Source Code Cross Referenced for PropertyMap.java in  » GIS » GeoTools-2.4.1 » org » geotools » metadata » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » GIS » GeoTools 2.4.1 » org.geotools.metadata 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         *    GeoTools - OpenSource mapping toolkit
003:         *    http://geotools.org
004:         *    (C) 2007, GeoTools Project Managment Committee (PMC)
005:         *   
006:         *    This library is free software; you can redistribute it and/or
007:         *    modify it under the terms of the GNU Lesser General Public
008:         *    License as published by the Free Software Foundation;
009:         *    version 2.1 of the License.
010:         *
011:         *    This library is distributed in the hope that it will be useful,
012:         *    but WITHOUT ANY WARRANTY; without even the implied warranty of
013:         *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
014:         *    Lesser General Public License for more details.
015:         */
016:        package org.geotools.metadata;
017:
018:        // J2SE dependencies
019:        import java.util.AbstractMap;
020:        import java.util.AbstractSet;
021:        import java.util.Iterator;
022:        import java.util.Map;
023:        import java.util.NoSuchElementException;
024:        import java.util.Set;
025:
026:        // Geotools dependencies
027:        import org.geotools.resources.Utilities;
028:
029:        /**
030:         * A view of a metadata object as a map. Keys are property names and values
031:         * are the value returned by the {@code getFoo()} method using reflection.
032:         *
033:         * @since 2.4
034:         * @source $URL: http://svn.geotools.org/geotools/tags/2.4.1/modules/library/metadata/src/main/java/org/geotools/metadata/PropertyMap.java $
035:         * @version $Id: PropertyMap.java 25157 2007-04-12 15:59:03Z desruisseaux $
036:         * @author Martin Desruisseaux (Geomatys)
037:         *
038:         * @see MetadataStandard#asMap
039:         */
040:        final class PropertyMap extends AbstractMap/*<String,Object>*/{
041:            /**
042:             * The metadata object to wrap.
043:             */
044:            private final Object metadata;
045:
046:            /**
047:             * The accessor to use for the metadata.
048:             */
049:            private final PropertyAccessor accessor;
050:
051:            /**
052:             * A view of the mappings contained in this map.
053:             */
054:            private final Set/*<Map.Entry<String,Object>>*/entrySet;
055:
056:            /**
057:             * Creates a property map for the specified metadata and accessor.
058:             */
059:            public PropertyMap(final Object metadata,
060:                    final PropertyAccessor accessor) {
061:                this .metadata = metadata;
062:                this .accessor = accessor;
063:                entrySet = new Entries();
064:            }
065:
066:            /**
067:             * Returns {@code true} if this map contains no key-value mappings.
068:             */
069:            public boolean isEmpty() {
070:                return entrySet().isEmpty();
071:            }
072:
073:            /**
074:             * Returns {@code true} if this map contains a mapping for the specified key. 
075:             */
076:            public boolean containsKey(final Object key) {
077:                return get(key) != null;
078:            }
079:
080:            /**
081:             * Returns the value to which the specified key is mapped, or {@code null}
082:             * if this map contains no mapping for the key.
083:             */
084:            public Object get(final Object key) {
085:                final Object value = accessor.get(accessor
086:                        .indexOf((String) key), metadata);
087:                return PropertyAccessor.isEmpty(value) ? null : value;
088:            }
089:
090:            /**
091:             * Associates the specified value with the specified key in this map.
092:             *
093:             * @throws IllegalArgumentException if the specified property can't be set.
094:             */
095:            public Object put(final Object key, final Object value)
096:                    throws IllegalArgumentException {
097:                return accessor.set(accessor.indexOf((String) key), metadata,
098:                        value);
099:            }
100:
101:            /**
102:             * Removes the mapping for a key from this map if it is present.
103:             */
104:            public Object remove(final Object key) {
105:                return put(key, null);
106:            }
107:
108:            /**
109:             * Returns a view of the mappings contained in this map. 
110:             */
111:            public Set/*<Map.Entry<String,Object>>*/entrySet() {
112:                return entrySet;
113:            }
114:
115:            /**
116:             * A map entry for a given property.
117:             *
118:             * @author Martin Desruisseaux
119:             */
120:            private final class Property/*<String,Object>*/implements 
121:                    Map.Entry {
122:                /**
123:                 * The property index.
124:                 */
125:                final int index;
126:
127:                /**
128:                 * Creates an entry for the given property.
129:                 */
130:                Property(final int index) {
131:                    this .index = index;
132:                }
133:
134:                /**
135:                 * Creates an entry for the given property.
136:                 */
137:                Property(final String property) {
138:                    index = accessor.indexOf(property);
139:                }
140:
141:                /**
142:                 * Returns the key corresponding to this entry.
