netscape.ldap
Class LDAPCompareAttrNames

java.lang.Object
  |
  +--netscape.ldap.LDAPCompareAttrNames

public class LDAPCompareAttrNames

extends java.lang.Object

implements LDAPEntryComparator

Compares LDAP entries based on one or more attribute values.

To use this comparison for sorting search results, pass an object of this class to the sort method in LDAPSearchResults.

See Also:

LDAPEntryComparator, LDAPSearchResults.sort(netscape.ldap.LDAPEntryComparator)

Constructor Summary

LDAPCompareAttrNames(java.lang.String attribute)
Constructs a comparator that compares the string values of a named attribute in LDAP entries and sorts the entries in ascending order.

LDAPCompareAttrNames(java.lang.String[] attributes)
Constructs a comparator that compares the string values of a set of named attributes in LDAP entries and that sort the entries in ascending order.

LDAPCompareAttrNames(java.lang.String[] attributes, boolean[] ascendingFlags)
Constructs a comparator that compares the string values of a set of named attributes in LDAP entries and allows you to sort the entries in ascending or descending order.

LDAPCompareAttrNames(java.lang.String attribute, boolean ascendingFlag)
Constructs a comparator that compares the string values of a named attribute in LDAP entries and that allows you to sort entries either in ascending or descending order.

Method Summary

java.util.Locale	getLocale() Gets the locale, if any, used for collation.
boolean	isGreater(LDAPEntry greater, LDAPEntry less) Returns true if the value of the attribute in the first entry is greater than the value of the attribute in the second entry.
void	setLocale(java.util.Locale locale) Set the locale, if any, used for collation.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

LDAPCompareAttrNames

public LDAPCompareAttrNames(java.lang.String attribute)

Constructs a comparator that compares the string values of a named attribute in LDAP entries and sorts the entries in ascending order.

Parameters:

attribute - name of attribute for comparisons

LDAPCompareAttrNames

public LDAPCompareAttrNames(java.lang.String attribute,
                            boolean ascendingFlag)

Constructs a comparator that compares the string values of a named attribute in LDAP entries and that allows you to sort entries either in ascending or descending order.

Parameters:

attribute - name of attribute for comparisons

ascendingFlag - if true, sort in ascending order

LDAPCompareAttrNames

public LDAPCompareAttrNames(java.lang.String[] attributes)

Constructs a comparator that compares the string values of a set of named attributes in LDAP entries and that sort the entries in ascending order.

Use an array of strings to specify the set of attributes to use for sorting. If the values of the first attribute (the name specified in attribute[0]) are equal, then the values of the next attribute are compared.

For example, if attributes[0] = "cn" and attributes[1]="uid", results are first sorted by the cn attribute. If two entries have the same value for cn, then the uid attribute is used to sort the entries.

Parameters:

attributes - array of the attribute names used for comparisons

LDAPCompareAttrNames

public LDAPCompareAttrNames(java.lang.String[] attributes,
                            boolean[] ascendingFlags)

Constructs a comparator that compares the string values of a set of named attributes in LDAP entries and allows you to sort the entries in ascending or descending order.

Use an array of strings to specify the set of attributes to use for sorting. If the values of the first attribute (the name specified in attribute[0]) are equal, then the values of the next attribute are compared.

For example, if attributes[0] = "cn" and attributes[1]="uid", results are first sorted by the cn attribute. If two entries have the same value for cn, then the uid attribute is used to sort the entries.

Use an array of boolean values to specify whether each attribute should be sorted in ascending or descending order. For example, suppose that attributes[0] = "cn" and attributes[1]="roomNumber". If ascendingFlags[0]=true and ascendingFlags[1]=false, attributes are sorted first by cn in ascending order, then by roomNumber in descending order.

If the size of the array of attribute names is not the same as the size of the array of boolean values, an LDAPException is thrown.

Parameters:

attribute - array of the attribute names to use for comparisons

ascendingFlags - array of boolean values specifying ascending or descending order to use for each attribute name. If true, the attributes are sorted in ascending order.

Method Detail

getLocale

public java.util.Locale getLocale()

Gets the locale, if any, used for collation. If the locale is null, an ordinary string comparison is used for sorting.

Returns:

the locale used for collation, or null.

setLocale

public void setLocale(java.util.Locale locale)

Set the locale, if any, used for collation. If the locale is null, an ordinary string comparison is used for sorting.

Parameters:

locale - the locale used for collation, or null.

isGreater

public boolean isGreater(LDAPEntry greater,
                         LDAPEntry less)

Returns true if the value of the attribute in the first entry is greater than the value of the attribute in the second entry.

If one of the entries is missing the attribute, the other is considered greater. By default, the first entry is greater.

If either entry contains multiple values, only the first value is used for comparisons.

Specified by:

isGreater in interface LDAPEntryComparator

Parameters:

greater - entry against which to test

less - entry to test

Returns:

true if (greater > less).