Java Reference
In-Depth Information
AttributeSet Interface
The AttributeSet interface describes a read-only set of key/value attributes, allowing you
access to the descriptive content of a series of attributes. If the set of attributes lacks a specific
key defined for it, the AttributeSet supports the ability to look elsewhere by traveling up a chain
to a resolving parent for the parent's definition of the attribute. This allows the AttributeSet to
define a core set of attributes and lets developers (or possibly even users) modify only the set of
attributes they want to change. Unless you want someone to change the defaults globally, you
shouldn't provide direct access to the resolving parent. That way, you never lose any of the
original settings.
public interface AttributeSet {
// Constants
public final static Object NameAttribute;
public final static Object ResolveAttribute;
// Properties
public int getAttributeCount();
public Enumeration getAttributeNames();
public AttributeSet getResolveParent();
// Other methods
public boolean containsAttribute(Object name, Object value);
public boolean containsAttributes(AttributeSet attributes);
public AttributeSet copyAttributes();
public Object getAttribute(Object key);
public boolean isDefined(Object attrName);
public boolean isEqual(AttributeSet attr);
}
MutableAttributeSet Interface
The MutableAttributeSet interface describes how you would go about adding to or removing
from the set of attributes, as well as how to set the resolving parent.
public interface MutableAttributeSet extends AttributeSet {
public void addAttribute(Object name, Object value);
public void addAttributes(AttributeSet attributes);
public void removeAttribute(Object name);
public void removeAttributes(AttributeSet attributes);
public void removeAttributes(Enumeration names);
public void setResolveParent(AttributeSet parent);
}
SimpleAttributeSet Class
The SimpleAttributeSet class is the first implementation of the AttributeSet interface. When
you begin using it, you'll finally be able to see just how to create the multiple-attributed text
for display in the JTextPane . The SimpleAttributeSet class is a specific implementation of
AttributeSet that relies on a standard Hashtable for managing the key/attribute pairs.
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