Source Code Cross Referenced for StringCharacterIterator.java in  » 6.0-JDK-Modules » j2me » java » text » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Modules » j2me » java.text 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *
003:         * @(#)StringCharacterIterator.java	1.24 06/10/03
004:         *
005:         * Portions Copyright  2000-2006 Sun Microsystems, Inc. All Rights
006:         * Reserved.  Use is subject to license terms.
007:         * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
008:         * 
009:         * This program is free software; you can redistribute it and/or
010:         * modify it under the terms of the GNU General Public License version
011:         * 2 only, as published by the Free Software Foundation.
012:         * 
013:         * This program is distributed in the hope that it will be useful, but
014:         * WITHOUT ANY WARRANTY; without even the implied warranty of
015:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
016:         * General Public License version 2 for more details (a copy is
017:         * included at /legal/license.txt).
018:         * 
019:         * You should have received a copy of the GNU General Public License
020:         * version 2 along with this work; if not, write to the Free Software
021:         * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
022:         * 02110-1301 USA
023:         * 
024:         * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
025:         * Clara, CA 95054 or visit www.sun.com if you need additional
026:         * information or have any questions.
027:         */
028:
029:        /*
030:         * (C) Copyright Taligent, Inc. 1996, 1997 - All Rights Reserved
031:         * (C) Copyright IBM Corp. 1996 - 1998 - All Rights Reserved
032:         *
033:         * The original version of this source code and documentation
034:         * is copyrighted and owned by Taligent, Inc., a wholly-owned
035:         * subsidiary of IBM. These materials are provided under terms
036:         * of a License Agreement between Taligent and Sun. This technology
037:         * is protected by multiple US and International patents.
038:         *
039:         * This notice and attribution to Taligent may not be removed.
040:         * Taligent is a registered trademark of Taligent, Inc.
041:         *
042:         */
043:
044:        package java.text;
045:
046:        /**
047:         * <code>StringCharacterIterator</code> implements the
048:         * <code>CharacterIterater</code> protocol for a <code>String</code>.
049:         * The <code>StringCharacterIterator</code> class iterates over the
050:         * entire <code>String</code>.
051:         *
052:         * @see CharacterIterator
053:         */
054:
055:        public final class StringCharacterIterator implements  CharacterIterator {
056:            private String text;
057:            private int begin;
058:            private int end;
059:            // invariant: begin <= pos <= end
060:            private int pos;
061:
062:            /**
063:             * Constructs an iterator with an initial index of 0.
064:             */
065:            public StringCharacterIterator(String text) {
066:                this (text, 0);
067:            }
068:
069:            /**
070:             * Constructs an iterator with the specified initial index.
071:             *
072:             * @param  text   The String to be iterated over
073:             * @param  pos    Initial iterator position
074:             */
075:            public StringCharacterIterator(String text, int pos) {
076:                this (text, 0, text.length(), pos);
077:            }
078:
079:            /**
080:             * Constructs an iterator over the given range of the given string, with the
081:             * index set at the specified position.
082:             *
083:             * @param  text   The String to be iterated over
084:             * @param  begin  Index of the first character
085:             * @param  end    Index of the character following the last character
086:             * @param  pos    Initial iterator position
087:             */
088:            public StringCharacterIterator(String text, int begin, int end,
089:                    int pos) {
090:                if (text == null)
091:                    throw new NullPointerException();
092:                this .text = text;
093:
094:                if (begin < 0 || begin > end || end > text.length())
095:                    throw new IllegalArgumentException(
096:                            "Invalid substring range");
097:
098:                if (pos < begin || pos > end)
099:                    throw new IllegalArgumentException("Invalid position");
100:
101:                this .begin = begin;
102:                this .end = end;
103:                this .pos = pos;
104:            }
105:
106:            /**
107:             * Reset this iterator to point to a new string.  This package-visible
108:             * method is used by other java.text classes that want to avoid allocating
109:             * new StringCharacterIterator objects every time their setText method
110:             * is called.
