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Package: SimpleListIterator
SimpleListIterator
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| SimpleListIterator(SimpleListDescriptor, Connector, ValueFactory) |
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| currentContent() |
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| hasNext() |
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| init() |
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| nextAxiom() |
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| nextInternal() |
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| nextNode() |
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| remove() |
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| replaceCurrentWith(NamedResource) |
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| static {...} |
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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.Collections;
20: import java.util.List;
21:
22: import org.openrdf.model.Resource;
23: import org.openrdf.model.Statement;
24: import org.openrdf.model.URI;
25: import org.openrdf.model.ValueFactory;
26:
27: import cz.cvut.kbss.ontodriver.sesame.connector.Connector;
28: import cz.cvut.kbss.ontodriver.sesame.exceptions.SesameDriverException;
29: import cz.cvut.kbss.ontodriver.descriptor.SimpleListDescriptor;
30: import cz.cvut.kbss.ontodriver.model.Assertion;
31: import cz.cvut.kbss.ontodriver.model.Axiom;
32: import cz.cvut.kbss.ontodriver.model.NamedResource;
33:
34: class SimpleListIterator extends AbstractSesameIterator {
35:
36: private final SimpleListDescriptor listDescriptor;
37:
38: private URI currentProperty;
39:
40: private Statement current;
41: private Collection<Statement> next;
42:
43: public SimpleListIterator(SimpleListDescriptor listDescriptor, Connector connector,
44: ValueFactory vf) throws SesameDriverException {
45: super(listDescriptor, connector, vf);
46: this.listDescriptor = listDescriptor;
47: this.currentProperty = hasListProperty;
48: init();
49: }
50:
51: private void init() throws SesameDriverException {
52: this.next = connector.findStatements(listOwner, hasListProperty, null, includeInferred,
53: context);
54: }
55:
56: @Override
57: public boolean hasNext() {
58:• return (!next.isEmpty());
59: }
60:
61: @Override
62: public Resource nextNode() throws SesameDriverException {
63: nextInternal();
64:• assert current.getObject() instanceof Resource;
65:
66: return (Resource) current.getObject();
67: }
68:
69: private void nextInternal() throws SesameDriverException {
70:• if (!hasNext()) {
71: throw new IllegalStateException();
72: }
73: checkSuccessorMax(next, currentProperty);
74: this.current = next.iterator().next();
75: this.currentProperty = current.getPredicate();
76: checkNodeIsResource(current);
77: final Resource elem = (Resource) current.getObject();
78: this.next = connector.findStatements(elem, hasNextProperty, null, includeInferred, context);
79: }
80:
81: @Override
82: public Resource currentContent() throws SesameDriverException {
83:• assert current.getObject() instanceof Resource;
84:
85: return (Resource) current.getObject();
86: }
87:
88: @Override
89: public Axiom<NamedResource> nextAxiom() throws SesameDriverException {
90: nextInternal();
91:• assert current.getObject() instanceof Resource;
92:
93:• final Assertion assertion = current.getPredicate() == hasListProperty ? listDescriptor
94: .getListProperty() : listDescriptor.getNextNode();
95: return createAxiom(current.getSubject(), assertion, (Resource) current.getObject());
96: }
97:
98: @Override
99: public void replaceCurrentWith(NamedResource newNode) throws SesameDriverException {
100:• assert current.getObject() instanceof Resource;
101: final Resource newNodeSesame = vf.createURI(newNode.getIdentifier().toString());
102: final List<Statement> toAdd = new ArrayList<>(2);
103: final List<Statement> toRemove = new ArrayList<>(2);
104: toRemove.add(current);
105: final Statement newCurrent = vf.createStatement(current.getSubject(), currentProperty,
106: newNodeSesame, context);
107: // From the current subject to the new node
108: toAdd.add(newCurrent);
109:• if (hasNext()) {
110: toRemove.addAll(next);
111: final Statement stmt = next.iterator().next();
112: checkNodeIsResource(stmt);
113: final Resource nextNode = (Resource) stmt.getObject();
114:• if (!newNodeSesame.equals(nextNode)) {
115: // From the new node to the next node
116: final Statement newNext = vf.createStatement(newNodeSesame, hasNextProperty,
117: nextNode, context);
118: toAdd.add(newNext);
119: this.next = Collections.singletonList(newNext);
120: } else {
121: this.next = connector.findStatements(newNodeSesame, hasNextProperty, null,
122: includeInferred, context);
123: }
124: } else {
125: this.next = Collections.emptyList();
126: }
127: this.current = null;
128: connector.removeStatements(toRemove);
129: connector.addStatements(toAdd);
130: }
131:
132: @Override
133: public void remove() throws SesameDriverException {
134:• assert current.getObject() instanceof Resource;
135: final Collection<Statement> toRemove = new ArrayList<>(next.size() + 1);
136: toRemove.add(current);
137:• if (hasNext()) {
138: toRemove.addAll(next);
139: final Statement stmt = next.iterator().next();
140: checkNodeIsResource(stmt);
141: final Resource nextNode = (Resource) stmt.getObject();
142: // Here we use the current property, so that it can also be the
143: // hasList property
144: final Statement toAdd = vf.createStatement(current.getSubject(), currentProperty,
145: nextNode, context);
146: this.next = Collections.singletonList(toAdd);
147: this.current = null;
148:
149: connector.addStatements(next);
150: } else {
151: this.next = Collections.emptyList();
152: }
153: connector.removeStatements(toRemove);
154: }
155: }