public class BasicAttribute extends Object implements Attribute
This implementation does not support the schema methods getAttributeDefinition() and getAttributeSyntaxDefinition(). They simply throw OperationNotSupportedException. Subclasses of BasicAttribute should override these methods if they support them.
The BasicAttribute class by default uses Object.equals() to determine equality of attribute values when testing for equality or when searching for values, except when the value is an array. For an array, each element of the array is checked using Object.equals(). Subclasses of BasicAttribute can make use of schema information when doing similar equality checks by overriding methods in which such use of schema is meaningful. Similarly, the BasicAttribute class by default returns the values passed to its constructor and/or manipulated using the add/remove methods. Subclasses of BasicAttribute can override get() and getAll() to get the values dynamically from the directory (or implement the Attribute interface directly instead of subclassing BasicAttribute).
Note that updates to BasicAttribute (such as adding or removing a value) does not affect the corresponding representation of the attribute in the directory. Updates to the directory can only be effected using operations in the DirContext interface.
A BasicAttribute instance is not synchronized against concurrent multithreaded access. Multiple threads trying to access and modify a BasicAttribute should lock the object.
| Modifier and Type | Field and Description |
|---|---|
protected String |
attrID
Holds the attribute's id.
|
protected boolean |
ordered
A flag for recording whether this attribute's values are ordered.
|
protected Vector<Object> |
values
Holds the attribute's values.
|
| Constructor and Description |
|---|
BasicAttribute(String id)
Constructs a new instance of an unordered attribute with no value.
|
BasicAttribute(String id,
boolean ordered)
Constructs a new instance of a possibly ordered attribute with no value.
|
BasicAttribute(String id,
Object value)
Constructs a new instance of an unordered attribute with a single value.
|
BasicAttribute(String id,
Object value,
boolean ordered)
Constructs a new instance of a possibly ordered attribute with a
single value.
|
| Modifier and Type | Method and Description |
|---|---|
void |
add(int ix,
Object attrVal)
Adds an attribute value to the ordered list of attribute values.
|
boolean |
add(Object attrVal)
Adds a new value to this attribute.
|
void |
clear()
Removes all values from this attribute.
|
Object |
clone()
Creates and returns a copy of this object.
|
boolean |
contains(Object attrVal)
Determines whether a value is in this attribute.
|
boolean |
equals(Object obj)
Determines whether obj is equal to this attribute.
|
Object |
get()
Retrieves one of this attribute's values.
|
Object |
get(int ix)
Retrieves the attribute value from the ordered list of attribute values.
|
NamingEnumeration<?> |
getAll()
Retrieves an enumeration of this attribute's values.
|
DirContext |
getAttributeDefinition()
Retrieves this attribute's schema definition.
|
DirContext |
getAttributeSyntaxDefinition()
Retrieves the syntax definition associated with this attribute.
|
String |
getID()
Retrieves the id of this attribute.
|
int |
hashCode()
Calculates the hash code of this attribute.
|
boolean |
isOrdered()
Determines whether this attribute's values are ordered.
|
Object |
remove(int ix)
Removes an attribute value from the ordered list of attribute values.
|
boolean |
remove(Object attrval)
Removes a specified value from this attribute.
|
Object |
set(int ix,
Object attrVal)
Sets an attribute value in the ordered list of attribute values.
|
int |
size()
Retrieves the number of values in this attribute.
|
String |
toString()
Generates the string representation of this attribute.
|
protected String attrID
protected transient Vector<Object> values
protected boolean ordered
public BasicAttribute(String id)
id - The attribute's id. It cannot be null.public BasicAttribute(String id, Object value)
id - The attribute's id. It cannot be null.value - The attribute's value. If null, a null
value is added to the attribute.public BasicAttribute(String id, boolean ordered)
id - The attribute's id. It cannot be null.ordered - true means the attribute's values will be ordered;
false otherwise.public BasicAttribute(String id, Object value, boolean ordered)
id - The attribute's id. It cannot be null.value - The attribute's value. If null, a null
value is added to the attribute.ordered - true means the attribute's values will be ordered;
false otherwise.public Object clone()
Objectx, the expression:
will be true, and that the expression:x.clone() != x
will bex.clone().getClass() == x.getClass()
true, but these are not absolute requirements.
While it is typically the case that:
will bex.clone().equals(x)
true, this is not an absolute requirement.
By convention, the returned object should be obtained by calling
super.clone. If a class and all of its superclasses (except
Object) obey this convention, it will be the case that
x.clone().getClass() == x.getClass().
