1 /* AttributedCharacterIterator.java -- Iterate over attributes
2 Copyright (C) 1998, 1999, 2004, 2006, Free Software Foundation, Inc.
4 This file is part of GNU Classpath.
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14 General Public License for more details.
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18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
21 Linking this library statically or dynamically with other modules is
22 making a combined work based on this library. Thus, the terms and
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30 terms of your choice, provided that you also meet, for each linked
31 independent module, the terms and conditions of the license of that
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36 exception statement from your version. */
41 import java.io.InvalidObjectException;
42 import java.io.Serializable;
47 * This interface extends the <code>CharacterIterator</code> interface
48 * in order to support iteration over character attributes as well as
49 * over the characters themselves.
51 * In addition to attributes of specific characters, this interface
52 * supports the concept of the "attribute run", which is an attribute
53 * that is defined for a particular value across an entire range of
54 * characters or which is undefined over a range of characters.
58 * @author Aaron M. Renn (arenn@urbanophile.com)
61 public interface AttributedCharacterIterator extends CharacterIterator
64 * Defines attribute keys that are used as text attributes.
66 public static class Attribute implements Serializable
68 private static final long serialVersionUID = -9142742483513960612L;
71 * This is the attribute for the language of the text. The value of
72 * attributes of this key type are instances of <code>Locale</code>.
74 public static final Attribute LANGUAGE = new Attribute("language");
77 * This is the attribute for the reading form of text. This is used
78 * for storing pronunciation along with the written text for languages
79 * which need it. The value of attributes of this key type are
80 * instances of <code>Annotation</code> which wrappers a
81 * <code>String</code>.
83 public static final Attribute READING = new Attribute("reading");
86 * This is the attribute for input method segments. The value of attributes
87 * of this key type are instances of <code>Annotation</code> which wrapper
88 * a <code>String</code>.
90 public static final Attribute INPUT_METHOD_SEGMENT =
91 new Attribute("input_method_segment");
94 * The name of the attribute key
100 * Initializes a new instance of this class with the specified name.
102 * @param name The name of this attribute key.
104 protected Attribute(String name)
110 * Returns the name of this attribute.
112 * @return The attribute name
114 protected String getName()
120 * Resolves an instance of
121 * <code>AttributedCharacterIterator.Attribute</code>
122 * that is being deserialized to one of the three pre-defined attribute
123 * constants. It does this by comparing the names of the attributes. The
124 * constant that the deserialized object resolves to is returned.
126 * @return The resolved contant value
128 * @exception InvalidObjectException If the object being deserialized
129 * cannot be resolved.
131 protected Object readResolve() throws InvalidObjectException
133 if (getName().equals(READING.getName()))
136 if (getName().equals(LANGUAGE.getName()))
139 if (getName().equals(INPUT_METHOD_SEGMENT.getName()))
140 return INPUT_METHOD_SEGMENT;
142 throw new InvalidObjectException ("Can't resolve Attribute: "
147 * Tests this object for equality against the specified object.
148 * The two objects will be considered equal if and only if:
150 * <li>The specified object is not <code>null</code>.
151 * <li>The specified object is an instance of
152 * <code>AttributedCharacterIterator.Attribute</code>.
153 * <li>The specified object has the same attribute name as this object.
156 * @param obj the <code>Object</code> to test for equality against this
159 * @return <code>true</code> if the specified object is equal to this one,
160 * <code>false</code> otherwise.
162 public final boolean equals(Object obj)
171 * Returns a hash value for this object.
173 * @return A hash value for this object.
175 public final int hashCode()
177 return super.hashCode();
181 * Returns a <code>String</code> representation of this object.
183 * @return A <code>String</code> representation of this object.
185 public String toString()
187 return getClass().getName() + "(" + getName() + ")";
190 } // Inner class Attribute
193 * Returns a list of all keys that are defined for the
194 * text range. This can be an empty list if no attributes are defined.
196 * @return A list of keys
198 Set<Attribute> getAllAttributeKeys();
201 * Returns a <code>Map</code> of the attributes defined for the current
204 * @return A <code>Map</code> of the attributes for the current character.
206 Map<Attribute, Object> getAttributes();
209 * Returns the value of the specified attribute for the
210 * current character. If the attribute is not defined for the current
211 * character, <code>null</code> is returned.
213 * @param attrib The attribute to retrieve the value of.
215 * @return The value of the specified attribute
217 Object getAttribute(AttributedCharacterIterator.Attribute attrib);
220 * Returns the index of the first character in the run that
221 * contains all attributes defined for the current character.
223 * @return The start index of the run
228 * Returns the index of the first character in the run that
229 * contains all attributes in the specified <code>Set</code> defined for
230 * the current character.
232 * @param attribs The <code>Set</code> of attributes.
234 * @return The start index of the run.
236 int getRunStart(Set<? extends Attribute> attribs);
239 * Returns the index of the first character in the run that
240 * contains the specified attribute defined for the current character.
242 * @param attrib The attribute.
244 * @return The start index of the run.
246 int getRunStart(AttributedCharacterIterator.Attribute attrib);
249 * Returns the index of the character after the end of the run
250 * that contains all attributes defined for the current character.
252 * @return The end index of the run.
257 * Returns the index of the character after the end of the run
258 * that contains all attributes in the specified <code>Set</code> defined
259 * for the current character.
261 * @param attribs The <code>Set</code> of attributes.
263 * @return The end index of the run.
265 int getRunLimit(Set<? extends Attribute> attribs);
268 * Returns the index of the character after the end of the run
269 * that contains the specified attribute defined for the current character.
271 * @param attrib The attribute.
273 * @return The end index of the run.
275 int getRunLimit(AttributedCharacterIterator.Attribute attrib);
277 } // interface AttributedCharacterIterator