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	/*
	* Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved.
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 only, as
	* published by the Free Software Foundation. Oracle designates this
	* particular file as subject to the "Classpath" exception as provided
	* by Oracle in the LICENSE file that accompanied this code.
	*
	* This code is distributed in the hope that it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/

	package java.text;

	import java.io.InvalidObjectException;
	import java.io.Serializable;
	import java.util.HashMap;
	import java.util.Map;
	import java.util.Set;

	/**
	* An {@code AttributedCharacterIterator} allows iteration through both text and
	* related attribute information.
	*
	* <p>
	* An attribute is a key/value pair, identified by the key. No two
	* attributes on a given character can have the same key.
	*
	* <p>The values for an attribute are immutable, or must not be mutated
	* by clients or storage. They are always passed by reference, and not
	* cloned.
	*
	* <p>A <em>run with respect to an attribute</em> is a maximum text range for
	* which:
	* <ul>
	* <li>the attribute is undefined or {@code null} for the entire range, or
	* <li>the attribute value is defined and has the same non-{@code null} value for the
	* entire range.
	* </ul>
	*
	* <p>A <em>run with respect to a set of attributes</em> is a maximum text range for
	* which this condition is met for each member attribute.
	*
	* <p>When getting a run with no explicit attributes specified (i.e.,
	* calling {@link #getRunStart()} and {@link #getRunLimit()}), any
	* contiguous text segments having the same attributes (the same set
	* of attribute/value pairs) are treated as separate runs if the
	* attributes have been given to those text segments separately.
	*
	* <p>The returned indexes are limited to the range of the iterator.
	*
	* <p>The returned attribute information is limited to runs that contain
	* the current character.
	*
	* <p>
	* Attribute keys are instances of {@link AttributedCharacterIterator.Attribute} and its
	* subclasses, such as {@link java.awt.font.TextAttribute}.
	*
	* @see AttributedCharacterIterator.Attribute
	* @see java.awt.font.TextAttribute
	* @see AttributedString
	* @see Annotation
	* @since 1.2
	*/

	public interface AttributedCharacterIterator extends CharacterIterator {

	/**
	* Defines attribute keys that are used to identify text attributes. These
	* keys are used in {@code AttributedCharacterIterator} and {@code AttributedString}.
	* @see AttributedCharacterIterator
	* @see AttributedString
	* @since 1.2
	*/

	public static class Attribute implements Serializable {

	/**
	* The name of this {@code Attribute}. The name is used primarily by {@code readResolve}
	* to look up the corresponding predefined instance when deserializing
	* an instance.
	* @serial
	*/
	private String name;

	// table of all instances in this class, used by readResolve
	private static final Map<String, Attribute> instanceMap = new HashMap<>(7);

	/**
	* Constructs an {@code Attribute} with the given name.
	*
	* @param name the name of {@code Attribute}
	*/
	protected Attribute(String name) {
	this.name = name;
	if (this.getClass() == Attribute.class) {
	instanceMap.put(name, this);
	}
	}

	/**
	* Compares two objects for equality. This version only returns true
	* for {@code x.equals(y)} if {@code x} and {@code y} refer
	* to the same object, and guarantees this for all subclasses.
	*/
	public final boolean equals(Object obj) {
	return super.equals(obj);
	}

	/**
	* Returns a hash code value for the object. This version is identical to
	* the one in {@code Object}, but is also final.
	*/
	public final int hashCode() {
	return super.hashCode();
	}

	/**
	* Returns a string representation of the object. This version returns the
	* concatenation of class name, {@code "("}, a name identifying the attribute
	* and {@code ")"}.
	*/
	public String toString() {
	return getClass().getName() + "(" + name + ")";
	}

	/**
	* Returns the name of the attribute.
	*
	* @return the name of {@code Attribute}
	*/
	protected String getName() {
	return name;
	}

