Source Code Cross Referenced for IntCollections.java in  » Library » Apache-commons-primitives-1.0 » org » apache » commons » collections » primitives » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Library » Apache commons primitives 1.0 » org.apache.commons.collections.primitives 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * $Header: /home/cvs/jakarta-commons/primitives/src/java/org/apache/commons/collections/primitives/IntCollections.java,v 1.2 2003/10/27 23:21:14 rwaldhoff Exp $
003:         * ====================================================================
004:         * The Apache Software License, Version 1.1
005:         *
006:         * Copyright (c) 2003 The Apache Software Foundation.  All rights
007:         * reserved.
008:         *
009:         * Redistribution and use in source and binary forms, with or without
010:         * modification, are permitted provided that the following conditions
011:         * are met:
012:         *
013:         * 1. Redistributions of source code must retain the above copyright
014:         *    notice, this list of conditions and the following disclaimer.
015:         *
016:         * 2. Redistributions in binary form must reproduce the above copyright
017:         *    notice, this list of conditions and the following disclaimer in
018:         *    the documentation and/or other materials provided with the
019:         *    distribution.
020:         *
021:         * 3. The end-user documentation included with the redistribution, if
022:         *    any, must include the following acknowledgement:
023:         *       "This product includes software developed by the
024:         *        Apache Software Foundation (http://www.apache.org/)."
025:         *    Alternately, this acknowledgement may appear in the software itself,
026:         *    if and wherever such third-party acknowledgements normally appear.
027:         *
028:         * 4. The names "The Jakarta Project", "Commons", and "Apache Software
029:         *    Foundation" must not be used to endorse or promote products derived
030:         *    from this software without prior written permission. For written
031:         *    permission, please contact apache@apache.org.
032:         *
033:         * 5. Products derived from this software may not be called "Apache"
034:         *    nor may "Apache" appear in their names without prior written
035:         *    permission of the Apache Software Foundation.
036:         *
037:         * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
038:         * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
039:         * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
040:         * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
041:         * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
042:         * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
043:         * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
044:         * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
045:         * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
046:         * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
047:         * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
048:         * SUCH DAMAGE.
049:         * ====================================================================
050:         *
051:         * This software consists of voluntary contributions made by many
052:         * individuals on behalf of the Apache Software Foundation.  For more
053:         * information on the Apache Software Foundation, please see
054:         * <http://www.apache.org/>.
055:         *
056:         */
057:
058:        package org.apache.commons.collections.primitives;
059:
060:        import org.apache.commons.collections.primitives.decorators.UnmodifiableIntIterator;
061:        import org.apache.commons.collections.primitives.decorators.UnmodifiableIntList;
062:        import org.apache.commons.collections.primitives.decorators.UnmodifiableIntListIterator;
063:
064:        /**
065:         * This class consists exclusively of static methods that operate on or
066:         * return IntCollections.
067:         * <p>
068:         * The methods of this class all throw a NullPointerException if the 
069:         * provided collection is null.
070:         * 
071:         * @version $Revision: 1.2 $ $Date: 2003/10/27 23:21:14 $
072:         * 
073:         * @author Rodney Waldhoff 
074:         */
075:        public final class IntCollections {
076:
077:            /**
078:             * Returns an unmodifiable IntList containing only the specified element.
079:             * @param value the single value
080:             * @return an unmodifiable IntList containing only the specified element.
081:             */
082:            public static IntList singletonIntList(int value) {
083:                // TODO: a specialized implementation of IntList may be more performant
084:                IntList list = new ArrayIntList(1);
085:                list.add(value);
086:                return UnmodifiableIntList.wrap(list);
087:            }
088:
089:            /**
090:             * Returns an unmodifiable IntIterator containing only the specified element.
091:             * @param value the single value
092:             * @return an unmodifiable IntIterator containing only the specified element.
093:             */
094:            public static IntIterator singletonIntIterator(int value) {
095:                return singletonIntList(value).iterator();
096:            }
097:
098:            /**
099:             * Returns an unmodifiable IntListIterator containing only the specified element.
