CharacterIterator interface
* in order to support iteration over character attributes as well as
* over the characters themselves.
*
* In addition to attributes of specific characters, this interface
* supports the concept of the "attribute run", which is an attribute
* that is defined for a particular value across an entire range of
* characters or which is undefined over a range of characters.
*
* @author Aaron M. Renn (arenn@urbanophile.com)
*/
public interface AttributedCharacterIterator extends CharacterIterator
{
/**
* Defines attribute keys that are used as text attributes.
*/
public static class Attribute implements Serializable
{
private static final long serialVersionUID = -9142742483513960612L;
/**
* This is the attribute for the language of the text. The value of
* attributes of this key type are instances of Locale.
*/
public static final Attribute LANGUAGE = new Attribute ("LANGUAGE");
/**
* This is the attribute for the reading form of text. This is used
* for storing pronunciation along with the written text for languages
* which need it. The value of attributes of this key type are
* instances of Annotation which wrappers a
* String.
*/
public static final Attribute READING = new Attribute ("READING");
/**
* This is the attribute for input method segments. The value of attributes
* of this key type are instances of Annotation which wrapper
* a String.
*/
public static final Attribute INPUT_METHOD_SEGMENT =
new Attribute ("INPUT_METHOD_SEGMENT");
/**
* The name of the attribute key
* @serial
*/
private String name;
/**
* Initializes a new instance of this class with the specified name.
*
* @param name The name of this attribute key.
*/
protected Attribute (String name)
{
this.name = name;
}
/**
* Returns the name of this attribute.
*
* @return The attribute name
*/
protected String getName()
{
return name;
}
/**
* Resolves an instance of
* AttributedCharacterIterator.Attribute
* that is being deserialized to one of the three pre-defined attribute
* constants. It does this by comparing the names of the attributes. The
* constant that the deserialized object resolves to is returned.
*
* @return The resolved contant value
*
* @exception InvalidObjectException If the object being deserialized
* cannot be resolved.
*/
protected Object readResolve() throws InvalidObjectException
{
if (this.equals (READING))
return READING;
if (this.equals (LANGUAGE))
return LANGUAGE;
if (this.equals (INPUT_METHOD_SEGMENT))
return INPUT_METHOD_SEGMENT;
throw new InvalidObjectException ("Can't resolve Attribute: "
+ getName());
}
/**
* Tests this object for equality against the specified object.
* The two objects will be considered equal if and only if:
*
null.
* AttributedCharacterIterator.Attribute.
* Object to test for equality against this
* object.
*
* @return true if the specified object is equal to this one,
* false otherwise.
*/
public final boolean equals (Object obj)
{
if (obj == this)
return true;
else
return false;
}
/**
* Returns a hash value for this object.
*
* @return A hash value for this object.
*/
public final int hashCode()
{
return super.hashCode();
}
/**
* Returns a String representation of this object.
*
* @return A String representation of this object.
*/
public String toString()
{
return getClass().getName() + "(" + getName() + ")";
}
} // Inner class Attribute
/**
* Returns a list of all keys that are defined for the
* text range. This can be an empty list if no attributes are defined.
*
* @return A list of keys
*/
Set getAllAttributeKeys();
/**
* Returns a Map of the attributes defined for the current
* character.
*
* @return A Map of the attributes for the current character.
*/
Map getAttributes();
/**
* Returns the value of the specified attribute for the
* current character. If the attribute is not defined for the current
* character, null is returned.
*
* @param attrib The attribute to retrieve the value of.
*
* @return The value of the specified attribute
*/
Object getAttribute (AttributedCharacterIterator.Attribute attrib);
/**
* Returns the index of the first character in the run that
* contains all attributes defined for the current character.
*
* @return The start index of the run
*/
int getRunStart();
/**
* Returns the index of the first character in the run that
* contains all attributes in the specified Set defined for
* the current character.
*
* @param attribs The Set of attributes.
*
* @return The start index of the run.
*/
int getRunStart (Set attribs);
/**
* Returns the index of the first character in the run that
* contains the specified attribute defined for the current character.
*
* @param attrib The attribute.
*
* @return The start index of the run.
*/
int getRunStart (AttributedCharacterIterator.Attribute attrib);
/**
* Returns the index of the character after the end of the run
* that contains all attributes defined for the current character.
*
* @return The end index of the run.
*/
int getRunLimit();
/**
* Returns the index of the character after the end of the run
* that contains all attributes in the specified Set defined
* for the current character.
*
* @param attribs The Set of attributes.
*
* @return The end index of the run.
*/
int getRunLimit (Set attribs);
/**
* Returns the index of the character after the end of the run
* that contains the specified attribute defined for the current character.
*
* @param attrib The attribute.
*
* @return The end index of the run.
*/
int getRunLimit (AttributedCharacterIterator.Attribute attrib);
} // interface AttributedCharacterIterator