/*
|
* CDDL HEADER START
|
*
|
* The contents of this file are subject to the terms of the
|
* Common Development and Distribution License, Version 1.0 only
|
* (the "License"). You may not use this file except in compliance
|
* with the License.
|
*
|
* You can obtain a copy of the license at
|
* trunk/opends/resource/legal-notices/OpenDS.LICENSE
|
* or https://OpenDS.dev.java.net/OpenDS.LICENSE.
|
* See the License for the specific language governing permissions
|
* and limitations under the License.
|
*
|
* When distributing Covered Code, include this CDDL HEADER in each
|
* file and include the License file at
|
* trunk/opends/resource/legal-notices/OpenDS.LICENSE. If applicable,
|
* add the following below this CDDL HEADER, with the fields enclosed
|
* by brackets "[]" replaced with your own identifying information:
|
* Portions Copyright [yyyy] [name of copyright owner]
|
*
|
* CDDL HEADER END
|
*
|
*
|
* Copyright 2008 Sun Microsystems, Inc.
|
*/
|
package org.opends.server.backends.jeb;
|
|
|
|
import java.util.List;
|
|
import org.opends.server.types.Attribute;
|
import org.opends.server.types.AttributeType;
|
import org.opends.server.types.AttributeValue;
|
import org.opends.server.types.Entry;
|
import org.opends.server.types.SortKey;
|
import org.opends.server.types.SortOrder;
|
|
|
/**
|
* This class defines a data structure that holds a set of attribute values that
|
* are associated with a sort order for a given entry. Any or all of the
|
* attribute values may be {@code null} if the entry does not include any values
|
* for the attribute type targeted by the corresponding sort key.
|
* <BR><BR>
|
* This class implements the {@code Comparable} interface and may therefore be
|
* used to order the elements in components like {@code TreeMap} and
|
* {@code TreeSet}.
|
*/
|
public class SortValues
|
implements Comparable<SortValues>
|
{
|
// The set of sort keys in this sort order.
|
private AttributeValue[] values;
|
|
// The entry ID for the entry associated with this sort values.
|
private EntryID entryID;
|
|
// The sort order for this set of sort values.
|
private SortOrder sortOrder;
|
|
|
|
/**
|
* Creates a new sort values object with the provided information.
|
*
|
* @param entryID The entry ID for the entry associated with this set of
|
* values.
|
* @param values The attribute values for this sort values.
|
* @param sortOrder The sort order to use to obtain the necessary values.
|
*/
|
public SortValues(EntryID entryID, AttributeValue[] values,
|
SortOrder sortOrder)
|
{
|
this.entryID = entryID;
|
this.sortOrder = sortOrder;
|
this.values = values;
|
}
|
|
/**
|
* Creates a new sort values object with the provided information.
|
*
|
* @param entryID The entry ID for the entry associated with this set of
|
* values.
|
* @param entry The entry containing the values to extract and use when
|
* sorting.
|
* @param sortOrder The sort order to use to obtain the necessary values.
|
*/
|
public SortValues(EntryID entryID, Entry entry, SortOrder sortOrder)
|
{
|
this.entryID = entryID;
|
this.sortOrder = sortOrder;
|
|
SortKey[] sortKeys = sortOrder.getSortKeys();
|
values = new AttributeValue[sortKeys.length];
|
for (int i=0; i < sortKeys.length; i++)
|
{
|
SortKey sortKey = sortKeys[i];
|
AttributeType attrType = sortKey.getAttributeType();
|
List<Attribute> attrList = entry.getAttribute(attrType);
|
if (attrList != null)
|
{
|
AttributeValue sortValue = null;
|
|
// There may be multiple versions of this attribute in the target entry
|
// (e.g., with different sets of options), and it may also be a
|
// multivalued attribute. In that case, we need to find the value that
|
// is the best match for the corresponding sort key (i.e., for sorting
|
// in ascending order, we want to find the lowest value; for sorting in
|
// descending order, we want to find the highest value). This is
|
// handled by the SortKey.compareValues method.
