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## nu.xom
Class Attribute

    Object
      nu.xom.Node
          nu.xom.Attribute

public class Attribute
extends Node

This class represents an attribute such as `type="empty"` or `xlink:href="http://www.example.com"`.

Attributes that declare namespaces such as `xmlns="http://www.w3.org/TR/1999/xhtml"` or `xmlns:xlink="http://www.w3.org/TR/1999/xlink"` are stored separately on the elements where they appear. They are never represented as `Attribute` objects.

Version:
  1.0
Author:
  Elliotte Rusty Harold

Nested Class Summary
`static class` | `Attribute.Type` Uses the type-safe enumeration design pattern to represent attribute types, as specified by XML DTDs.

Constructor Summary
`Attribute(Attribute attribute)` Creates a copy of the specified attribute.
`Attribute(String localName, String value)` Creates a new attribute in no namespace with the specified name and value and undeclared type.
`Attribute(String localName, String value, Attribute.Type type)` Creates a new attribute in no namespace with the specified name, value, and type.
`Attribute(String name, String URI, String value)` Creates a new attribute in the specified namespace with the specified name and value and undeclared type.
`Attribute(String name, String URI, String value, Attribute.Type type)` Creates a new attribute in the specified namespace with the specified name, value, and type.

Method Summary
`Node` | `copy()` Creates a deep copy of this attribute that is not attached to an element.
`Node` | `getChild(int position)` Throws `IndexOutOfBoundsException` because attributes do not have children.
`int` | `getChildCount()` Returns 0 because attributes do not have children.
`String` | `getLocalName()` Returns the local name of this attribute, not including the prefix.
`String` | `getNamespacePrefix()` Returns the prefix of this attribute, or the empty string if this attribute is not in a namespace.
`String` | `getNamespaceURI()` Returns the namespace URI of this attribute, or the empty string if this attribute is not in a namespace.
`String` | `getQualifiedName()` Returns the qualified name of this attribute, including the prefix if this attribute is in a namespace.
`Attribute.Type` | `getType()` Returns the DTD type of this attribute.
`String` | `getValue()` Returns the attribute value.
`void` | `setLocalName(String localName)` Sets the local name of the attribute.
`void` | `setNamespace(String prefix, String URI)` Sets the attribute's namespace prefix and URI.
`void` | `setType(Attribute.Type type)` Sets the type of this attribute to one of the ten DTD types or `Type.UNDECLARED`.
`void` | `setValue(String value)` Sets the attribute's value to the specified string, replacing any previous value.
`String` | `toString()` Returns a string representation of the attribute suitable for debugging and diagnosis.
`String` | `toXML()` Returns a string representation of the attribute that is a well-formed XML attribute.

Methods inherited from class nu.xom.Node
`detach, equals, getBaseURI, getDocument, getParent, hashCode`

Methods inherited from class Object
`clone, finalize, getClass, notify, notifyAll, wait, wait, wait`

Constructor Detail

### Attribute

    public Attribute(String localName,
                     String value)

  Creates a new attribute in no namespace with the specified name and value and undeclared type.

Parameters:
  `localName` - the unprefixed attribute name
  `value` - the attribute value
Throws:
  `IllegalNameException` - if the local name is not a namespace well-formed, non-colonized name
  `IllegalDataException` - if the value contains characters which are not legal in XML such as vertical tab or a null. Characters such as " and & are legal, but will be automatically escaped when the attribute is serialized.

### Attribute

    public Attribute(String localName,
                     String value,
                     Attribute.Type type)

  Creates a new attribute in no namespace with the specified name, value, and type.

Parameters:
  `localName` - the unprefixed attribute name
  `value` - the attribute value
  `type` - the attribute type
Throws:
  `IllegalNameException` - if the local name is not a namespace well-formed non-colonized name
  `IllegalDataException` - if the value contains characters which are not legal in XML such as vertical tab or a null. Note that characters such as " and & are legal, but will be automatically escaped when the attribute is serialized.

### Attribute

    public Attribute(String name,
                     String URI,
                     String value)

  Creates a new attribute in the specified namespace with the specified name and value and undeclared type.

Parameters:
  `name` - the prefixed attribute name
  `URI` - the namespace URI
  `value` - the attribute value
Throws:
  `IllegalNameException` - if the name is not a namespace well-formed prefixed name
  `IllegalDataException` - if the value contains characters which are not legal in XML such as vertical tab or a null. Note that characters such as " and & are legal, but will be automatically escaped when the attribute is serialized.
  `MalformedURIException` - if `URI` is not an RFC2396 URI reference

### Attribute

    public Attribute(String name,
                     String URI,
                     String value,
                     Attribute.Type type)

  Creates a new attribute in the specified namespace with the specified name, value, and type.