143:                 */
144:                public Object getKey() {
145:                    return accessor.name(index);
146:                }
147:
148:                /**
149:                 * Returns the value corresponding to this entry.
150:                 */
151:                public Object getValue() {
152:                    final Object value = accessor.get(index, metadata);
153:                    return PropertyAccessor.isEmpty(value) ? null : value;
154:                }
155:
156:                /**
157:                 * Replaces the value corresponding to this entry with the specified value.
158:                 */
159:                public Object setValue(Object value) {
160:                    return accessor.set(index, metadata, value);
161:                }
162:
163:                /**
164:                 * Compares the specified entry with this one for equality.
165:                 */
166:                public boolean equals(final Map.Entry entry) {
167:                    return Utilities.equals(getKey(), entry.getKey())
168:                            && Utilities.equals(getValue(), entry.getValue());
169:                }
170:
171:                /**
172:                 * Compares the specified object with this entry for equality.
173:                 * Criterions are specified by the {@link Map.Entry} contract.
174:                 */
175:                public boolean equals(final Object object) {
176:                    return (object instanceof  Map.Entry)
177:                            && equals((Map.Entry) object);
178:                }
179:
180:                /**
181:                 * Returns the hash code value for this map entry. The
182:                 * formula is specified by the {@link Map.Entry} contract.
183:                 */
184:                public int hashCode() {
185:                    Object x = getKey();
186:                    int code = (x != null) ? x.hashCode() : 0;
187:                    x = getValue();
188:                    if (x != null) {
189:                        code ^= x.hashCode();
190:                    }
191:                    return code;
192:                }
193:            }
194:
195:            /**
196:             * The iterator over the {@link Property} elements contained in a {@link Entries} set.
197:             *
198:             * @author Martin Desruisseaux
199:             */
200:            private final class Iter implements  Iterator {
201:                /**
202:                 * The current and the next property, or {@code null} if the iteration is over.
203:                 */
204:                private Property current, next;
205:
206:                /**
207:                 * Creates en iterator.
208:                 */
209:                Iter() {
210:                    move(0);
211:                }
212:
213:                /**
214:                 * Move {@link #next} to the first property with a valid value,
215:                 * starting at the specified index.
216:                 */
217:                private void move(int index) {
218:                    final int count = accessor.count();
219:                    while (index < count) {
220:                        if (!PropertyAccessor.isEmpty(accessor.get(index,
221:                                metadata))) {
222:                            next = new Property(index);
223:                            return;
224:                        }
225:                        index++;
226:                    }
227:                    next = null;
228:                }
229:
230:                /**
231:                 * Returns {@code true} if the iteration has more elements.
232:                 */
233:                public boolean hasNext() {
234:                    return next != null;
235:                }
236:
237:                /**
238:                 * Returns the next element in the iteration.
239:                 */
240:                public Object next() {
241:                    if (next != null) {
242:                        current = next;
243:                        move(next.index + 1);
244:                        return current;
245:                    } else {
246:                        throw new NoSuchElementException();
247:                    }
248:                }
249:
250:                /**
251:                 * Removes from the underlying collection the last element returned by the iterator.
252:                 */
253:                public void remove() {
254:                    if (current != null) {
255:                        current.setValue(null);
256:                        current = null;
257:                    } else {
258:                        throw new IllegalStateException();
259:                    }
260:                }
261:            }
262:
263:            /**
264:             * View of the mapping contained in the map.
265:             *
266:             * @author Martin Desruisseaux
267:             */
268:            private final class Entries extends AbstractSet/*<Map.Entry<String,Object>>*/{
269:                /**
270:                 * Creates an entry set.
271:                 */
272:                Entries() {
273:                }
274:
275:                /**
276:                 * Returns an iterator over the elements contained in this collection.
277:                 */
278:                public Iterator iterator() {
279:                    return new Iter();
280:                }
281:
282:                /**
283:                 * Returns the number of elements in this collection. 
284:                 */
285:                public int size() {
286:                    return accessor.count(metadata, Integer.MAX_VALUE);
287:                }
288:
289:                /**
290:                 * Returns true if this collection contains no elements.
291:                 */
292:                public boolean isEmpty() {
293:                    return accessor.count(metadata, 1) == 0;
294:                }
295:
296:                /**
297:                 * Returns {@code true} if this collection contains the specified element.
298:                 */
299:                public boolean contains(final Object object) {
300:                    if (object instanceof  Map.Entry) {
301:                        final Map.Entry entry = (Map.Entry) object;
302:                        final Object key = entry.getKey();
303:                        if (key instanceof  String) {
304:                            return new Property((String) key).equals(entry);
305:                        }
306:                    }
307:                    return false;
308:                }
309:            }
310:        }
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