AttributeSet (Java SE 15 & JDK 15) (original) (raw)

All Known Subinterfaces:

[MutableAttributeSet](MutableAttributeSet.html "interface in javax.swing.text"), [Style](Style.html "interface in javax.swing.text")

All Known Implementing Classes:

[AbstractDocument.AbstractElement](AbstractDocument.AbstractElement.html "class in javax.swing.text"), [AbstractDocument.BranchElement](AbstractDocument.BranchElement.html "class in javax.swing.text"), [AbstractDocument.LeafElement](AbstractDocument.LeafElement.html "class in javax.swing.text"), [DefaultStyledDocument.SectionElement](DefaultStyledDocument.SectionElement.html "class in javax.swing.text"), [HTMLDocument.BlockElement](html/HTMLDocument.BlockElement.html "class in javax.swing.text.html"), [HTMLDocument.RunElement](html/HTMLDocument.RunElement.html "class in javax.swing.text.html"), [SimpleAttributeSet](SimpleAttributeSet.html "class in javax.swing.text"), [StyleContext.NamedStyle](StyleContext.NamedStyle.html "class in javax.swing.text"), [StyleContext.SmallAttributeSet](StyleContext.SmallAttributeSet.html "class in javax.swing.text")

public interface AttributeSet

A collection of unique attributes. This is a read-only, immutable interface. An attribute is basically a key and a value assigned to the key. The collection may represent something like a style run, a logical style, etc. These are generally used to describe features that will contribute to some graphical representation such as a font. The set of possible keys is unbounded and can be anything. Typically View implementations will respond to attribute definitions and render something to represent the attributes.

Attributes can potentially resolve in a hierarchy. If a key doesn't resolve locally, and a resolving parent exists, the key will be resolved through the parent.

See Also:

MutableAttributeSet

• Nested Class Summary

Nested Classes

• Field Summary

Fields

• Method Summary

• Field Details

  • NameAttribute

  static final Object NameAttribute
  Attribute name used to name the collection of attributes.

  • ResolveAttribute

  static final Object ResolveAttribute
  Attribute name used to identify the resolving parent set of attributes, if one is defined.

• Method Details

  • getAttributeCount

  int getAttributeCount()
  Returns the number of attributes that are defined locally in this set. Attributes that are defined in the parent set are not included.
  Returns:
  the number of attributes >= 0

  • isDefined

  boolean isDefined​(Object attrName)
  Checks whether the named attribute has a value specified in the set without resolving through another attribute set.
  Parameters:
  attrName - the attribute name
  Returns:
  true if the attribute has a value specified

  • isEqual

  Determines if the two attribute sets are equivalent.
  Parameters:
  attr - an attribute set
  Returns:
  true if the sets are equivalent

  • copyAttributes

  Returns an attribute set that is guaranteed not to change over time.
  Returns:
  a copy of the attribute set

  • getAttribute

  Fetches the value of the given attribute. If the value is not found locally, the search is continued upward through the resolving parent (if one exists) until the value is either found or there are no more parents. If the value is not found, null is returned.
  Parameters:
  key - the non-null key of the attribute binding
  Returns:
  the value of the attribute, or null if not found

  • getAttributeNames

  Returns an enumeration over the names of the attributes that are defined locally in the set. Names of attributes defined in the resolving parent, if any, are not included. The values of theEnumeration may be anything and are not constrained to a particular Object type.
  This method never returns null. For a set with no attributes, it returns an empty Enumeration.
  Returns:
  the names

  • containsAttribute

  boolean containsAttribute​(Object name,Object value)
  Returns true if this set defines an attribute with the same name and an equal value. If such an attribute is not found locally, it is searched through in the resolving parent hierarchy.
  Parameters:
  name - the non-null attribute name
  value - the value
  Returns:
  true if the set defines the attribute with an equal value, either locally or through its resolving parent
  Throws:
  [NullPointerException](../../../../java.base/java/lang/NullPointerException.html "class in java.lang") - if either name orvalue is null

  • containsAttributes

  boolean containsAttributes​(AttributeSet attributes)
  Returns true if this set defines all the attributes from the given set with equal values. If an attribute is not found locally, it is searched through in the resolving parent hierarchy.
  Parameters:
  attributes - the set of attributes to check against
  Returns:
  true if this set defines all the attributes with equal values, either locally or through its resolving parent
  Throws:
  [NullPointerException](../../../../java.base/java/lang/NullPointerException.html "class in java.lang") - if attributes is null

  • getResolveParent

  Gets the resolving parent.
  Returns:
  the parent