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345 lines
9.8 KiB
Java
345 lines
9.8 KiB
Java
/* AttributedCharacterIterator.java -- Iterate over attributes
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Copyright (C) 1998, 1999 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.text;
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import java.io.Serializable;
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import java.io.InvalidObjectException;
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import java.util.Set;
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import java.util.Map;
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/**
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* This interface extends the <code>CharacterIterator</code> interface
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* in order to support iteration over character attributes as well as
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* over the characters themselves.
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* <p>
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* In addition to attributes of specific characters, this interface
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* supports the concept of the "attribute run", which is an attribute
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* that is defined for a particular value across an entire range of
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* characters or which is undefined over a range of characters.
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*
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* @version 0.0
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*
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* @author Aaron M. Renn (arenn@urbanophile.com)
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*/
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public interface AttributedCharacterIterator extends CharacterIterator
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{
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/*
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* Inner Classes
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*/
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/**
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* This class defines attribute keys that are used as text attributes.
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*/
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public static class Attribute implements Serializable
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{
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/*************************************************************************/
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/*
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* Static Variables
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*/
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/**
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* This is the attribute for the language of the text. The value of
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* attributes of this key type are instances of <code>Locale</code>.
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*/
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public static final Attribute LANGUAGE = new Attribute("LANGUAGE");
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/**
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* This is the attribute for the reading form of text. This is used
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* for storing pronunciation along with the written text for languages
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* which need it. The value of attributes of this key type are
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* instances of <code>Annotation</code> which wrappers a <code>String</code>.
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*/
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public static final Attribute READING = new Attribute("READING");
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/**
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* This is the attribute for input method segments. The value of attributes
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* of this key type are instances of <code>Annotation</code> which wrapper
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* a <code>String</code>.
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*/
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public static final Attribute INPUT_METHOD_SEGMENT =
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new Attribute("INPUT_METHOD_SEGMENT");
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/*************************************************************************/
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/*
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* Instance Variables
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*/
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/**
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* This is the name of the attribute key
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* @serial
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*/
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private String name;
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/*************************************************************************/
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/*
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* Constructors
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*/
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/**
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* This method initializes a new instance of this class with the specified
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* name.
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*
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* @param name The name of this attribute key.
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*/
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protected
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Attribute(String name)
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{
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this.name = name;
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}
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/*************************************************************************/
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/*
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* Instance Methods
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*/
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/**
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* This method returns the name of this attribute.
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*
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* @return The attribute name
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*/
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protected String
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getName()
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{
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return(name);
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}
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/*************************************************************************/
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/**
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* This method resolves an instance of <code>AttributedCharacterIterator.Attribute</code>
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* that is being deserialized to one of the three pre-defined attribute
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* constants. It does this by comparing the names of the attributes. The
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* constant that the deserialized object resolves to is returned.
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*
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* @return The resolved contant value
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*
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* @exception InvalidObjectException If the object being deserialized cannot be resolved.
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*/
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protected Object
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readResolve() throws InvalidObjectException
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{
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if (this.equals(READING))
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return(READING);
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if (this.equals(LANGUAGE))
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return(LANGUAGE);
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if (this.equals(INPUT_METHOD_SEGMENT))
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return(INPUT_METHOD_SEGMENT);
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throw new InvalidObjectException("Can't resolve Attribute: " + getName());
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}
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/*************************************************************************/
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/**
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* This method tests this object for equality against the specified object.
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* The two objects will be considered equal if and only if:
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* <ul>
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* <li>The specified object is not <code>null</code>.
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* <li>The specified object is an instance of <code>AttributedCharacterIterator.Attribute</code>.
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* <li>The specified object has the same attribute name as this object.
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* </ul>
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*
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* @param The <code>Object</code> to test for equality against this object.
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*
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* @return <code>true</code> if the specified object is equal to this one, <code>false</code> otherwise.
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*/
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public final boolean
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equals(Object obj)
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{
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if (obj == this)
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return(true);
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else
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return(false);
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}
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/*************************************************************************/
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/**
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* This method returns a hash value for this object.
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*
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* @return A hash value for this object.
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*/
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public final int
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hashCode()
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{
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return(super.hashCode());
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}
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/*************************************************************************/
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/**
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* This method returns a <code>String</code> representation of this object.
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*
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* @return A <code>String</code> representation of this object.
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*/
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public String
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toString()
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{
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return(getClass().getName() + "(" + getName() + ")");
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}
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} // Inner class Attribute
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/*************************************************************************/
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/*
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* Instance Methods
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*/
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/**
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* This method returns a list of all keys that are defined for the
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* text range. This can be an empty list if no attributes are defined.
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*
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* @return A list of keys
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*/
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public abstract Set
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getAllAttributeKeys();
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/*************************************************************************/
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/**
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* This method returns a <code>Map</code> of the attributed defined for
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* the current character.
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*
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* @return A <code>Map</code> of the attributes for the current character.
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*/
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public abstract Map
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getAttributes();
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/*************************************************************************/
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/**
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* This method returns the value of the specified attribute for the
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* current character. If the attribute is not defined for the current
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* character, <code>null</code> is returned.
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*
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* @param attrib The attribute to retrieve the value of.
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*
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* @return The value of the specified attribute
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*/
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public abstract Object
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getAttribute(AttributedCharacterIterator.Attribute attrib);
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/*************************************************************************/
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/**
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* This method returns the index of the first character in the run that
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* contains all attributes defined for the current character.
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*
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* @return The start index of the run
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*/
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public abstract int
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getRunStart();
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/*************************************************************************/
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/**
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* This method returns the index of the first character in the run that
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* contains all attributes in the specified <code>Set</code> defined for
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* the current character.
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*
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* @param attribs The <code>Set</code> of attributes.
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*
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* @return The start index of the run.
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*/
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public abstract int
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getRunStart(Set attribs);
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/*************************************************************************/
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/**
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* This method returns the index of the first character in the run that
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* contains the specified attribute defined for the current character.
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*
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* @param attrib The attribute.
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*
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* @return The start index of the run.
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*/
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public abstract int
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getRunStart(AttributedCharacterIterator.Attribute attrib);
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/*************************************************************************/
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/**
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* This method returns the index of the character after the end of the run
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* that contains all attributed defined for the current character.
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*
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* @return The end index of the run.
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*/
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public abstract int
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getRunLimit();
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/*************************************************************************/
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/**
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* This method returns the index of the character after the end of the run
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* that contains all attributes in the specified <code>Set</code> defined
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* for the current character.
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*
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* @param attribs The <code>Set</code> of attributes.
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*
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* @return The end index of the run.
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*/
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public abstract int
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getRunLimit(Set attribs);
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/*************************************************************************/
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/**
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* This methods returns the index of the character after the end of the run
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* that contains the specified attribute defined for the current character.
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*
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* @param attrib The attribute.
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*
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* @return The end index of the run.
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*/
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public abstract int
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getRunLimit(AttributedCharacterIterator.Attribute attrib);
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} // interface AttributedCharacterIterator
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