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Package: IndexSegmentExpander
IndexSegmentExpander
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| IndexSegmentExpander() |
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| checkReferenceInstantiable(VDomainModelReferenceSegment, EReference) |
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| isApplicable(VDomainModelReferenceSegment) |
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| needsToExpandLastSegment() |
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| prepareDomainObject(VDomainModelReferenceSegment, EObject) |
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| setReportService(ReportService) |
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Coverage
1: /*******************************************************************************
2: * Copyright (c) 2011-2018 EclipseSource Muenchen GmbH and others.
3: *
4: * All rights reserved. This program and the accompanying materials
5: * are made available under the terms of the Eclipse Public License 2.0
6: * which accompanies this distribution, and is available at
7: * https://www.eclipse.org/legal/epl-2.0/
8: *
9: * SPDX-License-Identifier: EPL-2.0
10: *
11: * Contributors:
12: * Lucas Koehler - initial API and implementation
13: ******************************************************************************/
14: package org.eclipse.emfforms.internal.core.services.segments.index;
15:
16: import java.util.Optional;
17:
18: import org.eclipse.core.runtime.IStatus;
19: import org.eclipse.emf.common.util.EList;
20: import org.eclipse.emf.ecore.EObject;
21: import org.eclipse.emf.ecore.EReference;
22: import org.eclipse.emf.ecore.EStructuralFeature;
23: import org.eclipse.emf.ecore.util.EcoreUtil;
24: import org.eclipse.emf.ecp.common.spi.asserts.Assert;
25: import org.eclipse.emf.ecp.view.spi.model.VDomainModelReferenceSegment;
26: import org.eclipse.emfforms.spi.common.report.AbstractReport;
27: import org.eclipse.emfforms.spi.common.report.ReportService;
28: import org.eclipse.emfforms.spi.core.services.domainexpander.EMFFormsDMRSegmentExpander;
29: import org.eclipse.emfforms.spi.core.services.domainexpander.EMFFormsExpandingFailedException;
30: import org.eclipse.emfforms.spi.view.indexsegment.model.VIndexDomainModelReferenceSegment;
31: import org.osgi.service.component.annotations.Component;
32: import org.osgi.service.component.annotations.Reference;
33:
34: /**
35: * A {@link EMFFormsDMRSegmentExpander} for {@link VIndexDomainModelReferenceSegment
36: * VIndexDomainModelReferenceSegments}.
37: *
38: * @author Lucas Koehler
39: *
40: */
41: @Component(name = "IndexSegmentExpander")
42: public class IndexSegmentExpander implements EMFFormsDMRSegmentExpander {
43: private ReportService reportService;
44:
45: /**
46: * Called by the framework to set the {@link ReportService}.
47: *
48: * @param reportService The {@link ReportService}
49: */
50: @Reference(unbind = "-")
51: protected void setReportService(ReportService reportService) {
52: this.reportService = reportService;
53:
54: }
55:
56: @Override
57: @SuppressWarnings("unchecked")
58: public Optional<EObject> prepareDomainObject(VDomainModelReferenceSegment segment, EObject domainObject)
59: throws EMFFormsExpandingFailedException {
60: Assert.create(segment).notNull();
61: Assert.create(domainObject).notNull();
62: Assert.create(segment).ofClass(VIndexDomainModelReferenceSegment.class);
63:
64: final VIndexDomainModelReferenceSegment indexSegment = (VIndexDomainModelReferenceSegment) segment;
65: final EStructuralFeature structuralFeature = domainObject.eClass()
66: .getEStructuralFeature(indexSegment.getDomainModelFeature());
67:
68:• if (structuralFeature == null) {
69: throw new EMFFormsExpandingFailedException(
70: String.format("The given domain object does not contain the segment's feature. " //$NON-NLS-1$
71: + "The segment was %1$s. The domain object was %2$s.", segment, domainObject)); //$NON-NLS-1$
72: }
73:• if (!EReference.class.isInstance(structuralFeature)) {
74: throw new EMFFormsExpandingFailedException(
75: String.format("The feature described by the given segment must be an EReference. " //$NON-NLS-1$
76: + "The segment was %1$s.", segment)); //$NON-NLS-1$
77: }
78:
79: final EReference reference = (EReference) structuralFeature;
80:
81:• if (!reference.isMany()) {
82: throw new EMFFormsExpandingFailedException(
83: String.format("The EReference described by the given index segment must be a multi reference. " //$NON-NLS-1$
84: + "The segment was %1$s.", segment)); //$NON-NLS-1$
85: }
86:
87: final int index = indexSegment.getIndex();
88: final EList<EObject> list = (EList<EObject>) domainObject.eGet(reference);
89:• if (list.size() <= index) {
90: checkReferenceInstantiable(segment, reference);
91:
92: // When index == list.size(), one element needs to be created as the index starts at 0
93: final int iterations = index - list.size() + 1;
94:• for (int i = 0; i < iterations; i++) {
95: final EObject newElement = EcoreUtil.create(reference.getEReferenceType());
96: list.add(newElement);
97: }
98:• } else if (list.get(index) == null) {
99: // The list is big enough but the element at the index must not be null
100: checkReferenceInstantiable(segment, reference);
101:
102: final EObject newElement = EcoreUtil.create(reference.getEReferenceType());
103: list.set(index, newElement);
104: }
105: final EObject target = list.get(indexSegment.getIndex());
106: return Optional.ofNullable(target);
107: }
108:
109: /**
110: * Checks that the type of the given {@link EReference} is instantiable.
111: *
112: * @param segment The source segment (only for the exception message)
113: * @param reference The {@link EReference} to check
114: * @throws EMFFormsExpandingFailedException If the given {@link EReference} is not instantiable
115: */
116: private void checkReferenceInstantiable(VDomainModelReferenceSegment segment, final EReference reference)
117: throws EMFFormsExpandingFailedException {
118:• if (reference.getEReferenceType().isAbstract() || reference.getEReferenceType().isInterface()) {
119: throw new EMFFormsExpandingFailedException(String.format(
120: "The reference type of the segment's feature is either abstract or an interface. " //$NON-NLS-1$
121: + "Therefore, no instance can be created. The segment was %1$s.", //$NON-NLS-1$
122: segment));
123: }
124: }
125:
126: @Override
127: public double isApplicable(VDomainModelReferenceSegment segment) {
128:• if (segment == null) {
129: reportService
130: .report(new AbstractReport("The given domain model reference segment was null.", IStatus.WARNING)); //$NON-NLS-1$
131: return NOT_APPLICABLE;
132: }
133:• if (VIndexDomainModelReferenceSegment.class.isInstance(segment)) {
134: return 5d;
135: }
136: return NOT_APPLICABLE;
137: }
138:
139: @Override
140: public boolean needsToExpandLastSegment() {
141: return false;
142: }
143:
144: }