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+/*
+ * Copyright 1997-2004 Sun Microsystems, Inc. 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. Sun designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.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 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 null for the entire range, or
+ * <li>the attribute value is defined and has the same non-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>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 AttributedCharacterIterator.Attribute and its
+ * subclasses, such as 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 AttributedCharacterIterator and AttributedString.
+ * @see AttributedCharacterIterator
+ * @see AttributedString
+ * @since 1.2
+ */
+
+ public static class Attribute implements Serializable {
+
+ /**
+ * The name of this Attribute. The name is used primarily by 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 instanceMap = new HashMap(7);
+
+ /**
+ * Constructs an Attribute with the given name.
+ */
+ 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)</code> if <code>x</code> and <code>y</code> 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 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, "(", a name identifying the attribute and ")".
+ */
+ public String toString() {
+ return getClass().getName() + "(" + name + ")";
+ }
+
+ /**
+ * Returns the name of the attribute.
+ */
+ protected String getName() {
+ return name;
+ }
+
+ /**
+ * Resolves instances being deserialized to the predefined constants.
+ */
+ protected Object readResolve() throws InvalidObjectException {
+ if (this.getClass() != Attribute.class) {
+ throw new InvalidObjectException("subclass didn't correctly implement readResolve");
+ }
+
+ Attribute instance = (Attribute) 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 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 Annotation holding instances of 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 Annotation holding a 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
+ 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.
+ */
+ public int getRunStart();
+
+ /**
+ * Returns the index of the first character of the run
+ * with respect to the given attribute containing the current character.
+ */
+ public int getRunStart(Attribute attribute);
+
+ /**
+ * Returns the index of the first character of the run
+ * with respect to the given attributes containing the current character.
+ */
+ 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.
+ */
+ public int getRunLimit();
+
+ /**
+ * Returns the index of the first character following the run
+ * with respect to the given attribute containing the current character.
+ */
+ public int getRunLimit(Attribute attribute);
+
+ /**
+ * Returns the index of the first character following the run
+ * with respect to the given attributes containing the current character.
+ */
+ public int getRunLimit(Set<? extends Attribute> attributes);
+
+ /**
+ * Returns a map with the attributes defined on the current
+ * character.
+ */
+ public Map<Attribute,Object> getAttributes();
+
+ /**
+ * Returns the value of the named attribute for the current character.
+ * Returns null if the attribute is not defined.
+ * @param attribute the key of the attribute whose value is requested.
+ */
+ 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.
+ */
+ public Set<Attribute> getAllAttributeKeys();
+};