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## javax.swing.text
Interface AttributeSet

All Known Subinterfaces:
  MutableAttributeSet, Style

All Known Implementing Classes:
  AbstractDocument.AbstractElement, SimpleAttributeSet, StyleContext.NamedStyle, StyleContext.SmallAttributeSet

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
`static interface` | `AttributeSet.CharacterAttribute` This interface is the type signature that is expected to be present on any attribute key that contributes to character level presentation.
`static interface` | `AttributeSet.ColorAttribute` This interface is the type signature that is expected to be present on any attribute key that contributes to presentation of color.
`static interface` | `AttributeSet.FontAttribute` This interface is the type signature that is expected to be present on any attribute key that contributes to the determination of what font to use to render some text.
`static interface` | `AttributeSet.ParagraphAttribute` This interface is the type signature that is expected to be present on any attribute key that contributes to the paragraph level presentation.

Field Summary
`static Object` | `NameAttribute` Attribute name used to name the collection of attributes.
`static Object` | `ResolveAttribute` Attribute name used to identify the resolving parent set of attributes, if one is defined.

Method Summary
`boolean` | `containsAttribute(Object name, Object value)` Returns true if this set contains this attribute with an equal value.
`boolean` | `containsAttributes(AttributeSet attributes)` Returns true if this set contains all the attributes with equal values.
`AttributeSet` | `copyAttributes()` Returns an attribute set that is guaranteed not to change over time.
`Object` | `getAttribute(Object key)` Fetches the value of the given attribute.
`int` | `getAttributeCount()` Returns the number of attributes contained in this set.
`Enumeration` | `getAttributeNames()` Returns an enumeration over the names of the attributes in the set.
`AttributeSet` | `getResolveParent()` Gets the resolving parent.
`boolean` | `isDefined(Object attrName)` Checks whether the named attribute has a value specified in the set without resolving through another attribute set.
`boolean` | `isEqual(AttributeSet attr)` Determines if the two attribute sets are equivalent.

Field Detail

### NameAttribute

    public static final Object NameAttribute

  Attribute name used to name the collection of attributes.

### ResolveAttribute

    public static final Object ResolveAttribute

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

Method Detail

### getAttributeCount

    public int getAttributeCount()

  Returns the number of attributes contained in this set.

  Returns:
    the number of attributes >= 0

### isDefined

    public 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

    public boolean isEqual(AttributeSet attr)

  Determines if the two attribute sets are equivalent.

  Parameters:
    `attr` - an attribute set
  Returns:
    true if the sets are equivalent

### copyAttributes

    public AttributeSet copyAttributes()

  Returns an attribute set that is guaranteed not to change over time.

  Returns:
    a copy of the attribute set

### getAttribute

    public Object getAttribute(Object key)

  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

### getAttributeNames

    public Enumeration getAttributeNames()

  Returns an enumeration over the names of the attributes in the set. The values of the `Enumeration` may be anything and are not constrained to a particular `Object` type. The set does not include the resolving parent, if one is defined.

  Returns:
    the names

### containsAttribute

    public boolean containsAttribute(Object name,
                                     Object value)

  Returns true if this set contains this attribute with an equal value.

  Parameters:
    `name` - the non-null attribute name
    `value` - the value
  Returns:
    true if the set contains the attribute with an equal value

### containsAttributes

    public boolean containsAttributes(AttributeSet attributes)

  Returns true if this set contains all the attributes with equal values.

  Parameters:
    `attributes` - the set of attributes to check against
  Returns:
    true if this set contains all the attributes with equal values

### getResolveParent

    public AttributeSet getResolveParent()

  Gets the resolving parent.

  Returns:
    the parent

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For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

Copyright 2003 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.