	/**
	* Resolves instances being deserialized to the predefined constants.
	*
	* @return the resolved {@code Attribute} object
	* @throws InvalidObjectException if the object to resolve is not
	* an instance of {@code Attribute}
	*/
	@java.io.Serial
	protected Object readResolve() throws InvalidObjectException {
	if (this.getClass() != Attribute.class) {
	throw new InvalidObjectException("subclass didn't correctly implement readResolve");
	}

	Attribute instance = instanceMap.get(getName());
	if (instance != null) {
	return instance;
	} else {
	throw new InvalidObjectException("unknown attribute name");
	}
	}

	/**
	* Attribute key for the language of some text.
	* <p> Values are instances of {@link java.util.Locale Locale}.
	* @see java.util.Locale
	*/
	public static final Attribute LANGUAGE = new Attribute("language");

	/**
	* Attribute key for the reading of some text. In languages where the written form
	* and the pronunciation of a word are only loosely related (such as Japanese),
	* it is often necessary to store the reading (pronunciation) along with the
	* written form.
	* <p>Values are instances of {@link Annotation} holding instances of {@link String}.
	*
	* @see Annotation
	* @see java.lang.String
	*/
	public static final Attribute READING = new Attribute("reading");

	/**
	* Attribute key for input method segments. Input methods often break
	* up text into segments, which usually correspond to words.
	* <p>Values are instances of {@link Annotation} holding a {@code null} reference.
	* @see Annotation
	*/
	public static final Attribute INPUT_METHOD_SEGMENT = new Attribute("input_method_segment");

	// make sure the serial version doesn't change between compiler versions
	@java.io.Serial
	private static final long serialVersionUID = -9142742483513960612L;

	};

	/**
	* Returns the index of the first character of the run
	* with respect to all attributes containing the current character.
	*
	* <p>Any contiguous text segments having the same attributes (the
	* same set of attribute/value pairs) are treated as separate runs
	* if the attributes have been given to those text segments separately.
	*
	* @return the index of the first character of the run
	*/
	public int getRunStart();

	/**
	* Returns the index of the first character of the run
	* with respect to the given {@code attribute} containing the current character.
	*
	* @param attribute the desired attribute.
	* @return the index of the first character of the run
	*/
	public int getRunStart(Attribute attribute);

	/**
	* Returns the index of the first character of the run
	* with respect to the given {@code attributes} containing the current character.
	*
	* @param attributes a set of the desired attributes.
	* @return the index of the first character of the run
	*/
	public int getRunStart(Set<? extends Attribute> attributes);

	/**
	* Returns the index of the first character following the run
	* with respect to all attributes containing the current character.
	*
	* <p>Any contiguous text segments having the same attributes (the
	* same set of attribute/value pairs) are treated as separate runs
	* if the attributes have been given to those text segments separately.
	*
	* @return the index of the first character following the run
	*/
	public int getRunLimit();

	/**
	* Returns the index of the first character following the run
	* with respect to the given {@code attribute} containing the current character.
	*
	* @param attribute the desired attribute
	* @return the index of the first character following the run
	*/
	public int getRunLimit(Attribute attribute);

	/**
	* Returns the index of the first character following the run
	* with respect to the given {@code attributes} containing the current character.
	*
	* @param attributes a set of the desired attributes
	* @return the index of the first character following the run
	*/
	public int getRunLimit(Set<? extends Attribute> attributes);

	/**
	* Returns a map with the attributes defined on the current
	* character.
	*
	* @return a map with the attributes defined on the current character
	*/
	public Map<Attribute,Object> getAttributes();

	/**
	* Returns the value of the named {@code attribute} for the current character.
	* Returns {@code null} if the {@code attribute} is not defined.
	*
	* @param attribute the desired attribute
	* @return the value of the named {@code attribute} or {@code null}
	*/
	public Object getAttribute(Attribute attribute);

	/**
	* Returns the keys of all attributes defined on the
	* iterator's text range. The set is empty if no
	* attributes are defined.
	*
	* @return the keys of all attributes
	*/
	public Set<Attribute> getAllAttributeKeys();
	};

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