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Package: ListHandler
ListHandler
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| ListHandler(Connector, ValueFactory) |
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| context(ListDescriptor) |
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| createForReferencedList(Connector, ValueFactory) |
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| createForSimpleList(Connector, ValueFactory) |
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| extractListNode(Collection, URI) |
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| hasList(ListDescriptor) |
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| hasNext(ListDescriptor) |
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| isOldListEmpty(Resource, URI, boolean, URI) |
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| loadList(ListDescriptor) |
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| mergeList(ListValueDescriptor) |
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| owner(ListDescriptor) |
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| persistList(ListValueDescriptor) |
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| removeObsoletes(SesameIterator) |
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| sesameUri(URI) |
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| static {...} |
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| updateList(ListValueDescriptor) |
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Coverage
1: /**
2: * Copyright (C) 2016 Czech Technical University in Prague
3: *
4: * This program is free software: you can redistribute it and/or modify it under
5: * the terms of the GNU General Public License as published by the Free Software
6: * Foundation, either version 3 of the License, or (at your option) any
7: * later version.
8: *
9: * This program is distributed in the hope that it will be useful, but WITHOUT
10: * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
11: * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
12: * details. You should have received a copy of the GNU General Public License
13: * along with this program. If not, see <http://www.gnu.org/licenses/>.
14: */
15: package cz.cvut.kbss.ontodriver.sesame;
16:
17: import java.util.ArrayList;
18: import java.util.Collection;
19: import java.util.List;
20:
21: import cz.cvut.kbss.ontodriver.model.NamedResource;
22: import cz.cvut.kbss.ontodriver.sesame.util.SesameUtils;
23: import org.openrdf.model.Resource;
24: import org.openrdf.model.Statement;
25: import org.openrdf.model.URI;
26: import org.openrdf.model.Value;
27: import org.openrdf.model.ValueFactory;
28:
29: import cz.cvut.kbss.ontodriver.exception.IntegrityConstraintViolatedException;
30: import cz.cvut.kbss.ontodriver.sesame.connector.Connector;
31: import cz.cvut.kbss.ontodriver.sesame.exceptions.SesameDriverException;
32: import cz.cvut.kbss.ontodriver.descriptor.ListDescriptor;
33: import cz.cvut.kbss.ontodriver.descriptor.ListValueDescriptor;
34: import cz.cvut.kbss.ontodriver.descriptor.ReferencedListDescriptor;
35: import cz.cvut.kbss.ontodriver.descriptor.ReferencedListValueDescriptor;
36: import cz.cvut.kbss.ontodriver.descriptor.SimpleListDescriptor;
37: import cz.cvut.kbss.ontodriver.descriptor.SimpleListValueDescriptor;
38: import cz.cvut.kbss.ontodriver.model.Axiom;
39:
40: /**
41: * Base class for list handlers. </p>
42: *
43: * List handlers are responsible for loading and persisting lists.
44: *
45: * @author ledvima1
46: *
47: * @param <T>
48: * List descriptor type
49: * @param <V>
50: * List value descriptor type
51: */
52: abstract class ListHandler<T extends ListDescriptor, V extends ListValueDescriptor> {
53:
54: protected final Connector connector;
55: protected final ValueFactory vf;
56:
57: ListHandler(Connector connector, ValueFactory vf) {
58: this.connector = connector;
59: this.vf = vf;
60: }
61:
62: /**
63: * Loads axioms representing list described by the specified list
64: * descriptor.
65: *
66: * @return Collection of axioms representing sequence values
67: * @throws SesameDriverException
68: */
69: List<Axiom<NamedResource>> loadList(T listDescriptor) throws SesameDriverException {
70: final List<Axiom<NamedResource>> axioms = new ArrayList<>();
71: final SesameIterator it = createIterator(listDescriptor);
72:• while (it.hasNext()) {
73: axioms.add(it.nextAxiom());
74: }
75: return axioms;
76: }
77:
78: abstract SesameIterator createIterator(T listDescriptor) throws SesameDriverException;
79:
80: /**
81: * Persists list values specified by the descriptor. </p>
82: *
83: * The values are saved in the order in which they appear in the descriptor.
