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341 lines
14 KiB
341 lines
14 KiB
/*
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* Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*
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*
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*/
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package javax.naming.directory;
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import java.util.Vector;
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import java.util.Enumeration;
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import java.util.NoSuchElementException;
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import javax.naming.NamingException;
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import javax.naming.NamingEnumeration;
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import javax.naming.OperationNotSupportedException;
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/**
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* This interface represents an attribute associated with a named object.
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*<p>
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* In a directory, named objects can have associated with them
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* attributes. The <tt>Attribute</tt> interface represents an attribute associated
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* with a named object. An attribute contains 0 or more, possibly null, values.
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* The attribute values can be ordered or unordered (see <tt>isOrdered()</tt>).
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* If the values are unordered, no duplicates are allowed.
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* If the values are ordered, duplicates are allowed.
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*<p>
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* The content and representation of an attribute and its values is defined by
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* the attribute's <em>schema</em>. The schema contains information
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* about the attribute's syntax and other properties about the attribute.
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* See <tt>getAttributeDefinition()</tt> and
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* <tt>getAttributeSyntaxDefinition()</tt>
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* for details regarding how to get schema information about an attribute
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* if the underlying directory service supports schemas.
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*<p>
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* Equality of two attributes is determined by the implementation class.
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* A simple implementation can use <tt>Object.equals()</tt> to determine equality
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* of attribute values, while a more sophisticated implementation might
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* make use of schema information to determine equality.
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* Similarly, one implementation might provide a static storage
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* structure which simply returns the values passed to its
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* constructor, while another implementation might define <tt>get()</tt> and
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* <tt>getAll()</tt>.
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* to get the values dynamically from the directory.
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*<p>
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* Note that updates to <tt>Attribute</tt> (such as adding or removing a
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* value) do not affect the corresponding representation of the attribute
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* in the directory. Updates to the directory can only be effected
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* using operations in the <tt>DirContext</tt> interface.
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*
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* @author Rosanna Lee
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* @author Scott Seligman
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*
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* @see BasicAttribute
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* @since 1.3
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*/
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public interface Attribute extends Cloneable, java.io.Serializable {
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/**
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* Retrieves an enumeration of the attribute's values.
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* The behaviour of this enumeration is unspecified
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* if the attribute's values are added, changed,
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* or removed while the enumeration is in progress.
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* If the attribute values are ordered, the enumeration's items
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* will be ordered.
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*
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* @return A non-null enumeration of the attribute's values.
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* Each element of the enumeration is a possibly null Object. The object's
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* class is the class of the attribute value. The element is null
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* if the attribute's value is null.
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* If the attribute has zero values, an empty enumeration
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* is returned.
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* @exception NamingException
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* If a naming exception was encountered while retrieving
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* the values.
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* @see #isOrdered
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*/
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NamingEnumeration<?> getAll() throws NamingException;
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/**
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* Retrieves one of this attribute's values.
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* If the attribute has more than one value and is unordered, any one of
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* the values is returned.
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* If the attribute has more than one value and is ordered, the
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* first value is returned.
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*
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* @return A possibly null object representing one of
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* the attribute's value. It is null if the attribute's value
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* is null.
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* @exception NamingException
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* If a naming exception was encountered while retrieving
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* the value.
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* @exception java.util.NoSuchElementException
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* If this attribute has no values.
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*/
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Object get() throws NamingException;
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/**
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* Retrieves the number of values in this attribute.
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*
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* @return The nonnegative number of values in this attribute.
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*/
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int size();
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/**
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* Retrieves the id of this attribute.
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*
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* @return The id of this attribute. It cannot be null.
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*/
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String getID();
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/**
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* Determines whether a value is in the attribute.
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* Equality is determined by the implementation, which may use
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* <tt>Object.equals()</tt> or schema information to determine equality.
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*
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* @param attrVal The possibly null value to check. If null, check
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* whether the attribute has an attribute value whose value is null.