By convention, the object returned by this method should be independent
of this object (which is being cloned). To achieve this independence,
it may be necessary to modify one or more fields of the object returned
by super.clone before returning it. Typically, this means
copying any mutable objects that comprise the internal "deep structure"
of the object being cloned and replacing the references to these
objects with references to the copies. If a class contains only
primitive fields or references to immutable objects, then it is usually
the case that no fields in the object returned by super.clone
need to be modified.
The method clone for class Object performs a
specific cloning operation. First, if the class of this object does
not implement the interface Cloneable, then a
CloneNotSupportedException is thrown. Note that all arrays
are considered to implement the interface Cloneable and that
the return type of the clone method of an array type T[]
is T[] where T is any reference or primitive type.
Otherwise, this method creates a new instance of the class of this
object and initializes all its fields with exactly the contents of
the corresponding fields of this object, as if by assignment; the
contents of the fields are not themselves cloned. Thus, this method
performs a "shallow copy" of this object, not a "deep copy" operation.
The class Object does not itself implement the interface
Cloneable, so calling the clone method on an object
whose class is Object will result in throwing an
exception at run time.
public boolean equals(Object obj)
By default Object.equals() is used when comparing the attribute id and its values except when a value is an array. For an array, each element of the array is checked using Object.equals(). A subclass may override this to make use of schema syntax information and matching rules, which define what it means for two attributes to be equal. How and whether a subclass makes use of the schema information is determined by the subclass. If a subclass overrides equals(), it should also override hashCode() such that two attributes that are equal have the same hash code.
equals in class Objectobj - The possibly null object to check.hashCode(),
contains(java.lang.Object)public int hashCode()
The hash code is computed by adding the hash code of the attribute's id and that of all of its values except for values that are arrays. For an array, the hash code of each element of the array is summed. If a subclass overrides hashCode(), it should override equals() as well so that two attributes that are equal have the same hash code.
hashCode in class Objectequals(java.lang.Object)public String toString()
public NamingEnumeration<?> getAll() throws NamingException
By default, the values returned are those passed to the constructor and/or manipulated using the add/replace/remove methods. A subclass may override this to retrieve the values dynamically from the directory.
getAll in interface AttributeNamingException - If a naming exception was encountered while retrieving
the values.Attribute.isOrdered()public Object get() throws NamingException
By default, the value returned is one of those passed to the constructor and/or manipulated using the add/replace/remove methods. A subclass may override this to retrieve the value dynamically from the directory.
get in interface AttributeNamingException - If a naming exception was encountered while retrieving
the value.public int size()
Attributepublic String getID()
Attributepublic boolean contains(Object attrVal)
By default, Object.equals() is used when comparing attrVal with this attribute's values except when attrVal is an array. For an array, each element of the array is checked using Object.equals(). A subclass may use schema information to determine equality.
contains in interface AttributeattrVal - The possibly null value to check. If null, check
whether the attribute has an attribute value whose value is null.Object.equals(java.lang.Object),
equals(java.lang.Object)public boolean add(Object attrVal)
By default, Object.equals() is used when comparing attrVal with this attribute's values except when attrVal is an array. For an array, each element of the array is checked using Object.equals(). A subclass may use schema information to determine equality.
public boolean remove(Object attrval)
By default, Object.equals() is used when comparing attrVal with this attribute's values except when attrVal is an array. For an array, each element of the array is checked using Object.equals(). A subclass may use schema information to determine equality.
public void clear()
Attributepublic boolean isOrdered()
AttributeisOrdered in interface AttributeAttribute.get(int),
Attribute.remove(int),
Attribute.add(int, java.lang.Object),
Attribute.set(int, java.lang.Object)public Object get(int ix) throws NamingException
Attributeget in interface Attributeix - The index of the value in the ordered list of attribute values.
0 <= ix < size().NamingException - If a naming exception was encountered while
retrieving the value.public Object remove(int ix)
Attributepublic void add(int ix,
Object attrVal)
Attributepublic Object set(int ix, Object attrVal)
Attributeset in interface Attributeix - The index of the value in the ordered list of attribute values.
0 <= ix < size().attrVal - The possibly null attribute value to use.
If null, 'null' replaces the old value.public DirContext getAttributeSyntaxDefinition() throws NamingException
This method by default throws OperationNotSupportedException. A subclass should override this method if it supports schema.
getAttributeSyntaxDefinition in interface AttributeOperationNotSupportedException - If getting the schema
is not supported.NamingException - If a naming exception occurs while getting
the schema.public DirContext getAttributeDefinition() throws NamingException
This method by default throws OperationNotSupportedException. A subclass should override this method if it supports schema.
getAttributeDefinition in interface AttributeOperationNotSupportedException - If getting the schema
is not supported.NamingException - If a naming exception occurs while getting
the schema. Submit a bug or feature
For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
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