84: *
85: * @param listValueDescriptor
86: * Describes values to persist
87: * @throws SesameDriverException
88: */
89: void persistList(V listValueDescriptor) throws SesameDriverException {
90:• if (listValueDescriptor.getValues().isEmpty()) {
91: return;
92: }
93: final Collection<Statement> statements = new ArrayList<>(listValueDescriptor.getValues()
94: .size());
95: final URI head = createListHead(listValueDescriptor, statements);
96: statements.addAll(createListRest(head, listValueDescriptor));
97: connector.addStatements(statements);
98: }
99:
100: abstract URI createListHead(V valueDescriptor, Collection<Statement> listStatements) throws SesameDriverException;
101:
102: abstract List<Statement> createListRest(URI head, V valueDescriptor) throws SesameDriverException;
103:
104: /**
105: * Updates list with values specified by the descriptor. </p>
106: *
107: * @param listValueDescriptor
108: * Describes the updated values
109: * @throws SesameDriverException
110: */
111: void updateList(V listValueDescriptor) throws SesameDriverException {
112:• if (listValueDescriptor.getValues().isEmpty()) {
113: clearList(listValueDescriptor);
114:• } else if (isOldListEmpty(owner(listValueDescriptor), hasList(listValueDescriptor),
115: listValueDescriptor.getListProperty().isInferred(), context(listValueDescriptor))) {
116: persistList(listValueDescriptor);
117: } else {
118: mergeList(listValueDescriptor);
119: }
120: }
121:
122: private boolean isOldListEmpty(Resource owner, URI hasListProperty, boolean includeInferred,
123: URI context) throws SesameDriverException {
124: final Collection<Statement> stmts = connector.findStatements(owner, hasListProperty, null,
125: includeInferred, context);
126: return stmts.isEmpty();
127: }
128:
129: abstract void clearList(V listDescriptor) throws SesameDriverException;
130:
131: private void mergeList(V listDescriptor) throws SesameDriverException {
132: final SesameIterator it = iterator(listDescriptor);
133: final MergeResult mergeResult = mergeWithOriginalList(listDescriptor, it);
134: removeObsoletes(it);
135:• assert mergeResult.i > 0;
136:• assert mergeResult.previous != null;
137:• if (mergeResult.i < listDescriptor.getValues().size()) {
138: appendNewNodes(listDescriptor, mergeResult);
139: }
140: }
141:
142: abstract SesameIterator iterator(V listDescriptor) throws SesameDriverException;
143:
144: abstract MergeResult mergeWithOriginalList(V listDescriptor, SesameIterator it) throws SesameDriverException;
145:
146: abstract void appendNewNodes(V listDescriptor, MergeResult mergeResult) throws SesameDriverException;
147:
148: void removeObsoletes(SesameIterator it) throws SesameDriverException {
149:• while (it.hasNext()) {
150: it.nextNode();
151: it.remove();
152: }
153: }
154:
155: Resource extractListNode(Collection<Statement> stmts, URI nodeAssertion)
156: throws SesameDriverException {
157:• if (stmts.size() > 1) {
158: throw new IntegrityConstraintViolatedException(
159: "Invalid number of values found for assertion " + nodeAssertion
160: + ". Expected 1, got " + stmts.size());
161: }
162: final Value val = stmts.iterator().next().getObject();
163:• if (!(val instanceof Resource)) {
164: throw new IntegrityConstraintViolatedException(
165: "Invalid property value. Expected object property value, got literal.");
166: }
167: return (Resource) val;
168: }
169:
170: URI context(ListDescriptor listDescriptor) {
171: return sesameUri(listDescriptor.getContext());
172: }
173:
174: URI owner(ListDescriptor listDescriptor) {
175: return sesameUri(listDescriptor.getListOwner().getIdentifier());
176: }
177:
178: URI hasList(ListDescriptor listDescriptor) {
179: return sesameUri(listDescriptor.getListProperty().getIdentifier());
180: }
181:
182: URI hasNext(ListDescriptor listDescriptor) {
183: return sesameUri(listDescriptor.getNextNode().getIdentifier());
184: }
185:
186: URI sesameUri(java.net.URI uri) {
187: return SesameUtils.toSesameUri(uri, vf);
188: }
189:
190: /**
191: * Creates handler for simple lists.
192: *
193: * @param connector
194: * Storage connector
195: * @param vf
196: * Sesame value factory
197: * @return List handler
198: */
199: static ListHandler<SimpleListDescriptor, SimpleListValueDescriptor> createForSimpleList(
200: Connector connector, ValueFactory vf) {
201:• assert connector != null;
202:• assert vf != null;
203:
204: return new SimpleListHandler(connector, vf);
205: }
206:
207: /**
208: * Creates handler for referenced lists.
209: *
210: * @param connector
211: * Storage connector
212: * @param vf
213: * Sesame value factory
214: * @return List handler
215: */
216: static ListHandler<ReferencedListDescriptor, ReferencedListValueDescriptor> createForReferencedList(
217: Connector connector, ValueFactory vf) {
218:• assert connector != null;
219:• assert vf != null;
220:
221: return new ReferencedListHandler(connector, vf);
222: }
223:
224: static final class MergeResult {
225: protected int i;
226: protected Resource previous;
227: protected MergeResult(int i, Resource node) {
228: this.i = i;
229: this.previous = node;
230: }
231: }
232: }