100:             * @param value the single value
101:             * @return an unmodifiable IntListIterator containing only the specified element.
102:             */
103:            public static IntListIterator singletonIntListIterator(int value) {
104:                return singletonIntList(value).listIterator();
105:            }
106:
107:            /**
108:             * Returns an unmodifiable version of the given non-null IntList.
109:             * @param list the non-null IntList to wrap in an unmodifiable decorator
110:             * @return an unmodifiable version of the given non-null IntList
111:             * @throws NullPointerException if the given IntList is null
112:             * @see org.apache.commons.collections.primitives.decorators.UnmodifiableIntList#wrap
113:             */
114:            public static IntList unmodifiableIntList(IntList list)
115:                    throws NullPointerException {
116:                if (null == list) {
117:                    throw new NullPointerException();
118:                }
119:                return UnmodifiableIntList.wrap(list);
120:            }
121:
122:            /**
123:             * Returns an unmodifiable version of the given non-null IntIterator.
124:             * @param iter the non-null IntIterator to wrap in an unmodifiable decorator
125:             * @return an unmodifiable version of the given non-null IntIterator
126:             * @throws NullPointerException if the given IntIterator is null
127:             * @see org.apache.commons.collections.primitives.decorators.UnmodifiableIntIterator#wrap
128:             */
129:            public static IntIterator unmodifiableIntIterator(IntIterator iter) {
130:                if (null == iter) {
131:                    throw new NullPointerException();
132:                }
133:                return UnmodifiableIntIterator.wrap(iter);
134:            }
135:
136:            /**
137:             * Returns an unmodifiable version of the given non-null IntListIterator.
138:             * @param iter the non-null IntListIterator to wrap in an unmodifiable decorator
139:             * @return an unmodifiable version of the given non-null IntListIterator
140:             * @throws NullPointerException if the given IntListIterator is null
141:             * @see org.apache.commons.collections.primitives.decorators.UnmodifiableIntListIterator#wrap
142:             */
143:            public static IntListIterator unmodifiableIntListIterator(
144:                    IntListIterator iter) {
145:                if (null == iter) {
146:                    throw new NullPointerException();
147:                }
148:                return UnmodifiableIntListIterator.wrap(iter);
149:            }
150:
151:            /**
152:             * Returns an unmodifiable, empty IntList.
153:             * @return an unmodifiable, empty IntList.
154:             * @see #EMPTY_INT_LIST
155:             */
156:            public static IntList getEmptyIntList() {
157:                return EMPTY_INT_LIST;
158:            }
159:
160:            /**
161:             * Returns an unmodifiable, empty IntIterator
162:             * @return an unmodifiable, empty IntIterator.
163:             * @see #EMPTY_INT_ITERATOR
164:             */
165:            public static IntIterator getEmptyIntIterator() {
166:                return EMPTY_INT_ITERATOR;
167:            }
168:
169:            /**
170:             * Returns an unmodifiable, empty IntListIterator
171:             * @return an unmodifiable, empty IntListIterator.
172:             * @see #EMPTY_INT_LIST_ITERATOR
173:             */
174:            public static IntListIterator getEmptyIntListIterator() {
175:                return EMPTY_INT_LIST_ITERATOR;
176:            }
177:
178:            /**
179:             * An unmodifiable, empty IntList
180:             * @see #getEmptyIntList
181:             */
182:            public static final IntList EMPTY_INT_LIST = unmodifiableIntList(new ArrayIntList(
183:                    0));
184:
185:            /**
186:             * An unmodifiable, empty IntIterator
187:             * @see #getEmptyIntIterator
188:             */
189:            public static final IntIterator EMPTY_INT_ITERATOR = unmodifiableIntIterator(EMPTY_INT_LIST
190:                    .iterator());
191:
192:            /**
193:             * An unmodifiable, empty IntListIterator
194:             * @see #getEmptyIntListIterator
195:             */
196:            public static final IntListIterator EMPTY_INT_LIST_ITERATOR = unmodifiableIntListIterator(EMPTY_INT_LIST
197:                    .listIterator());
198:        }
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