Parameters:
  `name` - the prefixed attribute name
  `URI` - the namespace URI
  `value` - the attribute value
  `type` - the attribute type
Throws:
  `IllegalNameException` - if the name is not a namespace well-formed prefixed name
  `IllegalDataException` - if the value contains characters which are not legal in XML such as vertical tab or a null. Note that characters such as " and & are legal, but will be automatically escaped when the attribute is serialized.
  `MalformedURIException` - if `URI` is not an RFC2396 absolute URI reference

### Attribute

    public Attribute(Attribute attribute)

  Creates a copy of the specified attribute.

Parameters:
  `attribute` - the attribute to copy

Method Detail

### getType

    public final Attribute.Type getType()

  Returns the DTD type of this attribute. If this attribute does not have a type, then `Type.UNDECLARED` is returned.

  Returns:
    the DTD type of this attribute

### setType

    public void setType(Attribute.Type type)

  Sets the type of this attribute to one of the ten DTD types or `Type.UNDECLARED`.

  Parameters:
    `type` - the DTD type of this attribute

### getValue

    public final String getValue()

  Returns the attribute value. If the attribute was originally created by a parser, it will have been normalized according to its type. However, attributes created in memory are not normalized.

  Specified by:
    `getValue` in class `Node`
  Returns:
    the value of the attribute

### setValue

    public void setValue(String value)

  Sets the attribute's value to the specified string, replacing any previous value. The value is not normalized automatically.

  Parameters:
    `value` - the value assigned to the attribute
  Throws:
    `IllegalDataException` - if the value contains characters which are not legal in XML such as vertical tab or a null. Characters such as " and & are legal, but will be automatically escaped when the attribute is serialized.
    `MalformedURIException` - if this is an `xml:base` attribute, and the value is not a legal IRI

### getLocalName

    public final String getLocalName()

  Returns the local name of this attribute, not including the prefix.

  Returns:
    the attribute's local name

### setLocalName

    public void setLocalName(String localName)

  Sets the local name of the attribute.

  Parameters:
    `localName` - the new local name
  Throws:
    `IllegalNameException` - if `localName` is not a namespace well-formed, non-colonized name

### getQualifiedName

    public final String getQualifiedName()

  Returns the qualified name of this attribute, including the prefix if this attribute is in a namespace.

  Returns:
    the attribute's qualified name

### getNamespaceURI

    public final String getNamespaceURI()

  Returns the namespace URI of this attribute, or the empty string if this attribute is not in a namespace.

  Returns:
    the attribute's namespace URI

### getNamespacePrefix

    public final String getNamespacePrefix()

  Returns the prefix of this attribute, or the empty string if this attribute is not in a namespace.

  Returns:
    the attribute's prefix

### setNamespace

    public void setNamespace(String prefix,
                             String URI)

  Sets the attribute's namespace prefix and URI. Because attributes must be prefixed in order to have a namespace URI (and vice versa) this must be done simultaneously.

  Parameters:
    `prefix` - the new namespace prefix
    `URI` - the new namespace URI
  Throws:
    `MalformedURIException` - if `URI` is not an RFC2396 URI reference
    `IllegalNameException` - if
    - The prefix is `xmlns`
    - The prefix is null or the empty string.
    - The URI is null or the empty string.
    `NamespaceConflictException` - if
    - The prefix is `xml` and the namespace URI is not `http://www.w3.org/XML/1998/namespace`
    - The prefix conflicts with an existing declaration on the attribute's parent element.

### getChild

    public final Node getChild(int position)

  Throws `IndexOutOfBoundsException` because attributes do not have children.

  Specified by:
    `getChild` in class `Node`
  Parameters:
    `position` - the child to return
  Returns:
    nothing. This method always throws an exception.
  Throws:
    `IndexOutOfBoundsException` - because attributes do not have children

### getChildCount

    public final int getChildCount()

  Returns 0 because attributes do not have children.

  Specified by:
    `getChildCount` in class `Node`
  Returns:
    zero

### copy

    public Node copy()

  Creates a deep copy of this attribute that is not attached to an element.

  Specified by:
    `copy` in class `Node`
  Returns:
    a copy of this attribute

### toXML

    public final String toXML()

  Returns a string representation of the attribute that is a well-formed XML attribute.

  Specified by:
    `toXML` in class `Node`
  Returns:
    a string containing the XML form of this attribute

### toString

    public final String toString()

  Returns a string representation of the attribute suitable for debugging and diagnosis. However, this is not necessarily a well-formed XML attribute.

  Returns:
    a non-XML string representation of this attribute
  See Also:
    `Object.toString()`

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Copyright 2002-2005 Elliotte Rusty Harold
elharo@metalab.unc.edu