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* @return true if attrVal is one of this attribute's values; false otherwise.
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* @see java.lang.Object#equals
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* @see BasicAttribute#equals
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*/
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boolean contains(Object attrVal);
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/**
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* Adds a new value to the attribute.
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* If the attribute values are unordered and
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* <tt>attrVal</tt> is already in the attribute, this method does nothing.
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* If the attribute values are ordered, <tt>attrVal</tt> is added to the end of
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* the list of attribute values.
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*<p>
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* Equality is determined by the implementation, which may use
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* <tt>Object.equals()</tt> or schema information to determine equality.
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*
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* @param attrVal The new possibly null value to add. If null, null
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* is added as an attribute value.
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* @return true if a value was added; false otherwise.
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*/
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boolean add(Object attrVal);
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/**
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* Removes a specified value from the attribute.
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* If <tt>attrval</tt> is not in the attribute, this method does nothing.
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* If the attribute values are ordered, the first occurrence of
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* <tt>attrVal</tt> is removed and attribute values at indices greater
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* than the removed
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* value are shifted up towards the head of the list (and their indices
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* decremented by one).
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*<p>
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* Equality is determined by the implementation, which may use
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* <tt>Object.equals()</tt> or schema information to determine equality.
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*
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* @param attrval The possibly null value to remove from this attribute.
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* If null, remove the attribute value that is null.
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* @return true if the value was removed; false otherwise.
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*/
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boolean remove(Object attrval);
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/**
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* Removes all values from this attribute.
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*/
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void clear();
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/**
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* Retrieves the syntax definition associated with the attribute.
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* An attribute's syntax definition specifies the format
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* of the attribute's value(s). Note that this is different from
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* the attribute value's representation as a Java object. Syntax
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* definition refers to the directory's notion of <em>syntax</em>.
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*<p>
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* For example, even though a value might be
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* a Java String object, its directory syntax might be "Printable String"
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* or "Telephone Number". Or a value might be a byte array, and its
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* directory syntax is "JPEG" or "Certificate".
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* For example, if this attribute's syntax is "JPEG",
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* this method would return the syntax definition for "JPEG".
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* <p>
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* The information that you can retrieve from a syntax definition
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* is directory-dependent.
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*<p>
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* If an implementation does not support schemas, it should throw
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* OperationNotSupportedException. If an implementation does support
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* schemas, it should define this method to return the appropriate
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* information.
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* @return The attribute's syntax definition. Null if the implementation
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* supports schemas but this particular attribute does not have
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* any schema information.
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* @exception OperationNotSupportedException If getting the schema
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* is not supported.
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* @exception NamingException If a naming exception occurs while getting
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* the schema.
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*/
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DirContext getAttributeSyntaxDefinition() throws NamingException;
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/**
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* Retrieves the attribute's schema definition.
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* An attribute's schema definition contains information
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* such as whether the attribute is multivalued or single-valued,
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* the matching rules to use when comparing the attribute's values.
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*
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* The information that you can retrieve from an attribute definition
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* is directory-dependent.
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*
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*<p>
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* If an implementation does not support schemas, it should throw
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* OperationNotSupportedException. If an implementation does support
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* schemas, it should define this method to return the appropriate
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* information.
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* @return This attribute's schema definition. Null if the implementation
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* supports schemas but this particular attribute does not have
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* any schema information.
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* @exception OperationNotSupportedException If getting the schema
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* is not supported.
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* @exception NamingException If a naming exception occurs while getting
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* the schema.
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*/
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DirContext getAttributeDefinition() throws NamingException;
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/**
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* Makes a copy of the attribute.
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* The copy contains the same attribute values as the original attribute:
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* the attribute values are not themselves cloned.
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* Changes to the copy will not affect the original and vice versa.
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*
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* @return A non-null copy of the attribute.
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*/
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Object clone();
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//----------- Methods to support ordered multivalued attributes
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/**
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* Determines whether this attribute's values are ordered.
