/*
* @(#)AttributeSet.java 1.40 04/05/05
*
* Copyright 2004 Sun Microsystems, Inc. All rights reserved.
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/
package javax.swing.text;
import java.util.Enumeration;
/**
* 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.
* <p>
* 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.
*
* @author Timothy Prinzing
* @version 1.40 05/05/04
* @see MutableAttributeSet
*/
public interface AttributeSet {
/**
* 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. This is not considered to be a closed set, the
* definition can change across version of the platform and can
* be amended by additional user added entries that
* correspond to logical settings that are specific to
* some type of content.
*/
public interface FontAttribute {
}
/**
* This interface is the type signature that is expected
* to be present on any attribute key that contributes to
* presentation of color.
*/
public interface ColorAttribute {
}
/**
* This interface is the type signature that is expected
* to be present on any attribute key that contributes to
* character level presentation. This would be any attribute
* that applies to a so-called <term>run</term> of
* style.
*/
public interface CharacterAttribute {
}
/**
* This interface is the type signature that is expected
* to be present on any attribute key that contributes to
* the paragraph level presentation.
*/
public interface ParagraphAttribute {
}
/**
* Returns the number of attributes contained in this set.
*
* @return the number of attributes >= 0
*/
public int getAttributeCount();
/**
* Checks whether the named attribute has a value specified in
* the set without resolving through another attribute
* set.
*
* @param attrName the attribute name
* @return true if the attribute has a value specified
*/
public boolean isDefined(Object attrName);
/**
* Determines if the two attribute sets are equivalent.
*
* @param attr an attribute set
* @return true if the sets are equivalent
*/
public boolean isEqual(AttributeSet attr);
/**
* Returns an attribute set that is guaranteed not
* to change over time.
*
* @return a copy of the attribute set
*/
public AttributeSet copyAttributes();
/**
* 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.
*
* @param key the non-null key of the attribute binding
* @return the value
*/
public Object getAttribute(Object key);
/**
* Returns an enumeration over the names of the attributes in the set.
* The values of the <code>Enumeration</code> may be anything
* and are not constrained to a particular <code>Object</code> type.
* The set does not include the resolving parent, if one is defined.
*
* @return the names
*/
public Enumeration<?> getAttributeNames();
/**
* Returns true if this set contains this attribute with an equal value.
*
* @param name the non-null attribute name
* @param value the value
* @return true if the set contains the attribute with an equal value
*/
public boolean containsAttribute(Object name, Object value);
/**
* Returns true if this set contains all the attributes with equal values.
*
* @param attributes the set of attributes to check against
* @return true if this set contains all the attributes with equal values
*/
public boolean containsAttributes(AttributeSet attributes);
/**
* Gets the resolving parent.
*
* @return the parent
*/
public AttributeSet getResolveParent();
/**
* Attribute name used to name the collection of
* attributes.
*/
public static final Object NameAttribute = StyleConstants.NameAttribute;
/**
* Attribute name used to identify the resolving parent
* set of attributes, if one is defined.
*/
public static final Object ResolveAttribute = StyleConstants.ResolveAttribute;
}
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