|
for (Attribute a : attrList)
|
{
|
for (AttributeValue v : a)
|
{
|
if (sortValue == null)
|
{
|
sortValue = v;
|
}
|
else if (sortKey.compareValues(v, sortValue) < 0)
|
{
|
sortValue = v;
|
}
|
}
|
}
|
|
values[i] = sortValue;
|
}
|
}
|
}
|
|
|
|
/**
|
* Compares this set of sort values with the provided set of values to
|
* determine their relative order in a sorted list.
|
*
|
* @param sortValues The set of values to compare against this sort values.
|
* It must also have the same sort order as this set of
|
* values.
|
*
|
* @return A negative value if this sort values object should come before the
|
* provided values in a sorted list, a positive value if this sort
|
* values object should come after the provided values in a sorted
|
* list, or zero if there is no significant difference in their
|
* relative order.
|
*/
|
public int compareTo(SortValues sortValues)
|
{
|
SortKey[] sortKeys = sortOrder.getSortKeys();
|
|
for (int i=0; i < values.length; i++)
|
{
|
int compareValue = sortKeys[i].compareValues(values[i],
|
sortValues.values[i]);
|
if (compareValue != 0)
|
{
|
return compareValue;
|
}
|
}
|
|
// If we've gotten here, then we can't tell a difference between the sets of
|
// sort values, so sort based on entry ID.
|
long idDifference = (entryID.longValue() - sortValues.entryID.longValue());
|
if (idDifference < 0)
|
{
|
return -1;
|
}
|
else if (idDifference > 0)
|
{
|
return 1;
|
}
|
else
|
{
|
return 0;
|
}
|
}
|
|
|
|
/**
|
* Compares the first element in this set of sort values with the provided
|
* assertion value to determine whether the assertion value is greater than or
|
* equal to the initial sort value. This is used during VLV processing to
|
* find the offset by assertion value.
|
*
|
* @param assertionValue The assertion value to compare against the first
|
* sort value.
|
*
|
* @return A negative value if the provided assertion value should come
|
* before the first sort value, zero if the provided assertion value
|
* is equal to the first sort value, or a positive value if the
|
* provided assertion value should come after the first sort value.
|
*/
|
public int compareTo(AttributeValue assertionValue)
|
{
|
SortKey sortKey = sortOrder.getSortKeys()[0];
|
return sortKey.compareValues(values[0], assertionValue);
|
}
|
|
|
|
/**
|
* Retrieves a string representation of this sort values object.
|
*
|
* @return A string representation of this sort values object.
|
*/
|
public String toString()
|
{
|
StringBuilder buffer = new StringBuilder();
|
toString(buffer);
|
return buffer.toString();
|
}
|
|
|
|
/**
|
* Appends a string representation of this sort values object to the provided
|
* buffer.
|
*
|
* @param buffer The buffer to which the information should be appended.
|
*/
|
public void toString(StringBuilder buffer)
|
{
|
buffer.append("SortValues(");
|
|
SortKey[] sortKeys = sortOrder.getSortKeys();
|
for (int i=0; i < sortKeys.length; i++)
|
{
|
if (i > 0)
|
{
|
buffer.append(",");
|
}
|
|
if (sortKeys[i].ascending())
|
{
|
buffer.append("+");
|
}
|
else
|
{
|
buffer.append("-");
|
}
|
|
buffer.append(sortKeys[i].getAttributeType().getNameOrOID());
|
buffer.append("=");
|
if (values[i] == null)
|
{
|
buffer.append("null");
|
}
|
else
|
{
|
buffer.append(values[i].getValue().toString());
|
}
|
}
|
|
buffer.append(", id=");
|
buffer.append(entryID.toString());
|
buffer.append(")");
|
}
|
|
/**
|
* Retrieve the attribute values in this sort values.
|
*
|
* @return The array of attribute values for this sort values.
|
*/
|
public AttributeValue[] getValues()
|
{
|
return values;
|
}
|
|
/**
|
* Retrieve the entry ID in this sort values.
|
*
|
* @return The entry ID for this sort values.
|
*/
|
public long getEntryID()
|
{
|
return entryID.longValue();
|
}
|
}
|
