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- All Known Subinterfaces:
- MutableAttributeSet, Style
- All Known Implementing Classes:
- AbstractDocument.AbstractElement, AbstractDocument.BranchElement, AbstractDocument.LeafElement, DefaultStyledDocument.SectionElement, HTMLDocument.BlockElement, HTMLDocument.RunElement, SimpleAttributeSet, StyleContext.NamedStyle, StyleContext.SmallAttributeSet
public interface AttributeSetA 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
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Nested Class Summary
Nested Classes Modifier and Type Interface and Description static interfaceAttributeSet.CharacterAttributeThis interface is the type signature that is expected to be present on any attribute key that contributes to character level presentation.static interfaceAttributeSet.ColorAttributeThis interface is the type signature that is expected to be present on any attribute key that contributes to presentation of color.static interfaceAttributeSet.FontAttributeThis 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 interfaceAttributeSet.ParagraphAttributeThis interface is the type signature that is expected to be present on any attribute key that contributes to the paragraph level presentation.
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Field Summary
Fields Modifier and Type Field and Description static ObjectNameAttributeAttribute name used to name the collection of attributes.static ObjectResolveAttributeAttribute name used to identify the resolving parent set of attributes, if one is defined.
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Method Summary
Methods Modifier and Type Method and Description booleancontainsAttribute(Object name, Object value)Returnstrueif this set defines an attribute with the same name and an equal value.booleancontainsAttributes(AttributeSet attributes)Returnstrueif this set defines all the attributes from the given set with equal values.AttributeSetcopyAttributes()Returns an attribute set that is guaranteed not to change over time.ObjectgetAttribute(Object key)Fetches the value of the given attribute.intgetAttributeCount()Returns the number of attributes that are defined locally in this set.Enumeration<?>getAttributeNames()Returns an enumeration over the names of the attributes that are defined locally in the set.AttributeSetgetResolveParent()Gets the resolving parent.booleanisDefined(Object attrName)Checks whether the named attribute has a value specified in the set without resolving through another attribute set.booleanisEqual(AttributeSet attr)Determines if the two attribute sets are equivalent.
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Field Detail
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NameAttribute
static final Object NameAttribute
Attribute name used to name the collection of attributes.
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ResolveAttribute
static final Object ResolveAttribute
Attribute name used to identify the resolving parent set of attributes, if one is defined.
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Method Detail
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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
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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
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isEqual
boolean isEqual(AttributeSet attr)
Determines if the two attribute sets are equivalent.- Parameters:
attr- an attribute set- Returns:
- true if the sets are equivalent
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copyAttributes
AttributeSet copyAttributes()
Returns an attribute set that is guaranteed not to change over time.- Returns:
- a copy of the attribute set
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getAttribute
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 of the attribute, or
nullif not found
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getAttributeNames
Enumeration<?> 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 theEnumerationmay be anything and are not constrained to a particularObjecttype.This method never returns
null. For a set with no attributes, it returns an emptyEnumeration.- Returns:
- the names
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containsAttribute
boolean containsAttribute(Object name, Object value)
Returnstrueif 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 namevalue- the value- Returns:
trueif the set defines the attribute with an equal value, either locally or through its resolving parent- Throws:
NullPointerException- if eithernameorvalueisnull
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containsAttributes
boolean containsAttributes(AttributeSet attributes)
Returnstrueif 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:
trueif this set defines all the attributes with equal values, either locally or through its resolving parent- Throws:
NullPointerException- ifattributesisnull
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getResolveParent
AttributeSet getResolveParent()
Gets the resolving parent.- Returns:
- the parent
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Nederlandse vertaling
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Bij voorbaat dank.
Document heeft de 11/06/2005 gemaakt, de laatste keer de 04/03/2020 gewijzigd
Bron van het afgedrukte document:https://www.gaudry.be/nl/java-api-rf-javax/swing/text/attributeset.html
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