|
1 package org.hibernate.collection;
3
4 import java.io.Serializable  ;
5 import java.sql.ResultSet ;
6 import java.sql.SQLException ;
7 import java.util.ArrayList ;
8 import java.util.Collection ;
9 import java.util.Iterator ;
10 import java.util.List ;
11
12 import org.dom4j.Element;
13 import org.hibernate.AssertionFailure;
14 import org.hibernate.HibernateException;
15 import org.hibernate.loader.CollectionAliases;
16 import org.hibernate.engine.SessionImplementor;
17 import org.hibernate.persister.collection.CollectionPersister;
18 import org.hibernate.type.Type;
19 import org.hibernate.util.CollectionHelper;
20
21
26 public class PersistentElementHolder extends AbstractPersistentCollection {
27 protected Element element;
28
29 public PersistentElementHolder(SessionImplementor session, Element element) {
30 super(session);
31 this.element = element;
32 setInitialized();
33 }
34
35 public Serializable getSnapshot(CollectionPersister persister)
36 throws HibernateException {
37
38 final Type elementType = persister.getElementType();
39 List elements = element.elements( persister.getElementNodeName() );
40 ArrayList snapshot = new ArrayList ( elements.size() );
41 for ( int i=0; i<elements.size(); i++ ) {
42 Element elem = (Element) elements.get(i);
43 Object value = elementType.fromXMLNode( elem, persister.getFactory() );
44 Object copy = elementType.deepCopy(value , getSession().getEntityMode(), persister.getFactory() );
45 snapshot.add(copy);
46 }
47 return snapshot;
48
49 }
50
51 public Collection getOrphans(Serializable snapshot, String entityName)
52 throws HibernateException {
53 return CollectionHelper.EMPTY_COLLECTION;
55 }
56
57 public PersistentElementHolder(SessionImplementor session, CollectionPersister persister, Serializable key)
58 throws HibernateException {
59 super(session);
60 Element owner = (Element) session.getPersistenceContext().getCollectionOwner(key, persister);
61 if (owner==null) throw new AssertionFailure("null owner");
62 final String nodeName = persister.getNodeName();
64 if ( ".".equals(nodeName) ) {
65 element = owner;
66 }
67 else {
68 element = owner.element( nodeName );
69 if (element==null) element = owner.addElement( nodeName );
70 }
71 }
72
73 public boolean isWrapper(Object collection) {
74 return element==collection;
75 }
76
77 public boolean equalsSnapshot(CollectionPersister persister) throws HibernateException {
78 Type elementType = persister.getElementType();
79
80 ArrayList snapshot = (ArrayList ) getSnapshot();
81 List elements = element.elements( persister.getElementNodeName() );
82 if ( snapshot.size()!= elements.size() ) return false;
83 for ( int i=0; i<snapshot.size(); i++ ) {
84 Object old = snapshot.get(i);
85 Element elem = (Element) elements.get(i);
86 Object current = elementType.fromXMLNode( elem, persister.getFactory() );
87 if ( elementType.isDirty( old, current, getSession() ) ) return false;
88 }
89 return true;
90 }
91
92 public boolean isSnapshotEmpty(Serializable snapshot) {
93 return ( (Collection ) snapshot ).isEmpty();
94 }
95
96 public boolean empty() {
97 return !element.elementIterator().hasNext();
98 }
99
100 public Object readFrom(ResultSet rs, CollectionPersister persister, CollectionAliases descriptor, Object owner)
101 throws HibernateException, SQLException {
102 Object object = persister.readElement( rs, owner, descriptor.getSuffixedElementAliases(), getSession() );
103 final Type elementType = persister.getElementType();
104 Element subelement = element.addElement( persister.getElementNodeName() );
105 elementType.setToXMLNode( subelement, object, persister.getFactory() );
106 return object;
107 }
108
109 public Iterator entries(CollectionPersister persister) {
110
111 final Type elementType = persister.getElementType();
112 List elements = element.elements( persister.getElementNodeName() );
113 int length = elements.size();
114 List result = new ArrayList (length);
115 for ( int i=0; i<length; i++ ) {
116 Element elem = (Element) elements.get(i);
117 Object object = elementType.fromXMLNode( elem, persister.getFactory() );
118 result.add(object);
119 }
120 return result.iterator();
121 }
122
123 public void beforeInitialize(CollectionPersister persister) {}
124
125 public boolean isDirectlyAccessible() {
126 return true;
127 }
128
129 public void initializeFromCache(CollectionPersister persister, Serializable disassembled, Object owner)
130 throws HibernateException {
131
132 Type elementType = persister.getElementType();
133 Serializable [] cached = (Serializable []) disassembled;
134 for ( int i=0; i<cached.length; i++ ) {
135 Object object = elementType.assemble( cached[i], getSession(), owner );
136 Element subelement = element.addElement( persister.getElementNodeName() );
137 elementType.setToXMLNode( subelement, object, persister.getFactory() );
138 }
139
140 }
141
142 public Serializable disassemble(CollectionPersister persister) throws HibernateException {
143
144 Type elementType = persister.getElementType();
145 List elements = element.elements( persister.getElementNodeName() );
146 int length = elements.size();
147 Serializable [] result = new Serializable [length];
148 for ( int i=0; i<length; i++ ) {
149 Element elem = (Element) elements.get(i);
150 Object object = elementType.fromXMLNode( elem, persister.getFactory() );
151 result[i] = elementType.disassemble( object, getSession(), null );
152 }
153 return result;
154 }
155
156 public Object getValue() {
157 return element;
158 }
159
160 public Iterator getDeletes(CollectionPersister persister, boolean indexIsFormula)
161 throws HibernateException {
162
163 Type elementType = persister.getElementType();
164 ArrayList snapshot = (ArrayList ) getSnapshot();
165 List elements = element.elements( persister.getElementNodeName() );
166 ArrayList result = new ArrayList ();
167 for ( int i=0; i<snapshot.size(); i++ ) {
168 Object old = snapshot.get(i);
169 if ( i >= elements.size() ) {
170 result.add(old);
171 }
172 else {
173 Element elem = (Element) elements.get(i);
174 Object object = elementType.fromXMLNode( elem, persister.getFactory() );
175 if ( elementType.isDirty( old, object, getSession() ) ) result.add(old);
176 }
177 }
178 return result.iterator();
179
180 }
181
182 public boolean needsInserting(Object entry, int i, Type elementType)
183 throws HibernateException {
184 ArrayList snapshot = (ArrayList ) getSnapshot();
185 return i>=snapshot.size() || elementType.isDirty( snapshot.get(i), entry, getSession() );
186 }
187
188 public boolean needsUpdating(Object entry, int i, Type elementType)
189 throws HibernateException {
190 return false;
191 }
192
193 public Object getIndex(Object entry, int i, CollectionPersister persister) {
194 throw new UnsupportedOperationException ();
195 }
196
197 public Object getElement(Object entry) {
198 return entry;
199 }
200
201 public Object getSnapshotElement(Object entry, int i) {
202 throw new UnsupportedOperationException ();
203 }
204
205 public boolean entryExists(Object entry, int i) {
206 return entry!=null;
207 }
208
209 }
210 |
Popular Tags |
Java API By Example, From Geeks To Geeks.