Source Code Cross Referenced for AutoPopulatingList.java in  » J2EE » spring-framework-2.5 » org » springframework » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » J2EE » spring framework 2.5 » org.springframework.util 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * Copyright 2002-2006 the original author or authors.
003:         *
004:         * Licensed under the Apache License, Version 2.0 (the "License");
005:         * you may not use this file except in compliance with the License.
006:         * You may obtain a copy of the License at
007:         *
008:         *      http://www.apache.org/licenses/LICENSE-2.0
009:         *
010:         * Unless required by applicable law or agreed to in writing, software
011:         * distributed under the License is distributed on an "AS IS" BASIS,
012:         * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013:         * See the License for the specific language governing permissions and
014:         * limitations under the License.
015:         */
016:
017:        package org.springframework.util;
018:
019:        import java.lang.reflect.Modifier;
020:        import java.util.ArrayList;
021:        import java.util.Collection;
022:        import java.util.Iterator;
023:        import java.util.List;
024:        import java.util.ListIterator;
025:
026:        /**
027:         * Simple {@link List} wrapper class that allows for elements to be
028:         * automatically populated as they are requested. This is particularly
029:         * useful for data binding to {@link List Lists}, allowing for elements
030:         * to be created and added to the {@link List} in a "just in time" fashion.
031:         *
032:         * <p>Note: This class is not thread-safe. To create a thread-safe version,
033:         * use the {@link java.util.Collections#synchronizedList} utility methods.
034:         *
035:         * <p>Inspired by <code>LazyList</code> from Commons Collections.
036:         *
037:         * @author Rob Harrop
038:         * @author Juergen Hoeller
039:         * @since 2.0
040:         */
041:        public class AutoPopulatingList implements  List {
042:
043:            /**
044:             * The {@link List} that all operations are eventually delegated to.
045:             */
046:            private final List backingList;
047:
048:            /**
049:             * The {@link ElementFactory} to use to create new {@link List} elements
050:             * on demand.
051:             */
052:            private final ElementFactory elementFactory;
053:
054:            /**
055:             * Creates a new <code>AutoPopulatingList</code> that is backed by a standard
056:             * {@link ArrayList} and adds new instances of the supplied {@link Class element Class}
057:             * to the backing {@link List} on demand.
058:             */
059:            public AutoPopulatingList(Class elementClass) {
060:                this (new ArrayList(), elementClass);
061:            }
062:
063:            /**
064:             * Creates a new <code>AutoPopulatingList</code> that is backed by the supplied {@link List}
065:             * and adds new instances of the supplied {@link Class element Class} to the backing
066:             * {@link List} on demand.
067:             */
068:            public AutoPopulatingList(List backingList, Class elementClass) {
069:                this (backingList, new ReflectiveElementFactory(elementClass));
070:            }
071:
072:            /**
073:             * Creates a new <code>AutoPopulatingList</code> that is backed by a standard
074:             * {@link ArrayList} and creates new elements on demand using the supplied {@link ElementFactory}.
075:             */
076:            public AutoPopulatingList(ElementFactory elementFactory) {
077:                this (new ArrayList(), elementFactory);
078:            }
079:
080:            /**
081:             * Creates a new <code>AutoPopulatingList</code> that is backed by the supplied {@link List}
082:             * and creates new elements on demand using the supplied {@link ElementFactory}.
083:             */
084:            public AutoPopulatingList(List backingList,
085:                    ElementFactory elementFactory) {
086:                Assert.notNull(backingList, "Backing List must not be null");
087:                Assert.notNull(elementFactory,
088:                        "Element factory must not be null");
089:                this .backingList = backingList;
090:                this .elementFactory = elementFactory;
091:            }
092:
093:            public void add(int index, Object element) {
094:                this .backingList.add(index, element);
095:            }
096:
097:            public boolean add(Object o) {
098:                return this .backingList.add(o);
099:            }
100:
101:            public boolean addAll(Collection c) {
102:                return this .backingList.addAll(c);
103:            }
104:
105:            public boolean addAll(int index, Collection c) {
106:                return this .backingList.addAll(index, c);
107:            }
108:
109:            public void clear() {
110:                this .backingList.clear();
111:            }
112:
113:            public boolean contains(Object o) {
114:                return this .backingList.contains(o);
115:            }
116:
117:            public boolean containsAll(Collection c) {
118:                return this .backingList.containsAll(c);
119:            }
120:
121:            public boolean equals(Object o) {
122:                return this .backingList.equals(o);
123:            }
124:
125:            /**
126:             * Get the element at the supplied index, creating it if there is
127:             * no element at that index.