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* If an attribute's values are ordered, duplicate values are allowed.
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* If an attribute's values are unordered, they are presented
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* in any order and there are no duplicate values.
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* @return true if this attribute's values are ordered; false otherwise.
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* @see #get(int)
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* @see #remove(int)
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* @see #add(int, java.lang.Object)
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* @see #set(int, java.lang.Object)
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*/
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boolean isOrdered();
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/**
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* Retrieves the attribute value from the ordered list of attribute values.
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* This method returns the value at the <tt>ix</tt> index of the list of
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* attribute values.
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* If the attribute values are unordered,
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* this method returns the value that happens to be at that index.
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* @param ix The index of the value in the ordered list of attribute values.
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* {@code 0 <= ix < size()}.
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* @return The possibly null attribute value at index <tt>ix</tt>;
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* null if the attribute value is null.
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* @exception NamingException If a naming exception was encountered while
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* retrieving the value.
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* @exception IndexOutOfBoundsException If <tt>ix</tt> is outside the specified range.
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*/
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Object get(int ix) throws NamingException;
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/**
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* Removes an attribute value from the ordered list of attribute values.
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* This method removes the value at the <tt>ix</tt> index of the list of
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* attribute values.
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* If the attribute values are unordered,
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* this method removes the value that happens to be at that index.
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* Values located at indices greater than <tt>ix</tt> are shifted up towards
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* the front of the list (and their indices decremented by one).
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*
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* @param ix The index of the value to remove.
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* {@code 0 <= ix < size()}.
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* @return The possibly null attribute value at index <tt>ix</tt> that was removed;
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* null if the attribute value is null.
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* @exception IndexOutOfBoundsException If <tt>ix</tt> is outside the specified range.
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*/
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Object remove(int ix);
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/**
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* Adds an attribute value to the ordered list of attribute values.
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* This method adds <tt>attrVal</tt> to the list of attribute values at
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* index <tt>ix</tt>.
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* Values located at indices at or greater than <tt>ix</tt> are
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* shifted down towards the end of the list (and their indices incremented
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* by one).
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* If the attribute values are unordered and already have <tt>attrVal</tt>,
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* <tt>IllegalStateException</tt> is thrown.
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*
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* @param ix The index in the ordered list of attribute values to add the new value.
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* {@code 0 <= ix <= size()}.
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* @param attrVal The possibly null attribute value to add; if null, null is
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* the value added.
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* @exception IndexOutOfBoundsException If <tt>ix</tt> is outside the specified range.
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* @exception IllegalStateException If the attribute values are unordered and
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* <tt>attrVal</tt> is one of those values.
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*/
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void add(int ix, Object attrVal);
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/**
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* Sets an attribute value in the ordered list of attribute values.
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* This method sets the value at the <tt>ix</tt> index of the list of
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* attribute values to be <tt>attrVal</tt>. The old value is removed.
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* If the attribute values are unordered,
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* this method sets the value that happens to be at that index
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* to <tt>attrVal</tt>, unless <tt>attrVal</tt> is already one of the values.
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* In that case, <tt>IllegalStateException</tt> is thrown.
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*
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* @param ix The index of the value in the ordered list of attribute values.
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* {@code 0 <= ix < size()}.
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* @param attrVal The possibly null attribute value to use.
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* If null, 'null' replaces the old value.
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* @return The possibly null attribute value at index ix that was replaced.
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* Null if the attribute value was null.
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* @exception IndexOutOfBoundsException If <tt>ix</tt> is outside the specified range.
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* @exception IllegalStateException If <tt>attrVal</tt> already exists and the
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* attribute values are unordered.
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*/
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Object set(int ix, Object attrVal);
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/**
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* Use serialVersionUID from JNDI 1.1.1 for interoperability.
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*/
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static final long serialVersionUID = 8707690322213556804L;
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}
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