keep
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// reading until we find the next space.
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int startPos = pos++;
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while ((pos < value1Length) && ((c = value1String.charAt(pos)) != ' '))
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{
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pos++;
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}
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if (pos >= value1Length)
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{
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// We hit the end of the value before finding the next space.
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return false;
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}
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// Grab the substring between the start pos and the current pos and compare
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// it with the assertion value.
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String compareStr = value1String.substring(startPos, pos);
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String value2String = value2.stringValue();
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return value2String.equals(compareStr);
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}
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/**
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* Generates a hash code for the provided attribute value. This version of
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* the method will simply create a hash code from the normalized form of the
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* attribute value. For matching rules explicitly designed to work in cases
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* where byte-for-byte comparisons of normalized values is not sufficient for
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* determining equality (e.g., if the associated attribute syntax is based on
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* hashed or encrypted values), then this method must be overridden to provide
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* an appropriate implementation for that case.
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*
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* @param attributeValue The attribute value for which to generate the hash
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* code.
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*
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* @return The hash code generated for the provided attribute value.*/
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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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// In this case, we'll always return the same value because the matching
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// isn't based on the entire value.
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return 1;
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}
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}
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