111:             *
112:             * @param  text   The String to be iterated over
113:             * @since 1.2
114:             */
115:            public void setText(String text) {
116:                if (text == null)
117:                    throw new NullPointerException();
118:                this .text = text;
119:                this .begin = 0;
120:                this .end = text.length();
121:                this .pos = 0;
122:            }
123:
124:            /**
125:             * Implements CharacterIterator.first() for String.
126:             * @see CharacterIterator#first
127:             */
128:            public char first() {
129:                pos = begin;
130:                return current();
131:            }
132:
133:            /**
134:             * Implements CharacterIterator.last() for String.
135:             * @see CharacterIterator#last
136:             */
137:            public char last() {
138:                if (end != begin) {
139:                    pos = end - 1;
140:                } else {
141:                    pos = end;
142:                }
143:                return current();
144:            }
145:
146:            /**
147:             * Implements CharacterIterator.setIndex() for String.
148:             * @see CharacterIterator#setIndex
149:             */
150:            public char setIndex(int p) {
151:                if (p < begin || p > end)
152:                    throw new IllegalArgumentException("Invalid index");
153:                pos = p;
154:                return current();
155:            }
156:
157:            /**
158:             * Implements CharacterIterator.current() for String.
159:             * @see CharacterIterator#current
160:             */
161:            public char current() {
162:                if (pos >= begin && pos < end) {
163:                    return text.charAt(pos);
164:                } else {
165:                    return DONE;
166:                }
167:            }
168:
169:            /**
170:             * Implements CharacterIterator.next() for String.
171:             * @see CharacterIterator#next
172:             */
173:            public char next() {
174:                if (pos < end - 1) {
175:                    pos++;
176:                    return text.charAt(pos);
177:                } else {
178:                    pos = end;
179:                    return DONE;
180:                }
181:            }
182:
183:            /**
184:             * Implements CharacterIterator.previous() for String.
185:             * @see CharacterIterator#previous
186:             */
187:            public char previous() {
188:                if (pos > begin) {
189:                    pos--;
190:                    return text.charAt(pos);
191:                } else {
192:                    return DONE;
193:                }
194:            }
195:
196:            /**
197:             * Implements CharacterIterator.getBeginIndex() for String.
198:             * @see CharacterIterator#getBeginIndex
199:             */
200:            public int getBeginIndex() {
201:                return begin;
202:            }
203:
204:            /**
205:             * Implements CharacterIterator.getEndIndex() for String.
206:             * @see CharacterIterator#getEndIndex
207:             */
208:            public int getEndIndex() {
209:                return end;
210:            }
211:
212:            /**
213:             * Implements CharacterIterator.getIndex() for String.
214:             * @see CharacterIterator#getIndex
215:             */
216:            public int getIndex() {
217:                return pos;
218:            }
219:
220:            /**
221:             * Compares the equality of two StringCharacterIterator objects.
222:             * @param obj the StringCharacterIterator object to be compared with.
223:             * @return true if the given obj is the same as this
224:             * StringCharacterIterator object; false otherwise.
225:             */
226:            public boolean equals(Object obj) {
227:                if (this  == obj)
228:                    return true;
229:                if (!(obj instanceof  StringCharacterIterator))
230:                    return false;
231:
232:                StringCharacterIterator that = (StringCharacterIterator) obj;
233:
234:                if (hashCode() != that.hashCode())
235:                    return false;
236:                if (!text.equals(that.text))
237:                    return false;
238:                if (pos != that.pos || begin != that.begin || end != that.end)
239:                    return false;
240:                return true;
241:            }
242:
243:            /**
244:             * Computes a hashcode for this iterator.
245:             * @return A hash code
246:             */
247:            public int hashCode() {
248:                return text.hashCode() ^ pos ^ begin ^ end;
249:            }
250:
251:            /**
252:             * Creates a copy of this iterator.
253:             * @return A copy of this
254:             */
255:            public Object clone() {
256:                try {
257:                    StringCharacterIterator other = (StringCharacterIterator) super 
258:                            .clone();
259:                    return other;
260:                } catch (CloneNotSupportedException e) {
261:                    throw new InternalError();
262:                }
263:            }
264:
265:        }
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