128:             */
129:            public Object get(int index) {
130:                int backingListSize = this .backingList.size();
131:
132:                Object element = null;
133:                if (index < backingListSize) {
134:                    element = this .backingList.get(index);
135:                    if (element == null) {
136:                        element = this .elementFactory.createElement(index);
137:                        this .backingList.set(index, element);
138:                    }
139:                } else {
140:                    for (int x = backingListSize; x < index; x++) {
141:                        this .backingList.add(null);
142:                    }
143:                    element = this .elementFactory.createElement(index);
144:                    this .backingList.add(element);
145:                }
146:                return element;
147:            }
148:
149:            public int hashCode() {
150:                return this .backingList.hashCode();
151:            }
152:
153:            public int indexOf(Object o) {
154:                return this .backingList.indexOf(o);
155:            }
156:
157:            public boolean isEmpty() {
158:                return this .backingList.isEmpty();
159:            }
160:
161:            public Iterator iterator() {
162:                return this .backingList.iterator();
163:            }
164:
165:            public int lastIndexOf(Object o) {
166:                return this .backingList.lastIndexOf(o);
167:            }
168:
169:            public ListIterator listIterator() {
170:                return this .backingList.listIterator();
171:            }
172:
173:            public ListIterator listIterator(int index) {
174:                return this .backingList.listIterator(index);
175:            }
176:
177:            public Object remove(int index) {
178:                return this .backingList.remove(index);
179:            }
180:
181:            public boolean remove(Object o) {
182:                return this .backingList.remove(o);
183:            }
184:
185:            public boolean removeAll(Collection c) {
186:                return this .backingList.removeAll(c);
187:            }
188:
189:            public boolean retainAll(Collection c) {
190:                return this .backingList.retainAll(c);
191:            }
192:
193:            public Object set(int index, Object element) {
194:                return this .backingList.set(index, element);
195:            }
196:
197:            public int size() {
198:                return this .backingList.size();
199:            }
200:
201:            public List subList(int fromIndex, int toIndex) {
202:                return this .backingList.subList(fromIndex, toIndex);
203:            }
204:
205:            public Object[] toArray() {
206:                return this .backingList.toArray();
207:            }
208:
209:            public Object[] toArray(Object[] a) {
210:                return this .backingList.toArray(a);
211:            }
212:
213:            /**
214:             * Factory interface for creating elements for an index-based access
215:             * data structure such as a {@link java.util.List}.
216:             */
217:            public interface ElementFactory {
218:
219:                /**
220:                 * Create the element for the supplied index.
221:                 * @return the element object
222:                 * @throws ElementInstantiationException if the instantiation process failed
223:                 * (any exception thrown by a target constructor should be propagated as-is)
224:                 */
225:                Object createElement(int index)
226:                        throws ElementInstantiationException;
227:            }
228:
229:            /**
230:             * Exception to be thrown from ElementFactory.
231:             */
232:            public static class ElementInstantiationException extends
233:                    RuntimeException {
234:
235:                public ElementInstantiationException(String msg) {
236:                    super (msg);
237:                }
238:            }
239:
240:            /**
241:             * Reflective implementation of the ElementFactory interface,
242:             * using <code>Class.newInstance()</code> on a given element class.
243:             * @see java.lang.Class#newInstance()
244:             */
245:            private static class ReflectiveElementFactory implements 
246:                    ElementFactory {
247:
248:                private final Class elementClass;
249:
250:                public ReflectiveElementFactory(Class elementClass) {
251:                    Assert.notNull(elementClass,
252:                            "Element clas must not be null");
253:                    Assert.isTrue(!elementClass.isInterface(),
254:                            "Element class must not be an interface type");
255:                    Assert.isTrue(!Modifier.isAbstract(elementClass
256:                            .getModifiers()),
257:                            "Element class cannot be an abstract class");
258:                    this .elementClass = elementClass;
259:                }
260:
261:                public Object createElement(int index) {
262:                    try {
263:                        return this .elementClass.newInstance();
264:                    } catch (InstantiationException ex) {
265:                        throw new ElementInstantiationException(
266:                                "Unable to instantiate element class ["
267:                                        + this .elementClass.getName()
268:                                        + "]. Root cause is " + ex);
269:                    } catch (IllegalAccessException ex) {
270:                        throw new ElementInstantiationException(
271:                                "Cannot access element class ["
272:                                        + this .elementClass.getName()
273:                                        + "]. Root cause is " + ex);
274:                    }
275:                }
276:            }
277:
278:        }
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