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Package: EMFFormsDIRendererFactory
EMFFormsDIRendererFactory
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| EMFFormsDIRendererFactory() |
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| addEMFFormsDIRendererService(EMFFormsDIRendererService) |
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| getHighestRankingRender(VElement, ViewModelContext) |
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| getRendererInstance(VElement, ViewModelContext) |
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| getReportService() |
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| isApplicable(VElement, ViewModelContext) |
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| removeEMFFormsDIRendererService(EMFFormsDIRendererService) |
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| setReportService(ReportService) |
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| static {...} |
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Coverage
1: /*******************************************************************************
2: * Copyright (c) 2011-2015 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.spi.swt.core.di;
15:
16: import java.util.LinkedHashSet;
17: import java.util.Set;
18:
19: import org.eclipse.e4.core.contexts.ContextInjectionFactory;
20: import org.eclipse.e4.core.contexts.IEclipseContext;
21: import org.eclipse.emf.ecp.view.spi.context.ViewModelContext;
22: import org.eclipse.emf.ecp.view.spi.model.VElement;
23: import org.eclipse.emfforms.common.RankingHelper;
24: import org.eclipse.emfforms.spi.common.report.AbstractReport;
25: import org.eclipse.emfforms.spi.common.report.ReportService;
26: import org.eclipse.emfforms.spi.swt.core.AbstractSWTRenderer;
27: import org.eclipse.emfforms.spi.swt.core.EMFFormsRendererService;
28:
29: /**
30: * The {@link EMFFormsDIRendererFactory} provides renderer instances by creating an instance with help of a suitable
31: * {@link EMFFormsDIRendererService}.
32: * It then injects the renderer's required services.
33: *
34: * @author Lucas Koehler
35: *
36: */
37: public class EMFFormsDIRendererFactory implements EMFFormsRendererService<VElement> {
38:
39: private ReportService reportService;
40: private final Set<EMFFormsDIRendererService<VElement>> diRendererServices = //
41: new LinkedHashSet<EMFFormsDIRendererService<VElement>>();
42:
43: private static final RankingHelper<EMFFormsDIRendererService<VElement>> RANKING_HELPER = //
44: new RankingHelper<EMFFormsDIRendererService<VElement>>(
45: EMFFormsDIRendererService.class,
46: Double.MIN_VALUE,
47: EMFFormsRendererService.NOT_APPLICABLE);
48:
49: /**
50: * Called by the initializer to add a {@link ReportService}.
51: *
52: * @param reportService The {@link ReportService} to add
53: */
54: protected void setReportService(ReportService reportService) {
55: this.reportService = reportService;
56: }
57:
58: /**
59: * Returns the {@link ReportService}.
60: *
61: * @return The {@link ReportService}
62: */
63: protected ReportService getReportService() {
64: return reportService;
65: }
66:
67: /**
68: * Called by the initializer to add an {@link EMFFormsDIRendererService}.
69: *
70: * @param diRendererService The EMFFormsDIRendererService to add
71: */
72: protected void addEMFFormsDIRendererService(EMFFormsDIRendererService<VElement> diRendererService) {
73: diRendererServices.add(diRendererService);
74: }
75:
76: /**
77: * Called by the initializer to remove an {@link EMFFormsDIRendererService}.
78: *
79: * @param diRendererService The EMFFormsDIRendererService to remove
80: */
81: protected void removeEMFFormsDIRendererService(EMFFormsDIRendererService<VElement> diRendererService) {
82: diRendererServices.remove(diRendererService);
83: }
84:
85: private EMFFormsDIRendererService<VElement> getHighestRankingRender(
86: final VElement vElement, final ViewModelContext viewModelContext) {
87:
88: // Use a copy of the registered renderers to avoid exceptions from OSGI
89: // which can occur if renderer services are (de)registered during the iteration.
90: final Set<EMFFormsDIRendererService<VElement>> rendererServicesCopy = //
91: new LinkedHashSet<EMFFormsDIRendererService<VElement>>(diRendererServices);
92:
93: return RANKING_HELPER.getHighestRankingElement(
94: rendererServicesCopy,
95: new RankingHelper.RankTester<EMFFormsDIRendererService<VElement>>() {
96:
97: @Override
98: public double getRank(final EMFFormsDIRendererService<VElement> renderer) {
99: return renderer.isApplicable(vElement, viewModelContext);
100: }
101:
102: });
103:
104: }
105:
106: /**
107: * {@inheritDoc}
108: *
109: * @see org.eclipse.emfforms.spi.swt.core.EMFFormsRendererService#isApplicable(org.eclipse.emf.ecp.view.spi.model.VElement,
110: * org.eclipse.emf.ecp.view.spi.context.ViewModelContext)
111: */
112: @Override
113: public double isApplicable(final VElement vElement, final ViewModelContext viewModelContext) {
114:
115: final EMFFormsDIRendererService<VElement> bestRendererService = //
116: getHighestRankingRender(vElement, viewModelContext);
117:• if (bestRendererService != null) {
118: return bestRendererService.isApplicable(vElement, viewModelContext);
119: }
120: return NOT_APPLICABLE;
121: }
122:
123: /**
124: * {@inheritDoc}
125: *
126: * @see org.eclipse.emfforms.spi.swt.core.EMFFormsRendererService#getRendererInstance(org.eclipse.emf.ecp.view.spi.model.VElement,
127: * org.eclipse.emf.ecp.view.spi.context.ViewModelContext)
128: * @since 1.6
129: */
130: @SuppressWarnings("unchecked")
131: @Override
132: public AbstractSWTRenderer<VElement> getRendererInstance(VElement vElement, ViewModelContext viewModelContext) {
133:
134: final EMFFormsDIRendererService<VElement> bestRendererService = //
135: getHighestRankingRender(vElement, viewModelContext);
136:• if (bestRendererService == null) {
137: return null;
138: }
139:
140: final EMFFormsContextProvider contextProvider = viewModelContext.getService(EMFFormsContextProvider.class);
141:• if (contextProvider == null) {
142: reportService
143: .report(new AbstractReport(
144: "The given ViewModelContext does not have a EMFFormsContextProvider. Hence, no renderer instance can be created.")); //$NON-NLS-1$
145: return null;
146: }
147: final IEclipseContext eclipseContext = contextProvider.getContext();
148: final IEclipseContext childContext = eclipseContext.createChild();
149: childContext.set(ViewModelContext.class, viewModelContext);
150: childContext.set(VElement.class, vElement);
151:
152: final Class<? extends VElement> elementClass = vElement.getClass();
153: final Class<?>[] elementInterfaces = elementClass.getInterfaces();
154: for (@SuppressWarnings("rawtypes")
155:• final Class elementInterface : elementInterfaces) {
156:• if (VElement.class.isAssignableFrom(elementInterface)) {
157: childContext.set(elementInterface, elementInterface.cast(vElement));
158: }
159: }
160:
161: final Class<? extends AbstractSWTRenderer<VElement>> rendererClass = bestRendererService.getRendererClass();
162: final AbstractSWTRenderer<VElement> rendererInstance;
163: try {
164: rendererInstance = ContextInjectionFactory.make(rendererClass, childContext);
165: } catch (final org.eclipse.e4.core.di.InjectionException ex) {
166: reportService.report(new AbstractReport(ex));
167: return null;
168: }
169:
170: return rendererInstance;
171: }
172:
173: }